Move volumes out of container.go and into volumes.go
This helps clean up the container file and move volumes into one location. We currently cannot move volumes to a sub pkg because they depend on Container and also modify fields on the container. Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
This commit is contained in:
Michael Crosby
parent
6dd1bb9eb0
commit
bd54d40f68
2 changed files with 339 additions and 301 deletions
308
container.go
308
container.go
|
|
@ -9,7 +9,6 @@ import (
|
|||
"github.com/dotcloud/docker/execdriver"
|
||||
"github.com/dotcloud/docker/graphdriver"
|
||||
"github.com/dotcloud/docker/nat"
|
||||
"github.com/dotcloud/docker/pkg/mount"
|
||||
"github.com/dotcloud/docker/pkg/term"
|
||||
"github.com/dotcloud/docker/runconfig"
|
||||
"github.com/dotcloud/docker/utils"
|
||||
|
|
@ -19,7 +18,6 @@ import (
|
|||
"log"
|
||||
"os"
|
||||
"path"
|
||||
"path/filepath"
|
||||
"strings"
|
||||
"sync"
|
||||
"syscall"
|
||||
|
|
@ -27,8 +25,10 @@ import (
|
|||
)
|
||||
|
||||
var (
|
||||
ErrNotATTY = errors.New("The PTY is not a file")
|
||||
ErrNoTTY = errors.New("No PTY found")
|
||||
ErrNotATTY = errors.New("The PTY is not a file")
|
||||
ErrNoTTY = errors.New("No PTY found")
|
||||
ErrContainerStart = errors.New("The container failed to start. Unknown error")
|
||||
ErrContainerStartTimeout = errors.New("The container failed to start due to timed out.")
|
||||
)
|
||||
|
||||
type Container struct {
|
||||
|
|
@ -74,17 +74,6 @@ type Container struct {
|
|||
activeLinks map[string]*Link
|
||||
}
|
||||
|
||||
type BindMap struct {
|
||||
SrcPath string
|
||||
DstPath string
|
||||
Mode string
|
||||
}
|
||||
|
||||
var (
|
||||
ErrContainerStart = errors.New("The container failed to start. Unknown error")
|
||||
ErrContainerStartTimeout = errors.New("The container failed to start due to timed out.")
|
||||
)
|
||||
|
||||
// FIXME: move deprecated port stuff to nat to clean up the core.
|
||||
type PortMapping map[string]string // Deprecated
|
||||
|
||||
|
|
@ -503,17 +492,7 @@ func (container *Container) Start() (err error) {
|
|||
log.Printf("WARNING: IPv4 forwarding is disabled. Networking will not work")
|
||||
}
|
||||
|
||||
if container.Volumes == nil || len(container.Volumes) == 0 {
|
||||
container.Volumes = make(map[string]string)
|
||||
container.VolumesRW = make(map[string]bool)
|
||||
}
|
||||
|
||||
// Apply volumes from another container if requested
|
||||
if err := container.applyExternalVolumes(); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if err := container.createVolumes(); err != nil {
|
||||
if err := prepareVolumesForContainer(container); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
|
|
@ -587,62 +566,10 @@ func (container *Container) Start() (err error) {
|
|||
return err
|
||||
}
|
||||
|
||||
// Setup the root fs as a bind mount of the base fs
|
||||
root := container.RootfsPath()
|
||||
if err := os.MkdirAll(root, 0755); err != nil && !os.IsExist(err) {
|
||||
return nil
|
||||
}
|
||||
|
||||
// Create a bind mount of the base fs as a place where we can add mounts
|
||||
// without affecting the ability to access the base fs
|
||||
if err := mount.Mount(container.basefs, root, "none", "bind,rw"); err != nil {
|
||||
if err := mountVolumesForContainer(container, envPath); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Make sure the root fs is private so the mounts here don't propagate to basefs
|
||||
if err := mount.ForceMount(root, root, "none", "private"); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Mount docker specific files into the containers root fs
|
||||
if err := mount.Mount(runtime.sysInitPath, path.Join(root, "/.dockerinit"), "none", "bind,ro"); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := mount.Mount(envPath, path.Join(root, "/.dockerenv"), "none", "bind,ro"); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := mount.Mount(container.ResolvConfPath, path.Join(root, "/etc/resolv.conf"), "none", "bind,ro"); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if container.HostnamePath != "" && container.HostsPath != "" {
|
||||
if err := mount.Mount(container.HostnamePath, path.Join(root, "/etc/hostname"), "none", "bind,ro"); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := mount.Mount(container.HostsPath, path.Join(root, "/etc/hosts"), "none", "bind,ro"); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
// Mount user specified volumes
|
||||
for r, v := range container.Volumes {
|
||||
mountAs := "ro"
|
||||
if container.VolumesRW[r] {
|
||||
mountAs = "rw"
|
||||
}
|
||||
|
||||
r = path.Join(root, r)
|
||||
if p, err := utils.FollowSymlinkInScope(r, root); err != nil {
|
||||
return err
|
||||
} else {
|
||||
r = p
|
||||
}
|
||||
|
||||
if err := mount.Mount(v, r, "none", fmt.Sprintf("bind,%s", mountAs)); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
populateCommand(container)
|
||||
|
||||
// Setup logging of stdout and stderr to disk
|
||||
|
|
@ -695,205 +622,6 @@ func (container *Container) Start() (err error) {
|
|||
return nil
|
||||
}
|
||||
|
||||
func (container *Container) getBindMap() (map[string]BindMap, error) {
|
||||
// Create the requested bind mounts
|
||||
binds := make(map[string]BindMap)
|
||||
// Define illegal container destinations
|
||||
illegalDsts := []string{"/", "."}
|
||||
|
||||
for _, bind := range container.hostConfig.Binds {
|
||||
// FIXME: factorize bind parsing in parseBind
|
||||
var src, dst, mode string
|
||||
arr := strings.Split(bind, ":")
|
||||
if len(arr) == 2 {
|
||||
src = arr[0]
|
||||
dst = arr[1]
|
||||
mode = "rw"
|
||||
} else if len(arr) == 3 {
|
||||
src = arr[0]
|
||||
dst = arr[1]
|
||||
mode = arr[2]
|
||||
} else {
|
||||
return nil, fmt.Errorf("Invalid bind specification: %s", bind)
|
||||
}
|
||||
|
||||
// Bail if trying to mount to an illegal destination
|
||||
for _, illegal := range illegalDsts {
|
||||
if dst == illegal {
|
||||
return nil, fmt.Errorf("Illegal bind destination: %s", dst)
|
||||
}
|
||||
}
|
||||
|
||||
bindMap := BindMap{
|
||||
SrcPath: src,
|
||||
DstPath: dst,
|
||||
Mode: mode,
|
||||
}
|
||||
binds[path.Clean(dst)] = bindMap
|
||||
}
|
||||
return binds, nil
|
||||
}
|
||||
|
||||
func (container *Container) createVolumes() error {
|
||||
binds, err := container.getBindMap()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
volumesDriver := container.runtime.volumes.driver
|
||||
// Create the requested volumes if they don't exist
|
||||
for volPath := range container.Config.Volumes {
|
||||
volPath = path.Clean(volPath)
|
||||
volIsDir := true
|
||||
// Skip existing volumes
|
||||
if _, exists := container.Volumes[volPath]; exists {
|
||||
continue
|
||||
}
|
||||
var srcPath string
|
||||
var isBindMount bool
|
||||
srcRW := false
|
||||
// If an external bind is defined for this volume, use that as a source
|
||||
if bindMap, exists := binds[volPath]; exists {
|
||||
isBindMount = true
|
||||
srcPath = bindMap.SrcPath
|
||||
if strings.ToLower(bindMap.Mode) == "rw" {
|
||||
srcRW = true
|
||||
}
|
||||
if stat, err := os.Stat(bindMap.SrcPath); err != nil {
|
||||
return err
|
||||
} else {
|
||||
volIsDir = stat.IsDir()
|
||||
}
|
||||
// Otherwise create an directory in $ROOT/volumes/ and use that
|
||||
} else {
|
||||
|
||||
// Do not pass a container as the parameter for the volume creation.
|
||||
// The graph driver using the container's information ( Image ) to
|
||||
// create the parent.
|
||||
c, err := container.runtime.volumes.Create(nil, nil, "", "", nil)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
srcPath, err = volumesDriver.Get(c.ID)
|
||||
if err != nil {
|
||||
return fmt.Errorf("Driver %s failed to get volume rootfs %s: %s", volumesDriver, c.ID, err)
|
||||
}
|
||||
srcRW = true // RW by default
|
||||
}
|
||||
|
||||
if p, err := filepath.EvalSymlinks(srcPath); err != nil {
|
||||
return err
|
||||
} else {
|
||||
srcPath = p
|
||||
}
|
||||
|
||||
container.Volumes[volPath] = srcPath
|
||||
container.VolumesRW[volPath] = srcRW
|
||||
|
||||
// Create the mountpoint
|
||||
volPath = path.Join(container.basefs, volPath)
|
||||
rootVolPath, err := utils.FollowSymlinkInScope(volPath, container.basefs)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if _, err := os.Stat(rootVolPath); err != nil {
|
||||
if os.IsNotExist(err) {
|
||||
if volIsDir {
|
||||
if err := os.MkdirAll(rootVolPath, 0755); err != nil {
|
||||
return err
|
||||
}
|
||||
} else {
|
||||
if err := os.MkdirAll(path.Dir(rootVolPath), 0755); err != nil {
|
||||
return err
|
||||
}
|
||||
if f, err := os.OpenFile(rootVolPath, os.O_CREATE, 0755); err != nil {
|
||||
return err
|
||||
} else {
|
||||
f.Close()
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Do not copy or change permissions if we are mounting from the host
|
||||
if srcRW && !isBindMount {
|
||||
volList, err := ioutil.ReadDir(rootVolPath)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if len(volList) > 0 {
|
||||
srcList, err := ioutil.ReadDir(srcPath)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if len(srcList) == 0 {
|
||||
// If the source volume is empty copy files from the root into the volume
|
||||
if err := archive.CopyWithTar(rootVolPath, srcPath); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
var stat syscall.Stat_t
|
||||
if err := syscall.Stat(rootVolPath, &stat); err != nil {
|
||||
return err
|
||||
}
|
||||
var srcStat syscall.Stat_t
|
||||
if err := syscall.Stat(srcPath, &srcStat); err != nil {
|
||||
return err
|
||||
}
|
||||
// Change the source volume's ownership if it differs from the root
|
||||
// files that were just copied
|
||||
if stat.Uid != srcStat.Uid || stat.Gid != srcStat.Gid {
|
||||
if err := os.Chown(srcPath, int(stat.Uid), int(stat.Gid)); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (container *Container) applyExternalVolumes() error {
|
||||
if container.Config.VolumesFrom != "" {
|
||||
containerSpecs := strings.Split(container.Config.VolumesFrom, ",")
|
||||
for _, containerSpec := range containerSpecs {
|
||||
mountRW := true
|
||||
specParts := strings.SplitN(containerSpec, ":", 2)
|
||||
switch len(specParts) {
|
||||
case 0:
|
||||
return fmt.Errorf("Malformed volumes-from specification: %s", container.Config.VolumesFrom)
|
||||
case 2:
|
||||
switch specParts[1] {
|
||||
case "ro":
|
||||
mountRW = false
|
||||
case "rw": // mountRW is already true
|
||||
default:
|
||||
return fmt.Errorf("Malformed volumes-from specification: %s", containerSpec)
|
||||
}
|
||||
}
|
||||
c := container.runtime.Get(specParts[0])
|
||||
if c == nil {
|
||||
return fmt.Errorf("Container %s not found. Impossible to mount its volumes", container.ID)
|
||||
}
|
||||
for volPath, id := range c.Volumes {
|
||||
if _, exists := container.Volumes[volPath]; exists {
|
||||
continue
|
||||
}
|
||||
if err := os.MkdirAll(path.Join(container.basefs, volPath), 0755); err != nil {
|
||||
return err
|
||||
}
|
||||
container.Volumes[volPath] = id
|
||||
if isRW, exists := c.VolumesRW[volPath]; exists {
|
||||
container.VolumesRW[volPath] = isRW && mountRW
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (container *Container) Run() error {
|
||||
if err := container.Start(); err != nil {
|
||||
return err
|
||||
|
|
@ -1166,29 +894,7 @@ func (container *Container) cleanup() {
|
|||
}
|
||||
}
|
||||
|
||||
var (
|
||||
root = container.RootfsPath()
|
||||
mounts = []string{
|
||||
root,
|
||||
path.Join(root, "/.dockerinit"),
|
||||
path.Join(root, "/.dockerenv"),
|
||||
path.Join(root, "/etc/resolv.conf"),
|
||||
}
|
||||
)
|
||||
|
||||
if container.HostnamePath != "" && container.HostsPath != "" {
|
||||
mounts = append(mounts, path.Join(root, "/etc/hostname"), path.Join(root, "/etc/hosts"))
|
||||
}
|
||||
|
||||
for r := range container.Volumes {
|
||||
mounts = append(mounts, path.Join(root, r))
|
||||
}
|
||||
|
||||
for i := len(mounts) - 1; i >= 0; i-- {
|
||||
if lastError := mount.Unmount(mounts[i]); lastError != nil {
|
||||
log.Printf("Failed to umount %v: %v", mounts[i], lastError)
|
||||
}
|
||||
}
|
||||
unmountVolumesForContainer(container)
|
||||
|
||||
if err := container.Unmount(); err != nil {
|
||||
log.Printf("%v: Failed to umount filesystem: %v", container.ID, err)
|
||||
|
|
|
|||
332
volumes.go
Normal file
332
volumes.go
Normal file
|
|
@ -0,0 +1,332 @@
|
|||
package docker
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"github.com/dotcloud/docker/archive"
|
||||
"github.com/dotcloud/docker/pkg/mount"
|
||||
"github.com/dotcloud/docker/utils"
|
||||
"io/ioutil"
|
||||
"log"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"strings"
|
||||
"syscall"
|
||||
)
|
||||
|
||||
type BindMap struct {
|
||||
SrcPath string
|
||||
DstPath string
|
||||
Mode string
|
||||
}
|
||||
|
||||
func prepareVolumesForContainer(container *Container) error {
|
||||
if container.Volumes == nil || len(container.Volumes) == 0 {
|
||||
container.Volumes = make(map[string]string)
|
||||
container.VolumesRW = make(map[string]bool)
|
||||
}
|
||||
|
||||
if err := applyVolumesFrom(container); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := createVolumes(container); err != nil {
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func mountVolumesForContainer(container *Container, envPath string) error {
|
||||
// Setup the root fs as a bind mount of the base fs
|
||||
var (
|
||||
root = container.RootfsPath()
|
||||
runtime = container.runtime
|
||||
)
|
||||
if err := os.MkdirAll(root, 0755); err != nil && !os.IsExist(err) {
|
||||
return nil
|
||||
}
|
||||
|
||||
// Create a bind mount of the base fs as a place where we can add mounts
|
||||
// without affecting the ability to access the base fs
|
||||
if err := mount.Mount(container.basefs, root, "none", "bind,rw"); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Make sure the root fs is private so the mounts here don't propagate to basefs
|
||||
if err := mount.ForceMount(root, root, "none", "private"); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Mount docker specific files into the containers root fs
|
||||
if err := mount.Mount(runtime.sysInitPath, filepath.Join(root, "/.dockerinit"), "none", "bind,ro"); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := mount.Mount(envPath, filepath.Join(root, "/.dockerenv"), "none", "bind,ro"); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := mount.Mount(container.ResolvConfPath, filepath.Join(root, "/etc/resolv.conf"), "none", "bind,ro"); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if container.HostnamePath != "" && container.HostsPath != "" {
|
||||
if err := mount.Mount(container.HostnamePath, filepath.Join(root, "/etc/hostname"), "none", "bind,ro"); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := mount.Mount(container.HostsPath, filepath.Join(root, "/etc/hosts"), "none", "bind,ro"); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
// Mount user specified volumes
|
||||
for r, v := range container.Volumes {
|
||||
mountAs := "ro"
|
||||
if container.VolumesRW[r] {
|
||||
mountAs = "rw"
|
||||
}
|
||||
|
||||
r = filepath.Join(root, r)
|
||||
if p, err := utils.FollowSymlinkInScope(r, root); err != nil {
|
||||
return err
|
||||
} else {
|
||||
r = p
|
||||
}
|
||||
|
||||
if err := mount.Mount(v, r, "none", fmt.Sprintf("bind,%s", mountAs)); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func unmountVolumesForContainer(container *Container) {
|
||||
var (
|
||||
root = container.RootfsPath()
|
||||
mounts = []string{
|
||||
root,
|
||||
filepath.Join(root, "/.dockerinit"),
|
||||
filepath.Join(root, "/.dockerenv"),
|
||||
filepath.Join(root, "/etc/resolv.conf"),
|
||||
}
|
||||
)
|
||||
|
||||
if container.HostnamePath != "" && container.HostsPath != "" {
|
||||
mounts = append(mounts, filepath.Join(root, "/etc/hostname"), filepath.Join(root, "/etc/hosts"))
|
||||
}
|
||||
|
||||
for r := range container.Volumes {
|
||||
mounts = append(mounts, filepath.Join(root, r))
|
||||
}
|
||||
|
||||
for i := len(mounts) - 1; i >= 0; i-- {
|
||||
if lastError := mount.Unmount(mounts[i]); lastError != nil {
|
||||
log.Printf("Failed to umount %v: %v", mounts[i], lastError)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func applyVolumesFrom(container *Container) error {
|
||||
if container.Config.VolumesFrom != "" {
|
||||
for _, containerSpec := range strings.Split(container.Config.VolumesFrom, ",") {
|
||||
var (
|
||||
mountRW = true
|
||||
specParts = strings.SplitN(containerSpec, ":", 2)
|
||||
)
|
||||
|
||||
switch len(specParts) {
|
||||
case 0:
|
||||
return fmt.Errorf("Malformed volumes-from specification: %s", container.Config.VolumesFrom)
|
||||
case 2:
|
||||
switch specParts[1] {
|
||||
case "ro":
|
||||
mountRW = false
|
||||
case "rw": // mountRW is already true
|
||||
default:
|
||||
return fmt.Errorf("Malformed volumes-from specification: %s", containerSpec)
|
||||
}
|
||||
}
|
||||
|
||||
c := container.runtime.Get(specParts[0])
|
||||
if c == nil {
|
||||
return fmt.Errorf("Container %s not found. Impossible to mount its volumes", container.ID)
|
||||
}
|
||||
|
||||
for volPath, id := range c.Volumes {
|
||||
if _, exists := container.Volumes[volPath]; exists {
|
||||
continue
|
||||
}
|
||||
if err := os.MkdirAll(filepath.Join(container.basefs, volPath), 0755); err != nil {
|
||||
return err
|
||||
}
|
||||
container.Volumes[volPath] = id
|
||||
if isRW, exists := c.VolumesRW[volPath]; exists {
|
||||
container.VolumesRW[volPath] = isRW && mountRW
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func getBindMap(container *Container) (map[string]BindMap, error) {
|
||||
var (
|
||||
// Create the requested bind mounts
|
||||
binds = make(map[string]BindMap)
|
||||
// Define illegal container destinations
|
||||
illegalDsts = []string{"/", "."}
|
||||
)
|
||||
|
||||
for _, bind := range container.hostConfig.Binds {
|
||||
// FIXME: factorize bind parsing in parseBind
|
||||
var (
|
||||
src, dst, mode string
|
||||
arr = strings.Split(bind, ":")
|
||||
)
|
||||
|
||||
if len(arr) == 2 {
|
||||
src = arr[0]
|
||||
dst = arr[1]
|
||||
mode = "rw"
|
||||
} else if len(arr) == 3 {
|
||||
src = arr[0]
|
||||
dst = arr[1]
|
||||
mode = arr[2]
|
||||
} else {
|
||||
return nil, fmt.Errorf("Invalid bind specification: %s", bind)
|
||||
}
|
||||
|
||||
// Bail if trying to mount to an illegal destination
|
||||
for _, illegal := range illegalDsts {
|
||||
if dst == illegal {
|
||||
return nil, fmt.Errorf("Illegal bind destination: %s", dst)
|
||||
}
|
||||
}
|
||||
|
||||
bindMap := BindMap{
|
||||
SrcPath: src,
|
||||
DstPath: dst,
|
||||
Mode: mode,
|
||||
}
|
||||
binds[filepath.Clean(dst)] = bindMap
|
||||
}
|
||||
return binds, nil
|
||||
}
|
||||
|
||||
func createVolumes(container *Container) error {
|
||||
binds, err := getBindMap(container)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
volumesDriver := container.runtime.volumes.driver
|
||||
// Create the requested volumes if they don't exist
|
||||
for volPath := range container.Config.Volumes {
|
||||
volPath = filepath.Clean(volPath)
|
||||
volIsDir := true
|
||||
// Skip existing volumes
|
||||
if _, exists := container.Volumes[volPath]; exists {
|
||||
continue
|
||||
}
|
||||
var srcPath string
|
||||
var isBindMount bool
|
||||
srcRW := false
|
||||
// If an external bind is defined for this volume, use that as a source
|
||||
if bindMap, exists := binds[volPath]; exists {
|
||||
isBindMount = true
|
||||
srcPath = bindMap.SrcPath
|
||||
if strings.ToLower(bindMap.Mode) == "rw" {
|
||||
srcRW = true
|
||||
}
|
||||
if stat, err := os.Stat(bindMap.SrcPath); err != nil {
|
||||
return err
|
||||
} else {
|
||||
volIsDir = stat.IsDir()
|
||||
}
|
||||
// Otherwise create an directory in $ROOT/volumes/ and use that
|
||||
} else {
|
||||
|
||||
// Do not pass a container as the parameter for the volume creation.
|
||||
// The graph driver using the container's information ( Image ) to
|
||||
// create the parent.
|
||||
c, err := container.runtime.volumes.Create(nil, nil, "", "", nil)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
srcPath, err = volumesDriver.Get(c.ID)
|
||||
if err != nil {
|
||||
return fmt.Errorf("Driver %s failed to get volume rootfs %s: %s", volumesDriver, c.ID, err)
|
||||
}
|
||||
srcRW = true // RW by default
|
||||
}
|
||||
|
||||
if p, err := filepath.EvalSymlinks(srcPath); err != nil {
|
||||
return err
|
||||
} else {
|
||||
srcPath = p
|
||||
}
|
||||
|
||||
container.Volumes[volPath] = srcPath
|
||||
container.VolumesRW[volPath] = srcRW
|
||||
|
||||
// Create the mountpoint
|
||||
volPath = filepath.Join(container.basefs, volPath)
|
||||
rootVolPath, err := utils.FollowSymlinkInScope(volPath, container.basefs)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if _, err := os.Stat(rootVolPath); err != nil {
|
||||
if os.IsNotExist(err) {
|
||||
if volIsDir {
|
||||
if err := os.MkdirAll(rootVolPath, 0755); err != nil {
|
||||
return err
|
||||
}
|
||||
} else {
|
||||
if err := os.MkdirAll(filepath.Dir(rootVolPath), 0755); err != nil {
|
||||
return err
|
||||
}
|
||||
if f, err := os.OpenFile(rootVolPath, os.O_CREATE, 0755); err != nil {
|
||||
return err
|
||||
} else {
|
||||
f.Close()
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Do not copy or change permissions if we are mounting from the host
|
||||
if srcRW && !isBindMount {
|
||||
volList, err := ioutil.ReadDir(rootVolPath)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if len(volList) > 0 {
|
||||
srcList, err := ioutil.ReadDir(srcPath)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if len(srcList) == 0 {
|
||||
// If the source volume is empty copy files from the root into the volume
|
||||
if err := archive.CopyWithTar(rootVolPath, srcPath); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
var stat syscall.Stat_t
|
||||
if err := syscall.Stat(rootVolPath, &stat); err != nil {
|
||||
return err
|
||||
}
|
||||
var srcStat syscall.Stat_t
|
||||
if err := syscall.Stat(srcPath, &srcStat); err != nil {
|
||||
return err
|
||||
}
|
||||
// Change the source volume's ownership if it differs from the root
|
||||
// files that were just copied
|
||||
if stat.Uid != srcStat.Uid || stat.Gid != srcStat.Gid {
|
||||
if err := os.Chown(srcPath, int(stat.Uid), int(stat.Gid)); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
Loading…
Reference in a new issue