78 lines
2.1 KiB
Go
78 lines
2.1 KiB
Go
package allocdir
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import (
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"fmt"
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"os"
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"path/filepath"
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"syscall"
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"github.com/hashicorp/go-multierror"
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)
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// mountSpecialDirs mounts the dev and proc file system from the host to the
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// chroot
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func (t *TaskDir) mountSpecialDirs() error {
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// Mount dev
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dev := filepath.Join(t.Dir, "dev")
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if !pathExists(dev) {
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if err := os.Mkdir(dev, 0777); err != nil {
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return fmt.Errorf("Mkdir(%v) failed: %v", dev, err)
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}
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}
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devEmpty, err := pathEmpty(dev)
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if err != nil {
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return fmt.Errorf("error listing %q: %v", dev, err)
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}
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if devEmpty {
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if err := syscall.Mount("none", dev, "devtmpfs", syscall.MS_RDONLY, ""); err != nil {
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return fmt.Errorf("Couldn't mount /dev to %v: %v", dev, err)
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}
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}
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// Mount proc
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proc := filepath.Join(t.Dir, "proc")
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if !pathExists(proc) {
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if err := os.Mkdir(proc, 0777); err != nil {
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return fmt.Errorf("Mkdir(%v) failed: %v", proc, err)
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}
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}
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procEmpty, err := pathEmpty(proc)
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if err != nil {
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return fmt.Errorf("error listing %q: %v", proc, err)
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}
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if procEmpty {
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if err := syscall.Mount("none", proc, "proc", syscall.MS_RDONLY, ""); err != nil {
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return fmt.Errorf("Couldn't mount /proc to %v: %v", proc, err)
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}
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}
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return nil
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}
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// unmountSpecialDirs unmounts the dev and proc file system from the chroot. No
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// error is returned if the directories do not exist or have already been
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// unmounted.
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func (t *TaskDir) unmountSpecialDirs() error {
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errs := new(multierror.Error)
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dev := filepath.Join(t.Dir, "dev")
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if pathExists(dev) {
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if err := unlinkDir(dev); err != nil {
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errs = multierror.Append(errs, fmt.Errorf("Failed to unmount dev %q: %v", dev, err))
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} else if err := os.RemoveAll(dev); err != nil {
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errs = multierror.Append(errs, fmt.Errorf("Failed to delete dev directory %q: %v", dev, err))
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}
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}
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// Unmount proc.
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proc := filepath.Join(t.Dir, "proc")
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if pathExists(proc) {
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if err := unlinkDir(proc); err != nil {
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errs = multierror.Append(errs, fmt.Errorf("Failed to unmount proc %q: %v", proc, err))
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} else if err := os.RemoveAll(proc); err != nil {
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errs = multierror.Append(errs, fmt.Errorf("Failed to delete proc directory %q: %v", dev, err))
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}
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}
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return errs.ErrorOrNil()
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}
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