cd firstRepo
git remote add other path/to/otherRepo
git fetch other
git checkout -b otherRepoBranch other/master
echo"`git rev-list otherRepoBranch | tail -n 1` `git rev-list master | head -n 1`">> .git/info/grafts
git rebase otherRepoBranch master

git remote add temp staging_path/(reponame)
git fetch temp
git fetch --tags temp ## optional -- may pull in additional history
for remote in $(git branch -r | grep temp/ ) ; do git branch --no-track imported_$(basename $remote) $remote ; done ## create local branches prefixed with 'imported_'
git remote rm temp ## optional -- assumes you no longer plan to use the source repo

git merge -s ours --no-commit imported_master ## mysterious"merge strategy"
git read-tree -u --prefix=(reponame)/ imported_master ## move to sub-folder
git commit

#!/bin/bash
#
################################################################################
## Script to merge multiple git repositories into a new repository
## - The new repository will contain a folder for every merged repository
## - The script adds remotes for every project and then merges in every branch
##   and tag. These are renamed to have the origin project name as a prefix
##
## Usage: mergeGitRepositories.sh <new_project> <my_repo_urls.lst>
## - where <new_project> is the name of the new project to create
## - and <my_repo_urls.lst> is a file contaning the URLs to the respositories
##   which are to be merged on separate lines.
##
## Author: Robert von Burg
##            [email protected]
##
## Version: 0.2.0
## Created: 2015-06-17
##
################################################################################
#

# disallow using undefined variables
shopt -s -o nounset

# Script variables
declare SCRIPT_NAME="${0##*/}"
declare SCRIPT_DIR="$(cd ${0%/*} ; pwd)"
declare ROOT_DIR="$PWD"


# Detect proper usage
if ["$#" -ne"2" ] ; then
  echo -e"ERROR: Usage: $0 <new_project> <my_repo_urls.lst>"
  exit 1
fi


# Script functions
function failed() {
  echo -e"ERROR: Merging of projects failed:"
  echo -e"$1"
  exit 1
}

function commit_merge() {
  current_branch="$(git symbolic-ref HEAD 2>/dev/null)"
  CHANGES=$(git status | grep"working directory clean")
  MERGING=$(git status | grep"merging")
  if [["$CHANGES" !="" ]] && [["$MERGING" =="" ]] ; then
    echo -e"INFO:   No commit required."
  else
    echo -e"INFO:   Committing ${sub_project}..."
    if ! git commit --quiet -m"[Project] Merged branch '$1' of ${sub_project}" ; then
      failed"Failed to commit merge of branch '$1' of ${sub_project} into ${current_branch}"
    fi
  fi
}


## Script variables
PROJECT_NAME="${1}"
PROJECT_PATH="${ROOT_DIR}/${PROJECT_NAME}"
REPO_FILE="${2}"
REPO_URL_FILE="${ROOT_DIR}/${REPO_FILE}"


# Make sure the REPO_URL_FILE exists
if [ ! -e"${REPO_URL_FILE}" ] ; then
  echo -e"ERROR: Repo file ${REPO_URL_FILE} does not exist!"
  exit 1
fi


# Make sure the required directories don't exist
if [ -e"${PROJECT_PATH}" ] ; then
  echo -e"ERROR: Project ${PROJECT_NAME} already exists!"
  exit 1
fi


# create the new project
echo -e"INFO: Creating new git repository ${PROJECT_NAME}..."
echo -e"===================================================="
cd ${ROOT_DIR}
mkdir ${PROJECT_NAME}
cd ${PROJECT_NAME}
git init
echo"Initial Commit"> initial_commit
# Since this is a new repository we need to have at least one commit
# thus were we create temporary file, but we delete it again.
# Deleting it guarantees we don't have conflicts later when merging
git add initial_commit
git commit --quiet -m"[Project] Initial Master Repo Commit"
git rm --quiet initial_commit
git commit --quiet -m"[Project] Initial Master Repo Commit"
echo


# Merge all projects into th branches of this project
echo -e"INFO: Merging projects into new repository..."
echo -e"===================================================="
for url in $(cat ${REPO_URL_FILE}) ; do

  # extract the name of this project
  export sub_project=${url##*/}
  sub_project=${sub_project%*.git}

  echo -e"INFO: Project ${sub_project}"
  echo -e"----------------------------------------------------"

  # Fetch the project
  echo -e"INFO:   Fetching ${sub_project}..."
  git remote add"${sub_project}""${url}"
  if ! git fetch --no-tags --quiet ${sub_project} 2>/dev/null ; then
    failed"Failed to fetch project ${sub_project}"
  fi

  # add remote branches
  echo -e"INFO:   Creating local branches for ${sub_project}..."
  while read branch ; do
    branch_ref=$(echo $branch | tr"""\t" | cut -f 1)
    branch_name=$(echo $branch | tr"""\t" | cut -f 2 | cut -d / -f 3-)

    echo -e"INFO:   Creating branch ${branch_name}..."

    # create and checkout new merge branch off of master
    git checkout --quiet -b"${sub_project}/${branch_name}" master
    git reset --hard --quiet
    git clean -d --force --quiet

    # Merge the project
    echo -e"INFO:   Merging ${sub_project}..."
    if ! git merge --quiet --no-commit"remotes/${sub_project}/${branch_name}" 2>/dev/null ; then
      failed"Failed to merge branch 'remotes/${sub_project}/${branch_name}' from ${sub_project}"
    fi

    # And now see if we need to commit (maybe there was a merge)
    commit_merge"${sub_project}/${branch_name}"

    # relocate projects files into own directory
    if ["$(ls)" =="${sub_project}" ] ; then
      echo -e"WARN:   Not moving files in branch ${branch_name} of ${sub_project} as already only one root level."
    else
      echo -e"INFO:   Moving files in branch ${branch_name} of ${sub_project} so we have a single directory..."
      mkdir ${sub_project}
      for f in $(ls -a) ; do
        if  [["$f" =="${sub_project}" ]] ||
            [["$f" =="." ]] ||
            [["$f" ==".." ]] ; then
          continue
        fi
        git mv -k"$f""${sub_project}/"
      done

      # commit the moving
      if ! git commit --quiet -m "[Project] Move ${sub_project} files into sub directory" ; then
        failed"Failed to commit moving of ${sub_project} files into sub directory"
      fi
    fi
    echo
  done < <(git ls-remote --heads ${sub_project})


  #&nbsp;checkout master of sub probject
  if ! git checkout"${sub_project}/master" 2>/dev/null ; then
    failed"sub_project ${sub_project} is missing master branch!"
  fi

  # copy remote tags
  echo -e"INFO:   Copying tags for ${sub_project}..."
  while read tag ; do
    tag_ref=$(echo $tag | tr"""\t" | cut -f 1)
    tag_name=$(echo $tag | tr"""\t" | cut -f 2 | cut -d / -f 3)

    # hack for broken tag names where they are like 1.2.0^{} instead of just 1.2.0
    tag_name="${tag_name%%^*}"

    tag_new_name="${sub_project}/${tag_name}"
    echo -e"INFO:     Copying tag ${tag_name} to ${tag_new_name} for ref ${tag_ref}..."
    if ! git tag"${tag_new_name}""${tag_ref}" 2>/dev/null ; then
      echo -e"WARN:     Could not copy tag ${tag_name} to ${tag_new_name} for ref ${tag_ref}"
    fi
  done < <(git ls-remote --tags ${sub_project})

  # Remove the remote to the old project
  echo -e"INFO:   Removing remote ${sub_project}..."
  git remote rm ${sub_project}

  echo
done


# Now merge all project master branches into new master
git checkout --quiet master
echo -e"INFO: Merging projects master branches into new repository..."
echo -e"===================================================="
for url in $(cat ${REPO_URL_FILE}) ; do

  # extract the name of this project
  export sub_project=${url##*/}
  sub_project=${sub_project%*.git}

  echo -e"INFO:   Merging ${sub_project}..."
  if ! git merge --quiet --no-commit"${sub_project}/master" 2>/dev/null ; then
    failed"Failed to merge branch ${sub_project}/master into master"
  fi

  # And now see if we need to commit (maybe there was a merge)
  commit_merge"${sub_project}/master"

  echo
done


# Done
cd ${ROOT_DIR}
echo -e"INFO: Done."
echo

exit 0

  [email protected]:eitchnet/ch.eitchnet.parent.git
  [email protected]:eitchnet/ch.eitchnet.utils.git
  [email protected]:eitchnet/ch.eitchnet.privilege.git

  ./mergeGitRepositories.sh eitchnet_test eitchnet.lst

cd firstRepo
git remote add other path/to/otherRepo
git fetch other
git checkout -b merged
git merge --allow-unrelated-histories other/master

git checkout master
git merge otherRepoBranch

# Make a bare clone of the external repo to a local directory without a working directory
git clone --bare https://githost.org/extuser/repo.git

# now push all history and repo to new repo
cd repo.git
git push --mirror https://github.com/ghuser/repo.git # Push mirror to new GitHub repo

cd ..
rm -rf repo.git # Remove temporary local repo