regenerate_git_submodules.sh

#!/bin/bash

# Check that we are in a git repository. Will help avoid reckless recursion through files.
git_dir=$(git rev-parse --show-toplevel) && is_git_dir=1
[ -z $is_git_dir ] && {
	echo "Must execute inside a git repository"
	exit
}
echo "Git repository: $git_dir"

# Don't run this if there are unsaved modifications to the repository.
# Just trying to avoid doing something bad on accident
git_status=$(git status --porcelain --untracked-files=no)
[ "$git_status" ] && {
	echo "There are unsaved modifications to the repository"
	echo "Please run git commit or git stash so we can continue with our business"
	exit
}

# Let's remove any existing submodules or git links (aka bad submodules)
result=$(git ls-files --stage | grep 160000 | awk '{print $4}')
for folder in $result; do
	echo "Remove: $folder"
	git rm --cached $folder
done

# Let's find all our submodules and add them
sub_gits=$(find $git_dir -name .git -type d -prune)
for unparsed_git_module in $sub_gits; do
	git_module=$(echo $unparsed_git_module | sed "s#^$git_dir/##" | sed "s/.git$//")
	[ -z $git_module ] && {
		echo "SKIP: $unparsed_git_module"
		continue
	}
	cd $unparsed_git_module
	origin=$(git remote show -n origin | grep "Fetch URL:" | awk '{print $3}')
	cd $git_dir
	echo "ADD"
	echo "	ORIGIN: $origin"
	echo "	MODULE: $git_module"
	git submodule add $origin $git_module
done

# Check to see if anything changed
git_status=$(git status --porcelain --untracked-files=no)
[ "$git_status" ] && {

	echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
	echo "         !!! HUMAN !!!         "
	echo "      Commit your changes      "
	echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
	exit
}

echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
echo "     No changes were made      "
echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"