src/server/pfs/pfs.go
func IsBranchNotFoundErr(err error) bool {
	if err == nil {
		return false
	}
	return branchNotFoundRe.MatchString(err.Error())
}
func IsBranchNotFoundErr(err error) bool {
	if err == nil {
		return false
	}
	return branchNotFoundRe.MatchString(err.Error())
}
// IsBranchNotFoundErr returns true if 'err' is an error message about a
// branch not being found