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package path
import (
"errors"
"os"
"path/filepath"
"github.com/opencontainers/cgroups"
)
// Inner returns a path to cgroup relative to a cgroup mount point, based
// on cgroup configuration, or an error, if cgroup configuration is invalid.
// To be used only by fs cgroup managers (systemd has different path rules).
func Inner(c *cgroups.Cgroup) (string, error) {
if (c.Name != "" || c.Parent != "") && c.Path != "" {
return "", errors.New("cgroup: either Path or Name and Parent should be used")
}
// XXX: Do not remove cleanPath. Path safety is important! -- cyphar
innerPath := cleanPath(c.Path)
if innerPath == "" {
cgParent := cleanPath(c.Parent)
cgName := cleanPath(c.Name)
innerPath = filepath.Join(cgParent, cgName)
}
return innerPath, nil
}
// cleanPath is a copy of github.com/opencontainers/runc/libcontainer/utils.CleanPath.
func cleanPath(path string) string {
// Deal with empty strings nicely.
if path == "" {
return ""
}
// Ensure that all paths are cleaned (especially problematic ones like
// "/../../../../../" which can cause lots of issues).
if filepath.IsAbs(path) {
return filepath.Clean(path)
}
// If the path isn't absolute, we need to do more processing to fix paths
// such as "../../../../<etc>/some/path". We also shouldn't convert absolute
// paths to relative ones.
path = filepath.Clean(string(os.PathSeparator) + path)
// This can't fail, as (by definition) all paths are relative to root.
path, _ = filepath.Rel(string(os.PathSeparator), path)
return path
}
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