Mirror/clone repo for offline mirror

mirror.sh

#!/bin/sh
# Derived from:
# https://www.edwardthomson.com/blog/mirroring_git_repositories.html

# Mirrors repo and zips it up for easy transport to offline network

set -eufo pipefail

if [ "$#" -ne 1 ]; then
    echo "usage: $0 source_repo_url" >&2
    exit 1
fi

SOURCE_URL="$1"
REPONAME="$(basename "$SOURCE_URL")-mirror"
WORKDIR="$(mktemp -d)/${REPONAME}"
mkdir -p "$WORKDIR"

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

git init --bare "${WORKDIR}"
cd "${WORKDIR}"

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}"

ZIP_FILE="${REPONAME}.zip"
cd ..
zip -r "$ZIP_FILE" "$REPONAME"

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

rm -rf "${WORKDIR}"

echo "Done."