Git is_submodule function

gistfile1.sh

function is_submodule() {
    # Find out if the parent directory of our current git repo is also a git repo
    parent_git=`cd "$_git_dir/.." && git rev-parse --show-toplevel 2> /dev/null`
    if [[ -n $parent_git ]]; then
        # If it is, list all submodules of the parent
        submodules=`cd $parent_git && git submodule --quiet foreach 'echo $path'`
        for line in $submodules; do
            # cd to each directory, if it matches our current git repo then we are in a submodule
            cd "$parent_git/$line"
            if [[ `pwd` = $_git_dir ]]; then return 0; fi
        done
    fi
    return 1
}


# Usage
if is_submodule; then
    echo "In a submodule!"
else
    echo "Not in a submodule"
fi