#! /bin/sh
# See https://stackoverflow.com/a/77950870/7976758
set -e

# To the top-level directory of the current submodule
cd "`git rev-parse --show-toplevel`"

unset GIT_DIR

# If .git/ subdirectory is already here
[ -d .git ] && exit 0

if ! [ -f .git ]; then
    echo "Error: Cannot find gitlink, aborting" >&2
    exit 1
fi

# Fix core.worktree now
git config --unset core.worktree

read _gitdir gitpath < .git
if [ "$_gitdir" != gitdir: ]; then
    echo "Error: Bad gitlink, aborting" >&2
    exit 1
fi
unset _gitdir
rm .git
exec mv "$gitpath" .git