// diskInjectCleanup handles unmounting, disconnecting nbd, and removing mount
// directory after diskInject.
func diskInjectCleanup(mntDir, nbdPath string) {
log.Debug("cleaning up vm inject: %s %s", mntDir, nbdPath)
out, err := processWrapper("umount", mntDir)
if err != nil {
log.Error("injectCleanup: %v, %v", out, err)
}
if err := nbd.DisconnectDevice(nbdPath); err != nil {
log.Error("qemu nbd disconnect: %v", err)
log.Warn("minimega was unable to disconnect %v", nbdPath)
}
err = os.Remove(mntDir)
if err != nil {
log.Error("rm mount dir: %v", err)
}
}
// Unmount, disconnect nbd, and remove mount directory
func vmInjectCleanup(mntDir, nbdPath string) {
log.Debug("cleaning up vm inject: %s %s", mntDir, nbdPath)
p := process("umount")
cmd := exec.Command(p, mntDir)
err := cmd.Run()
if err != nil {
log.Error("injectCleanup: %v", err)
}
err = nbd.DisconnectDevice(nbdPath)
if err != nil {
log.Error("qemu nbd disconnect: %v", err)
log.Warn("minimega was unable to disconnect %v", nbdPath)
}
p = process("rm")
cmd = exec.Command(p, "-r", mntDir)
err = cmd.Run()
if err != nil {
log.Error("rm mount dir: %v", err)
}
}
// Buildqcow2 creates a qcow2 image using qemu-img, qemu-nbd, fdisk, mkfs.ext4,
// cp, and extlinux.
func Buildqcow2(buildPath string, c vmconfig.Config) error {
targetName := strings.Split(filepath.Base(c.Path), ".")[0]
log.Debugln("using target name:", targetName)
err := nbd.Modprobe()
if err != nil {
return err
}
wd, err := os.Getwd()
if err != nil {
return err
}
// Final qcow2 target
targetqcow2 := fmt.Sprintf("%v/%v.qcow2", wd, targetName)
// Temporary file for building qcow2 file, will be renamed to targetqcow2
tmpqcow2 := fmt.Sprintf("%v/%v.qcow2.tmp", wd, targetName)
err = createQcow2(tmpqcow2, *f_qcowsize)
if err != nil {
return err
}
// Cleanup our temporary building file
defer func() {
// Check if file exists
if _, err := os.Stat(tmpqcow2); err == nil {
if err = os.Remove(tmpqcow2); err != nil {
log.Errorln(err)
}
}
}()
dev, err := nbd.ConnectImage(tmpqcow2)
if err != nil {
return err
}
// Disconnect from the nbd device
defer func() {
if err := nbd.DisconnectDevice(dev); err != nil {
log.Errorln(err)
}
}()
err = partitionQcow2(dev)
if err != nil {
return err
}
err = formatQcow2(dev + "p1")
if err != nil {
return err
}
mountPath, err := mountQcow2(dev + "p1")
if err != nil {
return err
}
err = copyQcow2(buildPath, mountPath)
if err != nil {
err2 := umountQcow2(mountPath)
if err2 != nil {
log.Errorln(err2)
}
return err
}
err = extlinux(mountPath)
if err != nil {
err2 := umountQcow2(mountPath)
if err2 != nil {
log.Errorln(err2)
}
return err
}
err = umountQcow2(mountPath)
if err != nil {
return err
}
err = extlinuxMBR(dev, *f_mbr)
if err != nil {
return err
}
return os.Rename(tmpqcow2, targetqcow2)
}