func reexeced_main()

in cmd/hotdog-cc-hook/main.go [49:95]

• 40 lines of code
• 12 McCabe index (conditional complexity)

func reexeced_main() error {
	if len(os.Args) != 3 {
		return errors.New("wrong arg len")
	}
	bundle := os.Args[2]
	spec, err := hook.Config(specs.State{Bundle: bundle})
	if err != nil {
		return err
	}
	rootfs, err := hook.Root(bundle, spec)
	if err != nil {
		return err
	}

	hotdogBundleDir := filepath.Join(bundle, "hotdog")
	if err := os.Mkdir(hotdogBundleDir, 0755); err != nil {
		return err
	}
	if err := cp(filepath.Join(hotdog.HostDir, hotdog.PatchPath), filepath.Join(hotdogBundleDir, hotdog.PatchPath)); err != nil {
		return err
	}
	if err := cp(filepath.Join(hotdog.HostDir, hotdog.HotpatchBinary), filepath.Join(hotdogBundleDir, hotdog.HotpatchBinary)); err != nil {
		return err
	}

	mountTarget := filepath.Join(rootfs, hotdog.ContainerDir)
	if stat, err := os.Stat(mountTarget); err != nil {
		if _, ok := err.(*os.PathError); !ok {
			// cannot hotpatch
			return nil
		}
		if err := os.Mkdir(mountTarget, 0755); err != nil {
			// cannot hotpatch
			return nil
		}
	} else if !stat.IsDir() {
		// cannot hotpatch
		return nil
	}
	err = unix.Mount(hotdogBundleDir, mountTarget, "bind", unix.MS_BIND|unix.MS_NODEV|unix.MS_NOATIME|unix.MS_RELATIME, "")
	if err != nil {
		// cannot hotpatch
		return nil
	}
	// remount readonly
	return unix.Mount(hotdogBundleDir, mountTarget, "bind", unix.MS_REMOUNT|unix.MS_BIND|unix.MS_RDONLY, "")
}