How can I tell Git to use a different gitignore file than “.gitignore”?

Question

I can tell Git where the Git repository is with --git-dir. I can tell Git where the working tree is with --work-tree. How do I tell Git where the g

Answer 1

Each repository has an info/exclude file - there should be one in .git/info/exclude and in .git.sync/info/exclude. Populate those exclude files just as you would .gitignore.