prepare-release.sh

#!/usr/bin/env bash
set -e

if [ -n "$GITHUB_WORKSPACE" ]; then
  git config --global --add safe.directory $GITHUB_WORKSPACE
  cd "$GITHUB_WORKSPACE" || exit
fi

GITHUB_URL="https://api.github.com/repos/$GITHUB_REPOSITORY"
VERSION_TAG=$(TZ="Europe/Oslo" date +'%Y%m%d%H%M')
echo "VERSION_TAG=$VERSION_TAG" >> "$GITHUB_ENV"

if [[ ! `git describe --abbrev=0 --tags` ]]; then
  FIRST_COMMIT=$(git rev-list --max-parents=0 HEAD)
  git tag "CD_autocreate_tag" $FIRST_COMMIT
  echo "No tags found. Created one on the initial commit"
fi

LATEST_TAG=$(git describe --abbrev=0 --tags)

git remote set-url origin "https://${GITHUB_ACTOR}:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git"
git tag -f $VERSION_TAG
git push -f --tags

LATEST_RELEASE=$(curl -s -H "Authorization: token $GITHUB_TOKEN" "https://api.github.com/repos/$GITHUB_REPOSITORY/releases/latest" | jq -r '.tag_name')
if [ "$LATEST_RELEASE" = "null" ]; then LATEST_RELEASE=$LATEST_TAG; fi
echo "Found latest release: $LATEST_RELEASE"
GIT_TREE="[$VERSION_TAG](https://github.com/$GITHUB_REPOSITORY/tree/$VERSION_TAG)"
COMPARE_LINK="[Full Changelog](https://github.com/$GITHUB_REPOSITORY/compare/$LATEST_RELEASE...$VERSION_TAG)"
GIT_LOG=$(git log $LATEST_RELEASE..$VERSION_TAG --no-merges --pretty=format:"* %ad %s" -50 --date=short | sed "/^\\s*$/d")
CHANGELOG="$GIT_TREE
$COMPARE_LINK
$GIT_LOG"
echo "CHANGE_LOG<<EOF" >> "$GITHUB_ENV"
echo "$CHANGELOG" >> "$GITHUB_ENV"
echo "EOF" >> "$GITHUB_ENV"