I mostly use `ghq` to clone repositories (and have a few `fzf` aliases based on that, like `ghqcd` to `cd` to some repo)

    [ghq] # https://github.com/x-motemen/ghq#configuration
        root = ~/dev

Sometimes, from my personal machine, I need to check something work-related ; then on my personal machine, I checkout in `~/dev/myorganization/`. Inversely, it happens sometimes that at work I need something I wrote for myself ; then on my work machine, I checkout in `~/dev/myusername/`.

This allows me to use `gitdir:` rules that handle anything `~/dev`, and I have fallbacks for everything else (who never checkouts in `tmp`?).

    #
    # Superman vs Clark Kent
    #
    # Debug Includes with: git config --list --show-origin

    # the default identity, for checkouts outside of `~/dev`
    [include]
        path = ~/.config/git/gitconfig-default

    # on my work machine, this defines Clark Kent ; on my personal machine, this defines Superman (or is  it the reverse?)
    # this one is not commited in my dotfiles
    [include]
        path = ~/.config/git/gitconfig-local

    # work-related repos on personal machine
    [includeIf "gitdir:/home/myusername/dev/myorganization/"]
        path = ~/.config/git/gitconfig-myorganization
    [includeIf "gitdir:/home/myusername/dev/gitlab.com/myorganization/"]
        path = ~/.config/git/gitconfig-myorganization

    # personal repos on my work machine
    [includeIf "gitdir:/home/myusername/dev/myusername/"]
        path = ~/.config/git/gitconfig-myusername
    [includeIf "gitdir:/home/myusername/dev/gitlab.com/myusername-namespace/"]
        path = ~/.config/git/gitconfig-myusername

This works nicely since years^W `includeIf` was a thing.

However, there are situations at work where I'm on a server where I didn't created `~/.config/git/gitconfig-local` (which is a manual step I always forget) and any commit from `/usr/local/src/something/` will end up configured with Superman identity.

I found out about `hasconfig:` some time ago, and took note of it for when the option would hit `git` from Debian Stable ; your comment comes the day after I accidentaly commited as Superman on some work repo checked outside of `~/dev/`. Time to add more rules!