// Run will execute the given command in the ACI being built. a.CurrentACIPath
// is where the untarred ACI is stored, a.DepStoreTarPath is the directory to
// download dependencies into, a.DepStoreExpandedPath is where the dependencies
// are expanded into, a.OverlayWorkPath is the work directory used by
// overlayfs, and insecure signifies whether downloaded images should be
// fetched over http or https.
func (a *ACBuild) Run(cmd []string, insecure bool) (err error) {
if err = a.lock(); err != nil {
return err
}
defer func() {
if err1 := a.unlock(); err == nil {
err = err1
}
}()
if os.Geteuid() != 0 {
return fmt.Errorf("the run subcommand must be run as root")
}
err = util.RmAndMkdir(a.OverlayTargetPath)
if err != nil {
return err
}
defer os.RemoveAll(a.OverlayTargetPath)
err = util.RmAndMkdir(a.OverlayWorkPath)
if err != nil {
return err
}
defer os.RemoveAll(a.OverlayWorkPath)
err = os.MkdirAll(a.DepStoreExpandedPath, 0755)
if err != nil {
return err
}
err = os.MkdirAll(a.DepStoreTarPath, 0755)
if err != nil {
return err
}
man, err := util.GetManifest(a.CurrentACIPath)
if err != nil {
return err
}
if len(man.Dependencies) != 0 {
if !supportsOverlay() {
err := exec.Command("modprobe", "overlay").Run()
if err != nil {
return err
}
if !supportsOverlay() {
return fmt.Errorf(
"overlayfs support required for using run with dependencies")
}
}
}
deps, err := a.renderACI(insecure, a.Debug)
if err != nil {
return err
}
var nspawnpath string
if deps == nil {
nspawnpath = path.Join(a.CurrentACIPath, aci.RootfsDir)
} else {
for i, dep := range deps {
deps[i] = path.Join(a.DepStoreExpandedPath, dep, aci.RootfsDir)
}
options := "lowerdir=" + strings.Join(deps, ":") +
",upperdir=" + path.Join(a.CurrentACIPath, aci.RootfsDir) +
",workdir=" + a.OverlayWorkPath
err := syscall.Mount("overlay", a.OverlayTargetPath, "overlay", 0, options)
if err != nil {
return err
}
defer func() {
err1 := syscall.Unmount(a.OverlayTargetPath, 0)
if err == nil {
err = err1
}
}()
nspawnpath = a.OverlayTargetPath
}
nspawncmd := []string{"systemd-nspawn", "-q", "-D", nspawnpath}
if man.App != nil {
for _, evar := range man.App.Environment {
nspawncmd = append(nspawncmd, "--setenv", evar.Name+"="+evar.Value)
}
}
err = a.mirrorLocalZoneInfo()
if err != nil {
return err
}
if len(cmd) == 0 {
return fmt.Errorf("command to run not set")
}
abscmd, err := findCmdInPath(pathlist, cmd[0], nspawnpath)
if err != nil {
return err
}
nspawncmd = append(nspawncmd, abscmd)
nspawncmd = append(nspawncmd, cmd[1:]...)
execCmd := exec.Command(nspawncmd[0], nspawncmd[1:]...)
execCmd.Stdin = os.Stdin
execCmd.Stdout = os.Stdout
execCmd.Stderr = os.Stderr
execCmd.Env = []string{"SYSTEMD_LOG_LEVEL=err"}
err = execCmd.Run()
if err != nil {
if err == exec.ErrNotFound {
return fmt.Errorf("systemd-nspawn is required but not found")
}
return err
}
return nil
}
// Run will execute the given command in the ACI being built. acipath is where
// the untarred ACI is stored, depstore is the directory to download
// dependencies into, scratchpath is where the dependencies are expanded into,
// workpath is the work directory used by overlayfs, and insecure signifies
// whether downloaded images should be fetched over http or https.
func Run(acipath, depstore, targetpath, scratchpath, workpath string, cmd []string, insecure bool) error {
err := util.RmAndMkdir(targetpath)
if err != nil {
return err
}
defer os.RemoveAll(targetpath)
err = util.RmAndMkdir(workpath)
if err != nil {
return err
}
defer os.RemoveAll(workpath)
err = os.MkdirAll(scratchpath, 0755)
if err != nil {
return err
}
err = os.MkdirAll(depstore, 0755)
if err != nil {
return err
}
man, err := util.GetManifest(acipath)
if err != nil {
return err
}
if len(man.Dependencies) != 0 {
err := util.Exec("modprobe", "overlay")
if err != nil {
return err
}
if !supportsOverlay() {
return fmt.Errorf(
"overlayfs support required for using run with dependencies")
}
}
deps, err := renderACI(acipath, scratchpath, depstore, insecure)
if err != nil {
return err
}
var nspawnpath string
if deps == nil {
nspawnpath = path.Join(acipath, aci.RootfsDir)
} else {
for i, dep := range deps {
deps[i] = path.Join(scratchpath, dep, aci.RootfsDir)
}
options := "-olowerdir=" + strings.Join(deps, ":") +
",upperdir=" + path.Join(acipath, aci.RootfsDir) + ",workdir=" + workpath
err := util.Exec("mount", "-t", "overlay",
"overlay", options, targetpath)
if err != nil {
return err
}
umount := exec.Command("umount", targetpath)
umount.Stdout = os.Stdout
umount.Stderr = os.Stderr
defer umount.Run()
nspawnpath = targetpath
}
nspawncmd := []string{"systemd-nspawn", "-q", "-D", nspawnpath}
if man.App != nil {
for _, evar := range man.App.Environment {
nspawncmd = append(nspawncmd, "--setenv", evar.Name+"="+evar.Value)
}
}
if len(cmd) == 0 {
return fmt.Errorf("command to run not set")
}
abscmd, err := findCmdInPath(pathlist, cmd[0], nspawnpath)
if err != nil {
return err
}
nspawncmd = append(nspawncmd, abscmd)
nspawncmd = append(nspawncmd, cmd[1:]...)
//fmt.Printf("%v\n", nspawncmd)
err = util.Exec(nspawncmd[0], nspawncmd[1:]...)
if err != nil {
return err
}
return nil
}