#!/bin/sh
#
# This hook does two things:
#
#  1. update the "info" files that allow the list of references to be
#     queries over dumb transports such as http
#
#  2. if this repository looks like it is a non-bare repository, and
#     the checked-out branch is pushed to, then update the working copy.
#     This makes "push" function somewhat similarly to darcs and bzr.
#
# To enable this hook, make this file executable by "chmod +x post-update".

umask 002

git-update-server-info

is_bare=$(git-config --get --bool core.bare)

if [ -z "$is_bare" ]
then
  # for compatibility's sake, guess
  git_dir_full=$(cd $GIT_DIR; pwd)
  case $git_dir_full in */.git) is_bare=false;; *) is_bare=true;; esac
fi

update_wc() {
  ref=$1
  echo "Push to checked out branch $ref" >&2
  if [ ! -f $GIT_DIR/logs/HEAD ]
  then
    echo "E:push to non-bare repository requires a HEAD reflog" >&2
    exit 1
  fi
  if (cd $GIT_WORK_TREE; git-diff-files -q --exit-code >/dev/null)
  then
    wc_dirty=0
  else
    echo "W:unstaged changes found in working copy" >&2
    wc_dirty=1
    desc="working copy"
  fi
  if git diff-index --cached HEAD@{1} >/dev/null
  then
    index_dirty=0
  else
    echo "W:uncommitted, staged changes found" >&2
    index_dirty=1
    if [ -n "$desc" ]
    then
      desc="$desc and index"
    else
      desc="index"
    fi
  fi
  if [ "$wc_dirty" -ne 0 -o "$index_dirty" -ne 0 ]
  then
    new=$(git rev-parse HEAD)
    echo "W:stashing dirty $desc - see git-stash(1)" >&2
    ( trap 'echo trapped $$; git symbolic-ref HEAD "'"$ref"'"' 2 3 13 15 ERR EXIT
    git-update-ref --no-deref HEAD HEAD@{1}
    cd $GIT_WORK_TREE
    git stash save "dirty $desc before update to $new";
    git-symbolic-ref HEAD "$ref"
    )
  fi

  # eye candy - show the WC updates :)
  echo "Updating working copy" >&2
  (cd $GIT_WORK_TREE
  git-diff-index -R --name-status HEAD >&2
  git-reset --hard HEAD)
}

if [ "$is_bare" = "false" ]
then
  active_branch=`git-symbolic-ref HEAD`
  export GIT_DIR=$(cd $GIT_DIR; pwd)
  GIT_WORK_TREE=${GIT_WORK_TREE-..}
  for ref
  do
    if [ "$ref" = "$active_branch" ]
    then
      update_wc $ref
    fi
  done
fi