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libcontainer: Initial version of cgroups support

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This is a minimal version of raw cgroup support for libcontainer.
It has only enough for what docker needs, and it has no support
for systemd yet.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
This commit is contained in:
Alexander Larsson 2014-02-20 23:12:08 +01:00 • committed by Michael Crosby
parent 8590435fa0
commit 3de41b34a2
6 changed files with 218 additions and 10 deletions
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16
cgroups/cgroups.go
View file

@ -40,6 +40,16 @@ func GetThisCgroupDir(subsystem string) (string, error) {
return parseCgroupFile(subsystem, f)
}
func GetInitCgroupDir(subsystem string) (string, error) {
f, err := os.Open("/proc/1/cgroup")
if err != nil {
return "", err
}
defer f.Close()
return parseCgroupFile(subsystem, f)
}
func parseCgroupFile(subsystem string, r io.Reader) (string, error) {
s := bufio.NewScanner(r)
@ -49,8 +59,10 @@ func parseCgroupFile(subsystem string, r io.Reader) (string, error) {
}
text := s.Text()
parts := strings.Split(text, ":")
if parts[1] == subsystem {
return parts[2], nil
for _, subs := range strings.Split(parts[1], ",") {
if subs == subsystem {
return parts[2], nil
}
}
}
return "", fmt.Errorf("cgroup '%s' not found in /proc/self/cgroup", subsystem)