func (v *Volume) initialize(container *Container) error {
var err error
v.VolPath = filepath.Clean(v.VolPath)
// Do not initialize an existing volume
if _, exists := container.Volumes[v.VolPath]; exists {
return nil
}
// If it's not a bindmount we need to create the dir on the host
if !v.isBindMount {
v.HostPath, err = createVolumeHostPath(container)
if err != nil {
return err
}
}
hostPath, err := filepath.EvalSymlinks(v.HostPath)
if err != nil {
return err
}
// Create the mountpoint
// This is the path to the volume within the container FS
// This differs from `hostPath` in that `hostPath` refers to the place where
// the volume data is actually stored on the host
fullVolPath, err := symlink.FollowSymlinkInScope(filepath.Join(container.basefs, v.VolPath), container.basefs)
if err != nil {
return err
}
container.Volumes[v.VolPath] = hostPath
container.VolumesRW[v.VolPath] = v.isRw()
volIsDir, err := v.isDir()
if err != nil {
return err
}
if err := createIfNotExists(fullVolPath, volIsDir); err != nil {
return err
}
// Do not copy or change permissions if we are mounting from the host
if v.isRw() && !v.isBindMount {
return copyExistingContents(fullVolPath, hostPath)
}
return nil
}
func setupBindmounts(rootfs string, mountConfig *MountConfig) error {
bindMounts := mountConfig.Mounts
for _, m := range bindMounts.OfType("bind") {
var (
flags = syscall.MS_BIND | syscall.MS_REC
dest = filepath.Join(rootfs, m.Destination)
)
if !m.Writable {
flags = flags | syscall.MS_RDONLY
}
stat, err := os.Stat(m.Source)
if err != nil {
return err
}
dest, err = symlink.FollowSymlinkInScope(dest, rootfs)
if err != nil {
return err
}
if err := createIfNotExists(dest, stat.IsDir()); err != nil {
return fmt.Errorf("Creating new bind-mount target, %s", err)
}
if err := syscall.Mount(m.Source, dest, "bind", uintptr(flags), ""); err != nil {
return fmt.Errorf("mounting %s into %s %s", m.Source, dest, err)
}
if !m.Writable {
if err := syscall.Mount(m.Source, dest, "bind", uintptr(flags|syscall.MS_REMOUNT), ""); err != nil {
return fmt.Errorf("remounting %s into %s %s", m.Source, dest, err)
}
}
if m.Relabel != "" {
if err := label.Relabel(m.Source, mountConfig.MountLabel, m.Relabel); err != nil {
return fmt.Errorf("relabeling %s to %s %s", m.Source, mountConfig.MountLabel, err)
}
}
if m.Private {
if err := syscall.Mount("", dest, "none", uintptr(syscall.MS_PRIVATE), ""); err != nil {
return fmt.Errorf("mounting %s private %s", dest, err)
}
}
}
return nil
}
func (container *Container) getRootResourcePath(path string) (string, error) {
cleanPath := filepath.Join("/", path)
return symlink.FollowSymlinkInScope(filepath.Join(container.root, cleanPath), container.root)
}
func (b *buildFile) addContext(container *Container, orig, dest string, decompress bool) error {
var (
err error
destExists = true
origPath = path.Join(b.contextPath, orig)
destPath = path.Join(container.RootfsPath(), dest)
)
if destPath != container.RootfsPath() {
destPath, err = symlink.FollowSymlinkInScope(destPath, container.RootfsPath())
if err != nil {
return err
}
}
// Preserve the trailing '/'
if strings.HasSuffix(dest, "/") || dest == "." {
destPath = destPath + "/"
}
destStat, err := os.Stat(destPath)
if err != nil {
if !os.IsNotExist(err) {
return err
}
destExists = false
}
fi, err := os.Stat(origPath)
if err != nil {
if os.IsNotExist(err) {
return fmt.Errorf("%s: no such file or directory", orig)
}
return err
}
if fi.IsDir() {
return copyAsDirectory(origPath, destPath, destExists)
}
// If we are adding a remote file (or we've been told not to decompress), do not try to untar it
if decompress {
// First try to unpack the source as an archive
// to support the untar feature we need to clean up the path a little bit
// because tar is very forgiving. First we need to strip off the archive's
// filename from the path but this is only added if it does not end in / .
tarDest := destPath
if strings.HasSuffix(tarDest, "/") {
tarDest = filepath.Dir(destPath)
}
// try to successfully untar the orig
if err := archive.UntarPath(origPath, tarDest); err == nil {
return nil
} else if err != io.EOF {
log.Debugf("Couldn't untar %s to %s: %s", origPath, tarDest, err)
}
}
if err := os.MkdirAll(path.Dir(destPath), 0755); err != nil {
return err
}
if err := archive.CopyWithTar(origPath, destPath); err != nil {
return err
}
resPath := destPath
if destExists && destStat.IsDir() {
resPath = path.Join(destPath, path.Base(origPath))
}
return fixPermissions(resPath, 0, 0)
}