Fix librest

The conditioning stage wasn't dependent on librest, so it could
be done before, thus not "fixing" the .pc files of librest.

Also, this PR adds a tool to check dependencies, a tool to check
them, and an automated test for github.

.github/workflows/check-dependencies.yml

@@ -0,0 +1,22 @@
+name: test-dependencies
+on:
+  pull_request:
+  push:
+    branches:
+      - gnome-46-2404-sdk
+
+jobs:
+  check-deps:
+    runs-on: ubuntu-latest
+    container:
+      image: ubuntu:rolling
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install dependencies (Ubuntu)
+        run: |
+          apt-get update
+          DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends python3 python3-yaml
+      - name: Verify dependencies
+        run: |
+          tools/check_dependencies.py

snapcraft.yaml

@@ -1335,7 +1335,7 @@ parts:
       done
 
   debs:
-    after: [ libgnome-games-support, libadwaita, libgweather, libayatana-appindicator, libsoup3 ]
+    after: [ libgnome-games-support, libadwaita, libgweather, libayatana-appindicator, libsoup3, librest, buildenv, at-spi2-core, webp-pixbuf-loader ]
     plugin: nil
     stage-packages:
       - appstream

tools/check_dependencies.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+
+import os
+import sys
+import yaml
+
+# Ensure that "deb" part depends on all previous parts
+
+config_file = "snapcraft.yaml"
+if not os.path.exists(config_file):
+    config_file = os.path.join("snap", "snapcraft.yaml")
+
+data = yaml.safe_load(open(config_file, "r"))
+
+parts = {}
+
+for part in data['parts']:
+    if part == "debs":
+        break
+    parts[part] = False
+
+def filldeps(part):
+    global data
+    global parts
+    if 'after' not in data['parts'][part]:
+        return
+
+    deps = data['parts'][part]['after']
+    for dep in deps:
+        parts[dep] = True
+        filldeps(dep)
+
+filldeps("debs")
+failed = False
+for part in parts:
+    if parts[part]:
+        continue
+    print(f"DEBS must depend on {part}")
+    failed = True
+
+if failed:
+    sys.exit(1)
+print("All dependencies are correct")