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execdriver: Make GetPidsForContainer() a driver call

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The current implementation is lxc specific.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
This commit is contained in:
Alexander Larsson 2014-01-28 16:17:51 +01:00
parent 291f245f79
commit 455aa20483
1 changed files with 1 additions and 44 deletions
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45
cgroups/cgroups.go
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@ -5,10 +5,7 @@ import (
"fmt"
"github.com/dotcloud/docker/pkg/mount"
"io"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
)
@ -33,7 +30,7 @@ func FindCgroupMountpoint(subsystem string) (string, error) {
}
// Returns the relative path to the cgroup docker is running in.
func getThisCgroupDir(subsystem string) (string, error) {
func GetThisCgroupDir(subsystem string) (string, error) {
f, err := os.Open("/proc/self/cgroup")
if err != nil {
return "", err
@ -58,43 +55,3 @@ func parseCgroupFile(subsystem string, r io.Reader) (string, error) {
}
return "", fmt.Errorf("cgroup '%s' not found in /proc/self/cgroup", subsystem)
}
// Returns a list of pids for the given container.
func GetPidsForContainer(id string) ([]int, error) {
pids := []int{}
// memory is chosen randomly, any cgroup used by docker works
subsystem := "memory"
cgroupRoot, err := FindCgroupMountpoint(subsystem)
if err != nil {
return pids, err
}
cgroupDir, err := getThisCgroupDir(subsystem)
if err != nil {
return pids, err
}
filename := filepath.Join(cgroupRoot, cgroupDir, id, "tasks")
if _, err := os.Stat(filename); os.IsNotExist(err) {
// With more recent lxc versions use, cgroup will be in lxc/
filename = filepath.Join(cgroupRoot, cgroupDir, "lxc", id, "tasks")
}
output, err := ioutil.ReadFile(filename)
if err != nil {
return pids, err
}
for _, p := range strings.Split(string(output), "\n") {
if len(p) == 0 {
continue
}
pid, err := strconv.Atoi(p)
if err != nil {
return pids, fmt.Errorf("Invalid pid '%s': %s", p, err)
}
pids = append(pids, pid)
}
return pids, nil
}