don't ignore the release script, just the base release directory

Author: dennisjbell

.gitignore

@@ -1,6 +1,6 @@
 safe*
 !docs/safe*
-release
+/release
 ci/credentials.yml
 /t
 /vaults

ci/scripts/release

@@ -0,0 +1,110 @@
+#!/bin/bash
+#
+# ci/scripts/release
+#
+# Script for generating Github release / tag assets
+# and managing release notes for a Golang project
+#
+# author:  Dennis Bell <[email protected]>
+# created: 2023-06-02
+# shellcheck disable=2291
+
+set -eu
+
+header() {
+	echo
+	echo "================================================================================"
+	echo "$1"
+	echo "--------------------------------------------------------------------------------"
+	echo
+}
+
+bail() {
+	echo >&2 "$*  Did you misconfigure Concourse?"
+	exit 2
+}
+export REPO_ROOT="git"
+export BUILD_ROOT="build"
+export RELEASE_NOTES_ROOT="release-notes"
+export VERSION_FROM="version/number"
+[[ "${PRERELEASE:-0}" =~ (0|f|false|n|no) ]] && PRERELEASE=""
+
+
+test -f "${VERSION_FROM}"     || bail "Version file (${VERSION_FROM}) not found."
+VERSION=$(cat ${VERSION_FROM})
+test -n "${VERSION}"          || bail "Version file (${VERSION_FROM}) was empty."
+
+test -n "${DEVELOP_BRANCH:-}" || bail "DEVELOP_BRANCH must be set to the development Git repository branch."
+test -n "${RELEASE_BRANCH:-}" || bail "RELEASE_BRANCH must be set to the main Git repository branch."
+
+if [[ -n "${PRERELEASE}" ]] ; then
+	RELEASE_NOTES_PATH="pre-release-notes"
+	cat <<EOF > "$RELEASE_NOTES_PATH"
+<!--- Release Notes for v${VERSION} -- Do not move --->
+This is a prerelease - please see commit messages for changes
+EOF
+else 
+  test -n "${GIT_EMAIL:-}"      || bail "GIT_EMAIL must be set to an email address to use for Git commits."
+  test -n "${GIT_NAME:-}"       || bail "GIT_NAME must be set to something; it will be used for Git commits."
+  test -n "${RELEASE_ROOT:-}"   || bail "RELEASE_ROOT must be set to the output directory where release artifacts should go."
+  test -n "${RELEASE_NOTES:-}"  || bail "RELEASE_NOTES must be set to the filename of the release notes."
+  RELEASE_NOTES_PATH="${RELEASE_NOTES_ROOT}/${RELEASE_NOTES}"
+  test -f "${RELEASE_NOTES_PATH}" || \
+    bail "Release notes file (${RELEASE_NOTES_PATH}) not found."
+fi
+
+test -n "${PROJECT:-}"      || bail "PROJECT must be set to the name of this project."
+test -n "${GITHUB_OWNER:-}" || bail "GITHUB_OWNER must be set to the name of the Github user or organization that owns the Git repository."
+echo "Environment OK"
+
+###############################################################
+header "Assembling Github Release Artifacts..."
+mkdir -p "${RELEASE_ROOT}/artifacts"
+echo "v${VERSION}"           "-> ${RELEASE_ROOT}/tag"
+echo "v${VERSION}"            > "${RELEASE_ROOT}/tag"
+echo "v${VERSION}"           "-> ${RELEASE_ROOT}/name"
+echo "v${VERSION}"            > "${RELEASE_ROOT}/name"
+if [[ -n "$PRERELEASE" ]] ; then
+  echo "$(cat git/.git/ref)" "-> ${RELEASE_ROOT}/commit (pre-release)"
+  cp    git/.git/ref            "${RELEASE_ROOT}/commit"
+fi
+cp -av "${BUILD_ROOT}/${PROJECT}-${VERSION}"-* "${RELEASE_ROOT}/artifacts"
+
+header "Release Notes for v${VERSION}"
+header="$(sed -i -e '1{w /dev/stdout' -e 'd}' "${RELEASE_NOTES_PATH}")"
+re="^<\!--- Release Notes for v${VERSION} -- Do not move --->$"
+if [[ "$header" =~ $re ]] ; then
+  sed -i  '/^---8<--- This line and everything below will be ignored ---8<---$/,$d' "${RELEASE_NOTES_PATH}"
+  cat "${RELEASE_NOTES_PATH}"
+  cp "${RELEASE_NOTES_PATH}" "$RELEASE_ROOT/notes.md"
+else
+  echo "Failed to find release notes for v$VERSION in $RELEASE_NOTES_PATH.  Found this instead:"
+  echo
+  echo "$header"
+  cat "${RELEASE_NOTES_PATH}"
+  exit 1
+fi
+
+if [[ -z "${PRERELEASE}" && "$DEVELOP_BRANCH" != "$RELEASE_BRANCH" ]] ; then
+  header "Fast-forward merge develop into ${RELEASE_BRANCH}"
+  pushd git-main &>/dev/null
+    git config --global user.name  "${GIT_NAME}"
+    git config --global user.email "${GIT_EMAIL}"
+    if ! git pull ../git -X theirs --no-edit --ff-only ; then
+      # if this fails, manual intervention is required.
+      echo >&2 \
+        $'\n'"'$RELEASE_BRANCH' release branch contains commits that the '$DEVELOP_BRANCH' does not have" \
+        $'\n'"Cannot push changes to release branch..."
+      exit 1
+    fi
+  popd &>/dev/null
+fi
+
+cat > "${NOTIFICATION_OUT:-notifications}/message" <<EOS
+New ${PROJECT} v${VERSION} released. <https://github.com/${GITHUB_OWNER}/${PROJECT}/releases/tag/v${VERSION}|Release notes>.
+EOS
+
+echo
+echo "--------------------------------------------------------------------------------"
+echo "SUCCESS"
+exit 0