Migrates a repository from GitLab to GitHub, preserving history and branches.

.env

GITHUB_ORGANIZATION=my_github_org

migrate_repo_org.sh

#!/bin/bash

# Exit immediately if a command exits with a non-zero status
set -e

# Load .env file if it exists
if [ -f .env ]; then
  export $(grep -v '^#' .env | xargs)
fi

# Function to display usage information
usage() {
  echo "Usage: $0 <gitlab_project_url> [<github_repo>]"
  echo "Example: $0 ssh://git@mygitlab:8022/project/myproject.git project-myproject"
  echo "If <github_repo> is not provided, it will be derived from <gitlab_project_url>."
  exit 1
}

# Check if at least the GitLab project URL is provided
if [ "$#" -lt 1 ]; then
  usage
fi

GITLAB_PROJECT_URL=$1
GITHUB_REPO=$2

# Check if GITHUB_ORGANIZATION is set
if [ -z "$GITHUB_ORGANIZATION" ]; then
  echo "GITHUB_ORGANIZATION is not set. Please set it in the .env file."
  exit 1
fi

# Extract the GitLab repo path from the provided URL
GITLAB_REPO_PATH=$(echo $GITLAB_PROJECT_URL | sed 's|ssh://git@||' | sed 's|:[0-9]*/|/|')

# Derive the GitHub repo name if not provided
if [ -z "$GITHUB_REPO" ]; then
  GITHUB_REPO=$(basename ${GITLAB_REPO_PATH} .git)
  # Transform the GitHub repo name as needed (replace slashes with dashes)
  GITHUB_REPO=${GITHUB_REPO//\//-}
fi

# Clone the GitLab repository as a mirror
echo "Cloning the GitLab repository..."
git clone --mirror ${GITLAB_PROJECT_URL}

REPO_NAME=$(basename ${GITLAB_REPO_PATH} .git)

cd ${REPO_NAME}.git

# Add the GitHub repository as a new remote
echo "Adding GitHub as a remote..."
git remote add github [email protected]:${GITHUB_ORGANIZATION}/${GITHUB_REPO}.git

# Push all branches and tags to GitHub
echo "Pushing to GitHub..."
git push --mirror github

echo "Migration completed successfully."

# Clean up by removing the local mirror repository
cd ..
rm -rf ${REPO_NAME}.git

echo "Local repository removed."