Why use --git-dir?

Hello there

• I found that when executing SafeCmd，gitaly appends --git-dir to the args

https://gitlab.com/gitlab-org/gitaly/-/blob/master/internal/git/command.go#L43

• But in this doc, it tell me use git -C <path> if i just want to run git as if it was started in
• I found that in a bare repo, the results obtained by using git -c <path> shortlog and git --git-dir shortlog are very different

cd path and run git shortlog is same as git -c <path> shortlog

• I don't know which one is right

Can someone help me resolve this question?

Thanks!

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Reopen

I found another place, about command git rev-parse

If the HEAD in the repo points to a reference that does not exist,

--git-dir and -C will cause different output

This seems to be a git problem, but gitaly's processing may cause unexpected exceptions

https://gitlab.com/gitlab-org/gitaly/-/blob/master/internal/gitaly/service/ref/refs.go#L203