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114 lines
3.1 KiB
Go
114 lines
3.1 KiB
Go
// +build !windows
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package graph
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import (
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"encoding/json"
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"syscall"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/system"
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)
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// setupInitLayer populates a directory with mountpoints suitable
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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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func SetupInitLayer(initLayer string) error {
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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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"/.dockerenv": "file",
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"/etc/resolv.conf": "file",
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"/etc/hosts": "file",
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"/etc/hostname": "file",
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"/dev/console": "file",
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"/etc/mtab": "/proc/mounts",
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} {
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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 = filepath.Join(prev, p)
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syscall.Unlink(filepath.Join(initLayer, prev))
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}
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if _, err := os.Stat(filepath.Join(initLayer, pth)); err != nil {
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if os.IsNotExist(err) {
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if err := system.MkdirAll(filepath.Join(initLayer, filepath.Dir(pth)), 0755); err != nil {
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return err
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}
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switch typ {
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case "dir":
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if err := system.MkdirAll(filepath.Join(initLayer, pth), 0755); err != nil {
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return err
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}
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case "file":
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f, err := os.OpenFile(filepath.Join(initLayer, pth), os.O_CREATE, 0755)
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if err != nil {
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return err
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}
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f.Close()
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default:
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if err := os.Symlink(typ, filepath.Join(initLayer, pth)); err != nil {
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return err
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}
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}
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} else {
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return err
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}
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}
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}
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// Layer is ready to use, if it wasn't before.
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return nil
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}
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func createRootFilesystemInDriver(graph *Graph, img *Image, layerData archive.ArchiveReader) error {
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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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return nil
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}
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func (graph *Graph) restoreBaseImages() ([]string, error) {
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return nil, nil
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}
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// storeImage stores file system layer data for the given image to the
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// graph's storage driver. Image metadata is stored in a file
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// at the specified root directory.
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func (graph *Graph) storeImage(img *Image, layerData archive.ArchiveReader, root string) (err error) {
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// Store the layer. If layerData is not nil, unpack it into the new layer
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if layerData != nil {
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if img.Size, err = graph.driver.ApplyDiff(img.ID, img.Parent, layerData); err != nil {
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return err
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}
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}
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if err := graph.saveSize(root, int(img.Size)); err != nil {
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return err
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}
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f, err := os.OpenFile(jsonPath(root), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.FileMode(0600))
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if err != nil {
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return err
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}
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defer f.Close()
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return json.NewEncoder(f).Encode(img)
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}
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// TarLayer returns a tar archive of the image's filesystem layer.
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func (graph *Graph) TarLayer(img *Image) (arch archive.Archive, err error) {
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return graph.driver.Diff(img.ID, img.Parent)
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}
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