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Code Issues Releases Wiki Activity

Use a subdirectory of the state partition

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This commit is contained in:
Darren Shepherd
2015-12-19 22:34:07 -07:00
parent 9c6b16928a
commit 808fbdbe1f
7 changed files with 76 additions and 13 deletions
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27
init/root.go
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@@ -5,6 +5,7 @@ import (
"io/ioutil"
"os"
"path"
"strings"
"syscall"
log "github.com/Sirupsen/logrus"
@@ -84,7 +85,7 @@ func copyMoveRoot(rootfs string, rmUsr bool) error {
for _, file := range files {
filename := path.Join("/", file.Name())
if filename == rootfs {
if filename == rootfs || strings.HasPrefix(rootfs, filename+"/") {
log.Debugf("Skipping Deleting %s", filename)
continue
}
@@ -98,7 +99,23 @@ func copyMoveRoot(rootfs string, rmUsr bool) error {
return nil
}
func switchRoot(rootfs string, rmUsr bool) error {
func switchRoot(rootfs, subdir string, rmUsr bool) error {
if subdir != "" {
fullRootfs := path.Join(rootfs, subdir)
if _, err := os.Stat(fullRootfs); os.IsNotExist(err) {
if err := os.MkdirAll(fullRootfs, 0755); err != nil {
log.Errorf("Failed to create directory %s: %v", fullRootfs, err)
return err
}
}
log.Debugf("Bind mounting mount %s to %s", fullRootfs, rootfs)
if err := syscall.Mount(fullRootfs, rootfs, "", syscall.MS_BIND, ""); err != nil {
log.Errorf("Failed to bind mount subdir for %s: %v", fullRootfs, err)
return err
}
}
for _, i := range []string{"/dev", "/sys", "/proc", "/run"} {
log.Debugf("Moving mount %s to %s", i, path.Join(rootfs, i))
if err := os.MkdirAll(path.Join(rootfs, i), 0755); err != nil {
@@ -113,23 +130,27 @@ func switchRoot(rootfs string, rmUsr bool) error {
return err
}
log.Debugf("chdir %s", rootfs)
if err := syscall.Chdir(rootfs); err != nil {
return err
}
log.Debugf("mount MS_MOVE %s", rootfs)
if err := syscall.Mount(rootfs, "/", "", syscall.MS_MOVE, ""); err != nil {
return err
}
log.Debug("chroot .")
if err := syscall.Chroot("."); err != nil {
return err
}
log.Debug("chdir /")
if err := syscall.Chdir("/"); err != nil {
return err
}
log.Debugf("Successfully moved to new root at %s", rootfs)
log.Debugf("Successfully moved to new root at %s", path.Join(rootfs, subdir))
os.Unsetenv("DOCKER_RAMDISK")
return nil