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Merge pull request #603 from smarterclayton/lazily_init_systemd

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Lazily init DBus only when it is needed
This commit is contained in:
Vish Kannan 2015-03-19 15:16:24 -07:00
commit fb9b778b9f
1 changed files with 19 additions and 18 deletions
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37
container/docker/factory.go
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@ -21,6 +21,7 @@ import (
"regexp"
"strconv"
"strings"
"sync"
"github.com/docker/libcontainer/cgroups"
"github.com/docker/libcontainer/cgroups/systemd"
@ -43,23 +44,23 @@ var dockerRootDir = flag.String("docker_root", "/var/lib/docker", "Absolute path
// Whether the system is using Systemd.
var useSystemd bool
func init() {
useSystemd = systemd.UseSystemd()
if !useSystemd {
// Second attempt at checking for systemd, check for a "name=systemd" cgroup.
mnt, err := cgroups.FindCgroupMountpoint("cpu")
if err == nil {
// systemd presence does not mean systemd controls cgroups.
// If system.slice cgroup exists, then systemd is taking control.
// This breaks if user creates system.slice manually :)
useSystemd = utils.FileExists(mnt + "/system.slice")
}
}
}
var check = sync.Once{}
func UseSystemd() bool {
// init would run and initialize useSystemd before we can call this method.
check.Do(func() {
// run and initialize useSystemd
useSystemd = systemd.UseSystemd()
if !useSystemd {
// Second attempt at checking for systemd, check for a "name=systemd" cgroup.
mnt, err := cgroups.FindCgroupMountpoint("cpu")
if err == nil {
// systemd presence does not mean systemd controls cgroups.
// If system.slice cgroup exists, then systemd is taking control.
// This breaks if user creates system.slice manually :)
useSystemd = utils.FileExists(mnt + "/system.slice")
}
}
})
return useSystemd
}
@ -108,7 +109,7 @@ func ContainerNameToDockerId(name string) string {
id := path.Base(name)
// Turn systemd cgroup name into Docker ID.
if useSystemd {
if UseSystemd() {
id = strings.TrimPrefix(id, "docker-")
id = strings.TrimSuffix(id, ".scope")
}
@ -119,7 +120,7 @@ func ContainerNameToDockerId(name string) string {
// Returns a full container name for the specified Docker ID.
func FullContainerName(dockerId string) string {
// Add the full container name.
if useSystemd {
if UseSystemd() {
return path.Join("/system.slice", fmt.Sprintf("docker-%s.scope", dockerId))
} else {
return path.Join("/docker", dockerId)
@ -207,7 +208,7 @@ func Register(factory info.MachineInfoFactory, fsInfo fs.FsInfo) error {
}
}
if useSystemd {
if UseSystemd() {
glog.Infof("System is using systemd")
}