メモ git管理しているプロジェクトに別のリポジトリをgit cloneしたいとき

リモートから新たに何かクローンしたい

既にgit initされているフォルダに別のモジュールをリモートからクローンしてくる場合を考える

$ git clone https://github.com/usr/something

これでクローンされた。
statusを見てみる

$ git status

Untracked files:
  (use "git add <file>..." to include in what will be committed)
    something/

git addすると警告が出る

$ git add .
warning: adding embedded git repository: something
hint: You've added another git repository inside your current repository.
hint: Clones of the outer repository will not contain the contents of
hint: the embedded repository and will not know how to obtain it.
hint: If you meant to add a submodule, use:
hint:
hint:   git submodule add <url> something
hint:
hint: If you added this path by mistake, you can remove it from the
hint: index with:
hint:
hint:   git rm --cached something
hint:
hint: See "git help submodule" for more information.

入っている様に見えるが、中身は空！

$ git status
On branch master
Your branch is up to date with 'origin/master'.

Changes to be committed:
  (use "git restore --staged <file>..." to unstage)
    new file:   something #この中身が空！

別リポジトリからクローンしてきた.gitを消して下記コマンドで解決

$ rm -rf something/.git
$ git rm -f --cached something
$ git add .
$ git status
On branch master
Your branch is up to date with 'origin/master'.

Changes to be committed:
  (use "git restore --staged <file>..." to unstage)
    new file:   something/.env.example
    new file:   something/.gitignore
    new file:   something/LICENSE
    new file:   something/Makefile
    new file:   something/README.md
    new file:   something/db/log/.gitignore
    new file:   something/db/my.cnf
    new file:   something/docker-compose.yml
    new file:   something/php/Dockerfile
    new file:   something/php/php.ini
    new file:   something/web/default.conf