示例#1
0
文件: image_gc.go 项目: nak3/rkt
// gcTreeStore removes all treeStoreIDs not referenced by any non garbage
// collected pod from the store.
func gcTreeStore(ts *treestore.Store) error {
	// Take an exclusive lock to block other pods being created.
	// This is needed to avoid races between the below steps (getting the
	// list of referenced treeStoreIDs, getting the list of treeStoreIDs
	// from the store, removal of unreferenced treeStoreIDs) and new
	// pods/treeStores being created/referenced
	keyLock, err := lock.ExclusiveKeyLock(lockDir(), common.PrepareLock)
	if err != nil {
		return errwrap.Wrap(errors.New("cannot get exclusive prepare lock"), err)
	}
	defer keyLock.Close()
	referencedTreeStoreIDs, err := getReferencedTreeStoreIDs()
	if err != nil {
		return errwrap.Wrap(errors.New("cannot get referenced treestoreIDs"), err)
	}
	treeStoreIDs, err := ts.GetIDs()
	if err != nil {
		return errwrap.Wrap(errors.New("cannot get treestoreIDs from the store"), err)
	}
	for _, treeStoreID := range treeStoreIDs {
		if _, ok := referencedTreeStoreIDs[treeStoreID]; !ok {
			if err := ts.Remove(treeStoreID); err != nil {
				stderr.PrintE(fmt.Sprintf("error removing treestore %q", treeStoreID), err)
			} else {
				stderr.Printf("removed treestore %q", treeStoreID)
			}
		}
	}
	return nil
}
示例#2
0
文件: gc.go 项目: nhlfr/rkt
func mountPodStage1(ts *treestore.Store, p *pkgPod.Pod) error {
	if !p.UsesOverlay() {
		return nil
	}

	s1Id, err := p.GetStage1TreeStoreID()
	if err != nil {
		return errwrap.Wrap(errors.New("error getting stage1 treeStoreID"), err)
	}
	s1rootfs := ts.GetRootFS(s1Id)

	stage1Dir := common.Stage1RootfsPath(p.Path())
	overlayDir := filepath.Join(p.Path(), "overlay")
	imgDir := filepath.Join(overlayDir, s1Id)
	upperDir := filepath.Join(imgDir, "upper")
	workDir := filepath.Join(imgDir, "work")

	opts := fmt.Sprintf("lowerdir=%s,upperdir=%s,workdir=%s", s1rootfs, upperDir, workDir)
	if err := syscall.Mount("overlay", stage1Dir, "overlay", 0, opts); err != nil {
		return errwrap.Wrap(errors.New("error mounting stage1"), err)
	}

	return nil
}