33 lines
778 B
Go
33 lines
778 B
Go
// +build linux
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package mount
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"syscall"
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"github.com/dotcloud/docker/pkg/system"
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)
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func PivotRoot(rootfs string) error {
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pivotDir, err := ioutil.TempDir(rootfs, ".pivot_root")
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if err != nil {
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return fmt.Errorf("can't create pivot_root dir %s, error %v", pivotDir, err)
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}
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if err := system.Pivotroot(rootfs, pivotDir); err != nil {
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return fmt.Errorf("pivot_root %s", err)
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}
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if err := system.Chdir("/"); err != nil {
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return fmt.Errorf("chdir / %s", err)
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}
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// path to pivot dir now changed, update
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pivotDir = filepath.Join("/", filepath.Base(pivotDir))
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if err := system.Unmount(pivotDir, syscall.MNT_DETACH); err != nil {
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return fmt.Errorf("unmount pivot_root dir %s", err)
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}
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return os.Remove(pivotDir)
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}
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