#!/bin/bash

# Copyright 2014 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -o errexit
set -o nounset
set -o pipefail

topdir=$(dirname "$0")/..
cd "${topdir}"

# TODO: when we start making tags, switch to git describe?
if git_commit=$(git rev-parse --short "HEAD^{commit}" 2>/dev/null); then
  # Remove any invalid characters that might confuse "sed".
  git_commit=${git_commit//[^a-f0-9]/}

  # Check if the tree is dirty.
  if ! dirty_tree=$(git status --porcelain) || [[ -n "${dirty_tree}" ]]; then
    git_commit="${git_commit}-dirty"
  fi
else
  git_commit="(none)"
  echo "WARNING: unable to find git commit, falling back to commitFromGit = \`${git_commit}\`" >&2
fi

# TODO: Instead of using an autogenerated file, we could pass this variable
# to the source through Go's -X ldflag.
sed "s/@@GIT_COMMIT@@/${git_commit}/g" \
  pkg/version/template.go.tmpl >pkg/version/autogenerated.go