Fix Plasma setup on Arch library compatibility paths

.github/workflows/ci.yml

@@ -158,7 +158,7 @@ jobs:
 
       - name: Validate shell scripts
         run: |
-          bash -n data/kwin/setup.sh data/kwin/build.sh scripts/test-kwin-plugin.sh scripts/test-kwin-distro.sh scripts/test-kwin-setup.sh scripts/test-gnome-extension.sh install.sh uninstall.sh configure.sh bin/LG_Buddy_Common scripts/build-release-bundle.sh scripts/test-gui-launch.sh scripts/test-installed-gui.sh scripts/test-installer-first-run.sh scripts/test-installer-gui-dependencies.sh scripts/test-installer-graphical-auth.sh scripts/test-release-bundle.sh scripts/test-release-gui-behavior.sh scripts/test-release-gui-journey.sh scripts/test-release-linkage.sh scripts/test-cross-version-upgrade.sh scripts/test-without-python.sh scripts/test-production-upgrade-canary.sh scripts/publish-release-assets.sh
+          bash -n data/kwin/setup.sh data/kwin/build.sh scripts/test-kwin-plugin.sh scripts/test-kwin-distro.sh scripts/test-kwin-setup.sh scripts/test-kwin-native-setup.sh scripts/test-gnome-extension.sh install.sh uninstall.sh configure.sh bin/LG_Buddy_Common scripts/build-release-bundle.sh scripts/test-gui-launch.sh scripts/test-installed-gui.sh scripts/test-installer-first-run.sh scripts/test-installer-gui-dependencies.sh scripts/test-installer-graphical-auth.sh scripts/test-release-bundle.sh scripts/test-release-gui-behavior.sh scripts/test-release-gui-journey.sh scripts/test-release-linkage.sh scripts/test-cross-version-upgrade.sh scripts/test-without-python.sh scripts/test-production-upgrade-canary.sh scripts/publish-release-assets.sh
           python3 -m py_compile scripts/test-release-gui-accessibility.py scripts/test-native-setup-recovery.py scripts/xwd_mean.py tools/mock_github_gui.py
 
       - name: Validate deterministic GUI GitHub fixture
@@ -690,7 +690,7 @@ jobs:
   bundle-smoke-test:
     runs-on: ubuntu-24.04
     timeout-minutes: 2
-    needs: [bundle-build, bundle-smoke-suites, bundle-supported-distros, debian-package, rpm-package, dnf-update-fedora44, rpm-update-fedora43-refusal, release-assets]
+    needs: [bundle-build, bundle-smoke-suites, bundle-supported-distros, plasma-setup, debian-package, rpm-package, dnf-update-fedora44, rpm-update-fedora43-refusal, release-assets]
     # Keep the required check failing when production or any suite fails,
     # times out, or is skipped, even after an upstream failure.
     if: ${{ always() }}
@@ -700,17 +700,59 @@ jobs:
           BUILD_RESULT: ${{ needs.bundle-build.result }}
           SMOKE_RESULT: ${{ needs.bundle-smoke-suites.result }}
           DISTRO_RESULT: ${{ needs.bundle-supported-distros.result }}
+          PLASMA_RESULT: ${{ needs.plasma-setup.result }}
           DEBIAN_RESULT: ${{ needs.debian-package.result }}
           RPM_RESULT: ${{ needs.rpm-package.result }}
           DNF_RESULT: ${{ needs.dnf-update-fedora44.result }}
           RPM_REFUSAL_RESULT: ${{ needs.rpm-update-fedora43-refusal.result }}
           ASSETS_RESULT: ${{ needs.release-assets.result }}
         run: |
-          if [ "$BUILD_RESULT" != success ] || [ "$SMOKE_RESULT" != success ] || [ "$DISTRO_RESULT" != success ] || [ "$DEBIAN_RESULT" != success ] || [ "$RPM_RESULT" != success ] || [ "$DNF_RESULT" != success ] || [ "$RPM_REFUSAL_RESULT" != success ] || [ "$ASSETS_RESULT" != success ]; then
+          if [ "$BUILD_RESULT" != success ] || [ "$SMOKE_RESULT" != success ] || [ "$DISTRO_RESULT" != success ] || [ "$PLASMA_RESULT" != success ] || [ "$DEBIAN_RESULT" != success ] || [ "$RPM_RESULT" != success ] || [ "$DNF_RESULT" != success ] || [ "$RPM_REFUSAL_RESULT" != success ] || [ "$ASSETS_RESULT" != success ]; then
+            echo "Native Plasma setup: $PLASMA_RESULT" >&2
             echo "Bundle build: $BUILD_RESULT; smoke suites: $SMOKE_RESULT; supported distributions: $DISTRO_RESULT; Debian package: $DEBIAN_RESULT; RPM package: $RPM_RESULT; DNF update: $DNF_RESULT; Fedora 43 refusal: $RPM_REFUSAL_RESULT; release assets: $ASSETS_RESULT" >&2
             exit 1
           fi
 
+  plasma-setup:
+    needs: bundle-build
+    runs-on: ubuntu-24.04
+    timeout-minutes: 20
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: Arch current
+            image: archlinux:latest
+            setup: pacman -Syu --noconfirm --needed kwin gcc cmake make pkgconf extra-cmake-modules qt6-base qt6-declarative wayland libepoxy libdrm vulkan-headers dbus binutils sudo shadow util-linux mesa xkeyboard-config
+          - name: Fedora 44
+            image: fedora:44
+            setup: dnf install -y kwin kwin-devel gcc-c++ cmake make pkgconf-pkg-config extra-cmake-modules qt6-qtbase-devel qt6-qtdeclarative-devel wayland-devel libepoxy-devel libdrm-devel vulkan-headers dbus-daemon systemd binutils sudo shadow-utils util-linux mesa-dri-drivers xkeyboard-config
+    container:
+      image: ${{ matrix.image }}
+    steps:
+      - uses: actions/checkout@v5
+      - name: Install Plasma test prerequisites
+        run: ${{ matrix.setup }}
+      - uses: actions/download-artifact@v7
+        with:
+          name: ci-release-bundle
+          path: dist
+      - name: Exercise native setup and repair with the real distro KWin
+        shell: bash
+        run: |
+          useradd --create-home tester
+          printf 'tester ALL=(root) NOPASSWD: ALL\n' > /etc/sudoers.d/lg-buddy-test
+          chmod 440 /etc/sudoers.d/lg-buddy-test
+          archive="$(find dist -maxdepth 1 -name '*.tar.gz' -print -quit)"
+          extraction="$(mktemp -d)"
+          tar --no-same-owner -C "$extraction" -xzf "$archive"
+          bundle="$(find "$extraction" -mindepth 1 -maxdepth 1 -type d -print -quit)"
+          install -m 755 "$bundle/lg-buddy" /usr/bin/lg-buddy
+          install -d /usr/lib/lg-buddy
+          cp -a "$bundle/docs/kwin" /usr/lib/lg-buddy/kwin
+          runuser -u tester -- dbus-run-session -- env LG_BUDDY_DISPOSABLE_TEST=1 \
+            bash scripts/test-kwin-native-setup.sh /usr/bin/lg-buddy /usr/lib/lg-buddy/kwin
+
   bundle-supported-distros:
     needs: bundle-build
     runs-on: ubuntu-24.04

crates/lg-buddy/src/kwin_bridge.rs

@@ -73,6 +73,19 @@ fn plugin_directory(exists: impl Fn(&str) -> bool) -> Option<&'static str> {
     .find(|directory| exists(&format!("{directory}/kwin/plugins")))
 }
 
+/// Arch's lib64 compatibility alias must use the real supported loader root.
+/// Resolve only this exact alias; the installer still rejects other symlinks.
+pub(crate) fn resolve_plugin_root(root: &str) -> &str {
+    if root == "/usr/lib64/qt6/plugins"
+        && std::fs::read_link("/usr/lib64")
+            .is_ok_and(|target| matches!(target.to_str(), Some("lib" | "/usr/lib")))
+    {
+        "/usr/lib/qt6/plugins"
+    } else {
+        root
+    }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub(crate) struct KWinInfo {
     pub version: String,
@@ -108,7 +121,7 @@ fn inspect_with(
     }
     let version = version_field(info, "KWin version:")?.to_owned();
     let qt_version = version_field(info, "Qt Version:")?.to_owned();
-    let plugin_directory = plugin_directory(exists);
+    let plugin_directory = plugin_directory(exists).map(resolve_plugin_root);
     if get_name_owner(bus, KWIN)? != owner {
         return Err(invalid("KWin changed while inspecting integration"));
     }
@@ -275,7 +288,10 @@ mod tests {
         .unwrap();
         assert_eq!(info.version, "6.7.4");
         assert_eq!(info.qt_version, "6.10.2");
-        assert_eq!(info.plugin_directory, Some("/usr/lib64/qt6/plugins"));
+        assert_eq!(
+            info.plugin_directory,
+            Some(resolve_plugin_root("/usr/lib64/qt6/plugins"))
+        );
         assert_eq!(
             bus.calls,
             ["GetNameOwner", "supportInformation", "GetNameOwner"]

crates/lg-buddy/src/setup/kwin/native.rs

@@ -634,7 +634,11 @@ fn system_action(args: &[OsString]) -> Result<()> {
         return Err(1);
     }
     let uid: u32 = args[1].to_str().and_then(|s| s.parse().ok()).ok_or(1u8)?;
-    let root = Path::new(&args[2]);
+    // Existing receipts may retain the lib64 spelling from before discovery
+    // normalized the distribution's compatibility alias.
+    let root = Path::new(kwin_bridge::resolve_plugin_root(
+        args[2].to_str().ok_or(1u8)?,
+    ));
     let id = args[3].to_str().ok_or(1u8)?;
     if !owned_id(uid, id) || !supported_root(root) {
         return Err(1);

crates/lg-buddy/tests/cucumber_support/mod.rs

@@ -1,2 +1,3 @@
+pub mod plasma;
 pub mod steps;
 pub mod world;