release script

VERSION

@@ -0,0 +1 @@
+0.0.2

scripts/release.sh

@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT_DIR"
+
+VERSION_FILE="VERSION"
+BRANCH="main"
+
+usage() {
+  echo "Usage: $0 patch|minor|major" >&2
+  exit 1
+}
+
+BUMP="${1:-}"
+case "$BUMP" in
+  patch | minor | major) ;;
+  *) usage ;;
+esac
+
+if [[ "$(git rev-parse --abbrev-ref HEAD)" != "$BRANCH" ]]; then
+  echo "Error: releases must be cut from $BRANCH" >&2
+  exit 1
+fi
+
+if [[ -n "$(git status --porcelain)" ]]; then
+  echo "Error: working tree is not clean; commit or stash first" >&2
+  exit 1
+fi
+
+git fetch origin "$BRANCH"
+if ! git merge-base --is-ancestor "origin/$BRANCH" HEAD; then
+  echo "Error: $BRANCH is behind origin/$BRANCH; pull first" >&2
+  exit 1
+fi
+
+CURRENT="$(<"$VERSION_FILE")"
+if [[ ! "$CURRENT" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+  echo "Error: $VERSION_FILE contains '$CURRENT', expected X.Y.Z" >&2
+  exit 1
+fi
+
+IFS=. read -r MAJOR MINOR PATCH <<<"$CURRENT"
+case "$BUMP" in
+  major) NEW="$((MAJOR + 1)).0.0" ;;
+  minor) NEW="$MAJOR.$((MINOR + 1)).0" ;;
+  patch) NEW="$MAJOR.$MINOR.$((PATCH + 1))" ;;
+esac
+
+# docker-publish.yml only runs tag builds for v* refs, so the tag needs the prefix.
+TAG="v$NEW"
+if git rev-parse -q --verify "refs/tags/$TAG" >/dev/null; then
+  echo "Error: tag $TAG already exists" >&2
+  exit 1
+fi
+
+printf '%s\n' "$NEW" >"$VERSION_FILE"
+git add "$VERSION_FILE"
+git commit -m "Release $NEW"
+git tag -a "$TAG" -m "Release $NEW"
+git push origin "$BRANCH" "$TAG"
+
+echo "Released $CURRENT -> $NEW (tag $TAG)"