Mirror entire git repo -- all branches, tags, and notes

git-mirror.sh

#!/bin/sh
# Mirrors an entire repo with al tags and branches.
# Based off this article.
# https://www.edwardthomson.com/blog/mirroring_git_repositories.html

set -eufo pipefail

if [ "$#" -lt 1 ]; then
    echo "usage: $0 SOURCE_REPO_URL [PACKAGED_NAME]" >&2
    exit 1
fi

SOURCE_URL="$1"
if [ -z "${2:-}" ]; then
  REPONAME="$(basename "$SOURCE_URL")-mirror"
else
  REPONAME="$2"
fi
TMP_ROOT="$(mktemp -d)"
WORKDIR="${TMP_ROOT}/${REPONAME}"
mkdir -p "$WORKDIR"
WORKDIR="$(cd "$WORKDIR"; pwd -P)"

echo "Cloning from ${SOURCE_URL} into ${WORKDIR}..."

HERE="$PWD"
cd "${WORKDIR}"
git init --bare .

git config remote.origin.url "${SOURCE_URL}"
git config --add remote.origin.fetch '+refs/heads/*:refs/heads/*'
git config --add remote.origin.fetch '+refs/tags/*:refs/tags/*'
git config --add remote.origin.fetch '+refs/notes/*:refs/notes/*'
git config remote.origin.mirror true
git fetch --all

echo ''
echo "Cloned to ${WORKDIR}"
echo ''

ZIP_FILE="${REPONAME}.zip"
cd ..
zip -r "$ZIP_FILE" "$REPONAME"
mv "$ZIP_FILE" "${HERE}/"
rm -rf "$TMP_ROOT"

echo ''
echo "Mirrored repo zipped into ${PWD}/${ZIP_FILE}"
echo 'Upload with: git push --mirror TARGET_URL'
echo ''
echo 'Done.'