mirror of https://github.com/containers/podman.git
696 lines
21 KiB
Go
696 lines
21 KiB
Go
package specgenutil
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import (
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"fmt"
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"path/filepath"
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"strings"
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"github.com/containers/common/pkg/parse"
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"github.com/containers/podman/v4/libpod/define"
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"github.com/containers/podman/v4/pkg/specgen"
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"github.com/containers/podman/v4/pkg/util"
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spec "github.com/opencontainers/runtime-spec/specs-go"
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"github.com/pkg/errors"
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)
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var (
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errDuplicateDest = errors.Errorf("duplicate mount destination")
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optionArgError = errors.Errorf("must provide an argument for option")
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noDestError = errors.Errorf("must set volume destination")
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errInvalidSyntax = errors.Errorf("incorrect mount format: should be --mount type=<bind|tmpfs|volume>,[src=<host-dir|volume-name>,]target=<ctr-dir>[,options]")
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)
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// Parse all volume-related options in the create config into a set of mounts
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// and named volumes to add to the container.
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// Handles --volumes, --mount, and --tmpfs flags.
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// Does not handle image volumes, init, and --volumes-from flags.
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// Can also add tmpfs mounts from read-only tmpfs.
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// TODO: handle options parsing/processing via containers/storage/pkg/mount
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func parseVolumes(volumeFlag, mountFlag, tmpfsFlag []string, addReadOnlyTmpfs bool) ([]spec.Mount, []*specgen.NamedVolume, []*specgen.OverlayVolume, []*specgen.ImageVolume, error) {
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// Get mounts from the --mounts flag.
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unifiedMounts, unifiedVolumes, unifiedImageVolumes, err := getMounts(mountFlag)
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if err != nil {
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return nil, nil, nil, nil, err
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}
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// Next --volumes flag.
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volumeMounts, volumeVolumes, overlayVolumes, err := specgen.GenVolumeMounts(volumeFlag)
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if err != nil {
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return nil, nil, nil, nil, err
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}
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// Next --tmpfs flag.
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tmpfsMounts, err := getTmpfsMounts(tmpfsFlag)
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if err != nil {
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return nil, nil, nil, nil, err
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}
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// Unify mounts from --mount, --volume, --tmpfs.
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// Start with --volume.
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for dest, mount := range volumeMounts {
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if _, ok := unifiedMounts[dest]; ok {
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return nil, nil, nil, nil, errors.Wrapf(errDuplicateDest, dest)
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}
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unifiedMounts[dest] = mount
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}
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for dest, volume := range volumeVolumes {
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if _, ok := unifiedVolumes[dest]; ok {
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return nil, nil, nil, nil, errors.Wrapf(errDuplicateDest, dest)
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}
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unifiedVolumes[dest] = volume
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}
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// Now --tmpfs
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for dest, tmpfs := range tmpfsMounts {
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if _, ok := unifiedMounts[dest]; ok {
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return nil, nil, nil, nil, errors.Wrapf(errDuplicateDest, dest)
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}
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unifiedMounts[dest] = tmpfs
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}
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// If requested, add tmpfs filesystems for read-only containers.
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if addReadOnlyTmpfs {
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readonlyTmpfs := []string{"/tmp", "/var/tmp", "/run"}
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options := []string{"rw", "rprivate", "nosuid", "nodev", "tmpcopyup"}
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for _, dest := range readonlyTmpfs {
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if _, ok := unifiedMounts[dest]; ok {
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continue
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}
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if _, ok := unifiedVolumes[dest]; ok {
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continue
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}
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unifiedMounts[dest] = spec.Mount{
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Destination: dest,
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Type: define.TypeTmpfs,
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Source: "tmpfs",
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Options: options,
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}
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}
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}
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// Check for conflicts between named volumes, overlay & image volumes,
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// and mounts
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allMounts := make(map[string]bool)
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testAndSet := func(dest string) error {
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if _, ok := allMounts[dest]; ok {
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return errors.Wrapf(errDuplicateDest, "conflict at mount destination %v", dest)
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}
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allMounts[dest] = true
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return nil
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}
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for dest := range unifiedMounts {
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if err := testAndSet(dest); err != nil {
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return nil, nil, nil, nil, err
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}
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}
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for dest := range unifiedVolumes {
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if err := testAndSet(dest); err != nil {
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return nil, nil, nil, nil, err
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}
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}
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for dest := range overlayVolumes {
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if err := testAndSet(dest); err != nil {
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return nil, nil, nil, nil, err
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}
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}
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for dest := range unifiedImageVolumes {
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if err := testAndSet(dest); err != nil {
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return nil, nil, nil, nil, err
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}
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}
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// Final step: maps to arrays
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finalMounts := make([]spec.Mount, 0, len(unifiedMounts))
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for _, mount := range unifiedMounts {
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if mount.Type == define.TypeBind {
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absSrc, err := filepath.Abs(mount.Source)
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if err != nil {
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return nil, nil, nil, nil, errors.Wrapf(err, "error getting absolute path of %s", mount.Source)
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}
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mount.Source = absSrc
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}
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finalMounts = append(finalMounts, mount)
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}
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finalVolumes := make([]*specgen.NamedVolume, 0, len(unifiedVolumes))
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for _, volume := range unifiedVolumes {
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finalVolumes = append(finalVolumes, volume)
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}
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finalOverlayVolume := make([]*specgen.OverlayVolume, 0)
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for _, volume := range overlayVolumes {
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finalOverlayVolume = append(finalOverlayVolume, volume)
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}
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finalImageVolumes := make([]*specgen.ImageVolume, 0, len(unifiedImageVolumes))
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for _, volume := range unifiedImageVolumes {
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finalImageVolumes = append(finalImageVolumes, volume)
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}
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return finalMounts, finalVolumes, finalOverlayVolume, finalImageVolumes, nil
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}
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// findMountType parses the input and extracts the type of the mount type and
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// the remaining non-type tokens.
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func findMountType(input string) (mountType string, tokens []string, err error) {
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// Split by comma, iterate over the slice and look for
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// "type=$mountType". Everything else is appended to tokens.
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found := false
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for _, s := range strings.Split(input, ",") {
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kv := strings.Split(s, "=")
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if found || !(len(kv) == 2 && kv[0] == "type") {
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tokens = append(tokens, s)
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continue
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}
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mountType = kv[1]
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found = true
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}
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if !found {
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err = errInvalidSyntax
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}
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return
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}
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// getMounts takes user-provided input from the --mount flag and creates OCI
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// spec mounts and Libpod named volumes.
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// podman run --mount type=bind,src=/etc/resolv.conf,target=/etc/resolv.conf ...
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// podman run --mount type=tmpfs,target=/dev/shm ...
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// podman run --mount type=volume,source=test-volume, ...
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func getMounts(mountFlag []string) (map[string]spec.Mount, map[string]*specgen.NamedVolume, map[string]*specgen.ImageVolume, error) {
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finalMounts := make(map[string]spec.Mount)
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finalNamedVolumes := make(map[string]*specgen.NamedVolume)
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finalImageVolumes := make(map[string]*specgen.ImageVolume)
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for _, mount := range mountFlag {
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// TODO: Docker defaults to "volume" if no mount type is specified.
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mountType, tokens, err := findMountType(mount)
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if err != nil {
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return nil, nil, nil, err
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}
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switch mountType {
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case define.TypeBind:
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mount, err := getBindMount(tokens)
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if err != nil {
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return nil, nil, nil, err
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}
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if _, ok := finalMounts[mount.Destination]; ok {
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return nil, nil, nil, errors.Wrapf(errDuplicateDest, mount.Destination)
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}
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finalMounts[mount.Destination] = mount
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case define.TypeTmpfs:
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mount, err := getTmpfsMount(tokens)
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if err != nil {
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return nil, nil, nil, err
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}
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if _, ok := finalMounts[mount.Destination]; ok {
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return nil, nil, nil, errors.Wrapf(errDuplicateDest, mount.Destination)
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}
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finalMounts[mount.Destination] = mount
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case define.TypeDevpts:
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mount, err := getDevptsMount(tokens)
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if err != nil {
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return nil, nil, nil, err
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}
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if _, ok := finalMounts[mount.Destination]; ok {
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return nil, nil, nil, errors.Wrapf(errDuplicateDest, mount.Destination)
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}
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finalMounts[mount.Destination] = mount
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case "image":
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volume, err := getImageVolume(tokens)
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if err != nil {
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return nil, nil, nil, err
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}
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if _, ok := finalImageVolumes[volume.Destination]; ok {
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return nil, nil, nil, errors.Wrapf(errDuplicateDest, volume.Destination)
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}
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finalImageVolumes[volume.Destination] = volume
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case "volume":
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volume, err := getNamedVolume(tokens)
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if err != nil {
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return nil, nil, nil, err
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}
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if _, ok := finalNamedVolumes[volume.Dest]; ok {
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return nil, nil, nil, errors.Wrapf(errDuplicateDest, volume.Dest)
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}
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finalNamedVolumes[volume.Dest] = volume
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default:
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return nil, nil, nil, errors.Errorf("invalid filesystem type %q", mountType)
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}
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}
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return finalMounts, finalNamedVolumes, finalImageVolumes, nil
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}
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// Parse a single bind mount entry from the --mount flag.
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func getBindMount(args []string) (spec.Mount, error) {
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newMount := spec.Mount{
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Type: define.TypeBind,
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}
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var setSource, setDest, setRORW, setSuid, setDev, setExec, setRelabel, setOwnership bool
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for _, val := range args {
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kv := strings.SplitN(val, "=", 2)
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switch kv[0] {
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case "bind-nonrecursive":
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newMount.Options = append(newMount.Options, "bind")
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case "readonly", "ro", "rw":
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if setRORW {
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return newMount, errors.Wrapf(optionArgError, "cannot pass 'readonly', 'ro', or 'rw' options more than once")
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}
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setRORW = true
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// Can be formatted as one of:
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// readonly
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// readonly=[true|false]
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// ro
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// ro=[true|false]
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// rw
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// rw=[true|false]
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if kv[0] == "readonly" {
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kv[0] = "ro"
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}
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switch len(kv) {
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case 1:
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newMount.Options = append(newMount.Options, kv[0])
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case 2:
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switch strings.ToLower(kv[1]) {
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case "true":
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newMount.Options = append(newMount.Options, kv[0])
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case "false":
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// Set the opposite only for rw
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// ro's opposite is the default
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if kv[0] == "rw" {
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newMount.Options = append(newMount.Options, "ro")
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}
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default:
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return newMount, errors.Wrapf(optionArgError, "'readonly', 'ro', or 'rw' must be set to true or false, instead received %q", kv[1])
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}
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default:
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return newMount, errors.Wrapf(optionArgError, "badly formatted option %q", val)
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}
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case "nosuid", "suid":
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if setSuid {
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return newMount, errors.Wrapf(optionArgError, "cannot pass 'nosuid' and 'suid' options more than once")
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}
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setSuid = true
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newMount.Options = append(newMount.Options, kv[0])
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case "nodev", "dev":
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if setDev {
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return newMount, errors.Wrapf(optionArgError, "cannot pass 'nodev' and 'dev' options more than once")
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}
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setDev = true
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newMount.Options = append(newMount.Options, kv[0])
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case "noexec", "exec":
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if setExec {
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return newMount, errors.Wrapf(optionArgError, "cannot pass 'noexec' and 'exec' options more than once")
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}
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setExec = true
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newMount.Options = append(newMount.Options, kv[0])
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case "shared", "rshared", "private", "rprivate", "slave", "rslave", "unbindable", "runbindable", "Z", "z":
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newMount.Options = append(newMount.Options, kv[0])
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case "bind-propagation":
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if len(kv) == 1 {
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return newMount, errors.Wrapf(optionArgError, kv[0])
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}
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newMount.Options = append(newMount.Options, kv[1])
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case "src", "source":
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if len(kv) == 1 {
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return newMount, errors.Wrapf(optionArgError, kv[0])
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}
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if len(kv[1]) == 0 {
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return newMount, errors.Wrapf(optionArgError, "host directory cannot be empty")
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}
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newMount.Source = kv[1]
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setSource = true
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case "target", "dst", "destination":
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if len(kv) == 1 {
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return newMount, errors.Wrapf(optionArgError, kv[0])
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}
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if err := parse.ValidateVolumeCtrDir(kv[1]); err != nil {
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return newMount, err
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}
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newMount.Destination = filepath.Clean(kv[1])
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setDest = true
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case "relabel":
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if setRelabel {
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return newMount, errors.Wrapf(optionArgError, "cannot pass 'relabel' option more than once")
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}
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setRelabel = true
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if len(kv) != 2 {
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return newMount, errors.Wrapf(util.ErrBadMntOption, "%s mount option must be 'private' or 'shared'", kv[0])
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}
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switch kv[1] {
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case "private":
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newMount.Options = append(newMount.Options, "Z")
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case "shared":
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newMount.Options = append(newMount.Options, "z")
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default:
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return newMount, errors.Wrapf(util.ErrBadMntOption, "%s mount option must be 'private' or 'shared'", kv[0])
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}
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case "U", "chown":
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if setOwnership {
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return newMount, errors.Wrapf(optionArgError, "cannot pass 'U' or 'chown' option more than once")
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}
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ok, err := validChownFlag(val)
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if err != nil {
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return newMount, err
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}
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if ok {
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newMount.Options = append(newMount.Options, "U")
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}
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setOwnership = true
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case "idmap":
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if len(kv) > 1 {
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newMount.Options = append(newMount.Options, fmt.Sprintf("idmap=%s", kv[1]))
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} else {
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newMount.Options = append(newMount.Options, "idmap")
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}
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case "consistency":
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// Often used on MACs and mistakenly on Linux platforms.
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// Since Docker ignores this option so shall we.
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continue
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default:
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return newMount, errors.Wrapf(util.ErrBadMntOption, "%s", kv[0])
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}
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}
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if !setDest {
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return newMount, noDestError
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}
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if !setSource {
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newMount.Source = newMount.Destination
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}
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options, err := parse.ValidateVolumeOpts(newMount.Options)
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if err != nil {
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return newMount, err
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}
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newMount.Options = options
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return newMount, nil
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}
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// Parse a single tmpfs mount entry from the --mount flag
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func getTmpfsMount(args []string) (spec.Mount, error) {
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newMount := spec.Mount{
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Type: define.TypeTmpfs,
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Source: define.TypeTmpfs,
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}
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var setDest, setRORW, setSuid, setDev, setExec, setTmpcopyup, setOwnership bool
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for _, val := range args {
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kv := strings.SplitN(val, "=", 2)
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switch kv[0] {
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case "tmpcopyup", "notmpcopyup":
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if setTmpcopyup {
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return newMount, errors.Wrapf(optionArgError, "cannot pass 'tmpcopyup' and 'notmpcopyup' options more than once")
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}
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setTmpcopyup = true
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newMount.Options = append(newMount.Options, kv[0])
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case "ro", "rw":
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if setRORW {
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return newMount, errors.Wrapf(optionArgError, "cannot pass 'ro' and 'rw' options more than once")
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}
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setRORW = true
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newMount.Options = append(newMount.Options, kv[0])
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case "nosuid", "suid":
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if setSuid {
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return newMount, errors.Wrapf(optionArgError, "cannot pass 'nosuid' and 'suid' options more than once")
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}
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setSuid = true
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newMount.Options = append(newMount.Options, kv[0])
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case "nodev", "dev":
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if setDev {
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return newMount, errors.Wrapf(optionArgError, "cannot pass 'nodev' and 'dev' options more than once")
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}
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setDev = true
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newMount.Options = append(newMount.Options, kv[0])
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case "noexec", "exec":
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if setExec {
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return newMount, errors.Wrapf(optionArgError, "cannot pass 'noexec' and 'exec' options more than once")
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}
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setExec = true
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newMount.Options = append(newMount.Options, kv[0])
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case "tmpfs-mode":
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if len(kv) == 1 {
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return newMount, errors.Wrapf(optionArgError, kv[0])
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}
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newMount.Options = append(newMount.Options, fmt.Sprintf("mode=%s", kv[1]))
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case "tmpfs-size":
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if len(kv) == 1 {
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return newMount, errors.Wrapf(optionArgError, kv[0])
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}
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newMount.Options = append(newMount.Options, fmt.Sprintf("size=%s", kv[1]))
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case "src", "source":
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return newMount, errors.Errorf("source is not supported with tmpfs mounts")
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case "target", "dst", "destination":
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if len(kv) == 1 {
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return newMount, errors.Wrapf(optionArgError, kv[0])
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}
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if err := parse.ValidateVolumeCtrDir(kv[1]); err != nil {
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return newMount, err
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}
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newMount.Destination = filepath.Clean(kv[1])
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setDest = true
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case "U", "chown":
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if setOwnership {
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return newMount, errors.Wrapf(optionArgError, "cannot pass 'U' or 'chown' option more than once")
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}
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ok, err := validChownFlag(val)
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if err != nil {
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return newMount, err
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}
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if ok {
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newMount.Options = append(newMount.Options, "U")
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}
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setOwnership = true
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case "consistency":
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// Often used on MACs and mistakenly on Linux platforms.
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// Since Docker ignores this option so shall we.
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continue
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default:
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return newMount, errors.Wrapf(util.ErrBadMntOption, "%s", kv[0])
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}
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}
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if !setDest {
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return newMount, noDestError
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}
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return newMount, nil
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}
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// Parse a single devpts mount entry from the --mount flag
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func getDevptsMount(args []string) (spec.Mount, error) {
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newMount := spec.Mount{
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Type: define.TypeDevpts,
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Source: define.TypeDevpts,
|
|
}
|
|
|
|
var setDest bool
|
|
|
|
for _, val := range args {
|
|
kv := strings.SplitN(val, "=", 2)
|
|
switch kv[0] {
|
|
case "uid", "gid", "mode", "ptxmode", "newinstance", "max":
|
|
newMount.Options = append(newMount.Options, val)
|
|
case "target", "dst", "destination":
|
|
if len(kv) == 1 {
|
|
return newMount, errors.Wrapf(optionArgError, kv[0])
|
|
}
|
|
if err := parse.ValidateVolumeCtrDir(kv[1]); err != nil {
|
|
return newMount, err
|
|
}
|
|
newMount.Destination = filepath.Clean(kv[1])
|
|
setDest = true
|
|
default:
|
|
return newMount, errors.Wrapf(util.ErrBadMntOption, "%s", kv[0])
|
|
}
|
|
}
|
|
|
|
if !setDest {
|
|
return newMount, noDestError
|
|
}
|
|
|
|
return newMount, nil
|
|
}
|
|
|
|
// Parse a single volume mount entry from the --mount flag.
|
|
// Note that the volume-label option for named volumes is currently NOT supported.
|
|
// TODO: add support for --volume-label
|
|
func getNamedVolume(args []string) (*specgen.NamedVolume, error) {
|
|
newVolume := new(specgen.NamedVolume)
|
|
|
|
var setSource, setDest, setRORW, setSuid, setDev, setExec, setOwnership bool
|
|
|
|
for _, val := range args {
|
|
kv := strings.SplitN(val, "=", 2)
|
|
switch kv[0] {
|
|
case "ro", "rw":
|
|
if setRORW {
|
|
return nil, errors.Wrapf(optionArgError, "cannot pass 'ro' and 'rw' options more than once")
|
|
}
|
|
setRORW = true
|
|
newVolume.Options = append(newVolume.Options, kv[0])
|
|
case "nosuid", "suid":
|
|
if setSuid {
|
|
return nil, errors.Wrapf(optionArgError, "cannot pass 'nosuid' and 'suid' options more than once")
|
|
}
|
|
setSuid = true
|
|
newVolume.Options = append(newVolume.Options, kv[0])
|
|
case "nodev", "dev":
|
|
if setDev {
|
|
return nil, errors.Wrapf(optionArgError, "cannot pass 'nodev' and 'dev' options more than once")
|
|
}
|
|
setDev = true
|
|
newVolume.Options = append(newVolume.Options, kv[0])
|
|
case "noexec", "exec":
|
|
if setExec {
|
|
return nil, errors.Wrapf(optionArgError, "cannot pass 'noexec' and 'exec' options more than once")
|
|
}
|
|
setExec = true
|
|
newVolume.Options = append(newVolume.Options, kv[0])
|
|
case "volume-label":
|
|
return nil, errors.Errorf("the --volume-label option is not presently implemented")
|
|
case "src", "source":
|
|
if len(kv) == 1 {
|
|
return nil, errors.Wrapf(optionArgError, kv[0])
|
|
}
|
|
newVolume.Name = kv[1]
|
|
setSource = true
|
|
case "target", "dst", "destination":
|
|
if len(kv) == 1 {
|
|
return nil, errors.Wrapf(optionArgError, kv[0])
|
|
}
|
|
if err := parse.ValidateVolumeCtrDir(kv[1]); err != nil {
|
|
return nil, err
|
|
}
|
|
newVolume.Dest = filepath.Clean(kv[1])
|
|
setDest = true
|
|
case "U", "chown":
|
|
if setOwnership {
|
|
return newVolume, errors.Wrapf(optionArgError, "cannot pass 'U' or 'chown' option more than once")
|
|
}
|
|
ok, err := validChownFlag(val)
|
|
if err != nil {
|
|
return newVolume, err
|
|
}
|
|
if ok {
|
|
newVolume.Options = append(newVolume.Options, "U")
|
|
}
|
|
setOwnership = true
|
|
case "consistency":
|
|
// Often used on MACs and mistakenly on Linux platforms.
|
|
// Since Docker ignores this option so shall we.
|
|
continue
|
|
default:
|
|
return nil, errors.Wrapf(util.ErrBadMntOption, "%s", kv[0])
|
|
}
|
|
}
|
|
|
|
if !setSource {
|
|
return nil, errors.Errorf("must set source volume")
|
|
}
|
|
if !setDest {
|
|
return nil, noDestError
|
|
}
|
|
|
|
return newVolume, nil
|
|
}
|
|
|
|
// Parse the arguments into an image volume. An image volume is a volume based
|
|
// on a container image. The container image is first mounted on the host and
|
|
// is then bind-mounted into the container. An ImageVolume is always mounted
|
|
// read only.
|
|
func getImageVolume(args []string) (*specgen.ImageVolume, error) {
|
|
newVolume := new(specgen.ImageVolume)
|
|
|
|
for _, val := range args {
|
|
kv := strings.SplitN(val, "=", 2)
|
|
switch kv[0] {
|
|
case "src", "source":
|
|
if len(kv) == 1 {
|
|
return nil, errors.Wrapf(optionArgError, kv[0])
|
|
}
|
|
newVolume.Source = kv[1]
|
|
case "target", "dst", "destination":
|
|
if len(kv) == 1 {
|
|
return nil, errors.Wrapf(optionArgError, kv[0])
|
|
}
|
|
if err := parse.ValidateVolumeCtrDir(kv[1]); err != nil {
|
|
return nil, err
|
|
}
|
|
newVolume.Destination = filepath.Clean(kv[1])
|
|
case "rw", "readwrite":
|
|
switch kv[1] {
|
|
case "true":
|
|
newVolume.ReadWrite = true
|
|
case "false":
|
|
// Nothing to do. RO is default.
|
|
default:
|
|
return nil, errors.Wrapf(util.ErrBadMntOption, "invalid rw value %q", kv[1])
|
|
}
|
|
case "consistency":
|
|
// Often used on MACs and mistakenly on Linux platforms.
|
|
// Since Docker ignores this option so shall we.
|
|
continue
|
|
default:
|
|
return nil, errors.Wrapf(util.ErrBadMntOption, "%s", kv[0])
|
|
}
|
|
}
|
|
|
|
if len(newVolume.Source)*len(newVolume.Destination) == 0 {
|
|
return nil, errors.Errorf("must set source and destination for image volume")
|
|
}
|
|
|
|
return newVolume, nil
|
|
}
|
|
|
|
// GetTmpfsMounts creates spec.Mount structs for user-requested tmpfs mounts
|
|
func getTmpfsMounts(tmpfsFlag []string) (map[string]spec.Mount, error) {
|
|
m := make(map[string]spec.Mount)
|
|
for _, i := range tmpfsFlag {
|
|
// Default options if nothing passed
|
|
var options []string
|
|
spliti := strings.Split(i, ":")
|
|
destPath := spliti[0]
|
|
if err := parse.ValidateVolumeCtrDir(spliti[0]); err != nil {
|
|
return nil, err
|
|
}
|
|
if len(spliti) > 1 {
|
|
options = strings.Split(spliti[1], ",")
|
|
}
|
|
|
|
if _, ok := m[destPath]; ok {
|
|
return nil, errors.Wrapf(errDuplicateDest, destPath)
|
|
}
|
|
|
|
mount := spec.Mount{
|
|
Destination: filepath.Clean(destPath),
|
|
Type: define.TypeTmpfs,
|
|
Options: options,
|
|
Source: define.TypeTmpfs,
|
|
}
|
|
m[destPath] = mount
|
|
}
|
|
return m, nil
|
|
}
|
|
|
|
// validChownFlag ensures that the U or chown flag is correctly used
|
|
func validChownFlag(flag string) (bool, error) {
|
|
kv := strings.SplitN(flag, "=", 2)
|
|
switch len(kv) {
|
|
case 1:
|
|
case 2:
|
|
// U=[true|false]
|
|
switch strings.ToLower(kv[1]) {
|
|
case "true":
|
|
case "false":
|
|
return false, nil
|
|
default:
|
|
return false, errors.Wrapf(optionArgError, "'U' or 'chown' must be set to true or false, instead received %q", kv[1])
|
|
}
|
|
default:
|
|
return false, errors.Wrapf(optionArgError, "badly formatted option %q", flag)
|
|
}
|
|
|
|
return true, nil
|
|
}
|