git-merge-subtree.sh

#!/bin/sh

PROJECTNAME="$1"
DESTPATH="$2"
GITURL="$3"
VERSION="$4"

git remote add -f $PROJECTNAME $GITURL
git merge -s ours --no-commit $PROJECTNAME/$VERSION
git read-tree --prefix=$DESTPATH -u $PROJECTNAME/$VERSION
git commit -m "Merge $PROJECTNAME project as our subdirectory"
git pull -s subtree $PROJECTNAME $VERSION