How we merged multiple github repos into a monolithic project repo

cs_merge

#!/bin/bash
#
# This script merges all the repos we have into subfolders in a new repo
#

# Clones or copies a repository from either disc or remote repository.
cloppy() {
  local dir=$1
  if [[ -z $2 ]]; then
    local repo=$dir
  else
    local repo=$2
  fi

  if [[ -d ${dir}_bkp ]]; then
    cp -R ${dir}_bkp $dir
  else
    git clone git@github.com:casinosaga/casino-saga-$repo.git $dir
    cp -R $dir ${dir}_bkp
  fi
}

# Merges all the remote branches into sub folders
merge_repository() {
  local project=$1
  reorganize_branch
  cd ~/code/casino-saga
  git remote add $project ~/code/$project
  merge_repository_branches
}

# Merge all branches from one repository into the same branch name in the destination repository
merge_repository_branches() {
  cd ~/code/$project
  local -a branches=( $(git branch | sed "s/\*/ /" ) )
  echo "XXX Operate in $project on branches: ${branches[@]}"
  cd ~/code/casino-saga
  git fetch $project
  for branch in ${branches[@]}
  do
    create_branch $branch
    echo "XXX reset"
    git reset --hard
    echo "XXX git fetch $project"
    git fetch $project
    echo "XXX git merge $project/$branch"
    git merge $project/$branch -m "Merge history for $project/$branch into new repo"
  done
}

# Create a new EMPTY branch or checkout existing
create_branch() {
  echo "XXX Try creating orphaned branch $branch"
  git checkout --orphan $branch
  if [[ $? != 0 ]]; then
    echo "XXX $branch existed. Switch to it."
    git checkout $branch
  fi
}

# Moves all files in an existing repository into a new folder structure
reorganize_branch() {
  cd ~/code/$project
  git fetch --all
  local -a repo_branches=( $(git branch -r | tail -n+2 )  )
  for repo_branch in ${repo_branches[@]}
  do
    real_b=${repo_branch/origin\//}
    echo "XXX moving $project/$real_b into new structure"
    git checkout $real_b
    mkdir -p $project
    move_files_into_subfolder
    git commit -am "Prepare $project/$real_b for new structure (move files)"
  done
}

# Moves all files in an existing repository into a new subfolder named
# the same thing as the project we are working on.
move_files_into_subfolder() {
  local -a files=( $(ls -a) )
  for file in ${files[@]}
  do
    if [[ "$file" != "$project" && "$file" != ".git" && "$file" != ".." && "$file" != "." ]]; then
      git mv $file ./$project/
    fi
  done
}

# 1. Remove all old working directories
rm -rf ~/code/casino-saga/
rm -rf ~/code/api/
rm -rf ~/code/core/
rm -rf ~/code/web/
rm -rf ~/code/admin/
rm -rf ~/code/docs/

# 2. Clone the destination repository that will hold all the merged repos.
cd ~/code
git clone git@github.com:casinosaga/casino-saga.git

# 3. Clone or copy all the projects to merge into the master repo
cloppy core shared
cloppy api
cloppy admin backoffice
cloppy web
cloppy docs


# 4. Loop through all the projects and merge them one by one
projects=(core api admin web docs)
for project in ${projects[@]}
do
  merge_repository $project
done