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03cdf6c4a9
virtcontainers/pkg/cgroups contains functions and structures needed to deal with cgroups and virtual containers Signed-off-by: Julio Montes <julio.montes@intel.com>
66 lines
2.0 KiB
Go
66 lines
2.0 KiB
Go
// Copyright (c) 2020 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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package cgroups
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import (
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"fmt"
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"path/filepath"
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"regexp"
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)
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// prepend a kata specific string to oci cgroup path to
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// form a different cgroup path, thus cAdvisor couldn't
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// find kata containers cgroup path on host to prevent it
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// from grabbing the stats data.
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const CgroupKataPrefix = "kata"
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// DefaultCgroupPath runtime-determined location in the cgroups hierarchy.
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const DefaultCgroupPath = "/vc"
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func RenameCgroupPath(path string) (string, error) {
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if path == "" {
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return "", fmt.Errorf("Cgroup path is empty")
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}
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cgroupPathDir := filepath.Dir(path)
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cgroupPathName := fmt.Sprintf("%s_%s", CgroupKataPrefix, filepath.Base(path))
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return filepath.Join(cgroupPathDir, cgroupPathName), nil
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}
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// validCgroupPath returns a valid cgroup path.
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// see https://github.com/opencontainers/runtime-spec/blob/master/config-linux.md#cgroups-path
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func ValidCgroupPath(path string, systemdCgroup bool) (string, error) {
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if IsSystemdCgroup(path) {
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return path, nil
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}
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if systemdCgroup {
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return "", fmt.Errorf("malformed systemd path '%v': expected to be of form 'slice:prefix:name'", path)
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}
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// In the case of an absolute path (starting with /), the runtime MUST
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// take the path to be relative to the cgroups mount point.
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if filepath.IsAbs(path) {
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return RenameCgroupPath(filepath.Clean(path))
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}
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// In the case of a relative path (not starting with /), the runtime MAY
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// interpret the path relative to a runtime-determined location in the cgroups hierarchy.
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// clean up path and return a new path relative to DefaultCgroupPath
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return RenameCgroupPath(filepath.Join(DefaultCgroupPath, filepath.Clean("/"+path)))
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}
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func IsSystemdCgroup(cgroupPath string) bool {
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// systemd cgroup path: slice:prefix:name
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re := regexp.MustCompile(`([[:alnum:]]|\.)+:([[:alnum:]]|\.)+:([[:alnum:]]|\.)+`)
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found := re.FindStringIndex(cgroupPath)
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// if found string is equal to cgroupPath then
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// it's a correct systemd cgroup path.
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return found != nil && cgroupPath[found[0]:found[1]] == cgroupPath
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}
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