feat: add build script for plugin metapackages and integrate into CI pipeline

.github/workflows/plugins.yml

@@ -88,6 +88,10 @@ jobs:
             packaging/build-plugin-package.sh deb "$manifest" target/x86_64-unknown-linux-gnu/release dist
             packaging/build-plugin-package.sh rpm "$manifest" target/x86_64-unknown-linux-gnu/release dist
           done < <(jq -c '.["include"][]' .plugin-release-plan.json)
+          metapackage_version=$(jq -er '[.include[].engine_version] | unique | if length == 1 then .[0] else error("plugins target different engine versions") end' .plugin-release-plan.json)
+          metapackage_release=${GITHUB_RUN_NUMBER:?GITHUB_RUN_NUMBER is required}
+          packaging/build-plugin-metapackages.sh deb "$metapackage_version" "$metapackage_release" dist
+          packaging/build-plugin-metapackages.sh rpm "$metapackage_version" "$metapackage_release" dist
       - name: Import GPG key
         if: steps.plugins.outputs.count != '0'
         id: import-gpg

packaging/build-plugin-metapackages.sh

@@ -0,0 +1,74 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+packager=${1:?packager must be deb or rpm}
+version=${2:?metapackage version is required}
+release=${3:?metapackage release is required}
+dist_dir=${4:-dist}
+nfpm_command=${NFPM:-nfpm}
+
+if [[ "$packager" != "deb" && "$packager" != "rpm" ]]; then
+    echo "packager must be deb or rpm" >&2
+    exit 1
+fi
+if [[ ! "$release" =~ ^[1-9][0-9]*$ ]]; then
+    echo "metapackage release must be a positive integer" >&2
+    exit 1
+fi
+
+if [[ "$packager" == "deb" ]]; then
+    architecture=all
+else
+    architecture=noarch
+fi
+
+mkdir -p "$dist_dir"
+
+make_metapackage() {
+    local name=$1 description=$2
+    shift 2
+    local config
+    config=$(mktemp)
+    {
+        echo "name: $name"
+        echo "arch: $architecture"
+        echo "platform: linux"
+        echo "version: $version"
+        echo "release: $release"
+        echo "section: utils"
+        echo "priority: optional"
+        echo "maintainer: Elias Wendland <eliaswendland@pm.me>"
+        echo "description: $description"
+        echo "license: GPL-3.0-only"
+        echo "homepage: https://git.ewenlau.net/ewenlau/convertis"
+        echo "depends:"
+        for dependency in "$@"; do
+            echo "  - $dependency"
+        done
+    } > "$config"
+    "$nfpm_command" package --config "$config" --packager "$packager" --target "$dist_dir/"
+    rm -f "$config"
+}
+
+# These dependencies deliberately have no version constraint. Each plugin has
+# its own release cycle, so a metapackage must never pin an installed plugin to
+# the version that happened to exist when the metapackage was built.
+make_metapackage convertis-ffmpeg "All official FFmpeg plugins for Convertis" \
+    convertis \
+    convertis-ffmpeg-audio \
+    convertis-ffmpeg-video \
+    convertis-ffmpeg-video-to-frames \
+    convertis-ffmpeg-frames-to-video
+
+make_metapackage convertis-image "All official image plugins for Convertis" \
+    convertis \
+    convertis-native-image \
+    convertis-image-ascii \
+    convertis-imagemagick \
+    convertis-graphicsmagick
+
+make_metapackage convertis-plugins-all "Every official Convertis plugin" \
+    convertis \
+    convertis-ffmpeg \
+    convertis-image \
+    convertis-html