88 lines
1.8 KiB
Go
88 lines
1.8 KiB
Go
package chroot
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import (
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"github.com/mitchellh/packer/packer"
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"io"
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"log"
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"os"
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"os/exec"
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"path/filepath"
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"syscall"
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)
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// Communicator is a special communicator that works by executing
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// commands locally but within a chroot.
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type Communicator struct {
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Chroot string
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}
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func (c *Communicator) Start(cmd *packer.RemoteCmd) error {
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chrootCmdPath, err := exec.LookPath("chroot")
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if err != nil {
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return err
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}
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localCmd := exec.Command(chrootCmdPath, c.Chroot, "/bin/sh", "-c", cmd.Command)
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localCmd.Stdin = cmd.Stdin
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localCmd.Stdout = cmd.Stdout
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localCmd.Stderr = cmd.Stderr
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log.Printf("Executing: %s %#v", localCmd.Path, localCmd.Args)
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if err := localCmd.Start(); err != nil {
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return err
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}
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go func() {
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exitStatus := 0
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if err := localCmd.Wait(); err != nil {
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if exitErr, ok := err.(*exec.ExitError); ok {
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exitStatus = 1
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// There is no process-independent way to get the REAL
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// exit status so we just try to go deeper.
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if status, ok := exitErr.Sys().(syscall.WaitStatus); ok {
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exitStatus = status.ExitStatus()
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}
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}
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}
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log.Printf(
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"Chroot executation ended with '%d': '%s'",
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exitStatus, cmd.Command)
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cmd.SetExited(exitStatus)
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}()
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return nil
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}
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func (c *Communicator) Upload(dst string, r io.Reader) error {
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dst = filepath.Join(c.Chroot, dst)
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log.Printf("Uploading to chroot dir: %s", dst)
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f, err := os.Create(dst)
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if err != nil {
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return err
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}
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defer f.Close()
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if _, err := io.Copy(f, r); err != nil {
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return err
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}
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return nil
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}
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func (c *Communicator) Download(src string, w io.Writer) error {
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src = filepath.Join(c.Chroot, src)
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log.Printf("Downloading from chroot dir: %s", src)
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f, err := os.Open(src)
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if err != nil {
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return err
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}
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defer f.Close()
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if _, err := io.Copy(w, f); err != nil {
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return err
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}
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return nil
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}
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