mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
120 lines
3.3 KiB
Go
120 lines
3.3 KiB
Go
// +build !windows
|
|
|
|
package graph
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"os"
|
|
"path/filepath"
|
|
"strings"
|
|
"syscall"
|
|
|
|
"github.com/Sirupsen/logrus"
|
|
"github.com/docker/docker/image"
|
|
"github.com/docker/docker/pkg/archive"
|
|
"github.com/docker/docker/pkg/system"
|
|
)
|
|
|
|
// SetupInitLayer populates a directory with mountpoints suitable
|
|
// for bind-mounting dockerinit into the container. The mountpoint is simply an
|
|
// empty file at /.dockerinit
|
|
// This extra layer is used by all containers as the top-most ro layer. It protects
|
|
// the container from unwanted side-effects on the rw layer.
|
|
func SetupInitLayer(initLayer string) error {
|
|
for pth, typ := range map[string]string{
|
|
"/dev/pts": "dir",
|
|
"/dev/shm": "dir",
|
|
"/proc": "dir",
|
|
"/sys": "dir",
|
|
"/.dockerinit": "file",
|
|
"/.dockerenv": "file",
|
|
"/etc/resolv.conf": "file",
|
|
"/etc/hosts": "file",
|
|
"/etc/hostname": "file",
|
|
"/dev/console": "file",
|
|
"/etc/mtab": "/proc/mounts",
|
|
} {
|
|
parts := strings.Split(pth, "/")
|
|
prev := "/"
|
|
for _, p := range parts[1:] {
|
|
prev = filepath.Join(prev, p)
|
|
syscall.Unlink(filepath.Join(initLayer, prev))
|
|
}
|
|
|
|
if _, err := os.Stat(filepath.Join(initLayer, pth)); err != nil {
|
|
if os.IsNotExist(err) {
|
|
if err := system.MkdirAll(filepath.Join(initLayer, filepath.Dir(pth)), 0755); err != nil {
|
|
return err
|
|
}
|
|
switch typ {
|
|
case "dir":
|
|
if err := system.MkdirAll(filepath.Join(initLayer, pth), 0755); err != nil {
|
|
return err
|
|
}
|
|
case "file":
|
|
f, err := os.OpenFile(filepath.Join(initLayer, pth), os.O_CREATE, 0755)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
f.Close()
|
|
default:
|
|
if err := os.Symlink(typ, filepath.Join(initLayer, pth)); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
} else {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
// Layer is ready to use, if it wasn't before.
|
|
return nil
|
|
}
|
|
|
|
func createRootFilesystemInDriver(graph *Graph, img *image.Image, layerData archive.Reader) error {
|
|
if err := graph.driver.Create(img.ID, img.Parent); err != nil {
|
|
return fmt.Errorf("Driver %s failed to create image rootfs %s: %s", graph.driver, img.ID, err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (graph *Graph) restoreBaseImages() ([]string, error) {
|
|
return nil, nil
|
|
}
|
|
|
|
// storeImage stores file system layer data for the given image to the
|
|
// graph's storage driver. Image metadata is stored in a file
|
|
// at the specified root directory.
|
|
func (graph *Graph) storeImage(img *image.Image, layerData archive.Reader, root string) (err error) {
|
|
// Store the layer. If layerData is not nil, unpack it into the new layer
|
|
if layerData != nil {
|
|
if err := graph.disassembleAndApplyTarLayer(img, layerData, root); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if err := graph.saveSize(root, img.Size); err != nil {
|
|
return err
|
|
}
|
|
|
|
f, err := os.OpenFile(jsonPath(root), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.FileMode(0600))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
defer f.Close()
|
|
|
|
return json.NewEncoder(f).Encode(img)
|
|
}
|
|
|
|
// TarLayer returns a tar archive of the image's filesystem layer.
|
|
func (graph *Graph) TarLayer(img *image.Image) (arch archive.Archive, err error) {
|
|
rdr, err := graph.assembleTarLayer(img)
|
|
if err != nil {
|
|
logrus.Debugf("[graph] TarLayer with traditional differ: %s", img.ID)
|
|
return graph.driver.Diff(img.ID, img.Parent)
|
|
}
|
|
return rdr, nil
|
|
}
|