mirror of https://github.com/containers/podman.git
2965 lines
91 KiB
Go
2965 lines
91 KiB
Go
//go:build !remote && (linux || freebsd)
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// +build !remote
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// +build linux freebsd
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package libpod
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"math"
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"os"
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"os/user"
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"path"
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"path/filepath"
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"runtime"
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"strconv"
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"strings"
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"syscall"
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"time"
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metadata "github.com/checkpoint-restore/checkpointctl/lib"
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"github.com/checkpoint-restore/go-criu/v7/stats"
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cdi "github.com/container-orchestrated-devices/container-device-interface/pkg/cdi"
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"github.com/containers/buildah"
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"github.com/containers/buildah/pkg/chrootuser"
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"github.com/containers/buildah/pkg/overlay"
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butil "github.com/containers/buildah/util"
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"github.com/containers/common/libnetwork/etchosts"
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"github.com/containers/common/libnetwork/resolvconf"
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"github.com/containers/common/libnetwork/types"
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"github.com/containers/common/pkg/apparmor"
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"github.com/containers/common/pkg/chown"
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"github.com/containers/common/pkg/config"
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"github.com/containers/common/pkg/subscriptions"
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"github.com/containers/common/pkg/umask"
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cutil "github.com/containers/common/pkg/util"
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is "github.com/containers/image/v5/storage"
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"github.com/containers/podman/v4/libpod/define"
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"github.com/containers/podman/v4/libpod/events"
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"github.com/containers/podman/v4/pkg/annotations"
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"github.com/containers/podman/v4/pkg/checkpoint/crutils"
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"github.com/containers/podman/v4/pkg/criu"
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"github.com/containers/podman/v4/pkg/lookup"
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"github.com/containers/podman/v4/pkg/rootless"
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"github.com/containers/podman/v4/pkg/util"
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"github.com/containers/podman/v4/version"
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"github.com/containers/storage/pkg/archive"
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"github.com/containers/storage/pkg/idtools"
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"github.com/containers/storage/pkg/lockfile"
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stypes "github.com/containers/storage/types"
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securejoin "github.com/cyphar/filepath-securejoin"
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runcuser "github.com/opencontainers/runc/libcontainer/user"
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spec "github.com/opencontainers/runtime-spec/specs-go"
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"github.com/opencontainers/runtime-tools/generate"
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"github.com/opencontainers/selinux/go-selinux"
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"github.com/opencontainers/selinux/go-selinux/label"
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"github.com/sirupsen/logrus"
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"golang.org/x/sys/unix"
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)
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func parseOptionIDs(ctrMappings []idtools.IDMap, option string) ([]idtools.IDMap, error) {
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ranges := strings.Split(option, "#")
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ret := make([]idtools.IDMap, len(ranges))
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for i, m := range ranges {
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var v idtools.IDMap
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if m == "" {
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return nil, fmt.Errorf("invalid empty range for %q", option)
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}
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relative := false
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if m[0] == '@' {
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relative = true
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m = m[1:]
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}
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_, err := fmt.Sscanf(m, "%d-%d-%d", &v.ContainerID, &v.HostID, &v.Size)
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if err != nil {
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return nil, err
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}
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if v.ContainerID < 0 || v.HostID < 0 || v.Size < 1 {
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return nil, fmt.Errorf("invalid value for %q", option)
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}
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if relative {
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found := false
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for _, m := range ctrMappings {
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if v.ContainerID >= m.ContainerID && v.ContainerID < m.ContainerID+m.Size {
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v.HostID += m.HostID - m.ContainerID
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found = true
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break
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}
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}
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if !found {
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return nil, fmt.Errorf("could not find a user namespace mapping for the relative mapping %q", option)
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}
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}
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ret[i] = v
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}
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return ret, nil
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}
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func parseIDMapMountOption(idMappings stypes.IDMappingOptions, option string) ([]spec.LinuxIDMapping, []spec.LinuxIDMapping, error) {
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uidMap := idMappings.UIDMap
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gidMap := idMappings.GIDMap
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if strings.HasPrefix(option, "idmap=") {
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var err error
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options := strings.Split(strings.SplitN(option, "=", 2)[1], ";")
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for _, i := range options {
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switch {
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case strings.HasPrefix(i, "uids="):
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uidMap, err = parseOptionIDs(idMappings.UIDMap, strings.Replace(i, "uids=", "", 1))
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if err != nil {
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return nil, nil, err
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}
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case strings.HasPrefix(i, "gids="):
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gidMap, err = parseOptionIDs(idMappings.GIDMap, strings.Replace(i, "gids=", "", 1))
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if err != nil {
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return nil, nil, err
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}
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default:
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return nil, nil, fmt.Errorf("unknown option %q", i)
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}
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}
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}
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uidMappings := make([]spec.LinuxIDMapping, len(uidMap))
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gidMappings := make([]spec.LinuxIDMapping, len(gidMap))
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for i, uidmap := range uidMap {
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uidMappings[i] = spec.LinuxIDMapping{
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HostID: uint32(uidmap.HostID),
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ContainerID: uint32(uidmap.ContainerID),
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Size: uint32(uidmap.Size),
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}
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}
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for i, gidmap := range gidMap {
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gidMappings[i] = spec.LinuxIDMapping{
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HostID: uint32(gidmap.HostID),
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ContainerID: uint32(gidmap.ContainerID),
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Size: uint32(gidmap.Size),
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}
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}
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return uidMappings, gidMappings, nil
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}
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// Internal only function which returns upper and work dir from
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// overlay options.
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func getOverlayUpperAndWorkDir(options []string) (string, string, error) {
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upperDir := ""
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workDir := ""
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for _, o := range options {
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if strings.HasPrefix(o, "upperdir") {
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splitOpt := strings.SplitN(o, "=", 2)
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if len(splitOpt) > 1 {
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upperDir = splitOpt[1]
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if upperDir == "" {
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return "", "", errors.New("cannot accept empty value for upperdir")
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}
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}
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}
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if strings.HasPrefix(o, "workdir") {
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splitOpt := strings.SplitN(o, "=", 2)
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if len(splitOpt) > 1 {
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workDir = splitOpt[1]
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if workDir == "" {
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return "", "", errors.New("cannot accept empty value for workdir")
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}
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}
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}
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}
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if (upperDir != "" && workDir == "") || (upperDir == "" && workDir != "") {
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return "", "", errors.New("must specify both upperdir and workdir")
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}
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return upperDir, workDir, nil
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}
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// Generate spec for a container
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// Accepts a map of the container's dependencies
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func (c *Container) generateSpec(ctx context.Context) (s *spec.Spec, cleanupFuncRet func(), err error) {
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var safeMounts []*safeMountInfo
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// lock the thread so that the current thread will be kept alive until the mounts are used
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runtime.LockOSThread()
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cleanupFunc := func() {
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runtime.UnlockOSThread()
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for _, s := range safeMounts {
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s.Close()
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}
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}
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defer func() {
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if err != nil {
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cleanupFunc()
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}
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}()
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overrides := c.getUserOverrides()
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execUser, err := lookup.GetUserGroupInfo(c.state.Mountpoint, c.config.User, overrides)
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if err != nil {
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if cutil.StringInSlice(c.config.User, c.config.HostUsers) {
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execUser, err = lookupHostUser(c.config.User)
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}
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if err != nil {
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return nil, nil, err
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}
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}
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// NewFromSpec() is deprecated according to its comment
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// however the recommended replace just causes a nil map panic
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g := generate.NewFromSpec(c.config.Spec)
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// If the flag to mount all devices is set for a privileged container, add
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// all the devices from the host's machine into the container
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if c.config.MountAllDevices {
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systemdMode := false
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if c.config.Systemd != nil {
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systemdMode = *c.config.Systemd
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}
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if err := util.AddPrivilegedDevices(&g, systemdMode); err != nil {
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return nil, nil, err
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}
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}
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// If network namespace was requested, add it now
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if err := c.addNetworkNamespace(&g); err != nil {
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return nil, nil, err
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}
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// Apply AppArmor checks and load the default profile if needed.
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if len(c.config.Spec.Process.ApparmorProfile) > 0 {
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updatedProfile, err := apparmor.CheckProfileAndLoadDefault(c.config.Spec.Process.ApparmorProfile)
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if err != nil {
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return nil, nil, err
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}
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g.SetProcessApparmorProfile(updatedProfile)
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}
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if err := c.makeBindMounts(); err != nil {
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return nil, nil, err
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}
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if err := c.mountNotifySocket(g); err != nil {
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return nil, nil, err
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}
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// Get host UID and GID based on the container process UID and GID.
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hostUID, hostGID, err := butil.GetHostIDs(util.IDtoolsToRuntimeSpec(c.config.IDMappings.UIDMap), util.IDtoolsToRuntimeSpec(c.config.IDMappings.GIDMap), uint32(execUser.Uid), uint32(execUser.Gid))
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if err != nil {
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return nil, nil, err
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}
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// Add named volumes
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for _, namedVol := range c.config.NamedVolumes {
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volume, err := c.runtime.GetVolume(namedVol.Name)
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if err != nil {
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return nil, nil, fmt.Errorf("retrieving volume %s to add to container %s: %w", namedVol.Name, c.ID(), err)
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}
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mountPoint, err := volume.MountPoint()
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if err != nil {
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return nil, nil, err
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}
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if len(namedVol.SubPath) > 0 {
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safeMount, err := c.safeMountSubPath(mountPoint, namedVol.SubPath)
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if err != nil {
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return nil, nil, err
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}
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safeMounts = append(safeMounts, safeMount)
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mountPoint = safeMount.mountPoint
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}
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overlayFlag := false
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upperDir := ""
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workDir := ""
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for _, o := range namedVol.Options {
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if o == "O" {
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overlayFlag = true
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upperDir, workDir, err = getOverlayUpperAndWorkDir(namedVol.Options)
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if err != nil {
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return nil, nil, err
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}
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}
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}
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if overlayFlag {
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var overlayMount spec.Mount
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var overlayOpts *overlay.Options
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contentDir, err := overlay.TempDir(c.config.StaticDir, c.RootUID(), c.RootGID())
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if err != nil {
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return nil, nil, err
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}
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overlayOpts = &overlay.Options{RootUID: c.RootUID(),
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RootGID: c.RootGID(),
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UpperDirOptionFragment: upperDir,
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WorkDirOptionFragment: workDir,
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GraphOpts: c.runtime.store.GraphOptions(),
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}
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overlayMount, err = overlay.MountWithOptions(contentDir, mountPoint, namedVol.Dest, overlayOpts)
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if err != nil {
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return nil, nil, fmt.Errorf("mounting overlay failed %q: %w", mountPoint, err)
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}
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for _, o := range namedVol.Options {
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if o == "U" {
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if err := c.ChangeHostPathOwnership(mountPoint, true, int(hostUID), int(hostGID)); err != nil {
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return nil, nil, err
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}
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if err := c.ChangeHostPathOwnership(contentDir, true, int(hostUID), int(hostGID)); err != nil {
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return nil, nil, err
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}
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}
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}
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g.AddMount(overlayMount)
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} else {
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volMount := spec.Mount{
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Type: define.TypeBind,
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Source: mountPoint,
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Destination: namedVol.Dest,
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Options: namedVol.Options,
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}
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g.AddMount(volMount)
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}
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}
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// Check if the spec file mounts contain the options z, Z, U or idmap.
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// If they have z or Z, relabel the source directory and then remove the option.
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// If they have U, chown the source directory and then remove the option.
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// If they have idmap, then calculate the mappings to use in the OCI config file.
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for i := range g.Config.Mounts {
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m := &g.Config.Mounts[i]
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var options []string
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for _, o := range m.Options {
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if strings.HasPrefix(o, "subpath=") {
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subpath := strings.Split(o, "=")[1]
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safeMount, err := c.safeMountSubPath(m.Source, subpath)
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if err != nil {
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return nil, nil, err
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}
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safeMounts = append(safeMounts, safeMount)
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m.Source = safeMount.mountPoint
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continue
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}
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if o == "idmap" || strings.HasPrefix(o, "idmap=") {
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var err error
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m.UIDMappings, m.GIDMappings, err = parseIDMapMountOption(c.config.IDMappings, o)
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if err != nil {
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return nil, nil, err
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}
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continue
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}
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switch o {
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case "U":
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if m.Type == define.TypeTmpfs {
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options = append(options, []string{fmt.Sprintf("uid=%d", execUser.Uid), fmt.Sprintf("gid=%d", execUser.Gid)}...)
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} else {
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// only chown on initial creation of container
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if err := c.ChangeHostPathOwnership(m.Source, true, int(hostUID), int(hostGID)); err != nil {
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return nil, nil, err
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}
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}
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case "z":
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fallthrough
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case "Z":
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if err := c.relabel(m.Source, c.MountLabel(), label.IsShared(o)); err != nil {
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return nil, nil, err
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}
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default:
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options = append(options, o)
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}
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}
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m.Options = options
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}
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c.setProcessLabel(&g)
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c.setMountLabel(&g)
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// Add bind mounts to container
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for dstPath, srcPath := range c.state.BindMounts {
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newMount := spec.Mount{
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Type: define.TypeBind,
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Source: srcPath,
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Destination: dstPath,
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Options: bindOptions,
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}
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if c.IsReadOnly() && (dstPath != "/dev/shm" || !c.config.ReadWriteTmpfs) {
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newMount.Options = append(newMount.Options, "ro", "nosuid", "noexec", "nodev")
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}
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if dstPath == "/dev/shm" && c.state.BindMounts["/dev/shm"] == c.config.ShmDir {
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newMount.Options = append(newMount.Options, "nosuid", "noexec", "nodev")
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}
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if !MountExists(g.Mounts(), dstPath) {
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g.AddMount(newMount)
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} else {
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logrus.Infof("User mount overriding libpod mount at %q", dstPath)
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}
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}
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|
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// Add overlay volumes
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for _, overlayVol := range c.config.OverlayVolumes {
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upperDir, workDir, err := getOverlayUpperAndWorkDir(overlayVol.Options)
|
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if err != nil {
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return nil, nil, err
|
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}
|
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contentDir, err := overlay.TempDir(c.config.StaticDir, c.RootUID(), c.RootGID())
|
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if err != nil {
|
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return nil, nil, err
|
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}
|
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overlayOpts := &overlay.Options{RootUID: c.RootUID(),
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RootGID: c.RootGID(),
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UpperDirOptionFragment: upperDir,
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WorkDirOptionFragment: workDir,
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GraphOpts: c.runtime.store.GraphOptions(),
|
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}
|
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|
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overlayMount, err := overlay.MountWithOptions(contentDir, overlayVol.Source, overlayVol.Dest, overlayOpts)
|
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if err != nil {
|
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return nil, nil, fmt.Errorf("mounting overlay failed %q: %w", overlayVol.Source, err)
|
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}
|
|
|
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// Check overlay volume options
|
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for _, o := range overlayVol.Options {
|
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if o == "U" {
|
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if err := c.ChangeHostPathOwnership(overlayVol.Source, true, int(hostUID), int(hostGID)); err != nil {
|
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return nil, nil, err
|
|
}
|
|
|
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if err := c.ChangeHostPathOwnership(contentDir, true, int(hostUID), int(hostGID)); err != nil {
|
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return nil, nil, err
|
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}
|
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}
|
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}
|
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|
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g.AddMount(overlayMount)
|
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}
|
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|
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// Add image volumes as overlay mounts
|
|
for _, volume := range c.config.ImageVolumes {
|
|
// Mount the specified image.
|
|
img, _, err := c.runtime.LibimageRuntime().LookupImage(volume.Source, nil)
|
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if err != nil {
|
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return nil, nil, fmt.Errorf("creating image volume %q:%q: %w", volume.Source, volume.Dest, err)
|
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}
|
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mountPoint, err := img.Mount(ctx, nil, "")
|
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if err != nil {
|
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return nil, nil, fmt.Errorf("mounting image volume %q:%q: %w", volume.Source, volume.Dest, err)
|
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}
|
|
|
|
contentDir, err := overlay.TempDir(c.config.StaticDir, c.RootUID(), c.RootGID())
|
|
if err != nil {
|
|
return nil, nil, fmt.Errorf("failed to create TempDir in the %s directory: %w", c.config.StaticDir, err)
|
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}
|
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|
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var overlayMount spec.Mount
|
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if volume.ReadWrite {
|
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overlayMount, err = overlay.Mount(contentDir, mountPoint, volume.Dest, c.RootUID(), c.RootGID(), c.runtime.store.GraphOptions())
|
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} else {
|
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overlayMount, err = overlay.MountReadOnly(contentDir, mountPoint, volume.Dest, c.RootUID(), c.RootGID(), c.runtime.store.GraphOptions())
|
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}
|
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if err != nil {
|
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return nil, nil, fmt.Errorf("creating overlay mount for image %q failed: %w", volume.Source, err)
|
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}
|
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g.AddMount(overlayMount)
|
|
}
|
|
|
|
err = c.setHomeEnvIfNeeded()
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
if c.config.User != "" {
|
|
// User and Group must go together
|
|
g.SetProcessUID(uint32(execUser.Uid))
|
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g.SetProcessGID(uint32(execUser.Gid))
|
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g.AddProcessAdditionalGid(uint32(execUser.Gid))
|
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}
|
|
|
|
if c.config.Umask != "" {
|
|
umask, err := c.umask()
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
g.Config.Process.User.Umask = &umask
|
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}
|
|
|
|
// Add addition groups if c.config.GroupAdd is not empty
|
|
if len(c.config.Groups) > 0 {
|
|
gids, err := lookup.GetContainerGroups(c.config.Groups, c.state.Mountpoint, overrides)
|
|
if err != nil {
|
|
return nil, nil, fmt.Errorf("looking up supplemental groups for container %s: %w", c.ID(), err)
|
|
}
|
|
for _, gid := range gids {
|
|
g.AddProcessAdditionalGid(gid)
|
|
}
|
|
}
|
|
|
|
if err := c.addSystemdMounts(&g); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
// Look up and add groups the user belongs to, if a group wasn't directly specified
|
|
if !strings.Contains(c.config.User, ":") {
|
|
// the gidMappings that are present inside the container user namespace
|
|
var gidMappings []idtools.IDMap
|
|
|
|
switch {
|
|
case len(c.config.IDMappings.GIDMap) > 0:
|
|
gidMappings = c.config.IDMappings.GIDMap
|
|
case rootless.IsRootless():
|
|
// Check whether the current user namespace has enough gids available.
|
|
availableGids, err := rootless.GetAvailableGids()
|
|
if err != nil {
|
|
return nil, nil, fmt.Errorf("cannot read number of available GIDs: %w", err)
|
|
}
|
|
gidMappings = []idtools.IDMap{{
|
|
ContainerID: 0,
|
|
HostID: 0,
|
|
Size: int(availableGids),
|
|
}}
|
|
default:
|
|
gidMappings = []idtools.IDMap{{
|
|
ContainerID: 0,
|
|
HostID: 0,
|
|
Size: math.MaxInt32,
|
|
}}
|
|
}
|
|
for _, gid := range execUser.Sgids {
|
|
isGIDAvailable := false
|
|
for _, m := range gidMappings {
|
|
if gid >= m.ContainerID && gid < m.ContainerID+m.Size {
|
|
isGIDAvailable = true
|
|
break
|
|
}
|
|
}
|
|
if isGIDAvailable {
|
|
g.AddProcessAdditionalGid(uint32(gid))
|
|
} else {
|
|
logrus.Warnf("Additional gid=%d is not present in the user namespace, skip setting it", gid)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Add shared namespaces from other containers
|
|
if err := c.addSharedNamespaces(&g); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
g.SetRootPath(c.state.Mountpoint)
|
|
g.AddAnnotation("org.opencontainers.image.stopSignal", strconv.FormatUint(uint64(c.config.StopSignal), 10))
|
|
|
|
if _, exists := g.Config.Annotations[annotations.ContainerManager]; !exists {
|
|
g.AddAnnotation(annotations.ContainerManager, annotations.ContainerManagerLibpod)
|
|
}
|
|
|
|
if err := c.setCgroupsPath(&g); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
// Warning: CDI may alter g.Config in place.
|
|
if len(c.config.CDIDevices) > 0 {
|
|
registry := cdi.GetRegistry(
|
|
cdi.WithAutoRefresh(false),
|
|
)
|
|
if err := registry.Refresh(); err != nil {
|
|
logrus.Debugf("The following error was triggered when refreshing the CDI registry: %v", err)
|
|
}
|
|
_, err := registry.InjectDevices(g.Config, c.config.CDIDevices...)
|
|
if err != nil {
|
|
return nil, nil, fmt.Errorf("setting up CDI devices: %w", err)
|
|
}
|
|
}
|
|
|
|
// Mounts need to be sorted so paths will not cover other paths
|
|
mounts := sortMounts(g.Mounts())
|
|
g.ClearMounts()
|
|
|
|
for _, m := range mounts {
|
|
// We need to remove all symlinks from tmpfs mounts.
|
|
// Runc and other runtimes may choke on them.
|
|
// Easy solution: use securejoin to do a scoped evaluation of
|
|
// the links, then trim off the mount prefix.
|
|
if m.Type == define.TypeTmpfs {
|
|
finalPath, err := securejoin.SecureJoin(c.state.Mountpoint, m.Destination)
|
|
if err != nil {
|
|
return nil, nil, fmt.Errorf("resolving symlinks for mount destination %s: %w", m.Destination, err)
|
|
}
|
|
trimmedPath := strings.TrimPrefix(finalPath, strings.TrimSuffix(c.state.Mountpoint, "/"))
|
|
m.Destination = trimmedPath
|
|
}
|
|
g.AddMount(m)
|
|
}
|
|
|
|
if err := c.addRootPropagation(&g, mounts); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
// Warning: precreate hooks may alter g.Config in place.
|
|
if c.state.ExtensionStageHooks, err = c.setupOCIHooks(ctx, g.Config); err != nil {
|
|
return nil, nil, fmt.Errorf("setting up OCI Hooks: %w", err)
|
|
}
|
|
if len(c.config.EnvSecrets) > 0 {
|
|
manager, err := c.runtime.SecretsManager()
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
for name, secr := range c.config.EnvSecrets {
|
|
_, data, err := manager.LookupSecretData(secr.Name)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
g.AddProcessEnv(name, string(data))
|
|
}
|
|
}
|
|
|
|
// Pass down the LISTEN_* environment (see #10443).
|
|
for _, key := range []string{"LISTEN_PID", "LISTEN_FDS", "LISTEN_FDNAMES"} {
|
|
if val, ok := os.LookupEnv(key); ok {
|
|
// Force the PID to `1` since we cannot rely on (all
|
|
// versions of) all runtimes to do it for us.
|
|
if key == "LISTEN_PID" {
|
|
val = "1"
|
|
}
|
|
g.AddProcessEnv(key, val)
|
|
}
|
|
}
|
|
|
|
// setup rlimits
|
|
nofileSet := false
|
|
nprocSet := false
|
|
isRootless := rootless.IsRootless()
|
|
if isRootless {
|
|
if g.Config.Process != nil && g.Config.Process.OOMScoreAdj != nil {
|
|
var err error
|
|
*g.Config.Process.OOMScoreAdj, err = maybeClampOOMScoreAdj(*g.Config.Process.OOMScoreAdj)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
}
|
|
for _, rlimit := range c.config.Spec.Process.Rlimits {
|
|
if rlimit.Type == "RLIMIT_NOFILE" {
|
|
nofileSet = true
|
|
} else if rlimit.Type == "RLIMIT_NPROC" {
|
|
nprocSet = true
|
|
}
|
|
}
|
|
if !nofileSet {
|
|
max := rlimT(define.RLimitDefaultValue)
|
|
current := rlimT(define.RLimitDefaultValue)
|
|
var rlimit unix.Rlimit
|
|
if err := unix.Getrlimit(unix.RLIMIT_NOFILE, &rlimit); err != nil {
|
|
logrus.Warnf("Failed to return RLIMIT_NOFILE ulimit %q", err)
|
|
}
|
|
if rlimT(rlimit.Cur) < current {
|
|
current = rlimT(rlimit.Cur)
|
|
}
|
|
if rlimT(rlimit.Max) < max {
|
|
max = rlimT(rlimit.Max)
|
|
}
|
|
g.AddProcessRlimits("RLIMIT_NOFILE", uint64(max), uint64(current))
|
|
}
|
|
if !nprocSet {
|
|
max := rlimT(define.RLimitDefaultValue)
|
|
current := rlimT(define.RLimitDefaultValue)
|
|
var rlimit unix.Rlimit
|
|
if err := unix.Getrlimit(unix.RLIMIT_NPROC, &rlimit); err != nil {
|
|
logrus.Warnf("Failed to return RLIMIT_NPROC ulimit %q", err)
|
|
}
|
|
if rlimT(rlimit.Cur) < current {
|
|
current = rlimT(rlimit.Cur)
|
|
}
|
|
if rlimT(rlimit.Max) < max {
|
|
max = rlimT(rlimit.Max)
|
|
}
|
|
g.AddProcessRlimits("RLIMIT_NPROC", uint64(max), uint64(current))
|
|
}
|
|
}
|
|
|
|
return g.Config, cleanupFunc, nil
|
|
}
|
|
|
|
// isWorkDirSymlink returns true if resolved workdir is symlink or a chain of symlinks,
|
|
// and final resolved target is present either on volume, mount or inside of container
|
|
// otherwise it returns false. Following function is meant for internal use only and
|
|
// can change at any point of time.
|
|
func (c *Container) isWorkDirSymlink(resolvedPath string) bool {
|
|
// We cannot create workdir since explicit --workdir is
|
|
// set in config but workdir could also be a symlink.
|
|
// If it's a symlink, check if the resolved target is present in the container.
|
|
// If so, that's a valid use case: return nil.
|
|
|
|
maxSymLinks := 0
|
|
for {
|
|
// Linux only supports a chain of 40 links.
|
|
// Reference: https://github.com/torvalds/linux/blob/master/include/linux/namei.h#L13
|
|
if maxSymLinks > 40 {
|
|
break
|
|
}
|
|
resolvedSymlink, err := os.Readlink(resolvedPath)
|
|
if err != nil {
|
|
// End sym-link resolution loop.
|
|
break
|
|
}
|
|
if resolvedSymlink != "" {
|
|
_, resolvedSymlinkWorkdir, err := c.resolvePath(c.state.Mountpoint, resolvedSymlink)
|
|
if isPathOnVolume(c, resolvedSymlinkWorkdir) || isPathOnMount(c, resolvedSymlinkWorkdir) {
|
|
// Resolved symlink exists on external volume or mount
|
|
return true
|
|
}
|
|
if err != nil {
|
|
// Could not resolve path so end sym-link resolution loop.
|
|
break
|
|
}
|
|
if resolvedSymlinkWorkdir != "" {
|
|
resolvedPath = resolvedSymlinkWorkdir
|
|
_, err := os.Stat(resolvedSymlinkWorkdir)
|
|
if err == nil {
|
|
// Symlink resolved successfully and resolved path exists on container,
|
|
// this is a valid use-case so return nil.
|
|
logrus.Debugf("Workdir is a symlink with target to %q and resolved symlink exists on container", resolvedSymlink)
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
maxSymLinks++
|
|
}
|
|
return false
|
|
}
|
|
|
|
// resolveWorkDir resolves the container's workdir and, depending on the
|
|
// configuration, will create it, or error out if it does not exist.
|
|
// Note that the container must be mounted before.
|
|
func (c *Container) resolveWorkDir() error {
|
|
workdir := c.WorkingDir()
|
|
|
|
// If the specified workdir is a subdir of a volume or mount,
|
|
// we don't need to do anything. The runtime is taking care of
|
|
// that.
|
|
if isPathOnVolume(c, workdir) || isPathOnMount(c, workdir) {
|
|
logrus.Debugf("Workdir %q resolved to a volume or mount", workdir)
|
|
return nil
|
|
}
|
|
|
|
_, resolvedWorkdir, err := c.resolvePath(c.state.Mountpoint, workdir)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
logrus.Debugf("Workdir %q resolved to host path %q", workdir, resolvedWorkdir)
|
|
|
|
st, err := os.Stat(resolvedWorkdir)
|
|
if err == nil {
|
|
if !st.IsDir() {
|
|
return fmt.Errorf("workdir %q exists on container %s, but is not a directory", workdir, c.ID())
|
|
}
|
|
return nil
|
|
}
|
|
if !c.config.CreateWorkingDir {
|
|
// No need to create it (e.g., `--workdir=/foo`), so let's make sure
|
|
// the path exists on the container.
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
// If resolved Workdir path gets marked as a valid symlink,
|
|
// return nil cause this is valid use-case.
|
|
if c.isWorkDirSymlink(resolvedWorkdir) {
|
|
return nil
|
|
}
|
|
return fmt.Errorf("workdir %q does not exist on container %s", workdir, c.ID())
|
|
}
|
|
// This might be a serious error (e.g., permission), so
|
|
// we need to return the full error.
|
|
return fmt.Errorf("detecting workdir %q on container %s: %w", workdir, c.ID(), err)
|
|
}
|
|
return nil
|
|
}
|
|
if err := os.MkdirAll(resolvedWorkdir, 0755); err != nil {
|
|
if os.IsExist(err) {
|
|
return nil
|
|
}
|
|
return fmt.Errorf("creating container %s workdir: %w", c.ID(), err)
|
|
}
|
|
|
|
// Ensure container entrypoint is created (if required).
|
|
uid, gid, _, err := chrootuser.GetUser(c.state.Mountpoint, c.User())
|
|
if err != nil {
|
|
return fmt.Errorf("looking up %s inside of the container %s: %w", c.User(), c.ID(), err)
|
|
}
|
|
if err := os.Chown(resolvedWorkdir, int(uid), int(gid)); err != nil {
|
|
return fmt.Errorf("chowning container %s workdir to container root: %w", c.ID(), err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *Container) getUserOverrides() *lookup.Overrides {
|
|
var hasPasswdFile, hasGroupFile bool
|
|
overrides := lookup.Overrides{}
|
|
for _, m := range c.config.Spec.Mounts {
|
|
if m.Destination == "/etc/passwd" {
|
|
overrides.ContainerEtcPasswdPath = m.Source
|
|
hasPasswdFile = true
|
|
}
|
|
if m.Destination == "/etc/group" {
|
|
overrides.ContainerEtcGroupPath = m.Source
|
|
hasGroupFile = true
|
|
}
|
|
if m.Destination == "/etc" {
|
|
if !hasPasswdFile {
|
|
overrides.ContainerEtcPasswdPath = filepath.Join(m.Source, "passwd")
|
|
}
|
|
if !hasGroupFile {
|
|
overrides.ContainerEtcGroupPath = filepath.Join(m.Source, "group")
|
|
}
|
|
}
|
|
}
|
|
if path, ok := c.state.BindMounts["/etc/passwd"]; ok {
|
|
overrides.ContainerEtcPasswdPath = path
|
|
}
|
|
return &overrides
|
|
}
|
|
|
|
func lookupHostUser(name string) (*runcuser.ExecUser, error) {
|
|
var execUser runcuser.ExecUser
|
|
// Look up User on host
|
|
u, err := util.LookupUser(name)
|
|
if err != nil {
|
|
return &execUser, err
|
|
}
|
|
uid, err := strconv.ParseUint(u.Uid, 10, 32)
|
|
if err != nil {
|
|
return &execUser, err
|
|
}
|
|
|
|
gid, err := strconv.ParseUint(u.Gid, 10, 32)
|
|
if err != nil {
|
|
return &execUser, err
|
|
}
|
|
execUser.Uid = int(uid)
|
|
execUser.Gid = int(gid)
|
|
execUser.Home = u.HomeDir
|
|
return &execUser, nil
|
|
}
|
|
|
|
// mountNotifySocket mounts the NOTIFY_SOCKET into the container if it's set
|
|
// and if the sdnotify mode is set to container. It also sets c.notifySocket
|
|
// to avoid redundantly looking up the env variable.
|
|
func (c *Container) mountNotifySocket(g generate.Generator) error {
|
|
if c.config.SdNotifySocket == "" {
|
|
return nil
|
|
}
|
|
if c.config.SdNotifyMode != define.SdNotifyModeContainer {
|
|
return nil
|
|
}
|
|
|
|
notifyDir := filepath.Join(c.bundlePath(), "notify")
|
|
logrus.Debugf("Checking notify %q dir", notifyDir)
|
|
if err := os.MkdirAll(notifyDir, 0755); err != nil {
|
|
if !os.IsExist(err) {
|
|
return fmt.Errorf("unable to create notify %q dir: %w", notifyDir, err)
|
|
}
|
|
}
|
|
if err := label.Relabel(notifyDir, c.MountLabel(), true); err != nil {
|
|
return fmt.Errorf("relabel failed %q: %w", notifyDir, err)
|
|
}
|
|
logrus.Debugf("Add bindmount notify %q dir", notifyDir)
|
|
if _, ok := c.state.BindMounts["/run/notify"]; !ok {
|
|
c.state.BindMounts["/run/notify"] = notifyDir
|
|
}
|
|
|
|
// Set the container's notify socket to the proxy socket created by conmon
|
|
g.AddProcessEnv("NOTIFY_SOCKET", "/run/notify/notify.sock")
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *Container) addCheckpointImageMetadata(importBuilder *buildah.Builder) error {
|
|
// Get information about host environment
|
|
hostInfo, err := c.Runtime().hostInfo()
|
|
if err != nil {
|
|
return fmt.Errorf("getting host info: %v", err)
|
|
}
|
|
|
|
criuVersion, err := criu.GetCriuVersion()
|
|
if err != nil {
|
|
return fmt.Errorf("getting criu version: %v", err)
|
|
}
|
|
|
|
rootfsImageID, rootfsImageName := c.Image()
|
|
|
|
// Add image annotations with information about the container and the host.
|
|
// This information is useful to check compatibility before restoring the checkpoint
|
|
|
|
checkpointImageAnnotations := map[string]string{
|
|
define.CheckpointAnnotationName: c.config.Name,
|
|
define.CheckpointAnnotationRawImageName: c.config.RawImageName,
|
|
define.CheckpointAnnotationRootfsImageID: rootfsImageID,
|
|
define.CheckpointAnnotationRootfsImageName: rootfsImageName,
|
|
define.CheckpointAnnotationPodmanVersion: version.Version.String(),
|
|
define.CheckpointAnnotationCriuVersion: strconv.Itoa(criuVersion),
|
|
define.CheckpointAnnotationRuntimeName: hostInfo.OCIRuntime.Name,
|
|
define.CheckpointAnnotationRuntimeVersion: hostInfo.OCIRuntime.Version,
|
|
define.CheckpointAnnotationConmonVersion: hostInfo.Conmon.Version,
|
|
define.CheckpointAnnotationHostArch: hostInfo.Arch,
|
|
define.CheckpointAnnotationHostKernel: hostInfo.Kernel,
|
|
define.CheckpointAnnotationCgroupVersion: hostInfo.CgroupsVersion,
|
|
define.CheckpointAnnotationDistributionVersion: hostInfo.Distribution.Version,
|
|
define.CheckpointAnnotationDistributionName: hostInfo.Distribution.Distribution,
|
|
}
|
|
|
|
for key, value := range checkpointImageAnnotations {
|
|
importBuilder.SetAnnotation(key, value)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *Container) resolveCheckpointImageName(options *ContainerCheckpointOptions) error {
|
|
if options.CreateImage == "" {
|
|
return nil
|
|
}
|
|
|
|
// Resolve image name
|
|
resolvedImageName, err := c.runtime.LibimageRuntime().ResolveName(options.CreateImage)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
options.CreateImage = resolvedImageName
|
|
return nil
|
|
}
|
|
|
|
func (c *Container) createCheckpointImage(ctx context.Context, options ContainerCheckpointOptions) error {
|
|
if options.CreateImage == "" {
|
|
return nil
|
|
}
|
|
logrus.Debugf("Create checkpoint image %s", options.CreateImage)
|
|
|
|
// Create storage reference
|
|
imageRef, err := is.Transport.ParseStoreReference(c.runtime.store, options.CreateImage)
|
|
if err != nil {
|
|
return errors.New("failed to parse image name")
|
|
}
|
|
|
|
// Build an image scratch
|
|
builderOptions := buildah.BuilderOptions{
|
|
FromImage: "scratch",
|
|
}
|
|
importBuilder, err := buildah.NewBuilder(ctx, c.runtime.store, builderOptions)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// Clean up buildah working container
|
|
defer func() {
|
|
if err := importBuilder.Delete(); err != nil {
|
|
logrus.Errorf("Image builder delete failed: %v", err)
|
|
}
|
|
}()
|
|
|
|
if err := c.prepareCheckpointExport(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Export checkpoint into temporary tar file
|
|
tmpDir, err := os.MkdirTemp("", "checkpoint_image_")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer os.RemoveAll(tmpDir)
|
|
|
|
options.TargetFile = path.Join(tmpDir, "checkpoint.tar")
|
|
|
|
if err := c.exportCheckpoint(options); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Copy checkpoint from temporary tar file in the image
|
|
addAndCopyOptions := buildah.AddAndCopyOptions{}
|
|
if err := importBuilder.Add("", true, addAndCopyOptions, options.TargetFile); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := c.addCheckpointImageMetadata(importBuilder); err != nil {
|
|
return err
|
|
}
|
|
|
|
commitOptions := buildah.CommitOptions{
|
|
Squash: true,
|
|
SystemContext: c.runtime.imageContext,
|
|
}
|
|
|
|
// Create checkpoint image
|
|
id, _, _, err := importBuilder.Commit(ctx, imageRef, commitOptions)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
logrus.Debugf("Created checkpoint image: %s", id)
|
|
return nil
|
|
}
|
|
|
|
func (c *Container) exportCheckpoint(options ContainerCheckpointOptions) error {
|
|
if len(c.Dependencies()) == 1 {
|
|
// Check if the dependency is an infra container. If it is we can checkpoint
|
|
// the container out of the Pod.
|
|
if c.config.Pod == "" {
|
|
return errors.New("cannot export checkpoints of containers with dependencies")
|
|
}
|
|
|
|
pod, err := c.runtime.state.Pod(c.config.Pod)
|
|
if err != nil {
|
|
return fmt.Errorf("container %s is in pod %s, but pod cannot be retrieved: %w", c.ID(), c.config.Pod, err)
|
|
}
|
|
infraID, err := pod.InfraContainerID()
|
|
if err != nil {
|
|
return fmt.Errorf("cannot retrieve infra container ID for pod %s: %w", c.config.Pod, err)
|
|
}
|
|
if c.Dependencies()[0] != infraID {
|
|
return errors.New("cannot export checkpoints of containers with dependencies")
|
|
}
|
|
}
|
|
if len(c.Dependencies()) > 1 {
|
|
return errors.New("cannot export checkpoints of containers with dependencies")
|
|
}
|
|
logrus.Debugf("Exporting checkpoint image of container %q to %q", c.ID(), options.TargetFile)
|
|
|
|
includeFiles := []string{
|
|
"artifacts",
|
|
metadata.DevShmCheckpointTar,
|
|
metadata.ConfigDumpFile,
|
|
metadata.SpecDumpFile,
|
|
metadata.NetworkStatusFile,
|
|
stats.StatsDump,
|
|
}
|
|
|
|
if c.LogDriver() == define.KubernetesLogging ||
|
|
c.LogDriver() == define.JSONLogging {
|
|
includeFiles = append(includeFiles, "ctr.log")
|
|
}
|
|
if options.PreCheckPoint {
|
|
includeFiles = append(includeFiles, preCheckpointDir)
|
|
} else {
|
|
includeFiles = append(includeFiles, metadata.CheckpointDirectory)
|
|
}
|
|
// Get root file-system changes included in the checkpoint archive
|
|
var addToTarFiles []string
|
|
if !options.IgnoreRootfs {
|
|
// To correctly track deleted files, let's go through the output of 'podman diff'
|
|
rootFsChanges, err := c.runtime.GetDiff("", c.ID(), define.DiffContainer)
|
|
if err != nil {
|
|
return fmt.Errorf("exporting root file-system diff for %q: %w", c.ID(), err)
|
|
}
|
|
|
|
addToTarFiles, err := crutils.CRCreateRootFsDiffTar(&rootFsChanges, c.state.Mountpoint, c.bundlePath())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
includeFiles = append(includeFiles, addToTarFiles...)
|
|
}
|
|
|
|
// Folder containing archived volumes that will be included in the export
|
|
expVolDir := filepath.Join(c.bundlePath(), metadata.CheckpointVolumesDirectory)
|
|
|
|
// Create an archive for each volume associated with the container
|
|
if !options.IgnoreVolumes {
|
|
if err := os.MkdirAll(expVolDir, 0700); err != nil {
|
|
return fmt.Errorf("creating volumes export directory %q: %w", expVolDir, err)
|
|
}
|
|
|
|
for _, v := range c.config.NamedVolumes {
|
|
volumeTarFilePath := filepath.Join(metadata.CheckpointVolumesDirectory, v.Name+".tar")
|
|
volumeTarFileFullPath := filepath.Join(c.bundlePath(), volumeTarFilePath)
|
|
|
|
volumeTarFile, err := os.Create(volumeTarFileFullPath)
|
|
if err != nil {
|
|
return fmt.Errorf("creating %q: %w", volumeTarFileFullPath, err)
|
|
}
|
|
|
|
volume, err := c.runtime.GetVolume(v.Name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
mp, err := volume.MountPoint()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if mp == "" {
|
|
return fmt.Errorf("volume %s is not mounted, cannot export: %w", volume.Name(), define.ErrInternal)
|
|
}
|
|
|
|
input, err := archive.TarWithOptions(mp, &archive.TarOptions{
|
|
Compression: archive.Uncompressed,
|
|
IncludeSourceDir: true,
|
|
})
|
|
if err != nil {
|
|
return fmt.Errorf("reading volume directory %q: %w", v.Dest, err)
|
|
}
|
|
|
|
_, err = io.Copy(volumeTarFile, input)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
volumeTarFile.Close()
|
|
|
|
includeFiles = append(includeFiles, volumeTarFilePath)
|
|
}
|
|
}
|
|
|
|
input, err := archive.TarWithOptions(c.bundlePath(), &archive.TarOptions{
|
|
Compression: options.Compression,
|
|
IncludeSourceDir: true,
|
|
IncludeFiles: includeFiles,
|
|
})
|
|
|
|
if err != nil {
|
|
return fmt.Errorf("reading checkpoint directory %q: %w", c.ID(), err)
|
|
}
|
|
|
|
outFile, err := os.Create(options.TargetFile)
|
|
if err != nil {
|
|
return fmt.Errorf("creating checkpoint export file %q: %w", options.TargetFile, err)
|
|
}
|
|
defer outFile.Close()
|
|
|
|
if err := os.Chmod(options.TargetFile, 0600); err != nil {
|
|
return err
|
|
}
|
|
|
|
_, err = io.Copy(outFile, input)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for _, file := range addToTarFiles {
|
|
os.Remove(filepath.Join(c.bundlePath(), file))
|
|
}
|
|
|
|
if !options.IgnoreVolumes {
|
|
os.RemoveAll(expVolDir)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *Container) checkpointRestoreSupported(version int) error {
|
|
if err := criu.CheckForCriu(version); err != nil {
|
|
return err
|
|
}
|
|
if !c.ociRuntime.SupportsCheckpoint() {
|
|
return errors.New("configured runtime does not support checkpoint/restore")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (c *Container) checkpoint(ctx context.Context, options ContainerCheckpointOptions) (*define.CRIUCheckpointRestoreStatistics, int64, error) {
|
|
if err := c.checkpointRestoreSupported(criu.MinCriuVersion); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
if c.state.State != define.ContainerStateRunning {
|
|
return nil, 0, fmt.Errorf("%q is not running, cannot checkpoint: %w", c.state.State, define.ErrCtrStateInvalid)
|
|
}
|
|
|
|
if c.AutoRemove() && options.TargetFile == "" {
|
|
return nil, 0, errors.New("cannot checkpoint containers that have been started with '--rm' unless '--export' is used")
|
|
}
|
|
|
|
if err := c.resolveCheckpointImageName(&options); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
if err := crutils.CRCreateFileWithLabel(c.bundlePath(), "dump.log", c.MountLabel()); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
// Setting CheckpointLog early in case there is a failure.
|
|
c.state.CheckpointLog = path.Join(c.bundlePath(), "dump.log")
|
|
c.state.CheckpointPath = c.CheckpointPath()
|
|
|
|
runtimeCheckpointDuration, err := c.ociRuntime.CheckpointContainer(c, options)
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
// Keep the content of /dev/shm directory
|
|
if c.config.ShmDir != "" && c.state.BindMounts["/dev/shm"] == c.config.ShmDir {
|
|
shmDirTarFileFullPath := filepath.Join(c.bundlePath(), metadata.DevShmCheckpointTar)
|
|
|
|
shmDirTarFile, err := os.Create(shmDirTarFileFullPath)
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
defer shmDirTarFile.Close()
|
|
|
|
input, err := archive.TarWithOptions(c.config.ShmDir, &archive.TarOptions{
|
|
Compression: archive.Uncompressed,
|
|
IncludeSourceDir: true,
|
|
})
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
if _, err = io.Copy(shmDirTarFile, input); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
}
|
|
|
|
// Save network.status. This is needed to restore the container with
|
|
// the same IP. Currently limited to one IP address in a container
|
|
// with one interface.
|
|
// FIXME: will this break something?
|
|
if _, err := metadata.WriteJSONFile(c.getNetworkStatus(), c.bundlePath(), metadata.NetworkStatusFile); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
defer c.newContainerEvent(events.Checkpoint)
|
|
|
|
// There is a bug from criu: https://github.com/checkpoint-restore/criu/issues/116
|
|
// We have to change the symbolic link from absolute path to relative path
|
|
if options.WithPrevious {
|
|
os.Remove(path.Join(c.CheckpointPath(), "parent"))
|
|
if err := os.Symlink("../pre-checkpoint", path.Join(c.CheckpointPath(), "parent")); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
}
|
|
|
|
if options.TargetFile != "" {
|
|
if err := c.exportCheckpoint(options); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
} else {
|
|
if err := c.createCheckpointImage(ctx, options); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
}
|
|
|
|
logrus.Debugf("Checkpointed container %s", c.ID())
|
|
|
|
if !options.KeepRunning && !options.PreCheckPoint {
|
|
c.state.State = define.ContainerStateStopped
|
|
c.state.Checkpointed = true
|
|
c.state.CheckpointedTime = time.Now()
|
|
c.state.Restored = false
|
|
c.state.RestoredTime = time.Time{}
|
|
|
|
// Clean up Storage and Network
|
|
if err := c.cleanup(ctx); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
}
|
|
|
|
criuStatistics, err := func() (*define.CRIUCheckpointRestoreStatistics, error) {
|
|
if !options.PrintStats {
|
|
return nil, nil
|
|
}
|
|
statsDirectory, err := os.Open(c.bundlePath())
|
|
if err != nil {
|
|
return nil, fmt.Errorf("not able to open %q: %w", c.bundlePath(), err)
|
|
}
|
|
|
|
dumpStatistics, err := stats.CriuGetDumpStats(statsDirectory)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("displaying checkpointing statistics not possible: %w", err)
|
|
}
|
|
|
|
return &define.CRIUCheckpointRestoreStatistics{
|
|
FreezingTime: dumpStatistics.GetFreezingTime(),
|
|
FrozenTime: dumpStatistics.GetFrozenTime(),
|
|
MemdumpTime: dumpStatistics.GetMemdumpTime(),
|
|
MemwriteTime: dumpStatistics.GetMemwriteTime(),
|
|
PagesScanned: dumpStatistics.GetPagesScanned(),
|
|
PagesWritten: dumpStatistics.GetPagesWritten(),
|
|
}, nil
|
|
}()
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
if !options.Keep && !options.PreCheckPoint {
|
|
cleanup := []string{
|
|
"dump.log",
|
|
stats.StatsDump,
|
|
metadata.ConfigDumpFile,
|
|
metadata.SpecDumpFile,
|
|
}
|
|
for _, del := range cleanup {
|
|
file := filepath.Join(c.bundlePath(), del)
|
|
if err := os.Remove(file); err != nil {
|
|
logrus.Debugf("Unable to remove file %s", file)
|
|
}
|
|
}
|
|
// The file has been deleted. Do not mention it.
|
|
c.state.CheckpointLog = ""
|
|
}
|
|
|
|
c.state.FinishedTime = time.Now()
|
|
return criuStatistics, runtimeCheckpointDuration, c.save()
|
|
}
|
|
|
|
func (c *Container) generateContainerSpec() error {
|
|
// Make sure the newly created config.json exists on disk
|
|
|
|
// NewFromSpec() is deprecated according to its comment
|
|
// however the recommended replace just causes a nil map panic
|
|
g := generate.NewFromSpec(c.config.Spec)
|
|
|
|
if err := c.saveSpec(g.Config); err != nil {
|
|
return fmt.Errorf("saving imported container specification for restore failed: %w", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *Container) importCheckpointImage(ctx context.Context, imageID string) error {
|
|
img, _, err := c.Runtime().LibimageRuntime().LookupImage(imageID, nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
mountPoint, err := img.Mount(ctx, nil, "")
|
|
defer func() {
|
|
if err := c.unmount(true); err != nil {
|
|
logrus.Errorf("Failed to unmount container: %v", err)
|
|
}
|
|
}()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Import all checkpoint files except ConfigDumpFile and SpecDumpFile. We
|
|
// generate new container config files to enable to specifying a new
|
|
// container name.
|
|
checkpoint := []string{
|
|
"artifacts",
|
|
metadata.CheckpointDirectory,
|
|
metadata.CheckpointVolumesDirectory,
|
|
metadata.DevShmCheckpointTar,
|
|
metadata.RootFsDiffTar,
|
|
metadata.DeletedFilesFile,
|
|
metadata.PodOptionsFile,
|
|
metadata.PodDumpFile,
|
|
}
|
|
|
|
for _, name := range checkpoint {
|
|
src := filepath.Join(mountPoint, name)
|
|
dst := filepath.Join(c.bundlePath(), name)
|
|
if err := archive.NewDefaultArchiver().CopyWithTar(src, dst); err != nil {
|
|
logrus.Debugf("Can't import '%s' from checkpoint image", name)
|
|
}
|
|
}
|
|
|
|
return c.generateContainerSpec()
|
|
}
|
|
|
|
func (c *Container) importCheckpointTar(input string) error {
|
|
if err := crutils.CRImportCheckpointWithoutConfig(c.bundlePath(), input); err != nil {
|
|
return err
|
|
}
|
|
|
|
return c.generateContainerSpec()
|
|
}
|
|
|
|
func (c *Container) importPreCheckpoint(input string) error {
|
|
archiveFile, err := os.Open(input)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to open pre-checkpoint archive for import: %w", err)
|
|
}
|
|
|
|
defer archiveFile.Close()
|
|
|
|
err = archive.Untar(archiveFile, c.bundlePath(), nil)
|
|
if err != nil {
|
|
return fmt.Errorf("unpacking of pre-checkpoint archive %s failed: %w", input, err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (c *Container) restore(ctx context.Context, options ContainerCheckpointOptions) (criuStatistics *define.CRIUCheckpointRestoreStatistics, runtimeRestoreDuration int64, retErr error) {
|
|
minCriuVersion := func() int {
|
|
if options.Pod == "" {
|
|
return criu.MinCriuVersion
|
|
}
|
|
return criu.PodCriuVersion
|
|
}()
|
|
if err := c.checkpointRestoreSupported(minCriuVersion); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
if options.Pod != "" && !crutils.CRRuntimeSupportsPodCheckpointRestore(c.ociRuntime.Path()) {
|
|
return nil, 0, fmt.Errorf("runtime %s does not support pod restore", c.ociRuntime.Path())
|
|
}
|
|
|
|
if !c.ensureState(define.ContainerStateConfigured, define.ContainerStateExited) {
|
|
return nil, 0, fmt.Errorf("container %s is running or paused, cannot restore: %w", c.ID(), define.ErrCtrStateInvalid)
|
|
}
|
|
|
|
if options.ImportPrevious != "" {
|
|
if err := c.importPreCheckpoint(options.ImportPrevious); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
}
|
|
|
|
if options.TargetFile != "" {
|
|
if err := c.importCheckpointTar(options.TargetFile); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
} else if options.CheckpointImageID != "" {
|
|
if err := c.importCheckpointImage(ctx, options.CheckpointImageID); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
}
|
|
|
|
// Let's try to stat() CRIU's inventory file. If it does not exist, it makes
|
|
// no sense to try a restore. This is a minimal check if a checkpoint exists.
|
|
if _, err := os.Stat(filepath.Join(c.CheckpointPath(), "inventory.img")); os.IsNotExist(err) {
|
|
return nil, 0, fmt.Errorf("a complete checkpoint for this container cannot be found, cannot restore: %w", err)
|
|
}
|
|
|
|
if err := crutils.CRCreateFileWithLabel(c.bundlePath(), "restore.log", c.MountLabel()); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
// Setting RestoreLog early in case there is a failure.
|
|
c.state.RestoreLog = path.Join(c.bundlePath(), "restore.log")
|
|
c.state.CheckpointPath = c.CheckpointPath()
|
|
|
|
if options.IgnoreStaticIP || options.IgnoreStaticMAC {
|
|
networks, err := c.networks()
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
for net, opts := range networks {
|
|
if options.IgnoreStaticIP {
|
|
opts.StaticIPs = nil
|
|
}
|
|
if options.IgnoreStaticMAC {
|
|
opts.StaticMAC = nil
|
|
}
|
|
if err := c.runtime.state.NetworkModify(c, net, opts); err != nil {
|
|
return nil, 0, fmt.Errorf("failed to rewrite network config: %w", err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Read network configuration from checkpoint
|
|
var netStatus map[string]types.StatusBlock
|
|
_, err := metadata.ReadJSONFile(&netStatus, c.bundlePath(), metadata.NetworkStatusFile)
|
|
if err != nil {
|
|
logrus.Infof("Failed to unmarshal network status, cannot restore the same ip/mac: %v", err)
|
|
}
|
|
// If the restored container should get a new name, the IP address of
|
|
// the container will not be restored. This assumes that if a new name is
|
|
// specified, the container is restored multiple times.
|
|
// TODO: This implicit restoring with or without IP depending on an
|
|
// unrelated restore parameter (--name) does not seem like the
|
|
// best solution.
|
|
if err == nil && options.Name == "" && (!options.IgnoreStaticIP || !options.IgnoreStaticMAC) {
|
|
// The file with the network.status does exist. Let's restore the
|
|
// container with the same networks settings as during checkpointing.
|
|
networkOpts, err := c.networks()
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
netOpts := make(map[string]types.PerNetworkOptions, len(netStatus))
|
|
for network, perNetOpts := range networkOpts {
|
|
// unset mac and ips before we start adding the ones from the status
|
|
perNetOpts.StaticMAC = nil
|
|
perNetOpts.StaticIPs = nil
|
|
for name, netInt := range netStatus[network].Interfaces {
|
|
perNetOpts.InterfaceName = name
|
|
if !options.IgnoreStaticMAC {
|
|
perNetOpts.StaticMAC = netInt.MacAddress
|
|
}
|
|
if !options.IgnoreStaticIP {
|
|
for _, netAddress := range netInt.Subnets {
|
|
perNetOpts.StaticIPs = append(perNetOpts.StaticIPs, netAddress.IPNet.IP)
|
|
}
|
|
}
|
|
// Normally interfaces have a length of 1, only for some special cni configs we could get more.
|
|
// For now just use the first interface to get the ips this should be good enough for most cases.
|
|
break
|
|
}
|
|
netOpts[network] = perNetOpts
|
|
}
|
|
c.perNetworkOpts = netOpts
|
|
}
|
|
|
|
defer func() {
|
|
if retErr != nil {
|
|
if err := c.cleanup(ctx); err != nil {
|
|
logrus.Errorf("Cleaning up container %s: %v", c.ID(), err)
|
|
}
|
|
}
|
|
}()
|
|
|
|
if err := c.prepare(); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
// Read config
|
|
jsonPath := filepath.Join(c.bundlePath(), "config.json")
|
|
logrus.Debugf("generate.NewFromFile at %v", jsonPath)
|
|
g, err := generate.NewFromFile(jsonPath)
|
|
if err != nil {
|
|
logrus.Debugf("generate.NewFromFile failed with %v", err)
|
|
return nil, 0, err
|
|
}
|
|
|
|
// Restoring from an import means that we are doing migration
|
|
if options.TargetFile != "" || options.CheckpointImageID != "" {
|
|
g.SetRootPath(c.state.Mountpoint)
|
|
}
|
|
|
|
// We want to have the same network namespace as before.
|
|
if err := c.addNetworkNamespace(&g); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
if options.Pod != "" {
|
|
// Running in a Pod means that we have to change all namespace settings to
|
|
// the ones from the infrastructure container.
|
|
pod, err := c.runtime.LookupPod(options.Pod)
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("pod %q cannot be retrieved: %w", options.Pod, err)
|
|
}
|
|
|
|
infraContainer, err := pod.InfraContainer()
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("cannot retrieved infra container from pod %q: %w", options.Pod, err)
|
|
}
|
|
|
|
infraContainer.lock.Lock()
|
|
if err := infraContainer.syncContainer(); err != nil {
|
|
infraContainer.lock.Unlock()
|
|
return nil, 0, fmt.Errorf("syncing infrastructure container %s status: %w", infraContainer.ID(), err)
|
|
}
|
|
if infraContainer.state.State != define.ContainerStateRunning {
|
|
if err := infraContainer.initAndStart(ctx); err != nil {
|
|
infraContainer.lock.Unlock()
|
|
return nil, 0, fmt.Errorf("starting infrastructure container %s status: %w", infraContainer.ID(), err)
|
|
}
|
|
}
|
|
infraContainer.lock.Unlock()
|
|
|
|
if c.config.IPCNsCtr != "" {
|
|
nsPath, err := infraContainer.namespacePath(IPCNS)
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("cannot retrieve IPC namespace path for Pod %q: %w", options.Pod, err)
|
|
}
|
|
if err := g.AddOrReplaceLinuxNamespace(string(spec.IPCNamespace), nsPath); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
}
|
|
|
|
if c.config.NetNsCtr != "" {
|
|
nsPath, err := infraContainer.namespacePath(NetNS)
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("cannot retrieve network namespace path for Pod %q: %w", options.Pod, err)
|
|
}
|
|
if err := g.AddOrReplaceLinuxNamespace(string(spec.NetworkNamespace), nsPath); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
}
|
|
|
|
if c.config.PIDNsCtr != "" {
|
|
nsPath, err := infraContainer.namespacePath(PIDNS)
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("cannot retrieve PID namespace path for Pod %q: %w", options.Pod, err)
|
|
}
|
|
if err := g.AddOrReplaceLinuxNamespace(string(spec.PIDNamespace), nsPath); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
}
|
|
|
|
if c.config.UTSNsCtr != "" {
|
|
nsPath, err := infraContainer.namespacePath(UTSNS)
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("cannot retrieve UTS namespace path for Pod %q: %w", options.Pod, err)
|
|
}
|
|
if err := g.AddOrReplaceLinuxNamespace(string(spec.UTSNamespace), nsPath); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
}
|
|
|
|
if c.config.CgroupNsCtr != "" {
|
|
nsPath, err := infraContainer.namespacePath(CgroupNS)
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("cannot retrieve Cgroup namespace path for Pod %q: %w", options.Pod, err)
|
|
}
|
|
if err := g.AddOrReplaceLinuxNamespace(string(spec.CgroupNamespace), nsPath); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
}
|
|
}
|
|
|
|
if err := c.makeBindMounts(); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
if options.TargetFile != "" || options.CheckpointImageID != "" {
|
|
for dstPath, srcPath := range c.state.BindMounts {
|
|
newMount := spec.Mount{
|
|
Type: define.TypeBind,
|
|
Source: srcPath,
|
|
Destination: dstPath,
|
|
Options: []string{define.TypeBind, "private"},
|
|
}
|
|
if c.IsReadOnly() && (dstPath != "/dev/shm" || !c.config.ReadWriteTmpfs) {
|
|
newMount.Options = append(newMount.Options, "ro", "nosuid", "noexec", "nodev")
|
|
}
|
|
if dstPath == "/dev/shm" && c.state.BindMounts["/dev/shm"] == c.config.ShmDir {
|
|
newMount.Options = append(newMount.Options, "nosuid", "noexec", "nodev")
|
|
}
|
|
if !MountExists(g.Mounts(), dstPath) {
|
|
g.AddMount(newMount)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Restore /dev/shm content
|
|
if c.config.ShmDir != "" && c.state.BindMounts["/dev/shm"] == c.config.ShmDir {
|
|
shmDirTarFileFullPath := filepath.Join(c.bundlePath(), metadata.DevShmCheckpointTar)
|
|
if _, err := os.Stat(shmDirTarFileFullPath); err != nil {
|
|
logrus.Debug("Container checkpoint doesn't contain dev/shm: ", err.Error())
|
|
} else {
|
|
shmDirTarFile, err := os.Open(shmDirTarFileFullPath)
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
defer shmDirTarFile.Close()
|
|
|
|
if err := archive.UntarUncompressed(shmDirTarFile, c.config.ShmDir, nil); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
}
|
|
}
|
|
|
|
// Cleanup for a working restore.
|
|
if err := c.removeConmonFiles(); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
// Save the OCI spec to disk
|
|
if err := c.saveSpec(g.Config); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
// When restoring from an imported archive, allow restoring the content of volumes.
|
|
// Volumes are created in setupContainer()
|
|
if !options.IgnoreVolumes && (options.TargetFile != "" || options.CheckpointImageID != "") {
|
|
for _, v := range c.config.NamedVolumes {
|
|
volumeFilePath := filepath.Join(c.bundlePath(), metadata.CheckpointVolumesDirectory, v.Name+".tar")
|
|
|
|
volumeFile, err := os.Open(volumeFilePath)
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("failed to open volume file %s: %w", volumeFilePath, err)
|
|
}
|
|
defer volumeFile.Close()
|
|
|
|
volume, err := c.runtime.GetVolume(v.Name)
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("failed to retrieve volume %s: %w", v.Name, err)
|
|
}
|
|
|
|
mountPoint, err := volume.MountPoint()
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
if mountPoint == "" {
|
|
return nil, 0, fmt.Errorf("unable to import volume %s as it is not mounted: %w", volume.Name(), err)
|
|
}
|
|
if err := archive.UntarUncompressed(volumeFile, mountPoint, nil); err != nil {
|
|
return nil, 0, fmt.Errorf("failed to extract volume %s to %s: %w", volumeFilePath, mountPoint, err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Before actually restarting the container, apply the root file-system changes
|
|
if !options.IgnoreRootfs {
|
|
if err := crutils.CRApplyRootFsDiffTar(c.bundlePath(), c.state.Mountpoint); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
if err := crutils.CRRemoveDeletedFiles(c.ID(), c.bundlePath(), c.state.Mountpoint); err != nil {
|
|
return nil, 0, err
|
|
}
|
|
}
|
|
|
|
runtimeRestoreDuration, err = c.ociRuntime.CreateContainer(c, &options)
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
criuStatistics, err = func() (*define.CRIUCheckpointRestoreStatistics, error) {
|
|
if !options.PrintStats {
|
|
return nil, nil
|
|
}
|
|
statsDirectory, err := os.Open(c.bundlePath())
|
|
if err != nil {
|
|
return nil, fmt.Errorf("not able to open %q: %w", c.bundlePath(), err)
|
|
}
|
|
|
|
restoreStatistics, err := stats.CriuGetRestoreStats(statsDirectory)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("displaying restore statistics not possible: %w", err)
|
|
}
|
|
|
|
return &define.CRIUCheckpointRestoreStatistics{
|
|
PagesCompared: restoreStatistics.GetPagesCompared(),
|
|
PagesSkippedCow: restoreStatistics.GetPagesSkippedCow(),
|
|
ForkingTime: restoreStatistics.GetForkingTime(),
|
|
RestoreTime: restoreStatistics.GetRestoreTime(),
|
|
PagesRestored: restoreStatistics.GetPagesRestored(),
|
|
}, nil
|
|
}()
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
logrus.Debugf("Restored container %s", c.ID())
|
|
|
|
c.state.State = define.ContainerStateRunning
|
|
c.state.Checkpointed = false
|
|
c.state.Restored = true
|
|
c.state.CheckpointedTime = time.Time{}
|
|
c.state.RestoredTime = time.Now()
|
|
|
|
if !options.Keep {
|
|
// Delete all checkpoint related files. At this point, in theory, all files
|
|
// should exist. Still ignoring errors for now as the container should be
|
|
// restored and running. Not erroring out just because some cleanup operation
|
|
// failed. Starting with the checkpoint directory
|
|
err = os.RemoveAll(c.CheckpointPath())
|
|
if err != nil {
|
|
logrus.Debugf("Non-fatal: removal of checkpoint directory (%s) failed: %v", c.CheckpointPath(), err)
|
|
}
|
|
c.state.CheckpointPath = ""
|
|
err = os.RemoveAll(c.PreCheckPointPath())
|
|
if err != nil {
|
|
logrus.Debugf("Non-fatal: removal of pre-checkpoint directory (%s) failed: %v", c.PreCheckPointPath(), err)
|
|
}
|
|
err = os.RemoveAll(c.CheckpointVolumesPath())
|
|
if err != nil {
|
|
logrus.Debugf("Non-fatal: removal of checkpoint volumes directory (%s) failed: %v", c.CheckpointVolumesPath(), err)
|
|
}
|
|
cleanup := [...]string{
|
|
"restore.log",
|
|
"dump.log",
|
|
stats.StatsDump,
|
|
stats.StatsRestore,
|
|
metadata.DevShmCheckpointTar,
|
|
metadata.NetworkStatusFile,
|
|
metadata.RootFsDiffTar,
|
|
metadata.DeletedFilesFile,
|
|
}
|
|
for _, del := range cleanup {
|
|
file := filepath.Join(c.bundlePath(), del)
|
|
err = os.Remove(file)
|
|
if err != nil {
|
|
logrus.Debugf("Non-fatal: removal of checkpoint file (%s) failed: %v", file, err)
|
|
}
|
|
}
|
|
c.state.CheckpointLog = ""
|
|
c.state.RestoreLog = ""
|
|
}
|
|
|
|
return criuStatistics, runtimeRestoreDuration, c.save()
|
|
}
|
|
|
|
// Retrieves a container's "root" net namespace container dependency.
|
|
func (c *Container) getRootNetNsDepCtr() (depCtr *Container, err error) {
|
|
containersVisited := map[string]int{c.config.ID: 1}
|
|
nextCtr := c.config.NetNsCtr
|
|
for nextCtr != "" {
|
|
// Make sure we aren't in a loop
|
|
if _, visited := containersVisited[nextCtr]; visited {
|
|
return nil, errors.New("loop encountered while determining net namespace container")
|
|
}
|
|
containersVisited[nextCtr] = 1
|
|
|
|
depCtr, err = c.runtime.state.Container(nextCtr)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("fetching dependency %s of container %s: %w", c.config.NetNsCtr, c.ID(), err)
|
|
}
|
|
// This should never happen without an error
|
|
if depCtr == nil {
|
|
break
|
|
}
|
|
nextCtr = depCtr.config.NetNsCtr
|
|
}
|
|
|
|
if depCtr == nil {
|
|
return nil, errors.New("unexpected error depCtr is nil without reported error from runtime state")
|
|
}
|
|
return depCtr, nil
|
|
}
|
|
|
|
// Ensure standard bind mounts are mounted into all root directories (including chroot directories)
|
|
func (c *Container) mountIntoRootDirs(mountName string, mountPath string) error {
|
|
c.state.BindMounts[mountName] = mountPath
|
|
|
|
for _, chrootDir := range c.config.ChrootDirs {
|
|
c.state.BindMounts[filepath.Join(chrootDir, mountName)] = mountPath
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Make standard bind mounts to include in the container
|
|
func (c *Container) makeBindMounts() error {
|
|
if err := os.Chown(c.state.RunDir, c.RootUID(), c.RootGID()); err != nil {
|
|
return fmt.Errorf("cannot chown run directory: %w", err)
|
|
}
|
|
|
|
if c.state.BindMounts == nil {
|
|
c.state.BindMounts = make(map[string]string)
|
|
}
|
|
netDisabled, err := c.NetworkDisabled()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if !netDisabled {
|
|
// If /etc/resolv.conf and /etc/hosts exist, delete them so we
|
|
// will recreate. Only do this if we aren't sharing them with
|
|
// another container.
|
|
if c.config.NetNsCtr == "" {
|
|
if resolvePath, ok := c.state.BindMounts[resolvconf.DefaultResolvConf]; ok {
|
|
if err := os.Remove(resolvePath); err != nil && !os.IsNotExist(err) {
|
|
return fmt.Errorf("container %s: %w", c.ID(), err)
|
|
}
|
|
delete(c.state.BindMounts, resolvconf.DefaultResolvConf)
|
|
}
|
|
if hostsPath, ok := c.state.BindMounts[config.DefaultHostsFile]; ok {
|
|
if err := os.Remove(hostsPath); err != nil && !os.IsNotExist(err) {
|
|
return fmt.Errorf("container %s: %w", c.ID(), err)
|
|
}
|
|
delete(c.state.BindMounts, config.DefaultHostsFile)
|
|
}
|
|
}
|
|
|
|
if c.config.NetNsCtr != "" && (!c.config.UseImageResolvConf || !c.config.UseImageHosts) {
|
|
// We share a net namespace.
|
|
// We want /etc/resolv.conf and /etc/hosts from the
|
|
// other container. Unless we're not creating both of
|
|
// them.
|
|
depCtr, err := c.getRootNetNsDepCtr()
|
|
if err != nil {
|
|
return fmt.Errorf("fetching network namespace dependency container for container %s: %w", c.ID(), err)
|
|
}
|
|
|
|
// We need that container's bind mounts
|
|
bindMounts, err := depCtr.BindMounts()
|
|
if err != nil {
|
|
return fmt.Errorf("fetching bind mounts from dependency %s of container %s: %w", depCtr.ID(), c.ID(), err)
|
|
}
|
|
|
|
// The other container may not have a resolv.conf or /etc/hosts
|
|
// If it doesn't, don't copy them
|
|
resolvPath, exists := bindMounts[resolvconf.DefaultResolvConf]
|
|
if !c.config.UseImageResolvConf && exists {
|
|
err := c.mountIntoRootDirs(resolvconf.DefaultResolvConf, resolvPath)
|
|
|
|
if err != nil {
|
|
return fmt.Errorf("assigning mounts to container %s: %w", c.ID(), err)
|
|
}
|
|
}
|
|
|
|
// check if dependency container has an /etc/hosts file.
|
|
// It may not have one, so only use it if it does.
|
|
hostsPath, exists := bindMounts[config.DefaultHostsFile]
|
|
if !c.config.UseImageHosts && exists {
|
|
// we cannot use the dependency container lock due ABBA deadlocks in cleanup()
|
|
lock, err := lockfile.GetLockFile(hostsPath)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to lock hosts file: %w", err)
|
|
}
|
|
lock.Lock()
|
|
|
|
// add the newly added container to the hosts file
|
|
// we always use 127.0.0.1 as ip since they have the same netns
|
|
err = etchosts.Add(hostsPath, getLocalhostHostEntry(c))
|
|
lock.Unlock()
|
|
if err != nil {
|
|
return fmt.Errorf("creating hosts file for container %s which depends on container %s: %w", c.ID(), depCtr.ID(), err)
|
|
}
|
|
|
|
// finally, save it in the new container
|
|
err = c.mountIntoRootDirs(config.DefaultHostsFile, hostsPath)
|
|
if err != nil {
|
|
return fmt.Errorf("assigning mounts to container %s: %w", c.ID(), err)
|
|
}
|
|
}
|
|
|
|
if !hasCurrentUserMapped(c) {
|
|
if err := makeAccessible(resolvPath, c.RootUID(), c.RootGID()); err != nil {
|
|
return err
|
|
}
|
|
if err := makeAccessible(hostsPath, c.RootUID(), c.RootGID()); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
} else {
|
|
if !c.config.UseImageResolvConf {
|
|
if err := c.createResolvConf(); err != nil {
|
|
return fmt.Errorf("creating resolv.conf for container %s: %w", c.ID(), err)
|
|
}
|
|
}
|
|
|
|
if !c.config.UseImageHosts {
|
|
if err := c.createHostsFile(); err != nil {
|
|
return fmt.Errorf("creating hosts file for container %s: %w", c.ID(), err)
|
|
}
|
|
}
|
|
}
|
|
|
|
if c.state.BindMounts[config.DefaultHostsFile] != "" {
|
|
if err := c.relabel(c.state.BindMounts[config.DefaultHostsFile], c.config.MountLabel, true); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if c.state.BindMounts[resolvconf.DefaultResolvConf] != "" {
|
|
if err := c.relabel(c.state.BindMounts[resolvconf.DefaultResolvConf], c.config.MountLabel, true); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
} else if !c.config.UseImageHosts && c.state.BindMounts[config.DefaultHostsFile] == "" {
|
|
if err := c.createHostsFile(); err != nil {
|
|
return fmt.Errorf("creating hosts file for container %s: %w", c.ID(), err)
|
|
}
|
|
}
|
|
|
|
if c.config.ShmDir != "" {
|
|
// If ShmDir has a value SHM is always added when we mount the container
|
|
c.state.BindMounts["/dev/shm"] = c.config.ShmDir
|
|
}
|
|
|
|
if c.config.Passwd == nil || *c.config.Passwd {
|
|
newPasswd, newGroup, err := c.generatePasswdAndGroup()
|
|
if err != nil {
|
|
return fmt.Errorf("creating temporary passwd file for container %s: %w", c.ID(), err)
|
|
}
|
|
if newPasswd != "" {
|
|
// Make /etc/passwd
|
|
// If it already exists, delete so we can recreate
|
|
delete(c.state.BindMounts, "/etc/passwd")
|
|
c.state.BindMounts["/etc/passwd"] = newPasswd
|
|
}
|
|
if newGroup != "" {
|
|
// Make /etc/group
|
|
// If it already exists, delete so we can recreate
|
|
delete(c.state.BindMounts, "/etc/group")
|
|
c.state.BindMounts["/etc/group"] = newGroup
|
|
}
|
|
}
|
|
|
|
runPath, err := c.getPlatformRunPath()
|
|
if err != nil {
|
|
return fmt.Errorf("cannot determine run directory for container: %w", err)
|
|
}
|
|
containerenvPath := filepath.Join(runPath, ".containerenv")
|
|
|
|
_, hasRunContainerenv := c.state.BindMounts[containerenvPath]
|
|
if !hasRunContainerenv {
|
|
Loop:
|
|
// check in the spec mounts
|
|
for _, m := range c.config.Spec.Mounts {
|
|
switch {
|
|
case m.Destination == containerenvPath:
|
|
hasRunContainerenv = true
|
|
break Loop
|
|
case m.Destination == runPath && m.Type != define.TypeTmpfs:
|
|
hasRunContainerenv = true
|
|
break Loop
|
|
}
|
|
}
|
|
}
|
|
|
|
// Make .containerenv if it does not exist
|
|
if !hasRunContainerenv {
|
|
containerenv := c.runtime.graphRootMountedFlag(c.config.Spec.Mounts)
|
|
isRootless := 0
|
|
if rootless.IsRootless() {
|
|
isRootless = 1
|
|
}
|
|
imageID, imageName := c.Image()
|
|
|
|
if c.Privileged() {
|
|
// Populate the .containerenv with container information
|
|
containerenv = fmt.Sprintf(`engine="podman-%s"
|
|
name=%q
|
|
id=%q
|
|
image=%q
|
|
imageid=%q
|
|
rootless=%d
|
|
%s`, version.Version.String(), c.Name(), c.ID(), imageName, imageID, isRootless, containerenv)
|
|
}
|
|
containerenvHostPath, err := c.writeStringToRundir(".containerenv", containerenv)
|
|
if err != nil {
|
|
return fmt.Errorf("creating containerenv file for container %s: %w", c.ID(), err)
|
|
}
|
|
c.state.BindMounts[containerenvPath] = containerenvHostPath
|
|
}
|
|
|
|
// Add Subscription Mounts
|
|
subscriptionMounts := subscriptions.MountsWithUIDGID(c.config.MountLabel, c.state.RunDir, c.runtime.config.Containers.DefaultMountsFile, c.state.Mountpoint, c.RootUID(), c.RootGID(), rootless.IsRootless(), false)
|
|
for _, mount := range subscriptionMounts {
|
|
if _, ok := c.state.BindMounts[mount.Destination]; !ok {
|
|
c.state.BindMounts[mount.Destination] = mount.Source
|
|
}
|
|
}
|
|
|
|
// Secrets are mounted by getting the secret data from the secrets manager,
|
|
// copying the data into the container's static dir,
|
|
// then mounting the copied dir into /run/secrets.
|
|
// The secrets mounting must come after subscription mounts, since subscription mounts
|
|
// creates the /run/secrets dir in the container where we mount as well.
|
|
if len(c.Secrets()) > 0 {
|
|
// create /run/secrets if subscriptions did not create
|
|
if err := c.createSecretMountDir(runPath); err != nil {
|
|
return fmt.Errorf("creating secrets mount: %w", err)
|
|
}
|
|
for _, secret := range c.Secrets() {
|
|
secretFileName := secret.Name
|
|
base := filepath.Join(runPath, "secrets")
|
|
if secret.Target != "" {
|
|
secretFileName = secret.Target
|
|
// If absolute path for target given remove base.
|
|
if filepath.IsAbs(secretFileName) {
|
|
base = ""
|
|
}
|
|
}
|
|
src := filepath.Join(c.config.SecretsPath, secret.Name)
|
|
dest := filepath.Join(base, secretFileName)
|
|
c.state.BindMounts[dest] = src
|
|
}
|
|
}
|
|
|
|
return c.makePlatformBindMounts()
|
|
}
|
|
|
|
// createResolvConf create the resolv.conf file and bind mount it
|
|
func (c *Container) createResolvConf() error {
|
|
destPath := filepath.Join(c.state.RunDir, "resolv.conf")
|
|
f, err := os.Create(destPath)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
f.Close()
|
|
return c.bindMountRootFile(destPath, resolvconf.DefaultResolvConf)
|
|
}
|
|
|
|
// addResolvConf add resolv.conf entries
|
|
func (c *Container) addResolvConf() error {
|
|
destPath, ok := c.state.BindMounts[resolvconf.DefaultResolvConf]
|
|
if !ok {
|
|
// no resolv.conf mount, do nothing
|
|
return nil
|
|
}
|
|
|
|
var (
|
|
networkNameServers []string
|
|
networkSearchDomains []string
|
|
)
|
|
|
|
netStatus := c.getNetworkStatus()
|
|
for _, status := range netStatus {
|
|
if status.DNSServerIPs != nil {
|
|
for _, nsIP := range status.DNSServerIPs {
|
|
networkNameServers = append(networkNameServers, nsIP.String())
|
|
}
|
|
logrus.Debugf("Adding nameserver(s) from network status of '%q'", status.DNSServerIPs)
|
|
}
|
|
if status.DNSSearchDomains != nil {
|
|
networkSearchDomains = append(networkSearchDomains, status.DNSSearchDomains...)
|
|
logrus.Debugf("Adding search domain(s) from network status of '%q'", status.DNSSearchDomains)
|
|
}
|
|
}
|
|
|
|
ipv6 := c.checkForIPv6(netStatus)
|
|
|
|
networkBackend := c.runtime.config.Network.NetworkBackend
|
|
nameservers := make([]string, 0, len(c.runtime.config.Containers.DNSServers)+len(c.config.DNSServer))
|
|
|
|
// If NetworkBackend is `netavark` do not populate `/etc/resolv.conf`
|
|
// with custom dns server since after https://github.com/containers/netavark/pull/452
|
|
// netavark will always set required `nameservers` in StatusBlock and libpod
|
|
// will correctly populate `networkNameServers`. Also see https://github.com/containers/podman/issues/16172
|
|
|
|
// Exception: Populate `/etc/resolv.conf` if container is not connected to any network
|
|
// with dns enabled then we do not get any nameservers back.
|
|
if networkBackend != string(types.Netavark) || len(networkNameServers) == 0 {
|
|
nameservers = append(nameservers, c.runtime.config.Containers.DNSServers...)
|
|
for _, ip := range c.config.DNSServer {
|
|
nameservers = append(nameservers, ip.String())
|
|
}
|
|
}
|
|
// If the user provided dns, it trumps all; then dns masq; then resolv.conf
|
|
keepHostServers := false
|
|
if len(nameservers) == 0 {
|
|
// when no network name servers or not netavark use host servers
|
|
// for aardvark dns we only want our single server in there
|
|
if len(networkNameServers) == 0 || networkBackend != string(types.Netavark) {
|
|
keepHostServers = true
|
|
}
|
|
// first add the nameservers from the networks status
|
|
nameservers = networkNameServers
|
|
|
|
// slirp4netns has a built in DNS forwarder.
|
|
nameservers = c.addSlirp4netnsDNS(nameservers)
|
|
}
|
|
|
|
// Set DNS search domains
|
|
search := networkSearchDomains
|
|
|
|
if len(c.config.DNSSearch) > 0 || len(c.runtime.config.Containers.DNSSearches) > 0 {
|
|
customSearch := make([]string, 0, len(c.config.DNSSearch)+len(c.runtime.config.Containers.DNSSearches))
|
|
customSearch = append(customSearch, c.runtime.config.Containers.DNSSearches...)
|
|
customSearch = append(customSearch, c.config.DNSSearch...)
|
|
search = customSearch
|
|
}
|
|
|
|
options := make([]string, 0, len(c.config.DNSOption)+len(c.runtime.config.Containers.DNSOptions))
|
|
options = append(options, c.runtime.config.Containers.DNSOptions...)
|
|
options = append(options, c.config.DNSOption...)
|
|
|
|
var namespaces []spec.LinuxNamespace
|
|
if c.config.Spec.Linux != nil {
|
|
namespaces = c.config.Spec.Linux.Namespaces
|
|
}
|
|
|
|
if err := resolvconf.New(&resolvconf.Params{
|
|
IPv6Enabled: ipv6,
|
|
KeepHostServers: keepHostServers,
|
|
Nameservers: nameservers,
|
|
Namespaces: namespaces,
|
|
Options: options,
|
|
Path: destPath,
|
|
Searches: search,
|
|
}); err != nil {
|
|
return fmt.Errorf("building resolv.conf for container %s: %w", c.ID(), err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Check if a container uses IPv6.
|
|
func (c *Container) checkForIPv6(netStatus map[string]types.StatusBlock) bool {
|
|
for _, status := range netStatus {
|
|
for _, netInt := range status.Interfaces {
|
|
for _, netAddress := range netInt.Subnets {
|
|
// Note: only using To16() does not work since it also returns a valid ip for ipv4
|
|
if netAddress.IPNet.IP.To4() == nil && netAddress.IPNet.IP.To16() != nil {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return c.isSlirp4netnsIPv6()
|
|
}
|
|
|
|
// Add a new nameserver to the container's resolv.conf, ensuring that it is the
|
|
// first nameserver present.
|
|
// Usable only with running containers.
|
|
func (c *Container) addNameserver(ips []string) error {
|
|
// Take no action if container is not running.
|
|
if !c.ensureState(define.ContainerStateRunning, define.ContainerStateCreated) {
|
|
return nil
|
|
}
|
|
|
|
// Do we have a resolv.conf at all?
|
|
path, ok := c.state.BindMounts[resolvconf.DefaultResolvConf]
|
|
if !ok {
|
|
return nil
|
|
}
|
|
|
|
if err := resolvconf.Add(path, ips); err != nil {
|
|
return fmt.Errorf("adding new nameserver to container %s resolv.conf: %w", c.ID(), err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Remove an entry from the existing resolv.conf of the container.
|
|
// Usable only with running containers.
|
|
func (c *Container) removeNameserver(ips []string) error {
|
|
// Take no action if container is not running.
|
|
if !c.ensureState(define.ContainerStateRunning, define.ContainerStateCreated) {
|
|
return nil
|
|
}
|
|
|
|
// Do we have a resolv.conf at all?
|
|
path, ok := c.state.BindMounts[resolvconf.DefaultResolvConf]
|
|
if !ok {
|
|
return nil
|
|
}
|
|
|
|
if err := resolvconf.Remove(path, ips); err != nil {
|
|
return fmt.Errorf("removing nameservers from container %s resolv.conf: %w", c.ID(), err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func getLocalhostHostEntry(c *Container) etchosts.HostEntries {
|
|
return etchosts.HostEntries{{IP: "127.0.0.1", Names: []string{c.Hostname(), c.config.Name}}}
|
|
}
|
|
|
|
// getHostsEntries returns the container ip host entries for the correct netmode
|
|
func (c *Container) getHostsEntries() (etchosts.HostEntries, error) {
|
|
var entries etchosts.HostEntries
|
|
names := []string{c.Hostname(), c.config.Name}
|
|
switch {
|
|
case c.config.NetMode.IsBridge():
|
|
entries = etchosts.GetNetworkHostEntries(c.state.NetworkStatus, names...)
|
|
case c.config.NetMode.IsPasta():
|
|
ip, err := getPastaIP(c.state)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
entries = etchosts.HostEntries{{IP: ip.String(), Names: names}}
|
|
case c.config.NetMode.IsSlirp4netns():
|
|
ip, err := getSlirp4netnsIP(c.slirp4netnsSubnet)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
entries = etchosts.HostEntries{{IP: ip.String(), Names: names}}
|
|
default:
|
|
if c.hasNetNone() {
|
|
entries = etchosts.HostEntries{{IP: "127.0.0.1", Names: names}}
|
|
}
|
|
}
|
|
return entries, nil
|
|
}
|
|
|
|
func (c *Container) createHostsFile() error {
|
|
targetFile := filepath.Join(c.state.RunDir, "hosts")
|
|
f, err := os.Create(targetFile)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
f.Close()
|
|
return c.bindMountRootFile(targetFile, config.DefaultHostsFile)
|
|
}
|
|
|
|
func (c *Container) addHosts() error {
|
|
targetFile, ok := c.state.BindMounts[config.DefaultHostsFile]
|
|
if !ok {
|
|
// no host file nothing to do
|
|
return nil
|
|
}
|
|
containerIPsEntries, err := c.getHostsEntries()
|
|
if err != nil {
|
|
return fmt.Errorf("failed to get container ip host entries: %w", err)
|
|
}
|
|
baseHostFile, err := etchosts.GetBaseHostFile(c.runtime.config.Containers.BaseHostsFile, c.state.Mountpoint)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return etchosts.New(&etchosts.Params{
|
|
BaseFile: baseHostFile,
|
|
ExtraHosts: c.config.HostAdd,
|
|
ContainerIPs: containerIPsEntries,
|
|
HostContainersInternalIP: etchosts.GetHostContainersInternalIP(c.runtime.config, c.state.NetworkStatus, c.runtime.network),
|
|
TargetFile: targetFile,
|
|
})
|
|
}
|
|
|
|
// bindMountRootFile will chown and relabel the source file to make it usable in the container.
|
|
// It will also add the path to the container bind mount map.
|
|
// source is the path on the host, dest is the path in the container.
|
|
func (c *Container) bindMountRootFile(source, dest string) error {
|
|
if err := os.Chown(source, c.RootUID(), c.RootGID()); err != nil {
|
|
return err
|
|
}
|
|
if err := label.Relabel(source, c.MountLabel(), false); err != nil {
|
|
return err
|
|
}
|
|
|
|
return c.mountIntoRootDirs(dest, source)
|
|
}
|
|
|
|
// generateGroupEntry generates an entry or entries into /etc/group as
|
|
// required by container configuration.
|
|
// Generally speaking, we will make an entry under two circumstances:
|
|
// 1. The container is started as a specific user:group, and that group is both
|
|
// numeric, and does not already exist in /etc/group.
|
|
// 2. It is requested that Libpod add the group that launched Podman to
|
|
// /etc/group via AddCurrentUserPasswdEntry (though this does not trigger if
|
|
// the group in question already exists in /etc/passwd).
|
|
//
|
|
// Returns group entry (as a string that can be appended to /etc/group) and any
|
|
// error that occurred.
|
|
func (c *Container) generateGroupEntry() (string, error) {
|
|
groupString := ""
|
|
|
|
// Things we *can't* handle: adding the user we added in
|
|
// generatePasswdEntry to any *existing* groups.
|
|
addedGID := 0
|
|
if c.config.AddCurrentUserPasswdEntry {
|
|
entry, gid, err := c.generateCurrentUserGroupEntry()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
groupString += entry
|
|
addedGID = gid
|
|
}
|
|
if c.config.User != "" || c.config.GroupEntry != "" {
|
|
entry, err := c.generateUserGroupEntry(addedGID)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
groupString += entry
|
|
}
|
|
|
|
return groupString, nil
|
|
}
|
|
|
|
// Make an entry in /etc/group for the group of the user running podman iff we
|
|
// are rootless.
|
|
func (c *Container) generateCurrentUserGroupEntry() (string, int, error) {
|
|
gid := rootless.GetRootlessGID()
|
|
if gid == 0 {
|
|
return "", 0, nil
|
|
}
|
|
|
|
g, err := user.LookupGroupId(strconv.Itoa(gid))
|
|
if err != nil {
|
|
return "", 0, fmt.Errorf("failed to get current group: %w", err)
|
|
}
|
|
|
|
// Look up group name to see if it exists in the image.
|
|
_, err = lookup.GetGroup(c.state.Mountpoint, g.Name)
|
|
if err != runcuser.ErrNoGroupEntries {
|
|
return "", 0, err
|
|
}
|
|
|
|
// Look up GID to see if it exists in the image.
|
|
_, err = lookup.GetGroup(c.state.Mountpoint, g.Gid)
|
|
if err != runcuser.ErrNoGroupEntries {
|
|
return "", 0, err
|
|
}
|
|
|
|
// We need to get the username of the rootless user so we can add it to
|
|
// the group.
|
|
username := ""
|
|
uid := rootless.GetRootlessUID()
|
|
if uid != 0 {
|
|
u, err := user.LookupId(strconv.Itoa(uid))
|
|
if err != nil {
|
|
return "", 0, fmt.Errorf("failed to get current user to make group entry: %w", err)
|
|
}
|
|
username = u.Username
|
|
}
|
|
|
|
// Make the entry.
|
|
return fmt.Sprintf("%s:x:%s:%s\n", g.Name, g.Gid, username), gid, nil
|
|
}
|
|
|
|
// Make an entry in /etc/group for the group the container was specified to run
|
|
// as.
|
|
func (c *Container) generateUserGroupEntry(addedGID int) (string, error) {
|
|
if c.config.User == "" && c.config.GroupEntry == "" {
|
|
return "", nil
|
|
}
|
|
|
|
splitUser := strings.SplitN(c.config.User, ":", 2)
|
|
group := splitUser[0]
|
|
if len(splitUser) > 1 {
|
|
group = splitUser[1]
|
|
}
|
|
|
|
gid, err := strconv.ParseUint(group, 10, 32)
|
|
if err != nil {
|
|
return "", nil //nolint: nilerr
|
|
}
|
|
|
|
if addedGID != 0 && addedGID == int(gid) {
|
|
return "", nil
|
|
}
|
|
|
|
// Check if the group already exists
|
|
g, err := lookup.GetGroup(c.state.Mountpoint, group)
|
|
if err != runcuser.ErrNoGroupEntries {
|
|
return "", err
|
|
}
|
|
|
|
if c.config.GroupEntry != "" {
|
|
return c.groupEntry(g.Name, strconv.Itoa(g.Gid), g.List), nil
|
|
}
|
|
|
|
return fmt.Sprintf("%d:x:%d:%s\n", gid, gid, splitUser[0]), nil
|
|
}
|
|
|
|
func (c *Container) groupEntry(groupname, gid string, list []string) string {
|
|
s := c.config.GroupEntry
|
|
s = strings.ReplaceAll(s, "$GROUPNAME", groupname)
|
|
s = strings.ReplaceAll(s, "$GID", gid)
|
|
s = strings.ReplaceAll(s, "$USERLIST", strings.Join(list, ","))
|
|
return s + "\n"
|
|
}
|
|
|
|
// generatePasswdEntry generates an entry or entries into /etc/passwd as
|
|
// required by container configuration.
|
|
// Generally speaking, we will make an entry under two circumstances:
|
|
// 1. The container is started as a specific user who is not in /etc/passwd.
|
|
// This only triggers if the user is given as a *numeric* ID.
|
|
// 2. It is requested that Libpod add the user that launched Podman to
|
|
// /etc/passwd via AddCurrentUserPasswdEntry (though this does not trigger if
|
|
// the user in question already exists in /etc/passwd) or the UID to be added
|
|
// is 0).
|
|
// 3. The user specified additional host user accounts to add to the /etc/passwd file
|
|
//
|
|
// Returns password entry (as a string that can be appended to /etc/passwd) and
|
|
// any error that occurred.
|
|
func (c *Container) generatePasswdEntry() (string, error) {
|
|
passwdString := ""
|
|
|
|
addedUID := 0
|
|
for _, userid := range c.config.HostUsers {
|
|
// Look up User on host
|
|
u, err := util.LookupUser(userid)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
entry, err := c.userPasswdEntry(u)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
passwdString += entry
|
|
}
|
|
if c.config.AddCurrentUserPasswdEntry {
|
|
entry, uid, _, err := c.generateCurrentUserPasswdEntry()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
passwdString += entry
|
|
addedUID = uid
|
|
}
|
|
if c.config.User != "" {
|
|
entry, err := c.generateUserPasswdEntry(addedUID)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
passwdString += entry
|
|
}
|
|
|
|
return passwdString, nil
|
|
}
|
|
|
|
// generateCurrentUserPasswdEntry generates an /etc/passwd entry for the user
|
|
// running the container engine.
|
|
// Returns a passwd entry for the user, and the UID and GID of the added entry.
|
|
func (c *Container) generateCurrentUserPasswdEntry() (string, int, int, error) {
|
|
uid := rootless.GetRootlessUID()
|
|
if uid == 0 {
|
|
return "", 0, 0, nil
|
|
}
|
|
|
|
u, err := user.LookupId(strconv.Itoa(uid))
|
|
if err != nil {
|
|
return "", 0, 0, fmt.Errorf("failed to get current user: %w", err)
|
|
}
|
|
pwd, err := c.userPasswdEntry(u)
|
|
if err != nil {
|
|
return "", 0, 0, err
|
|
}
|
|
|
|
return pwd, uid, rootless.GetRootlessGID(), nil
|
|
}
|
|
|
|
// Sets the HOME env. variable with precedence: existing home env. variable, execUser home
|
|
func (c *Container) setHomeEnvIfNeeded() error {
|
|
getExecUserHome := func() (string, error) {
|
|
overrides := c.getUserOverrides()
|
|
execUser, err := lookup.GetUserGroupInfo(c.state.Mountpoint, c.config.User, overrides)
|
|
if err != nil {
|
|
if cutil.StringInSlice(c.config.User, c.config.HostUsers) {
|
|
execUser, err = lookupHostUser(c.config.User)
|
|
}
|
|
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
}
|
|
|
|
return execUser.Home, nil
|
|
}
|
|
|
|
// Ensure HOME is not already set in Env
|
|
for _, s := range c.config.Spec.Process.Env {
|
|
if strings.HasPrefix(s, "HOME=") {
|
|
return nil
|
|
}
|
|
}
|
|
|
|
home, err := getExecUserHome()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
c.config.Spec.Process.Env = append(c.config.Spec.Process.Env, fmt.Sprintf("HOME=%s", home))
|
|
return nil
|
|
}
|
|
|
|
func (c *Container) userPasswdEntry(u *user.User) (string, error) {
|
|
// Look up the user to see if it exists in the container image.
|
|
_, err := lookup.GetUser(c.state.Mountpoint, u.Username)
|
|
if err != runcuser.ErrNoPasswdEntries {
|
|
return "", err
|
|
}
|
|
|
|
// Look up the UID to see if it exists in the container image.
|
|
_, err = lookup.GetUser(c.state.Mountpoint, u.Uid)
|
|
if err != runcuser.ErrNoPasswdEntries {
|
|
return "", err
|
|
}
|
|
|
|
// If the user's actual home directory exists, or was mounted in - use
|
|
// that.
|
|
homeDir := c.WorkingDir()
|
|
hDir := u.HomeDir
|
|
for hDir != "/" {
|
|
if MountExists(c.config.Spec.Mounts, hDir) {
|
|
homeDir = u.HomeDir
|
|
break
|
|
}
|
|
hDir = filepath.Dir(hDir)
|
|
}
|
|
if homeDir != u.HomeDir {
|
|
for _, hDir := range c.UserVolumes() {
|
|
if hDir == u.HomeDir {
|
|
homeDir = u.HomeDir
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
if c.config.PasswdEntry != "" {
|
|
return c.passwdEntry(u.Username, u.Uid, u.Gid, u.Name, homeDir), nil
|
|
}
|
|
|
|
return fmt.Sprintf("%s:*:%s:%s:%s:%s:/bin/sh\n", u.Username, u.Uid, u.Gid, u.Name, homeDir), nil
|
|
}
|
|
|
|
// generateUserPasswdEntry generates an /etc/passwd entry for the container user
|
|
// to run in the container.
|
|
// The UID and GID of the added entry will also be returned.
|
|
// Accepts one argument, that being any UID that has already been added to the
|
|
// passwd file by other functions; if it matches the UID we were given, we don't
|
|
// need to do anything.
|
|
func (c *Container) generateUserPasswdEntry(addedUID int) (string, error) {
|
|
var (
|
|
groupspec string
|
|
gid int
|
|
)
|
|
if c.config.User == "" {
|
|
return "", nil
|
|
}
|
|
splitSpec := strings.SplitN(c.config.User, ":", 2)
|
|
userspec := splitSpec[0]
|
|
if len(splitSpec) > 1 {
|
|
groupspec = splitSpec[1]
|
|
}
|
|
// If a non numeric User, then don't generate passwd
|
|
uid, err := strconv.ParseUint(userspec, 10, 32)
|
|
if err != nil {
|
|
return "", nil //nolint: nilerr
|
|
}
|
|
|
|
if addedUID != 0 && int(uid) == addedUID {
|
|
return "", nil
|
|
}
|
|
|
|
// Look up the user to see if it exists in the container image
|
|
_, err = lookup.GetUser(c.state.Mountpoint, userspec)
|
|
if err != runcuser.ErrNoPasswdEntries {
|
|
return "", err
|
|
}
|
|
|
|
if groupspec != "" {
|
|
ugid, err := strconv.ParseUint(groupspec, 10, 32)
|
|
if err == nil {
|
|
gid = int(ugid)
|
|
} else {
|
|
group, err := lookup.GetGroup(c.state.Mountpoint, groupspec)
|
|
if err != nil {
|
|
return "", fmt.Errorf("unable to get gid %s from group file: %w", groupspec, err)
|
|
}
|
|
gid = group.Gid
|
|
}
|
|
}
|
|
|
|
if c.config.PasswdEntry != "" {
|
|
entry := c.passwdEntry(strconv.FormatUint(uid, 10), strconv.FormatUint(uid, 10), strconv.FormatInt(int64(gid), 10), "container user", c.WorkingDir())
|
|
return entry, nil
|
|
}
|
|
|
|
u, err := user.LookupId(strconv.FormatUint(uid, 10))
|
|
if err == nil {
|
|
return fmt.Sprintf("%s:*:%d:%d:%s:%s:/bin/sh\n", u.Username, uid, gid, u.Name, c.WorkingDir()), nil
|
|
}
|
|
return fmt.Sprintf("%d:*:%d:%d:container user:%s:/bin/sh\n", uid, uid, gid, c.WorkingDir()), nil
|
|
}
|
|
|
|
func (c *Container) passwdEntry(username, uid, gid, name, homeDir string) string {
|
|
s := c.config.PasswdEntry
|
|
s = strings.ReplaceAll(s, "$USERNAME", username)
|
|
s = strings.ReplaceAll(s, "$UID", uid)
|
|
s = strings.ReplaceAll(s, "$GID", gid)
|
|
s = strings.ReplaceAll(s, "$NAME", name)
|
|
s = strings.ReplaceAll(s, "$HOME", homeDir)
|
|
return s + "\n"
|
|
}
|
|
|
|
// generatePasswdAndGroup generates container-specific passwd and group files
|
|
// iff g.config.User is a number or we are configured to make a passwd entry for
|
|
// the current user or the user specified HostsUsers
|
|
// Returns path to file to mount at /etc/passwd, path to file to mount at
|
|
// /etc/group, and any error that occurred. If no passwd/group file were
|
|
// required, the empty string will be returned for those path (this may occur
|
|
// even if no error happened).
|
|
// This may modify the mounted container's /etc/passwd and /etc/group instead of
|
|
// making copies to bind-mount in, so we don't break useradd (it wants to make a
|
|
// copy of /etc/passwd and rename the copy to /etc/passwd, which is impossible
|
|
// with a bind mount). This is done in cases where the container is *not*
|
|
// read-only. In this case, the function will return nothing ("", "", nil).
|
|
func (c *Container) generatePasswdAndGroup() (string, string, error) {
|
|
if !c.config.AddCurrentUserPasswdEntry && c.config.User == "" &&
|
|
len(c.config.HostUsers) == 0 && c.config.GroupEntry == "" {
|
|
return "", "", nil
|
|
}
|
|
|
|
needPasswd := true
|
|
needGroup := true
|
|
|
|
// First, check if there's a mount at /etc/passwd or group, we don't
|
|
// want to interfere with user mounts.
|
|
if MountExists(c.config.Spec.Mounts, "/etc/passwd") {
|
|
needPasswd = false
|
|
}
|
|
if MountExists(c.config.Spec.Mounts, "/etc/group") {
|
|
needGroup = false
|
|
}
|
|
|
|
// Next, check if we already made the files. If we didn't, don't need to
|
|
// do anything more.
|
|
if needPasswd {
|
|
passwdPath := filepath.Join(c.config.StaticDir, "passwd")
|
|
if _, err := os.Stat(passwdPath); err == nil {
|
|
needPasswd = false
|
|
}
|
|
}
|
|
if needGroup {
|
|
groupPath := filepath.Join(c.config.StaticDir, "group")
|
|
if _, err := os.Stat(groupPath); err == nil {
|
|
needGroup = false
|
|
}
|
|
}
|
|
|
|
// If we don't need a /etc/passwd or /etc/group at this point we can
|
|
// just return.
|
|
if !needPasswd && !needGroup {
|
|
return "", "", nil
|
|
}
|
|
|
|
passwdPath := ""
|
|
groupPath := ""
|
|
|
|
ro := c.IsReadOnly()
|
|
|
|
if needPasswd {
|
|
passwdEntry, err := c.generatePasswdEntry()
|
|
if err != nil {
|
|
return "", "", err
|
|
}
|
|
|
|
needsWrite := passwdEntry != ""
|
|
switch {
|
|
case ro && needsWrite:
|
|
logrus.Debugf("Making /etc/passwd for container %s", c.ID())
|
|
originPasswdFile, err := securejoin.SecureJoin(c.state.Mountpoint, "/etc/passwd")
|
|
if err != nil {
|
|
return "", "", fmt.Errorf("creating path to container %s /etc/passwd: %w", c.ID(), err)
|
|
}
|
|
orig, err := os.ReadFile(originPasswdFile)
|
|
if err != nil && !os.IsNotExist(err) {
|
|
return "", "", err
|
|
}
|
|
passwdFile, err := c.writeStringToStaticDir("passwd", string(orig)+passwdEntry)
|
|
if err != nil {
|
|
return "", "", fmt.Errorf("failed to create temporary passwd file: %w", err)
|
|
}
|
|
if err := os.Chmod(passwdFile, 0644); err != nil {
|
|
return "", "", err
|
|
}
|
|
passwdPath = passwdFile
|
|
case !ro && needsWrite:
|
|
logrus.Debugf("Modifying container %s /etc/passwd", c.ID())
|
|
containerPasswd, err := securejoin.SecureJoin(c.state.Mountpoint, "/etc/passwd")
|
|
if err != nil {
|
|
return "", "", fmt.Errorf("looking up location of container %s /etc/passwd: %w", c.ID(), err)
|
|
}
|
|
|
|
f, err := os.OpenFile(containerPasswd, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
|
|
if err != nil {
|
|
return "", "", fmt.Errorf("container %s: %w", c.ID(), err)
|
|
}
|
|
defer f.Close()
|
|
|
|
if _, err := f.WriteString(passwdEntry); err != nil {
|
|
return "", "", fmt.Errorf("unable to append to container %s /etc/passwd: %w", c.ID(), err)
|
|
}
|
|
default:
|
|
logrus.Debugf("Not modifying container %s /etc/passwd", c.ID())
|
|
}
|
|
}
|
|
if needGroup {
|
|
groupEntry, err := c.generateGroupEntry()
|
|
if err != nil {
|
|
return "", "", err
|
|
}
|
|
|
|
needsWrite := groupEntry != ""
|
|
switch {
|
|
case ro && needsWrite:
|
|
logrus.Debugf("Making /etc/group for container %s", c.ID())
|
|
originGroupFile, err := securejoin.SecureJoin(c.state.Mountpoint, "/etc/group")
|
|
if err != nil {
|
|
return "", "", fmt.Errorf("creating path to container %s /etc/group: %w", c.ID(), err)
|
|
}
|
|
orig, err := os.ReadFile(originGroupFile)
|
|
if err != nil && !os.IsNotExist(err) {
|
|
return "", "", err
|
|
}
|
|
groupFile, err := c.writeStringToStaticDir("group", string(orig)+groupEntry)
|
|
if err != nil {
|
|
return "", "", fmt.Errorf("failed to create temporary group file: %w", err)
|
|
}
|
|
if err := os.Chmod(groupFile, 0644); err != nil {
|
|
return "", "", err
|
|
}
|
|
groupPath = groupFile
|
|
case !ro && needsWrite:
|
|
logrus.Debugf("Modifying container %s /etc/group", c.ID())
|
|
containerGroup, err := securejoin.SecureJoin(c.state.Mountpoint, "/etc/group")
|
|
if err != nil {
|
|
return "", "", fmt.Errorf("looking up location of container %s /etc/group: %w", c.ID(), err)
|
|
}
|
|
|
|
f, err := os.OpenFile(containerGroup, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
|
|
if err != nil {
|
|
return "", "", fmt.Errorf("container %s: %w", c.ID(), err)
|
|
}
|
|
defer f.Close()
|
|
|
|
if _, err := f.WriteString(groupEntry); err != nil {
|
|
return "", "", fmt.Errorf("unable to append to container %s /etc/group: %w", c.ID(), err)
|
|
}
|
|
default:
|
|
logrus.Debugf("Not modifying container %s /etc/group", c.ID())
|
|
}
|
|
}
|
|
|
|
return passwdPath, groupPath, nil
|
|
}
|
|
|
|
func (c *Container) copyTimezoneFile(zonePath string) (string, error) {
|
|
localtimeCopy := filepath.Join(c.state.RunDir, "localtime")
|
|
file, err := os.Stat(zonePath)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
if file.IsDir() {
|
|
return "", errors.New("invalid timezone: is a directory")
|
|
}
|
|
src, err := os.Open(zonePath)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
defer src.Close()
|
|
dest, err := os.Create(localtimeCopy)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
defer dest.Close()
|
|
_, err = io.Copy(dest, src)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
if err := c.relabel(localtimeCopy, c.config.MountLabel, false); err != nil {
|
|
return "", err
|
|
}
|
|
if err := dest.Chown(c.RootUID(), c.RootGID()); err != nil {
|
|
return "", err
|
|
}
|
|
return localtimeCopy, err
|
|
}
|
|
|
|
func (c *Container) cleanupOverlayMounts() error {
|
|
return overlay.CleanupContent(c.config.StaticDir)
|
|
}
|
|
|
|
// Creates and mounts an empty dir to mount secrets into, if it does not already exist
|
|
func (c *Container) createSecretMountDir(runPath string) error {
|
|
src := filepath.Join(c.state.RunDir, "/run/secrets")
|
|
_, err := os.Stat(src)
|
|
if os.IsNotExist(err) {
|
|
if err := umask.MkdirAllIgnoreUmask(src, os.FileMode(0o755)); err != nil {
|
|
return err
|
|
}
|
|
if err := label.Relabel(src, c.config.MountLabel, false); err != nil {
|
|
return err
|
|
}
|
|
if err := os.Chown(src, c.RootUID(), c.RootGID()); err != nil {
|
|
return err
|
|
}
|
|
c.state.BindMounts[filepath.Join(runPath, "secrets")] = src
|
|
return nil
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
// Fix ownership and permissions of the specified volume if necessary.
|
|
func (c *Container) fixVolumePermissions(v *ContainerNamedVolume) error {
|
|
vol, err := c.runtime.state.Volume(v.Name)
|
|
if err != nil {
|
|
return fmt.Errorf("retrieving named volume %s for container %s: %w", v.Name, c.ID(), err)
|
|
}
|
|
|
|
vol.lock.Lock()
|
|
defer vol.lock.Unlock()
|
|
|
|
// The volume may need a copy-up. Check the state.
|
|
if err := vol.update(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Volumes owned by a volume driver are not chowned - we don't want to
|
|
// mess with a mount not managed by us.
|
|
if vol.state.NeedsChown && (!vol.UsesVolumeDriver() && vol.config.Driver != "image") {
|
|
vol.state.NeedsChown = false
|
|
|
|
uid := int(c.config.Spec.Process.User.UID)
|
|
gid := int(c.config.Spec.Process.User.GID)
|
|
|
|
if c.config.IDMappings.UIDMap != nil {
|
|
p := idtools.IDPair{
|
|
UID: uid,
|
|
GID: gid,
|
|
}
|
|
mappings := idtools.NewIDMappingsFromMaps(c.config.IDMappings.UIDMap, c.config.IDMappings.GIDMap)
|
|
newPair, err := mappings.ToHost(p)
|
|
if err != nil {
|
|
return fmt.Errorf("mapping user %d:%d: %w", uid, gid, err)
|
|
}
|
|
uid = newPair.UID
|
|
gid = newPair.GID
|
|
}
|
|
|
|
vol.state.UIDChowned = uid
|
|
vol.state.GIDChowned = gid
|
|
|
|
if err := vol.save(); err != nil {
|
|
return err
|
|
}
|
|
|
|
mountPoint, err := vol.MountPoint()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := os.Lchown(mountPoint, uid, gid); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Make sure the new volume matches the permissions of the target directory.
|
|
// https://github.com/containers/podman/issues/10188
|
|
st, err := os.Lstat(filepath.Join(c.state.Mountpoint, v.Dest))
|
|
if err == nil {
|
|
if stat, ok := st.Sys().(*syscall.Stat_t); ok {
|
|
if err := os.Lchown(mountPoint, int(stat.Uid), int(stat.Gid)); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if err := os.Chmod(mountPoint, st.Mode()); err != nil {
|
|
return err
|
|
}
|
|
if err := setVolumeAtime(mountPoint, st); err != nil {
|
|
return err
|
|
}
|
|
} else if !os.IsNotExist(err) {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (c *Container) relabel(src, mountLabel string, shared bool) error {
|
|
if !selinux.GetEnabled() || mountLabel == "" {
|
|
return nil
|
|
}
|
|
// only relabel on initial creation of container
|
|
if !c.ensureState(define.ContainerStateConfigured, define.ContainerStateUnknown) {
|
|
label, err := label.FileLabel(src)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// If labels are different, might be on a tmpfs
|
|
if label == mountLabel {
|
|
return nil
|
|
}
|
|
}
|
|
return label.Relabel(src, mountLabel, shared)
|
|
}
|
|
|
|
func (c *Container) ChangeHostPathOwnership(src string, recurse bool, uid, gid int) error {
|
|
// only chown on initial creation of container
|
|
if !c.ensureState(define.ContainerStateConfigured, define.ContainerStateUnknown) {
|
|
st, err := os.Stat(src)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// If labels are different, might be on a tmpfs
|
|
if int(st.Sys().(*syscall.Stat_t).Uid) == uid && int(st.Sys().(*syscall.Stat_t).Gid) == gid {
|
|
return nil
|
|
}
|
|
}
|
|
return chown.ChangeHostPathOwnership(src, recurse, uid, gid)
|
|
}
|
|
|
|
func (c *Container) umask() (uint32, error) {
|
|
decVal, err := strconv.ParseUint(c.config.Umask, 8, 32)
|
|
if err != nil {
|
|
return 0, fmt.Errorf("invalid Umask Value: %w", err)
|
|
}
|
|
return uint32(decVal), nil
|
|
}
|
|
|
|
func maybeClampOOMScoreAdj(oomScoreValue int) (int, error) {
|
|
v, err := os.ReadFile("/proc/self/oom_score_adj")
|
|
if err != nil {
|
|
return oomScoreValue, err
|
|
}
|
|
currentValue, err := strconv.Atoi(strings.TrimRight(string(v), "\n"))
|
|
if err != nil {
|
|
return oomScoreValue, err
|
|
}
|
|
if currentValue > oomScoreValue {
|
|
logrus.Warnf("Requested oom_score_adj=%d is lower than the current one, changing to %d", oomScoreValue, currentValue)
|
|
return currentValue, nil
|
|
}
|
|
return oomScoreValue, nil
|
|
}
|