2013-03-21 20:47:23 -04:00
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package docker
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2013-03-18 03:15:35 -04:00
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import (
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"fmt"
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2013-10-31 19:57:45 -04:00
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"github.com/dotcloud/docker/archive"
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2013-11-07 15:34:01 -05:00
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"github.com/dotcloud/docker/graphdriver"
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2013-05-14 18:37:35 -04:00
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"github.com/dotcloud/docker/utils"
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2013-05-06 14:06:44 -04:00
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"io"
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2013-03-18 03:15:35 -04:00
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"io/ioutil"
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"os"
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"path"
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"path/filepath"
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2013-03-26 08:28:17 -04:00
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"strings"
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2013-11-12 19:59:37 -05:00
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"syscall"
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2013-03-18 03:15:35 -04:00
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"time"
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)
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2013-03-30 03:22:24 -04:00
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// A Graph is a store for versioned filesystem images and the relationship between them.
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2013-03-18 03:15:35 -04:00
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type Graph struct {
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2013-07-17 15:13:22 -04:00
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Root string
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idIndex *utils.TruncIndex
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2013-11-04 18:22:34 -05:00
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driver graphdriver.Driver
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2013-03-18 03:15:35 -04:00
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}
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2013-03-30 03:22:24 -04:00
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// NewGraph instantiates a new graph at the given root path in the filesystem.
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2013-03-30 00:13:59 -04:00
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// `root` will be created if it doesn't exist.
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2013-11-07 15:34:01 -05:00
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func NewGraph(root string, driver graphdriver.Driver) (*Graph, error) {
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2013-03-18 03:15:35 -04:00
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abspath, err := filepath.Abs(root)
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if err != nil {
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return nil, err
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}
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// Create the root directory if it doesn't exists
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2013-05-08 19:22:12 -04:00
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if err := os.MkdirAll(root, 0700); err != nil && !os.IsExist(err) {
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2013-03-18 03:15:35 -04:00
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return nil, err
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}
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2013-11-04 18:22:34 -05:00
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2013-04-01 01:11:55 -04:00
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graph := &Graph{
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2013-07-17 15:13:22 -04:00
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Root: abspath,
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idIndex: utils.NewTruncIndex(),
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2013-11-04 18:22:34 -05:00
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driver: driver,
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2013-04-01 01:11:55 -04:00
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}
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if err := graph.restore(); err != nil {
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return nil, err
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}
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return graph, nil
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}
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func (graph *Graph) restore() error {
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dir, err := ioutil.ReadDir(graph.Root)
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if err != nil {
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return err
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}
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for _, v := range dir {
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id := v.Name()
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2013-11-19 05:32:08 -05:00
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if graph.driver.Exists(id) {
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graph.idIndex.Add(id)
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}
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2013-04-01 01:11:55 -04:00
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}
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return nil
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2013-03-18 03:15:35 -04:00
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}
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2013-03-26 08:28:17 -04:00
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// FIXME: Implement error subclass instead of looking at the error text
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// Note: This is the way golang implements os.IsNotExists on Plan9
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func (graph *Graph) IsNotExist(err error) bool {
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2013-05-09 12:57:47 -04:00
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return err != nil && (strings.Contains(err.Error(), "does not exist") || strings.Contains(err.Error(), "No such"))
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2013-03-26 08:28:17 -04:00
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}
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2013-03-30 00:13:59 -04:00
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// Exists returns true if an image is registered at the given id.
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// If the image doesn't exist or if an error is encountered, false is returned.
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2013-03-18 03:15:35 -04:00
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func (graph *Graph) Exists(id string) bool {
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if _, err := graph.Get(id); err != nil {
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return false
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}
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return true
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}
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2013-03-30 00:13:59 -04:00
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// Get returns the image with the given id, or an error if the image doesn't exist.
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2013-04-01 01:11:55 -04:00
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func (graph *Graph) Get(name string) (*Image, error) {
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id, err := graph.idIndex.Get(name)
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if err != nil {
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return nil, err
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}
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2013-03-21 22:01:55 -04:00
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// FIXME: return nil when the image doesn't exist, instead of an error
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2013-03-18 03:15:35 -04:00
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img, err := LoadImage(graph.imageRoot(id))
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if err != nil {
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return nil, err
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}
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2013-11-07 15:34:01 -05:00
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// Check that the filesystem layer exists
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rootfs, err := graph.driver.Get(img.ID)
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if err != nil {
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return nil, fmt.Errorf("Driver %s failed to get image rootfs %s: %s", graph.driver, img.ID, err)
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}
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2013-06-04 14:00:22 -04:00
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if img.ID != id {
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return nil, fmt.Errorf("Image stored at '%s' has wrong id '%s'", id, img.ID)
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2013-03-18 03:15:35 -04:00
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}
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2013-05-24 09:03:09 -04:00
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img.graph = graph
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2013-05-13 09:10:26 -04:00
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if img.Size == 0 {
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2013-11-07 15:34:01 -05:00
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size, err := utils.TreeSize(rootfs)
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2013-05-13 09:10:26 -04:00
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if err != nil {
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2013-11-07 15:34:01 -05:00
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return nil, fmt.Errorf("Error computing size of rootfs %s: %s", img.ID, err)
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2013-05-13 09:10:26 -04:00
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}
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2013-11-07 15:34:01 -05:00
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img.Size = size
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if err := img.SaveSize(graph.imageRoot(id)); err != nil {
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2013-05-13 09:10:26 -04:00
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return nil, err
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}
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}
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2013-03-18 03:15:35 -04:00
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return img, nil
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}
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2013-03-30 00:13:59 -04:00
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// Create creates a new image and registers it in the graph.
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2013-10-31 19:57:45 -04:00
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func (graph *Graph) Create(layerData archive.Archive, container *Container, comment, author string, config *Config) (*Image, error) {
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2013-03-18 03:15:35 -04:00
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img := &Image{
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2013-06-04 14:00:22 -04:00
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ID: GenerateID(),
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2013-04-04 21:38:43 -04:00
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Comment: comment,
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2013-11-21 19:41:41 -05:00
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Created: time.Now().UTC(),
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2013-04-04 21:38:43 -04:00
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DockerVersion: VERSION,
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2013-04-17 22:58:17 -04:00
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Author: author,
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2013-04-25 19:48:31 -04:00
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Config: config,
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2013-05-24 14:42:09 -04:00
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Architecture: "x86_64",
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2013-03-18 03:15:35 -04:00
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}
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2013-03-22 00:13:27 -04:00
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if container != nil {
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img.Parent = container.Image
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2013-06-04 14:00:22 -04:00
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img.Container = container.ID
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2013-03-23 17:48:16 -04:00
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img.ContainerConfig = *container.Config
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2013-03-22 00:13:27 -04:00
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}
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2013-07-22 18:44:55 -04:00
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if err := graph.Register(nil, layerData, img); err != nil {
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2013-03-18 03:15:35 -04:00
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return nil, err
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}
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return img, nil
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}
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2013-03-30 00:13:59 -04:00
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// Register imports a pre-existing image into the graph.
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// FIXME: pass img as first argument
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2013-11-25 23:48:34 -05:00
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func (graph *Graph) Register(jsonData []byte, layerData archive.Archive, img *Image) (err error) {
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defer func() {
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// If any error occurs, remove the new dir from the driver.
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// Don't check for errors since the dir might not have been created.
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// FIXME: this leaves a possible race condition.
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if err != nil {
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graph.driver.Remove(img.ID)
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}
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}()
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2013-06-04 14:00:22 -04:00
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if err := ValidateID(img.ID); err != nil {
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2013-03-18 03:15:35 -04:00
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return err
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}
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// (This is a convenience to save time. Race conditions are taken care of by os.Rename)
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2013-06-04 14:00:22 -04:00
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if graph.Exists(img.ID) {
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return fmt.Errorf("Image %s already exists", img.ID)
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2013-03-18 03:15:35 -04:00
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}
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2013-11-19 05:32:08 -05:00
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// Ensure that the image root does not exist on the filesystem
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// when it is not registered in the graph.
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// This is common when you switch from one graph driver to another
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if err := os.RemoveAll(graph.imageRoot(img.ID)); err != nil && !os.IsNotExist(err) {
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return err
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}
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2013-11-25 23:48:34 -05:00
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// If the driver has this ID but the graph doesn't, remove it from the driver to start fresh.
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// (the graph is the source of truth).
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// Ignore errors, since we don't know if the driver correctly returns ErrNotExist.
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// (FIXME: make that mandatory for drivers).
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graph.driver.Remove(img.ID)
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2013-04-17 19:35:22 -04:00
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tmp, err := graph.Mktemp("")
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2013-03-18 03:15:35 -04:00
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defer os.RemoveAll(tmp)
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if err != nil {
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return fmt.Errorf("Mktemp failed: %s", err)
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}
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2013-11-07 15:34:01 -05:00
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// Create root filesystem in the driver
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if err := graph.driver.Create(img.ID, img.Parent); err != nil {
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return fmt.Errorf("Driver %s failed to create image rootfs %s: %s", graph.driver, img.ID, err)
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}
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// Mount the root filesystem so we can apply the diff/layer
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rootfs, err := graph.driver.Get(img.ID)
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if err != nil {
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return fmt.Errorf("Driver %s failed to get image rootfs %s: %s", graph.driver, img.ID, err)
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}
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2013-11-11 20:17:38 -05:00
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img.graph = graph
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2013-11-07 15:34:01 -05:00
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if err := StoreImage(img, jsonData, layerData, tmp, rootfs); err != nil {
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2013-03-18 03:15:35 -04:00
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return err
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}
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// Commit
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2013-06-04 14:00:22 -04:00
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if err := os.Rename(tmp, graph.imageRoot(img.ID)); err != nil {
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2013-03-18 03:15:35 -04:00
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return err
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}
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2013-06-04 14:00:22 -04:00
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graph.idIndex.Add(img.ID)
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2013-03-18 03:15:35 -04:00
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return nil
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}
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2013-04-21 17:23:55 -04:00
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// TempLayerArchive creates a temporary archive of the given image's filesystem layer.
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// The archive is stored on disk and will be automatically deleted as soon as has been read.
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2013-04-21 18:29:26 -04:00
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// If output is not nil, a human-readable progress bar will be written to it.
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// FIXME: does this belong in Graph? How about MktempFile, let the caller use it for archives?
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2013-10-31 19:57:45 -04:00
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func (graph *Graph) TempLayerArchive(id string, compression archive.Compression, sf *utils.StreamFormatter, output io.Writer) (*archive.TempArchive, error) {
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2013-04-21 17:23:55 -04:00
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image, err := graph.Get(id)
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if err != nil {
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return nil, err
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}
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2013-11-07 15:34:01 -05:00
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tmp, err := graph.Mktemp("")
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2013-04-21 17:23:55 -04:00
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if err != nil {
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return nil, err
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}
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2013-11-20 18:37:26 -05:00
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a, err := image.TarLayer()
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2013-04-21 17:23:55 -04:00
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if err != nil {
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return nil, err
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}
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2013-11-28 15:16:57 -05:00
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return archive.NewTempArchive(utils.ProgressReader(ioutil.NopCloser(a), 0, output, sf, true, "", "Buffering to disk"), tmp)
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2013-04-21 17:23:55 -04:00
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}
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2013-03-30 00:13:59 -04:00
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// Mktemp creates a temporary sub-directory inside the graph's filesystem.
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2013-03-18 03:15:35 -04:00
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func (graph *Graph) Mktemp(id string) (string, error) {
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2013-11-08 19:53:58 -05:00
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dir := path.Join(graph.Root, "_tmp", GenerateID())
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if err := os.MkdirAll(dir, 0700); err != nil {
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return "", err
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2013-03-18 03:15:35 -04:00
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}
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2013-11-07 15:34:01 -05:00
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return dir, nil
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2013-03-18 03:15:35 -04:00
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}
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2013-11-07 15:34:01 -05:00
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// setupInitLayer populates a directory with mountpoints suitable
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2013-06-14 19:56:08 -04:00
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// for bind-mounting dockerinit into the container. The mountpoint is simply an
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// empty file at /.dockerinit
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//
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// This extra layer is used by all containers as the top-most ro layer. It protects
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// the container from unwanted side-effects on the rw layer.
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2013-11-07 15:34:01 -05:00
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func setupInitLayer(initLayer string) error {
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2013-08-08 14:25:02 -04:00
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for pth, typ := range map[string]string{
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"/dev/pts": "dir",
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"/dev/shm": "dir",
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"/proc": "dir",
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"/sys": "dir",
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"/.dockerinit": "file",
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2013-08-13 18:40:23 -04:00
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"/.dockerenv": "file",
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2013-08-08 14:25:02 -04:00
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"/etc/resolv.conf": "file",
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2013-09-09 15:40:25 -04:00
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"/etc/hosts": "file",
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"/etc/hostname": "file",
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2013-08-08 14:25:02 -04:00
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// "var/run": "dir",
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// "var/lock": "dir",
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} {
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2013-11-12 19:59:37 -05:00
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parts := strings.Split(pth, "/")
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prev := "/"
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for _, p := range parts[1:] {
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prev = path.Join(prev, p)
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syscall.Unlink(path.Join(initLayer, prev))
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}
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2013-08-08 14:25:02 -04:00
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if _, err := os.Stat(path.Join(initLayer, pth)); err != nil {
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if os.IsNotExist(err) {
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switch typ {
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case "dir":
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if err := os.MkdirAll(path.Join(initLayer, pth), 0755); err != nil {
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2013-11-07 15:34:01 -05:00
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return err
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2013-08-08 14:25:02 -04:00
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}
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case "file":
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if err := os.MkdirAll(path.Join(initLayer, path.Dir(pth)), 0755); err != nil {
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2013-11-07 15:34:01 -05:00
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return err
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2013-08-08 14:25:02 -04:00
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}
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2013-11-18 18:35:56 -05:00
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f, err := os.OpenFile(path.Join(initLayer, pth), os.O_CREATE, 0755)
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if err != nil {
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2013-11-07 15:34:01 -05:00
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return err
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2013-08-08 14:25:02 -04:00
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}
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2013-11-18 18:35:56 -05:00
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f.Close()
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2013-08-08 14:25:02 -04:00
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}
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} else {
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2013-11-07 15:34:01 -05:00
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return err
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2013-08-08 14:25:02 -04:00
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}
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}
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2013-06-14 19:56:08 -04:00
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}
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2013-08-08 14:25:02 -04:00
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2013-06-14 19:56:08 -04:00
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// Layer is ready to use, if it wasn't before.
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2013-11-07 15:34:01 -05:00
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return nil
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2013-04-21 17:23:55 -04:00
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}
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2013-03-30 03:22:24 -04:00
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// Check if given error is "not empty".
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// Note: this is the way golang does it internally with os.IsNotExists.
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2013-03-26 06:33:47 -04:00
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func isNotEmpty(err error) bool {
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switch pe := err.(type) {
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case nil:
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return false
|
|
|
|
case *os.PathError:
|
|
|
|
err = pe.Err
|
|
|
|
case *os.LinkError:
|
|
|
|
err = pe.Err
|
|
|
|
}
|
|
|
|
return strings.Contains(err.Error(), " not empty")
|
|
|
|
}
|
|
|
|
|
2013-03-30 00:13:59 -04:00
|
|
|
// Delete atomically removes an image from the graph.
|
2013-04-01 19:04:44 -04:00
|
|
|
func (graph *Graph) Delete(name string) error {
|
|
|
|
id, err := graph.idIndex.Get(name)
|
|
|
|
if err != nil {
|
|
|
|
return err
|
|
|
|
}
|
2013-04-04 01:14:28 -04:00
|
|
|
tmp, err := graph.Mktemp("")
|
2013-03-18 03:15:35 -04:00
|
|
|
if err != nil {
|
|
|
|
return err
|
|
|
|
}
|
2013-04-01 01:11:55 -04:00
|
|
|
graph.idIndex.Delete(id)
|
2013-04-04 01:14:28 -04:00
|
|
|
err = os.Rename(graph.imageRoot(id), tmp)
|
2013-03-18 03:15:35 -04:00
|
|
|
if err != nil {
|
|
|
|
return err
|
|
|
|
}
|
2013-11-07 15:34:01 -05:00
|
|
|
// Remove rootfs data from the driver
|
|
|
|
graph.driver.Remove(id)
|
|
|
|
// Remove the trashed image directory
|
2013-04-04 01:14:28 -04:00
|
|
|
return os.RemoveAll(tmp)
|
2013-03-18 03:15:35 -04:00
|
|
|
}
|
|
|
|
|
2013-03-30 03:22:24 -04:00
|
|
|
// Map returns a list of all images in the graph, addressable by ID.
|
2013-03-21 20:35:49 -04:00
|
|
|
func (graph *Graph) Map() (map[string]*Image, error) {
|
2013-08-31 23:31:21 -04:00
|
|
|
images := make(map[string]*Image)
|
2013-08-31 23:34:51 -04:00
|
|
|
err := graph.walkAll(func(image *Image) {
|
2013-08-31 23:31:21 -04:00
|
|
|
images[image.ID] = image
|
|
|
|
})
|
2013-03-21 20:35:49 -04:00
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
return images, nil
|
|
|
|
}
|
|
|
|
|
2013-08-31 23:34:51 -04:00
|
|
|
// walkAll iterates over each image in the graph, and passes it to a handler.
|
2013-03-30 00:13:59 -04:00
|
|
|
// The walking order is undetermined.
|
2013-08-31 23:34:51 -04:00
|
|
|
func (graph *Graph) walkAll(handler func(*Image)) error {
|
2013-03-18 03:15:35 -04:00
|
|
|
files, err := ioutil.ReadDir(graph.Root)
|
|
|
|
if err != nil {
|
2013-03-23 20:03:30 -04:00
|
|
|
return err
|
2013-03-18 03:15:35 -04:00
|
|
|
}
|
|
|
|
for _, st := range files {
|
|
|
|
if img, err := graph.Get(st.Name()); err != nil {
|
|
|
|
// Skip image
|
|
|
|
continue
|
2013-03-23 20:03:30 -04:00
|
|
|
} else if handler != nil {
|
|
|
|
handler(img)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2013-03-30 00:13:59 -04:00
|
|
|
// ByParent returns a lookup table of images by their parent.
|
|
|
|
// If an image of id ID has 3 children images, then the value for key ID
|
|
|
|
// will be a list of 3 images.
|
|
|
|
// If an image has no children, it will not have an entry in the table.
|
2013-03-23 20:03:30 -04:00
|
|
|
func (graph *Graph) ByParent() (map[string][]*Image, error) {
|
|
|
|
byParent := make(map[string][]*Image)
|
2013-08-31 23:34:51 -04:00
|
|
|
err := graph.walkAll(func(image *Image) {
|
2013-05-07 00:31:59 -04:00
|
|
|
parent, err := graph.Get(image.Parent)
|
2013-03-23 20:03:30 -04:00
|
|
|
if err != nil {
|
|
|
|
return
|
|
|
|
}
|
2013-06-04 14:00:22 -04:00
|
|
|
if children, exists := byParent[parent.ID]; exists {
|
|
|
|
byParent[parent.ID] = append(children, image)
|
2013-08-11 03:37:16 -04:00
|
|
|
} else {
|
|
|
|
byParent[parent.ID] = []*Image{image}
|
2013-03-18 03:15:35 -04:00
|
|
|
}
|
2013-03-23 20:03:30 -04:00
|
|
|
})
|
|
|
|
return byParent, err
|
|
|
|
}
|
|
|
|
|
2013-03-30 00:13:59 -04:00
|
|
|
// Heads returns all heads in the graph, keyed by id.
|
|
|
|
// A head is an image which is not the parent of another image in the graph.
|
2013-03-23 20:03:30 -04:00
|
|
|
func (graph *Graph) Heads() (map[string]*Image, error) {
|
|
|
|
heads := make(map[string]*Image)
|
|
|
|
byParent, err := graph.ByParent()
|
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
2013-03-18 03:15:35 -04:00
|
|
|
}
|
2013-08-31 23:34:51 -04:00
|
|
|
err = graph.walkAll(func(image *Image) {
|
2013-03-23 20:03:30 -04:00
|
|
|
// If it's not in the byParent lookup table, then
|
|
|
|
// it's not a parent -> so it's a head!
|
2013-06-04 14:00:22 -04:00
|
|
|
if _, exists := byParent[image.ID]; !exists {
|
|
|
|
heads[image.ID] = image
|
2013-03-23 20:03:30 -04:00
|
|
|
}
|
|
|
|
})
|
|
|
|
return heads, err
|
2013-03-18 03:15:35 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
func (graph *Graph) imageRoot(id string) string {
|
|
|
|
return path.Join(graph.Root, id)
|
|
|
|
}
|
2013-11-25 23:04:57 -05:00
|
|
|
|
|
|
|
func (graph *Graph) Driver() graphdriver.Driver {
|
|
|
|
return graph.driver
|
|
|
|
}
|