123 lines
2.7 KiB
Go
123 lines
2.7 KiB
Go
package chroot
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import (
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"bytes"
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"fmt"
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"github.com/mitchellh/packer/packer"
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"io"
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"io/ioutil"
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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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"strings"
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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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CmdWrapper CommandWrapper
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}
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func (c *Communicator) Start(cmd *packer.RemoteCmd) error {
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command, err := c.CmdWrapper(
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fmt.Sprintf("chroot %s /bin/sh -c \"%s\"", c.Chroot, cmd.Command))
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if err != nil {
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return err
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}
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localCmd := ShellCommand(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 execution exited 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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tf, err := ioutil.TempFile("", "packer-amazon-chroot")
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if err != nil {
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return fmt.Errorf("Error preparing shell script: %s", err)
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}
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defer os.Remove(tf.Name())
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io.Copy(tf, r)
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cpCmd, err := c.CmdWrapper(fmt.Sprintf("cp %s %s", tf.Name(), dst))
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if err != nil {
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return err
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}
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return ShellCommand(cpCmd).Run()
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}
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func (c *Communicator) UploadDir(dst string, src string, exclude []string) error {
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// TODO: remove any file copied if it appears in `exclude`
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chrootDest := filepath.Join(c.Chroot, dst)
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log.Printf("Uploading directory '%s' to '%s'", src, chrootDest)
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cpCmd, err := c.CmdWrapper(fmt.Sprintf("cp -R '%s' %s", src, chrootDest))
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if err != nil {
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return err
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}
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var stderr bytes.Buffer
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cmd := ShellCommand(cpCmd)
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cmd.Env = append(cmd.Env, os.Environ()...)
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cmd.Env = append(cmd.Env, "LANG=C")
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cmd.Stderr = &stderr
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err = cmd.Run()
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if err == nil {
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return err
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}
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if strings.Contains(stderr.String(), "No such file") {
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// This just means that the directory was empty. Just ignore it.
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return nil
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}
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return err
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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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