2015-12-22 09:56:33 -05:00
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package lxc
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import (
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"fmt"
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2017-09-05 18:23:22 -04:00
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"github.com/hashicorp/packer/packer"
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2015-12-22 09:56:33 -05:00
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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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2016-05-25 15:34:36 -04:00
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"syscall"
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2015-12-22 09:56:33 -05:00
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)
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type LxcAttachCommunicator struct {
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RootFs string
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ContainerName string
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CmdWrapper CommandWrapper
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}
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func (c *LxcAttachCommunicator) Start(cmd *packer.RemoteCmd) error {
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localCmd, err := c.Execute(cmd.Command)
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if err != nil {
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return err
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}
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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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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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"lxc-attach 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 *LxcAttachCommunicator) Upload(dst string, r io.Reader, fi *os.FileInfo) error {
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dst = filepath.Join(c.RootFs, dst)
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log.Printf("Uploading to rootfs: %s", dst)
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tf, err := ioutil.TempFile("", "packer-lxc-attach")
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if err != nil {
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return fmt.Errorf("Error uploading file to rootfs: %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("sudo 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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log.Printf("Running copy command: %s", dst)
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return ShellCommand(cpCmd).Run()
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}
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func (c *LxcAttachCommunicator) 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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dest := filepath.Join(c.RootFs, dst)
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log.Printf("Uploading directory '%s' to rootfs '%s'", src, dest)
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cpCmd, err := c.CmdWrapper(fmt.Sprintf("sudo cp -R %s/. %s", src, dest))
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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 *LxcAttachCommunicator) Download(src string, w io.Writer) error {
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src = filepath.Join(c.RootFs, src)
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log.Printf("Downloading from rootfs 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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2016-05-10 20:37:01 -04:00
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func (c *LxcAttachCommunicator) DownloadDir(src string, dst string, exclude []string) error {
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2016-05-25 15:34:36 -04:00
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return fmt.Errorf("DownloadDir is not implemented for lxc")
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2016-05-10 20:37:01 -04:00
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}
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2015-12-22 09:56:33 -05:00
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func (c *LxcAttachCommunicator) Execute(commandString string) (*exec.Cmd, error) {
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log.Printf("Executing with lxc-attach in container: %s %s %s", c.ContainerName, c.RootFs, commandString)
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command, err := c.CmdWrapper(
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fmt.Sprintf("sudo lxc-attach --name %s -- /bin/sh -c \"%s\"", c.ContainerName, commandString))
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if err != nil {
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return nil, err
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}
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localCmd := ShellCommand(command)
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log.Printf("Executing lxc-attach: %s %#v", localCmd.Path, localCmd.Args)
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return localCmd, nil
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}
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func (c *LxcAttachCommunicator) CheckInit() (string, error) {
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log.Printf("Debug runlevel exec")
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localCmd, err := c.Execute("/sbin/runlevel")
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if err != nil {
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return "", err
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}
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pr, _ := localCmd.StdoutPipe()
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if err = localCmd.Start(); err != nil {
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return "", err
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}
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output, err := ioutil.ReadAll(pr)
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if err != nil {
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return "", err
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}
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err = localCmd.Wait()
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if err != nil {
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return "", err
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}
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return strings.TrimSpace(string(output)), nil
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2016-05-10 20:37:01 -04:00
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}
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