#!/usr/bin/env bash
# SPDX-License-Identifier: Apache-2.0
#
# Copyright (C) 2023 The Falco Authors.
#
# 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

# Output LDFlAGS for a given environment. LDFLAGS are applied to all go binary
# builds.
#
# Args: env
function ldflags() {
  local GIT_VERSION=$(git describe --tags --always --dirty)
  local GIT_COMMIT=$(git rev-parse HEAD)

  local GIT_TREESTATE="clean"
  if [[ $(git diff --stat) != '' ]]; then
    GIT_TREESTATE="dirty"
  fi

  local DATE_FMT="+%Y-%m-%dT%H:%M:%SZ"
  local BUILD_DATE=$(date "$DATE_FMT")
  local SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct)
  if [ $SOURCE_DATE_EPOCH ]
  then
      local BUILD_DATE=$(date -u -d "@$SOURCE_DATE_EPOCH" "$DATE_FMT" 2>/dev/null || date -u -r "$SOURCE_DATE_EPOCH" "$DATE_FMT" 2>/dev/null || date -u "$DATE_FMT")
  fi

  echo "-buildid= -X main.GitVersion=${GIT_VERSION} \
        -X main.gitCommit=${GIT_COMMIT} \
        -X main.gitTreeState=${GIT_TREESTATE} \
        -X main.buildDate=${BUILD_DATE}"
}