Shell Script to Merge Multiple Git Repositories via Subtree Merge

create_repo.sh

#! /bin/sh

# based on https://help.github.com/articles/working-with-subtree-merge
# Copyright (c) 2014 Daniel Sager
# License: MIT, https://gist.github.com/dsager/0edcbf806b5b86e78455#file-2014

REPOS="front-end back-end"
BRANCHES="develop master"
DIR="monolith"

# create a new repo
mkdir ${DIR}
cd ${DIR}
git init
echo "# ONE" >> README.md
git add README.md
git commit -m "initial commit"

# create branches
for branch in ${BRANCHES}; do
    git checkout -b ${branch}
done

for repo in ${REPOS}; do
    echo "++++++++++++++++++++++++++++++++++++++++++++++++++++"
    echo "+ setting up ${repo}"
    echo "++++++++++++++++++++++++++++++++++++++++++++++++++++"
    remote="git@github.com:Devex/${repo}.git"
    git remote add -f ${repo} ${remote}
    for branch in ${BRANCHES}; do
        echo "--------------------------------------------------"
        echo "- merging ${repo}/${branch}"
        echo "--------------------------------------------------"
        git checkout ${branch}
        git merge -s ours --no-commit ${repo}/${branch}
        git read-tree --prefix=${repo}/ -u ${repo}/${branch}
        git commit -m "Subtree merged in ${repo}"
    done
done