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// +build linux
package libpod
import (
"fmt"
"strings"
"github.com/containerd/cgroups"
"github.com/containers/libpod/libpod/define"
"github.com/containers/libpod/pkg/util"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/selinux/go-selinux/label"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// 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
}
// makeSystemdCgroup creates a systemd CGroup at the given location.
func makeSystemdCgroup(path string) error {
controller, err := cgroups.NewSystemd(SystemdDefaultCgroupParent)
if err != nil {
return err
}
return controller.Create(path, &spec.LinuxResources{})
}
// deleteSystemdCgroup deletes the systemd cgroup at the given location
func deleteSystemdCgroup(path string) error {
controller, err := cgroups.NewSystemd(SystemdDefaultCgroupParent)
if err != nil {
return err
}
return controller.Delete(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
}
// GetV1CGroups gets the V1 cgroup subsystems and then "filters"
// out any subsystems that are provided by the caller. Passing nil
// for excludes will return the subsystems unfiltered.
//func GetV1CGroups(excludes []string) ([]cgroups.Subsystem, error) {
func GetV1CGroups(excludes []string) cgroups.Hierarchy {
return func() ([]cgroups.Subsystem, error) {
var filtered []cgroups.Subsystem
subSystem, err := cgroups.V1()
if err != nil {
return nil, err
}
for _, s := range subSystem {
// If the name of the subsystem is not in the list of excludes, then
// add it as a keeper.
if !util.StringInSlice(string(s.Name()), excludes) {
filtered = append(filtered, s)
}
}
return filtered, 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
}
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