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-rw-r--r--libpod/util_linux.go69
1 files changed, 69 insertions, 0 deletions
diff --git a/libpod/util_linux.go b/libpod/util_linux.go
new file mode 100644
index 000000000..0cd486379
--- /dev/null
+++ b/libpod/util_linux.go
@@ -0,0 +1,69 @@
+// +build linux
+
+package libpod
+
+import (
+ "fmt"
+ "strings"
+
+ "github.com/containerd/cgroups"
+ spec "github.com/opencontainers/runtime-spec/specs-go"
+ "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(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
+}