branch-specific ignore hook

post-checkout

#!/bin/sh

# Compatible with git worktrees
# Assumes that root of "main" worktree has .gitignore files with the following format:
## .gitignore.$branchName
#
# Will stip out branch prefixes (e.g., bug/DEV-123 becomes DEV-123)
# If no branch-ignore is found, nothing happens

old_ref=$1
new_ref=$2
branch_switched=$3

if [[ $branch_switched != '1' ]]
then
    exit 0
fi
echo "---- POST CHECKOUT ----"
current_branch=$(git rev-parse --abbrev-ref HEAD | cut -d '/' -f 2)
hook_dir=$(dirname $0)
git_dir="$(git rev-parse --git-dir)"
root_dir="$(git rev-parse --git-common-dir)/.."
info_dir="$git_dir/info"

exclude_target='.gitignore'
echo "Checking for branch-specific gitignore $root_dir/$exclude_target.$current_branch"
if [[ -f "$root_dir/$exclude_target.$current_branch" ]]
then
  echo "Found a branch-specific gitignore!"
  echo "Prepare to use .gitignore.$current_branch as exclude file"
  exclude_target=.gitignore.$current_branch
  if [ ! -d "$info_dir" ];
  then
    echo "Making info directory: $info_dir"
    mkdir "$info_dir"
  fi
  cd "$info_dir"
  rm exclude
  echo "Copy .gitignore.$current_branch file in place of exclude"
  cp "$root_dir/$exclude_target" exclude
fi
echo "--- POST CHECKOUT END ---"