func createFromCopy(d *Daemon, req *containerPostReq) Response {
if req.Source.Source == "" {
return BadRequest(fmt.Errorf("must specify a source container"))
}
// Make sure the source exists.
source, err := newLxdContainer(req.Source.Source, d)
if err != nil {
return SmartError(err)
}
if req.Config == nil {
config := make(map[string]string)
for key, value := range source.config {
if key[0:8] == "volatile" {
shared.Debugf("skipping: %s\n", key)
continue
}
req.Config[key] = value
}
req.Config = config
}
if req.Profiles == nil {
req.Profiles = source.profiles
}
args := DbCreateContainerArgs{
d: d,
name: req.Name,
ctype: cTypeRegular,
config: req.Config,
profiles: req.Profiles,
ephem: req.Ephemeral,
baseImage: req.Source.BaseImage,
}
_, err = dbCreateContainer(args)
if err != nil {
return SmartError(err)
}
var oldPath string
if shared.IsSnapshot(req.Source.Source) {
snappieces := strings.SplitN(req.Source.Source, "/", 2)
oldPath = migration.AddSlash(shared.VarPath("lxc",
snappieces[0],
"snapshots",
snappieces[1],
"rootfs"))
} else {
oldPath = migration.AddSlash(shared.VarPath("lxc", req.Source.Source, "rootfs"))
}
subvol := strings.TrimSuffix(oldPath, "rootfs/")
dpath := shared.VarPath("lxc", req.Name) // Destination path
if !btrfsIsSubvolume(subvol) {
if err := os.MkdirAll(dpath, 0700); err != nil {
removeContainer(d, req.Name)
return InternalError(err)
}
if err := extractShiftIfExists(d, source, req.Source.BaseImage, req.Name); err != nil {
removeContainer(d, req.Name)
return InternalError(err)
}
}
newPath := fmt.Sprintf("%s/%s", dpath, "rootfs")
run := func() shared.OperationResult {
if btrfsIsSubvolume(subvol) {
/*
* Copy by using btrfs snapshot
*/
output, err := btrfsSnapshot(subvol, dpath, false)
if err != nil {
shared.Debugf("Failed to create a BTRFS Snapshot of '%s' to '%s'.", subvol, dpath)
shared.Debugf(string(output))
return shared.OperationError(err)
}
} else {
/*
* Copy by using rsync
*/
output, err := exec.Command("rsync", "-a", "--devices", oldPath, newPath).CombinedOutput()
if err != nil {
shared.Debugf("rsync failed:\n%s", output)
return shared.OperationError(err)
}
}
if !source.isPrivileged() {
err = setUnprivUserAcl(source, dpath)
if err != nil {
shared.Debugf("Error adding acl for container root: falling back to chmod\n")
output, err := exec.Command("chmod", "+x", dpath).CombinedOutput()
if err != nil {
shared.Debugf("Error chmoding the container root\n")
shared.Debugf(string(output))
return shared.OperationError(err)
}
}
}
c, err := newLxdContainer(req.Name, d)
if err != nil {
return shared.OperationError(err)
}
err = templateApply(c, "copy")
if err != nil {
return shared.OperationError(err)
}
return shared.OperationError(nil)
}
resources := make(map[string][]string)
resources["containers"] = []string{req.Name, req.Source.Source}
return &asyncResponse{run: run, resources: resources}
}
func containerSnapRestore(d *Daemon, name string, snap string) error {
// normalize snapshot name
if !shared.IsSnapshot(snap) {
snap = fmt.Sprintf("%s/%s", name, snap)
}
shared.Debugf("RESTORE => Restoring snapshot [%s] on container [%s]", snap, name)
/*
* restore steps:
* 1. stop container if already running
* 2. overwrite existing config with snapshot config
* 3. copy snapshot rootfs to container
*/
wasRunning := false
c, err := newLxdContainer(name, d)
if err != nil {
shared.Debugf("RESTORE => Error: newLxdContainer() failed for container", err)
return err
}
// 1. stop container
// TODO: stateful restore ?
if c.c.Running() {
wasRunning = true
if err = c.Stop(); err != nil {
shared.Debugf("RESTORE => Error: could not stop container", err)
return err
}
shared.Debugf("RESTORE => Stopped container %s", name)
}
// 2, replace config
// Make sure the source exists.
source, err := newLxdContainer(snap, d)
if err != nil {
shared.Debugf("RESTORE => Error: newLxdContainer() failed for snapshot", err)
return err
}
newConfig := containerConfigReq{}
newConfig.Config = source.config
newConfig.Profiles = source.profiles
newConfig.Devices = source.devices
err = containerReplaceConfig(d, c, name, newConfig)
if err != nil {
shared.Debugf("RESTORE => err #4", err)
return err
}
// 3. copy rootfs
// TODO: btrfs optimizations
containerRootPath := shared.VarPath("lxc", name)
if !shared.IsDir(path.Dir(containerRootPath)) {
shared.Debugf("RESTORE => containerRoot [%s] directory does not exist", containerRootPath)
return os.ErrNotExist
}
var snapshotRootFSPath string
snapshotRootFSPath = migration.AddSlash(snapshotRootfsDir(c, strings.SplitN(snap, "/", 2)[1]))
containerRootFSPath := migration.AddSlash(fmt.Sprintf("%s/%s", containerRootPath, "rootfs"))
shared.Debugf("RESTORE => Copying %s to %s", snapshotRootFSPath, containerRootFSPath)
rsyncVerbosity := "-q"
if *debug {
rsyncVerbosity = "-vi"
}
output, err := exec.Command("rsync", "-a", "-c", "-HAX", "--devices", "--delete", rsyncVerbosity, snapshotRootFSPath, containerRootFSPath).CombinedOutput()
shared.Debugf("RESTORE => rsync output\n%s", output)
if err == nil && !source.isPrivileged() {
err = setUnprivUserAcl(c, containerRootPath)
if err != nil {
shared.Debugf("Error adding acl for container root: falling back to chmod\n")
output, err := exec.Command("chmod", "+x", containerRootPath).CombinedOutput()
if err != nil {
shared.Debugf("Error chmoding the container root\n")
shared.Debugf(string(output))
return err
}
}
} else {
shared.Debugf("rsync failed:\n%s", output)
return err
}
if wasRunning {
c.Start()
}
return nil
}
