diff options
Diffstat (limited to 'libpod/container.go')
| -rw-r--r-- | libpod/container.go | 55 |
1 files changed, 15 insertions, 40 deletions
diff --git a/libpod/container.go b/libpod/container.go index 580fa7b3d..333e1d848 100644 --- a/libpod/container.go +++ b/libpod/container.go @@ -1,22 +1,18 @@ package libpod import ( + "bytes" "fmt" "io/ioutil" "net" "os" - "path/filepath" - "strings" "time" "github.com/containernetworking/cni/pkg/types" cnitypes "github.com/containernetworking/cni/pkg/types/current" - "github.com/containers/common/pkg/config" "github.com/containers/image/v5/manifest" "github.com/containers/podman/v2/libpod/define" "github.com/containers/podman/v2/libpod/lock" - "github.com/containers/podman/v2/pkg/rootless" - "github.com/containers/podman/v2/utils" "github.com/containers/storage" "github.com/cri-o/ocicni/pkg/ocicni" spec "github.com/opencontainers/runtime-spec/specs-go" @@ -912,44 +908,23 @@ func (c *Container) CgroupManager() string { // CGroupPath returns a cgroups "path" for a given container. func (c *Container) CGroupPath() (string, error) { - cgroupManager := c.CgroupManager() - - switch { - case c.config.NoCgroups || c.config.CgroupsMode == "disabled": + if c.config.NoCgroups || c.config.CgroupsMode == "disabled" { return "", errors.Wrapf(define.ErrNoCgroups, "this container is not creating cgroups") - case c.config.CgroupsMode == cgroupSplit: - if c.config.CgroupParent != "" { - return "", errors.Errorf("cannot specify cgroup-parent with cgroup-mode %q", cgroupSplit) - } - cg, err := utils.GetCgroupProcess(c.state.ConmonPID) - if err != nil { - return "", err - } - // Use the conmon cgroup for two reasons: we validate the container - // delegation was correct, and the conmon cgroup doesn't change at runtime - // while we are not sure about the container that can create sub cgroups. - if !strings.HasSuffix(cg, "supervisor") { - return "", errors.Errorf("invalid cgroup for conmon %q", cg) - } - return strings.TrimSuffix(cg, "/supervisor") + "/container", nil - case cgroupManager == config.CgroupfsCgroupsManager: - return filepath.Join(c.config.CgroupParent, fmt.Sprintf("libpod-%s", c.ID())), nil - case cgroupManager == config.SystemdCgroupsManager: - if rootless.IsRootless() { - uid := rootless.GetRootlessUID() - parts := strings.SplitN(c.config.CgroupParent, "/", 2) - - dir := "" - if len(parts) > 1 { - dir = parts[1] - } + } - return filepath.Join(parts[0], fmt.Sprintf("user-%d.slice/user@%d.service/user.slice/%s", uid, uid, dir), createUnitName("libpod", c.ID())), nil - } - return filepath.Join(c.config.CgroupParent, createUnitName("libpod", c.ID())), nil - default: - return "", errors.Wrapf(define.ErrInvalidArg, "unsupported CGroup manager %s in use", cgroupManager) + // Read /proc/[PID]/cgroup and look at the first line. cgroups(7) + // nails it down to three fields with the 3rd pointing to the cgroup's + // path which works both on v1 and v2. + procPath := fmt.Sprintf("/proc/%d/cgroup", c.state.PID) + lines, err := ioutil.ReadFile(procPath) + if err != nil { + return "", err + } + fields := bytes.Split(bytes.Split(lines, []byte("\n"))[0], []byte(":")) + if len(fields) != 3 { + return "", errors.Errorf("expected 3 fields but got %d: %s", len(fields), procPath) } + return string(fields[2]), nil } // RootFsSize returns the root FS size of the container |