Git Author identity unknown / Please tell me who you are:这台 macOS 默认自动拼身份也能提交,要 useConfigOnly 才报错,优先级实测

    $ git commit -m first 2>&1 | head -8; git log --format='作者 %an <%ae> | 提交者 %cn <%ce>' -1
      [main (root-commit) 478c6eb] first
       Committer: <登录名> <<登录名>@<主机名>>
      Your name and email address were configured automatically based
      on your username and hostname. Please check that they are accurate.
      You can suppress this message by setting them explicitly. Run the
      following command and follow the instructions in your editor to edit
      your configuration file:
      
      作者 <登录名> <<登录名>@<主机名>> | 提交者 <登录名> <<登录名>@<主机名>>
    $ git config user.useConfigOnly true; git commit -m first    (退出码 128)
      Author identity unknown
      
      *** Please tell me who you are.
      
      Run
      
        git config --global user.email "you@example.com"
        git config --global user.name "Your Name"
      
      to set your account's default identity.
      Omit --global to set the identity only in this repository.
      
      fatal: no email was given and auto-detection is disabled
    $ git var GIT_AUTHOR_IDENT 2>&1    (退出码 128)
      Author identity unknown
      
      *** Please tell me who you are.
      
      Run
      
        git config --global user.email "you@example.com"
        git config --global user.name "Your Name"
      
      to set your account's default identity.
      Omit --global to set the identity only in this repository.
      
      fatal: no email was given and auto-detection is disabled
    $ git -c user.useConfigOnly=false var GIT_AUTHOR_IDENT 2>&1; hostname
      <登录名> <<登录名>@<主机名>> 1767196800 +0800
      <主机名>

  git add          退出码 0   OK
  git log          退出码 0   OK
  git commit       退出码 128 Author identity unknown
  git tag(轻量)      退出码 0   OK
  git tag -a       退出码 128 Committer identity unknown
  git stash        退出码 0   OK
  git revert       退出码 128 Author identity unknown
  git branch       退出码 0   OK

    $ git config --show-origin --get-all user.email | sed "s#<tmp>#<tmp>#"; git config --show-origin --get-all user.name | sed "s#$HOME#~#"
      file:<tmp>/_home/gitconfig	global@example.com
      file:.git/config	repo@example.com
      file:~/gitconfig	GlobalName
      file:.git/config	RepoName
  只有全局 + 仓库配置:
      作者 RepoName <repo@example.com> | 提交者 RepoName <repo@example.com>
  再加环境变量 GIT_AUTHOR_NAME / GIT_COMMITTER_EMAIL:
      作者 EnvAuthor <repo@example.com> | 提交者 RepoName <env-committer@example.com>
  同时有 GIT_AUTHOR_NAME=EnvAuthor 和 -c user.name=CliName:
      作者 EnvAuthor <repo@example.com> | 提交者 CliName <repo@example.com>
  --author 指定:
      作者 Other <other@example.com> | 提交者 RepoName <repo@example.com>

  在 work/proj 里提交:作者 Me <me@company.example> | 提交者 Me <me@company.example>
  在 personal 里提交:作者 Me <me@personal.example> | 提交者 Me <me@personal.example>
    $ git config --show-origin --get-all user.email | sed "s#<tmp>#<tmp>#"
      file:<tmp>/_home/gitconfig	me@personal.example

    $ git log --format='%h %an <%ae> %s'
      08506a7 Wrong <wrong@example.com> c3
      9d42fc5 Wrong <wrong@example.com> c2
      aeb44a3 Wrong <wrong@example.com> c1
    $ git config user.name Right; git config user.email right@example.com; git commit -q --amend --reset-author --no-edit; git log --format="%h %an <%ae> %s"
      fedd650 Right <right@example.com> c3
      9d42fc5 Wrong <wrong@example.com> c2
      aeb44a3 Wrong <wrong@example.com> c1
    $ git rebase -q -r --root --exec "git commit -q --amend --reset-author --no-edit" 2>&1 | tail -2; git log --format="%h %an <%ae> %s"
      24f0e89 Right <right@example.com> c3
      d1d18f9 Right <right@example.com> c2
      65d1ab9 Right <right@example.com> c1
  空字符串的身份:
    $ git config user.name ""; git commit -q --allow-empty -m e 2>&1 | tail -2
      
      fatal: empty ident name (for <right@example.com>) not allowed