VCS_INFO_git_detect() { #{{{
    if VCS_INFO_check_com git && git rev-parse --is-inside-work-tree &> /dev/null ; then
        vcs_comm[gitdir]="$(git rev-parse --git-dir 2> /dev/null)" || return 1
        if   [[ -d ${vcs_comm[gitdir]}/svn ]]             ; then vcs_comm[overwrite_name]='git-svn'
        elif [[ -d ${vcs_comm[gitdir]}/refs/remotes/p4 ]] ; then vcs_comm[overwrite_name]='git-p4' ; fi
        return 0
    fi
    return 1
}