A simple bash script to run git pull in a directory of repos

git-sync.sh

#!/usr/bin/env bash

# A simple bash script to run git pull in a directory of repos. Automatically
# detects whether each directory is a git repository, and can optionally
# checkout a branch before pulling using the `-b <branch-name>` argument.

# Save original working directory
_ORIGINAL_PWD="$PWD"

# Parse args
while getopts ":b:" opt; do
  case $opt in
    b) SYNC_BRANCH=$OPTARG;;
    \?) echo "Invalid option: -$OPTARG" >&2;;
  esac
done

# Find all git repos in the current directory or pull the current directory
REPOS_DIR="$PWD"
if [ -d "$REPOS_DIR/.git" ]; then
  REPOS="$REPOS_DIR"
else
  REPOS="`find $REPOS_DIR -name .git -maxdepth 2 -type d`"
fi

# CD into each directory, optionally checkout a branch, and pull
for REPO in $REPOS; do
  echo "Syncing $REPO..."
  cd $REPO && cd ..
  [ $SYNC_BRANCH ] && git checkout $SYNC_BRANCH
  git pull
done

# Go back to the original directory
cd $_ORIGINAL_PWD