Convert git submodules to git subtrees

subtrees.sh

#!/bin/bash -x
# This script will convert all your git submodules into git subtrees.
# This script ensures that your new subtrees point to the same commits as the
# old submodules did, unlike most other scripts that do this.
# THIS SCRIPT MUST BE PLACED OUTSIDE OF YOUR REPOSITORY!!!!!!!!!!
# Otherwise, the script will interfere with the git commits (unless you add it to .gitignore).
# Save the script in your home directory as `~/subtrees.sh`
# `cd` into your repository
# Run `~/subtrees.sh`
# Enjoy!

# extract the list of submodules from .gitmodule
cat .gitmodules |while read i
do
if [[ $i == \[submodule* ]]; then
    echo converting $i

	read i

    # extract the module's prefix
    mpath=$(echo $i | grep -E "(\S+)$" -o)

	echo path: $mpath

    read i

    # extract the url of the submodule
    murl=$(echo $i|cut -d\= -f2|xargs)

	echo url: $murl

    # extract the module name
    mname=$(basename $mpath)

	echo name: $mname

	# extract the referenced commit
	mcommit=$(git submodule status $mpath | grep -E "\S+" -o | head -1)

	echo commit: $mcommit

    # deinit the module
    git submodule deinit $mpath

    # remove the module from git
    git rm -r --cached $mpath

    # remove the module from the filesystem
    rm -rf $mpath

    # commit the change
    git commit -m "Removed $mpath submodule at commit $mcommit"

    # add the remote
    git remote add -f $mname $murl

    # add the subtree
    git subtree add --prefix $mpath $mcommit --squash

	# commit any left over uncommited changes
	git commit -a -m "$mname cleaned up"

    # fetch the files
    git fetch $murl master

	echo
fi
done
git rm .gitmodules
git commit -a -m "Removed .gitmodules"