Golang Hash.String方法代码示例

// CreateDepListFromImageID returns the flat dependency tree of the image with
// the provided imageID
func CreateDepListFromImageID(imageID types.Hash, ap ACIRegistry) (Images, error) {
	key, err := ap.ResolveKey(imageID.String())
	if err != nil {
		return nil, err
	}
	return createDepList(key, ap)
}

func (h *Host) getLocalImage(hash types.Hash, name types.ACIdentifier, labels types.Labels) (*Image, error) {
	if hash.Empty() && name.Empty() {
		return nil, errors.Trace(ErrUsage)
	}

	if !hash.Empty() {
		if idStr, err := os.Readlink(h.Path("images", hash.String())); os.IsNotExist(err) {
			return nil, ErrNotFound
		} else if err != nil {
			return nil, errors.Trace(err)
		} else if id := uuid.Parse(idStr); id == nil {
			return nil, errors.Errorf("Invalid UUID: %v", idStr)
		} else if img, err := LoadImage(h, id); err != nil {
			return nil, errors.Trace(err)
		} else {
			return img, nil
		}
	} else if imgs, err := h.Images(); err != nil {
		return nil, errors.Trace(err)
	} else {
		for _, img := range imgs {
			if img.Manifest.Name != name {
				continue
			}
			if !acutil.MatchLabels(labels, img.Manifest.Labels) {
				continue
			}
			// TODO: multiple matches?
			return img, nil
		}

		return nil, ErrNotFound
	}
}

// writeManifest takes an img ID and writes the corresponding manifest in dest
func writeManifest(cfg CommonConfig, img types.Hash, dest string) error {
	mb, err := cfg.Store.GetImageManifestJSON(img.String())
	if err != nil {
		return err
	}

	debug("Writing image manifest")
	if err := ioutil.WriteFile(filepath.Join(dest, "manifest"), mb, defaultRegularFilePerm); err != nil {
		return errwrap.Wrap(errors.New("error writing image manifest"), err)
	}

	return nil
}

// prepareStage1Image renders and verifies tree cache of the given hash
// when using overlay.
// When useOverlay is false, it attempts to render and expand the stage1.
func prepareStage1Image(cfg PrepareConfig, img types.Hash, cdir string, useOverlay bool) error {
	s1 := common.Stage1ImagePath(cdir)
	if err := os.MkdirAll(s1, defaultRegularDirPerm); err != nil {
		return errwrap.Wrap(errors.New("error creating stage1 directory"), err)
	}

	treeStoreID, _, err := cfg.Store.RenderTreeStore(img.String(), false)
	if err != nil {
		return errwrap.Wrap(errors.New("error rendering tree image"), err)
	}

	if !cfg.SkipTreeStoreCheck {
		hash, err := cfg.Store.CheckTreeStore(treeStoreID)
		if err != nil {
			log.Printf("warning: tree cache is in a bad state: %v. Rebuilding...", err)
			var err error
			treeStoreID, hash, err = cfg.Store.RenderTreeStore(img.String(), true)
			if err != nil {
				return errwrap.Wrap(errors.New("error rendering tree image"), err)
			}
		}
		cfg.CommonConfig.RootHash = hash
	}

	if err := writeManifest(*cfg.CommonConfig, img, s1); err != nil {
		return errwrap.Wrap(errors.New("error writing manifest"), err)
	}

	if !useOverlay {
		destRootfs := filepath.Join(s1, "rootfs")
		cachedTreePath := cfg.Store.GetTreeStoreRootFS(treeStoreID)
		if err := fileutil.CopyTree(cachedTreePath, destRootfs, cfg.PrivateUsers); err != nil {
			return errwrap.Wrap(errors.New("error rendering ACI"), err)
		}
	}

	fn := path.Join(cdir, common.Stage1TreeStoreIDFilename)
	if err := ioutil.WriteFile(fn, []byte(treeStoreID), defaultRegularFilePerm); err != nil {
		return errwrap.Wrap(errors.New("error writing stage1 treeStoreID"), err)
	}
	return nil
}

// prepareAppImage renders and verifies the tree cache of the app image that
// corresponds to the given app name.
// When useOverlay is false, it attempts to render and expand the app image
func prepareAppImage(cfg PrepareConfig, appName types.ACName, img types.Hash, cdir string, useOverlay bool) error {
	debug("Loading image %s", img.String())

	am, err := cfg.Store.GetImageManifest(img.String())
	if err != nil {
		return errwrap.Wrap(errors.New("error getting the manifest"), err)
	}

	if _, hasOS := am.Labels.Get("os"); !hasOS {
		return fmt.Errorf("missing os label in the image manifest")
	}
	if _, hasArch := am.Labels.Get("arch"); !hasArch {
		return fmt.Errorf("missing arch label in the image manifest")
	}

	if err := types.IsValidOSArch(am.Labels.ToMap(), ValidOSArch); err != nil {
		return err
	}

	appInfoDir := common.AppInfoPath(cdir, appName)
	if err := os.MkdirAll(appInfoDir, defaultRegularDirPerm); err != nil {
		return errwrap.Wrap(errors.New("error creating apps info directory"), err)
	}

	if useOverlay {
		if cfg.PrivateUsers.Shift > 0 {
			return fmt.Errorf("cannot use both overlay and user namespace: not implemented yet. (Try --no-overlay)")
		}
		treeStoreID, _, err := cfg.Store.RenderTreeStore(img.String(), false)
		if err != nil {
			return errwrap.Wrap(errors.New("error rendering tree image"), err)
		}

		if !cfg.SkipTreeStoreCheck {
			hash, err := cfg.Store.CheckTreeStore(treeStoreID)
			if err != nil {
				log.PrintE("warning: tree cache is in a bad state: %v. Rebuilding...", err)
				var err error
				treeStoreID, hash, err = cfg.Store.RenderTreeStore(img.String(), true)
				if err != nil {
					return errwrap.Wrap(errors.New("error rendering tree image"), err)
				}
			}
			cfg.CommonConfig.RootHash = hash
		}

		if err := ioutil.WriteFile(common.AppTreeStoreIDPath(cdir, appName), []byte(treeStoreID), defaultRegularFilePerm); err != nil {
			return errwrap.Wrap(errors.New("error writing app treeStoreID"), err)
		}
	} else {
		ad := common.AppPath(cdir, appName)
		err := os.MkdirAll(ad, defaultRegularDirPerm)
		if err != nil {
			return errwrap.Wrap(errors.New("error creating image directory"), err)
		}

		shiftedUid, shiftedGid, err := cfg.PrivateUsers.ShiftRange(uint32(os.Getuid()), uint32(os.Getgid()))
		if err != nil {
			return errwrap.Wrap(errors.New("error getting uid, gid"), err)
		}

		if err := os.Chown(ad, int(shiftedUid), int(shiftedGid)); err != nil {
			return errwrap.Wrap(fmt.Errorf("error shifting app %q's stage2 dir", appName), err)
		}

		if err := aci.RenderACIWithImageID(img, ad, cfg.Store, cfg.PrivateUsers); err != nil {
			return errwrap.Wrap(errors.New("error rendering ACI"), err)
		}
	}
	if err := writeManifest(*cfg.CommonConfig, img, appInfoDir); err != nil {
		return err
	}
	return nil
}

// TODO(iaguis): add override options for Exec, Environment (à la patch-manifest)
func AddApp(cfg RunConfig, dir string, img *types.Hash) error {
	im, err := cfg.Store.GetImageManifest(img.String())
	if err != nil {
		return err
	}
	appName, err := imageNameToAppName(im.Name)
	if err != nil {
		return err
	}

	p, err := stage1types.LoadPod(dir, cfg.UUID)
	if err != nil {
		return errwrap.Wrap(errors.New("error loading pod manifest"), err)
	}

	pm := p.Manifest

	var mutable bool
	ms, ok := pm.Annotations.Get("coreos.com/rkt/stage1/mutable")
	if ok {
		mutable, err = strconv.ParseBool(ms)
		if err != nil {
			return errwrap.Wrap(errors.New("error parsing mutable annotation"), err)
		}
	}

	if !mutable {
		return errors.New("immutable pod: cannot add application")
	}

	if pm.Apps.Get(*appName) != nil {
		return fmt.Errorf("error: multiple apps with name %s", *appName)
	}
	if im.App == nil {
		return fmt.Errorf("error: image %s has no app section)", img)
	}

	appInfoDir := common.AppInfoPath(dir, *appName)
	if err := os.MkdirAll(appInfoDir, common.DefaultRegularDirPerm); err != nil {
		return errwrap.Wrap(errors.New("error creating apps info directory"), err)
	}

	uidRange := user.NewBlankUidRange()
	// TODO(iaguis): DRY: refactor this
	var treeStoreID string
	if cfg.UseOverlay {
		treeStoreID, _, err := cfg.TreeStore.Render(img.String(), false)
		if err != nil {
			return errwrap.Wrap(errors.New("error rendering tree image"), err)
		}

		hash, err := cfg.TreeStore.Check(treeStoreID)
		if err != nil {
			log.PrintE("warning: tree cache is in a bad state.  Rebuilding...", err)
			var err error
			treeStoreID, hash, err = cfg.TreeStore.Render(img.String(), true)
			if err != nil {
				return errwrap.Wrap(errors.New("error rendering tree image"), err)
			}
		}
		cfg.RootHash = hash

		if err := ioutil.WriteFile(common.AppTreeStoreIDPath(dir, *appName), []byte(treeStoreID), common.DefaultRegularFilePerm); err != nil {
			return errwrap.Wrap(errors.New("error writing app treeStoreID"), err)
		}
	} else {
		ad := common.AppPath(dir, *appName)

		err := os.MkdirAll(ad, common.DefaultRegularDirPerm)
		if err != nil {
			return errwrap.Wrap(errors.New("error creating image directory"), err)
		}

		privateUsers, err := preparedWithPrivateUsers(dir)
		if err != nil {
			log.FatalE("error reading user namespace information", err)
		}

		if err := uidRange.Deserialize([]byte(privateUsers)); err != nil {
			return err
		}

		shiftedUid, shiftedGid, err := uidRange.ShiftRange(uint32(os.Getuid()), uint32(os.Getgid()))
		if err != nil {
			return errwrap.Wrap(errors.New("error getting uid, gid"), err)
		}

		if err := os.Chown(ad, int(shiftedUid), int(shiftedGid)); err != nil {
			return errwrap.Wrap(fmt.Errorf("error shifting app %q's stage2 dir", *appName), err)
		}

		if err := aci.RenderACIWithImageID(*img, ad, cfg.Store, uidRange); err != nil {
			return errwrap.Wrap(errors.New("error rendering ACI"), err)
		}
	}

	if err := writeManifest(*cfg.CommonConfig, *img, appInfoDir); err != nil {
		return errwrap.Wrap(errors.New("error writing manifest"), err)
	}
//.........这里部分代码省略.........