Useful Git Scripts

submodule-add

#!/bin/bash
# Adds desired submodule to project at location and performs a shallow clone,
# Then it performs a sparse checkout with the files specified
set -e

usage() {
  echo
  echo "usage:    submodule-add https://gitremote.git vendor/mod"
  echo "Optionally you can pass desired files and folders to checkout as additional arguments..."
  echo "e.g.      submodule-add https://remoterepo.git submodule importantdir docker-compose.yml"
  echo
  exit
}

if [[ -z "$2" ]]; then
  usage
fi

validurl='(https?|ssh)://[-A-Za-z0-9\+&@#/%?=~_|!:,.;]*[-A-Za-z0-9\+&@#/%=~_|]'
if ! [[ "$1" =~ $validurl ]]; then
  echo "Invalid URL Specified!"
  usage
fi

URL="$1"
FOLDER="$2"

if [[ -z "$3" ]]; then
  echo "Which directories and files would you like to checkout (seperated by space)?"
  echo "Leave blank to for a full shallow checkout"
  read -a CHECKOUT
else
  CHECKOUT=( "${@:3}" )
fi

git submodule add --depth 2 "$URL" "$FOLDER"
cd "$FOLDER"

if [ -z "${CHECKOUT[0]}" ]; then
  echo "No parameters specified. Performing a full checkout."
  exit
else
  git config core.sparsecheckout true
  S=$(git rev-parse --git-dir)/info/sparse-checkout

  echo /README.md > $S
  for i in "${CHECKOUT[@]}"
  do
    echo $i >> $S
  done
fi

# Now Checkout the Submodule
git checkout
git gc --prune=all
cd ..
cd "$(git rev-parse --git-dir)"