prow/cmd/phaino/local.go
func findRepo(wd, path string) (string, error) {
	opwd, err := realPath(wd)
	if err != nil {
		return "", fmt.Errorf("wd not found: %v", err)
	}
	if strings.HasPrefix(path, "github.com/kubernetes/") {
		path = strings.Replace(path, "github.com/kubernetes/", "k8s.io/", 1)
	}

	var old string
	pwd := opwd
	for old != pwd {
		old = pwd
		if strings.HasSuffix(pwd, "/"+path) {
			return pwd, nil
		}
		pwd = filepath.Dir(pwd)
	}
	pwd = opwd
	for old != pwd {
		old = pwd
		check := filepath.Join(pwd, path)
		if info, err := os.Stat(check); err == nil && info.IsDir() {
			return check, nil
		}
		pwd = filepath.Dir(pwd)
	}

	base := filepath.Base(path)
	pwd = opwd
	for old != pwd {
		old = pwd
		check := filepath.Join(pwd, base)
		if info, err := os.Stat(check); err == nil && info.IsDir() {
			return check, nil
		}
		pwd = filepath.Dir(pwd)
	}
	return "", errors.New("cannot find repo")
}
func findRepo(wd, path string) (string, error) {
	opwd, err := realPath(wd)
	if err != nil {
		return "", fmt.Errorf("wd not found: %v", err)
	}
	if strings.HasPrefix(path, "github.com/kubernetes/") {
		path = strings.Replace(path, "github.com/kubernetes/", "k8s.io/", 1)
	}

	var old string
	pwd := opwd
	for old != pwd {
		old = pwd
		if strings.HasSuffix(pwd, "/"+path) {
			return pwd, nil
		}
		pwd = filepath.Dir(pwd)
	}
	pwd = opwd
	for old != pwd {
		old = pwd
		check := filepath.Join(pwd, path)
		if info, err := os.Stat(check); err == nil && info.IsDir() {
			return check, nil
		}
		pwd = filepath.Dir(pwd)
	}

	base := filepath.Base(path)
	pwd = opwd
	for old != pwd {
		old = pwd
		check := filepath.Join(pwd, base)
		if info, err := os.Stat(check); err == nil && info.IsDir() {
			return check, nil
		}
		pwd = filepath.Dir(pwd)
	}
	return "", errors.New("cannot find repo")
}
// findRepo will attempt to find a repo in logical locations under path.
//
// It will first try to find foo/bar somewhere under $PWD or a $PWD dir.
// AKA if $PWD is /go/src it will match /go/src/foo/bar, /go/foo/bar or /foo/bar
// Next it will look for the basename somewhere under $PWD or a $PWD dir.
// AKA if $PWD is /go/src it will match /go/src/bar, /go/bar or /bar
// If both of these strategies fail it will return an error.