Tell git which SSH config file to use

Question

on command-line you can change your Git config for the current repository:

git config core.sshCommand "ssh -F ~/.ssh/system-a/config"

or in .git/config in your local repository to the [core] section:

sshCommand = "ssh -F ~/.ssh/system-a/config"

This works only with git 2.10 and newer. Otherwise, it needs to be set up using environment variable $GIT_SSH_COMMAND, for example like:

GIT_SSH_COMMAND="ssh -F ~/.ssh/system-a/config" git pull