Migrate bitbucket repositories to GitHub

migrate-bitbucket.sh

#!/usr/bin/env bash
set -euo pipefail
# usage (assuming the `gh` CLI is installed and you're authenticated):
#
#
# BB_WORKSPACE=your_bitbucket_workspace \
# GH_OWNER=your_github_username \
# ./migrate-bitbucket.sh repos.txt

# ----------------------------
# Config (edit these)
# ----------------------------
DEFAULT_PRIVATE="true"                   # true/false
REPO_LIST_FILE="${1:-repos.txt}"

# Optional: use a specific ssh key / host alias by configuring ~/.ssh/config.
# e.g., BITBUCKET_HOST="bitbucket-work" if you set Host bitbucket-work -> bitbucket.org
BITBUCKET_HOST="bitbucket.org"
GITHUB_HOST="github.com"

create_github_repo() {
  local repo="$1"

  gh repo create $repo --private

  echo "✅ Created GitHub repo: ${GH_OWNER}/${repo}"
}

migrate_repo() {
  local repo="$1"
  local tmpdir
  tmpdir="$(mktemp -d)"

  # SSH clone URLs
  # Bitbucket: git@bitbucket.org:WORKSPACE/repo.git
  local bb_url="git@${BITBUCKET_HOST}:${BB_WORKSPACE}/${repo}.git"

  # GitHub: git@github.com:OWNER/repo.git
  local gh_url="git@${GITHUB_HOST}:${GH_OWNER}/${repo}.git"

  echo
  echo "=============================="
  echo "Migrating: ${repo}"
  echo "  From: ${bb_url}"
  echo "  To:   ${gh_url}"
  echo "=============================="

  create_github_repo "$repo"

  echo "⬇️  Cloning from Bitbucket (mirror over SSH)..."
  git clone --mirror "$bb_url" "${tmpdir}/${repo}.git"

  echo "⬆️  Pushing to GitHub (mirror over SSH)..."
  (cd "${tmpdir}/${repo}.git" && git push --mirror "$gh_url")

  echo "✅ Done: ${repo}"
  rm -rf "$tmpdir"
}

# ----------------------------
# Main
# ----------------------------
if [[ ! -f "$REPO_LIST_FILE" ]]; then
  echo "Repo list file not found: $REPO_LIST_FILE"
  echo "Usage: $0 repos.txt"
  exit 1
fi
: "${BB_WORKSPACE:?BB_WORKSPACE must be set (export BB_WORKSPACE=...)}"
: "${GH_OWNER:?GH_OWNER must be set (export GH_OWNER=...)}"

# Basic SSH sanity checks (won't fail the script if your server prints banners)
echo "🔐 Checking SSH connectivity (non-fatal)..."
ssh -o BatchMode=yes -o ConnectTimeout=5 "git@${BITBUCKET_HOST}" -T >/dev/null 2>&1 || true
ssh -o BatchMode=yes -o ConnectTimeout=5 "git@${GITHUB_HOST}" -T >/dev/null 2>&1 || true

echo "Found repositories to migrate:"
found_any=false

while IFS= read -r repo; do
  # Skip blank lines and comments
  [[ -z "$repo" || "$repo" =~ ^[[:space:]]*# ]] && continue

  found_any=true
  migrate_repo "$repo"
done < "$REPO_LIST_FILE"

if [[ "$found_any" != "true" ]]; then
  echo "No repositories found in $REPO_LIST_FILE"
  exit 0
fi

echo
echo "🎉 All migrations complete."