}
	if output, err := b.execCommand("git", args, dir); err != nil {
		return fmt.Errorf("failed to exec 'git %s': %s: %v",
			strings.Join(args, " "), output, err)
	}

	files, err := ioutil.ReadDir(dir)
	if err != nil {
		return err
	}

	if len(b.revision) == 0 {
		// Done!
		volumeutil.SetReady(b.getMetaDir())
		return nil
	}

	var subdir string

	switch {

	var list []string
	for _, dir := range pathDirs() {
		if dir == "" || !filepath.IsAbs(dir) {
			// Refuse to use local directories in $PATH (hard-coding exec.ErrDot).
			continue
		}
		entries, err := os.ReadDir(dir)
		if err != nil {
			continue
		}
		for _, de := range entries {
			if de.IsDir() || !strings.HasPrefix(de.Name(), "go1.") {
				continue
			}
			info, err := de.Info()
			if err != nil {

		case "host2":
			return []byte("target1"), nil
		case "host3":
			return []byte("target2"), nil
		}
	}
	return nil, errors.New("not Implemented for Mock")
}

func (handler *mockOsIOHandler) ReadDir(dirname string) ([]os.FileInfo, error) {
	switch dirname {
	case "/sys/block/dm-1/slaves":
		f1 := &fakeFileInfo{
			name: "sda",
		}
		f2 := &fakeFileInfo{
			name: "sdb",
		}

import (
	"bytes"
	"crypto/sha256"
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
)

func main() {
	target := os.Args[1]
	dir := filepath.Join("testdata/fuzz", target)

	files, err := ioutil.ReadDir(dir)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}

	if len(files) == 0 {
		fmt.Fprintf(os.Stderr, "expect at least one new mutation to be written to testdata\n")
		os.Exit(1)
	}

}

// importRaw fills the rawPackage from the package files in srcDir.
// dir is the package's path relative to the modroot.
func importRaw(modroot, reldir string) *rawPackage {
	p := &rawPackage{
		dir: reldir,
	}

	absdir := filepath.Join(modroot, reldir)

	// We still haven't checked
	// that p.dir directory exists. This is the right time to do that check.

// compareStatus is used to confirm the contents of the thread
// specific status files match expectations.
func compareStatus(filter, expect string) error {
	expected := filter + expect
	pid := syscall.Getpid()
	fs, err := os.ReadDir(fmt.Sprintf("/proc/%d/task", pid))
	if err != nil {
		return fmt.Errorf("unable to find %d tasks: %v", pid, err)
	}
	expectedProc := fmt.Sprintf("Pid:\t%d", pid)
	foundAThread := false
	for _, f := range fs {

	}
}

func validateDirEmpty(dir string) error {
	files, err := ioutil.ReadDir(dir)
	if err != nil {
		return err
	}

	if len(files) != 0 {
		return fmt.Errorf("directory %q is not empty", dir)
	}
	return nil
}

func validateDirExists(dir string) error {
	_, err := ioutil.ReadDir(dir)
	if err != nil {
		return err
	}
	return nil
}

	return nil
}

// removeEmptyDirs works backwards from endDir to baseDir and removes each directory
// if it is empty.  It stops once it encounters a directory that has content
func removeEmptyDirs(baseDir, endDir string) error {
	if !mount.PathWithinBase(endDir, baseDir) {
		return fmt.Errorf("endDir %q is not within baseDir %q", endDir, baseDir)
	}

	for curDir := endDir; curDir != baseDir; curDir = filepath.Dir(curDir) {

	{"crypto.Decrypter", "type Decrypter interface{Decrypt(rand io.Reader, msg []byte, opts DecrypterOpts) (plaintext []byte, err error); Public() PublicKey}"},
	{"encoding.BinaryMarshaler", "type BinaryMarshaler interface{MarshalBinary() (data []byte, err error)}"},
	{"io.Reader", "type Reader interface{Read(p []byte) (n int, err error)}"},
	{"io.ReadWriter", "type ReadWriter interface{Reader; Writer}"},

	for len(next) > 0 {
		this, next = next, this[0:0]
		for _, dir := range this {
			fd, err := os.Open(dir)
			if err != nil {
				log.Print(err)
				continue
			}
			entries, err := fd.Readdir(0)
			fd.Close()
			if err != nil {
				log.Print(err)
				continue
			}
			hasGoFiles := false
			for _, entry := range entries {
				name := entry.Name()