78bd3c0356
Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
46 lines
868 B
Go
46 lines
868 B
Go
package chrootarchive
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import (
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"flag"
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"fmt"
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"io/ioutil"
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"os"
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"runtime"
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"syscall"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/reexec"
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)
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func applyLayer() {
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runtime.LockOSThread()
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flag.Parse()
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if err := syscall.Chroot(flag.Arg(0)); err != nil {
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fatal(err)
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}
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if err := syscall.Chdir("/"); err != nil {
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fatal(err)
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}
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tmpDir, err := ioutil.TempDir("/", "temp-docker-extract")
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if err != nil {
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fatal(err)
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}
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os.Setenv("TMPDIR", tmpDir)
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if err := archive.ApplyLayer("/", os.Stdin); err != nil {
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os.RemoveAll(tmpDir)
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fatal(err)
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}
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os.RemoveAll(tmpDir)
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os.Exit(0)
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}
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func ApplyLayer(dest string, layer archive.ArchiveReader) error {
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cmd := reexec.Command("docker-applyLayer", dest)
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cmd.Stdin = layer
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out, err := cmd.CombinedOutput()
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if err != nil {
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return fmt.Errorf("ApplyLayer %s %s", err, out)
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}
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return nil
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}
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