meson: Make libportal a meson subproject

This has a few advantages:
* the version required for the tests will automatically reach developers
* CI and local builds use the same version

Long term we should move our tests to the python harness and drop
libportal as a dependency.

.github/workflows/build-and-test.yml

@@ -47,36 +47,15 @@ jobs:
       - name: Check POTFILES.in
         run: .github/workflows/check-potfiles.sh
 
-      - name: Check out libportal fork with a similarly named branch
-        id: libportal-branched
-        uses: actions/checkout@v4
-        continue-on-error: true
-        with:
-          repository: ${{ github.actor }}/libportal
-          ref: ${{ github.head_ref || github.ref_name }}
-          path: libportal
-
-      - name: Check out libportal default branch
-        if: steps.libportal-branched.outcome == 'failure'
-        uses: actions/checkout@v4
-        with:
-          repository: flatpak/libportal
-          path: libportal
-
-      - name: Build libportal
-        run: |
-          meson setup libportal _build_libportal $MESON_OPTIONS
-          meson compile -C _build_libportal
-          meson install -C _build_libportal
-        env:
-          MESON_OPTIONS: --prefix=/usr -Ddocs=false -Dintrospection=false -Dtests=false
-
       - name: Build xdg-desktop-portal
         run: |
-          meson setup _build $MESON_OPTIONS
+          meson setup _build \
+            -Dinstalled-tests=true \
+            -Dpytest=enabled \
+            -Db_sanitize=${{ matrix.sanitizer }} \
+            -Db_lundef=false \
+            -Dforce_fallback_for=libportal
           meson compile -C _build
-        env:
-          MESON_OPTIONS: -Dinstalled-tests=true -Dpytest=enabled -Db_sanitize=${{ matrix.sanitizer }}
 
       - name: Run xdg-desktop-portal tests
         run: timeout --signal=KILL -v ${TESTS_TIMEOUT}m meson test -C _build

.gitignore

@@ -1 +1,2 @@
 __pycache__
+subprojects/libportal/

meson.build

@@ -4,7 +4,10 @@ project(
   version: '1.19.1',
   meson_version: '>= 0.60',
   license: 'LGPL-2.0-or-later',
-  default_options: ['warning_level=2'])
+  default_options: [
+    'warning_level=2',
+  ],
+)
 
 ###### various directories we'll use later
 # foodir are built-in ones, foo_dir are our options
@@ -110,11 +113,23 @@ json_glib_dep = dependency('json-glib-1.0')
 fuse3_dep = dependency('fuse3', version: '>= 3.10.0')
 gdk_pixbuf_dep = dependency('gdk-pixbuf-2.0')
 gst_pbutils_dep = dependency('gstreamer-pbutils-1.0')
-geoclue_dep = dependency('libgeoclue-2.0',
-                         version: '>= 2.5.2',
-                         required: get_option('geoclue'))
-libportal_dep = dependency('libportal',
-                           required: get_option('libportal'))
+geoclue_dep = dependency(
+  'libgeoclue-2.0',
+  version: '>= 2.5.2',
+  required: get_option('geoclue'),
+)
+libportal_dep = dependency(
+  'libportal',
+  version: '>= 0.8.1',
+  required: get_option('libportal'),
+  fallback: ['libportal', 'libportal_dep'],
+  default_options: [
+    'introspection=false',
+    'vapi=false',
+    'docs=false',
+    'tests=false',
+  ],
+)
 pipewire_dep = dependency('libpipewire-0.3', version: '>= 0.2.90')
 libsystemd_dep = dependency('libsystemd', required: get_option('systemd'))
 

subprojects/libportal.wrap

@@ -0,0 +1,4 @@
+[wrap-git]
+directory=libportal
+url=https://github.com/flatpak/libportal.git
+revision=main