Extract repo folder into a new repo

git-move-folder-with-history.sh

#!/usr/bin/env bash

# ATTENTION
# This script is incomplete, we would still need to add a way to provide the paths where the files we want to keep have been before.
# Alternatively, we could change the script to remove all files that are not under the path we specify,
# the code is already there, we just need to adjust and test.

# Usage: ./git-move.sh [email protected]:My/source-repo.git [email protected]:My/destination-repo.git my/path/to/keep

SOURCE_REPO=${1}
DEST_REPO=${2}
DIR_TO_KEEP=${3}

SOURCE_REPO_DIR='source_repo'
DEST_REPO_DIR='dest_repo'
SOURCE_REPO_BRANCH='filtered_code'
DEST_REPO_BRANCH='transfered_code'

echo 
echo 
echo "Cloning source repo..."
git clone ${SOURCE_REPO} ${SOURCE_REPO_DIR}

echo 
echo 
echo "Removing what we don't want to keep..."
cd ${SOURCE_REPO_DIR}
git remote rm origin
git checkout -b ${SOURCE_REPO_BRANCH}


echo "Filtering in what we want to keep..."
git filter-repo --force \
    --path "${DIR_TO_KEEP}" \
    --path app/Core/Port/AuditLog \
    --path app/Core/Port/CircuitBreaker \
    --path app/Core/Port/CommandBus \
    --path app/Core/Port/Framework \
    --path app/Core/Port/EventBus \
    --path app/Core/Port/MessageBus \
    --path app/Core/Port/QueryBus \
    --path app/Core/Port/RateLimiter \
    --path app/Infrastructure\AuditLog\Laravel \
    --path app/Infrastructure\CircuitBreaker\Laravel \
    --path app/Infrastructure\CommandBus\Laravel \
    --path app/Infrastructure\Framework\Laravel \
    --path app/Infrastructure\EventBus\Laravel \
    --path app/Infrastructure\MessageBus\Laravel \
    --path app/Infrastructure\QueryBus\Laravel \
    --path app/Infrastructure\RateLimiter\Laravel \
    --path tests/Integration/Infrastructure/AuditLog/Laravel \
    --path tests/Integration/Infrastructure/CircuitBreaker/Laravel \
    --path tests/Integration/Infrastructure/CommandBus/Laravel \
    --path tests/Integration/Infrastructure/Framework/Laravel \
    --path tests/Integration/Infrastructure/EventBus/Laravel \
    --path tests/Integration/Infrastructure/MessageBus/Laravel \
    --path tests/Integration/Infrastructure/Monitoring/Prometheus \
    --path tests/Integration/Infrastructure/QueryBus/Laravel \
    --path tests/Integration/Infrastructure/RateLimiter/Laravel

echo "Removing from history leftover files..."
#git filter-repo --path file1.txt --path dir/file2.log --invert-paths
# Find all files under $PARENT except those under $KEEP
find "./" -type f ! -path "./.git/*" ! -path "./${DIR_TO_KEEP}/*" > /tmp/files_to_remove.txt
# remove `./` from the beginning of every path
sed -i 's|^\./||' /tmp/files_to_remove.txt
# Run git filter-repo to remove those files from history
git filter-repo $(cat /tmp/files_to_remove.txt | sed 's/^/--path /') --invert-paths --force

cd .. # back to root

echo 
echo 
echo "Finished preparing source!"

echo 
echo 
echo "Creating destination repo..."
git clone ${DEST_REPO} ${DEST_REPO_DIR}
cd ${DEST_REPO_DIR}
git checkout -b ${DEST_REPO_BRANCH}

echo 
echo 
echo "Copying what want to keep into the new repository..."
git remote add local_source_repo ../${SOURCE_REPO_DIR}
git fetch local_source_repo
git merge local_source_repo/${SOURCE_REPO_BRANCH} --allow-unrelated-histories

echo 
echo 
echo "Finished!"
echo
echo "Now you just need to push to origin."