func Quiet(args ...string) bool {
cmd := gitCmd(args...)
return cmd.Success()
}
func IsGitDir(dir string) bool {
cmd := cmd.New("git")
cmd.WithArgs("--git-dir="+dir, "rev-parse", "--git-dir")
return cmd.Success()
}
func (r *Range) IsAncestor() bool {
cmd := gitCmd("merge-base", "--is-ancestor", r.A, r.B)
return cmd.Success()
}