Could not set User for git since the check used grep_bin instead of grep_cmd

Not sure if moving the variables out of binaries caused this: fb191c310f83c7f552f6d5a4dfeb803c44f6ca54 to actually be a problem

Or if the original refactoring to use the right path for ArchLinux: 8bda888fb6fad844fff563919a4b51a28a51279a never actually worked for user.pp