mirror of https://github.com/containers/podman.git
123 lines
3.4 KiB
Go
123 lines
3.4 KiB
Go
// +build linux
|
|
|
|
package libpod
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
"syscall"
|
|
|
|
"github.com/containers/libpod/libpod/define"
|
|
"github.com/containers/libpod/pkg/cgroups"
|
|
"github.com/containers/libpod/pkg/rootless"
|
|
"github.com/opencontainers/selinux/go-selinux/label"
|
|
"github.com/pkg/errors"
|
|
"github.com/sirupsen/logrus"
|
|
"golang.org/x/sys/unix"
|
|
)
|
|
|
|
// systemdSliceFromPath makes a new systemd slice under the given parent with
|
|
// the given name.
|
|
// The parent must be a slice. The name must NOT include ".slice"
|
|
func systemdSliceFromPath(parent, name string) (string, error) {
|
|
cgroupPath, err := assembleSystemdCgroupName(parent, name)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
logrus.Debugf("Created cgroup path %s for parent %s and name %s", cgroupPath, parent, name)
|
|
|
|
if err := makeSystemdCgroup(cgroupPath); err != nil {
|
|
return "", errors.Wrapf(err, "error creating cgroup %s", cgroupPath)
|
|
}
|
|
|
|
logrus.Debugf("Created cgroup %s", cgroupPath)
|
|
|
|
return cgroupPath, nil
|
|
}
|
|
|
|
func getDefaultSystemdCgroup() string {
|
|
if rootless.IsRootless() {
|
|
return SystemdDefaultRootlessCgroupParent
|
|
}
|
|
return SystemdDefaultCgroupParent
|
|
}
|
|
|
|
// makeSystemdCgroup creates a systemd CGroup at the given location.
|
|
func makeSystemdCgroup(path string) error {
|
|
controller, err := cgroups.NewSystemd(getDefaultSystemdCgroup())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if rootless.IsRootless() {
|
|
return controller.CreateSystemdUserUnit(path, rootless.GetRootlessUID())
|
|
}
|
|
return controller.CreateSystemdUnit(path)
|
|
}
|
|
|
|
// deleteSystemdCgroup deletes the systemd cgroup at the given location
|
|
func deleteSystemdCgroup(path string) error {
|
|
controller, err := cgroups.NewSystemd(getDefaultSystemdCgroup())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if rootless.IsRootless() {
|
|
conn, err := cgroups.GetUserConnection(rootless.GetRootlessUID())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer conn.Close()
|
|
return controller.DeleteByPathConn(path, conn)
|
|
}
|
|
|
|
return controller.DeleteByPath(path)
|
|
}
|
|
|
|
// assembleSystemdCgroupName creates a systemd cgroup path given a base and
|
|
// a new component to add.
|
|
// The base MUST be systemd slice (end in .slice)
|
|
func assembleSystemdCgroupName(baseSlice, newSlice string) (string, error) {
|
|
const sliceSuffix = ".slice"
|
|
|
|
if !strings.HasSuffix(baseSlice, sliceSuffix) {
|
|
return "", errors.Wrapf(define.ErrInvalidArg, "cannot assemble cgroup path with base %q - must end in .slice", baseSlice)
|
|
}
|
|
|
|
noSlice := strings.TrimSuffix(baseSlice, sliceSuffix)
|
|
final := fmt.Sprintf("%s/%s-%s%s", baseSlice, noSlice, newSlice, sliceSuffix)
|
|
|
|
return final, nil
|
|
}
|
|
|
|
// LabelVolumePath takes a mount path for a volume and gives it an
|
|
// selinux label of either shared or not
|
|
func LabelVolumePath(path string, shared bool) error {
|
|
_, mountLabel, err := label.InitLabels([]string{})
|
|
if err != nil {
|
|
return errors.Wrapf(err, "error getting default mountlabels")
|
|
}
|
|
if err := label.ReleaseLabel(mountLabel); err != nil {
|
|
return errors.Wrapf(err, "error releasing label %q", mountLabel)
|
|
}
|
|
if err := label.Relabel(path, mountLabel, shared); err != nil {
|
|
permString := "private"
|
|
if shared {
|
|
permString = "shared"
|
|
}
|
|
return errors.Wrapf(err, "error setting selinux label for %s to %q as %s", path, mountLabel, permString)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Unmount umounts a target directory
|
|
func Unmount(mount string) {
|
|
if err := unix.Unmount(mount, unix.MNT_DETACH); err != nil {
|
|
if err != syscall.EINVAL {
|
|
logrus.Warnf("failed to unmount %s : %v", mount, err)
|
|
} else {
|
|
logrus.Debugf("failed to unmount %s : %v", mount, err)
|
|
}
|
|
}
|
|
}
|