mkosi: update fedora commit reference to 6646d13acae64665f63354cd60ecf963ee563b96 (#37065)

* 6646d13aca fmf: Run tests from systemd-tests rpm if possible

.packit.yml

@@ -39,7 +39,7 @@ jobs:
   trigger: pull_request
   fmf_url: https://src.fedoraproject.org/rpms/systemd
   # This is automatically updated by tools/fetch-distro.py --update fedora
-  fmf_ref: 08ce156d74460867657fb9b201c8be93d31e07de
+  fmf_ref: 6646d13acae64665f63354cd60ecf963ee563b96
   targets:
   - fedora-rawhide-x86_64
   # testing-farm in the Fedora repository is explicitly configured to use testing-farm bare metal runners as

mkosi/mkosi.conf.d/centos-fedora/mkosi.conf.d/pkgenv.conf

@@ -8,5 +8,5 @@ Distribution=|fedora
 Environment=
         GIT_URL=https://src.fedoraproject.org/rpms/systemd.git
         GIT_BRANCH=rawhide
-        GIT_COMMIT=08ce156d74460867657fb9b201c8be93d31e07de
+        GIT_COMMIT=6646d13acae64665f63354cd60ecf963ee563b96
         PKG_SUBDIR=fedora

test/meson.build

@@ -291,12 +291,23 @@ if install_tests
         endif
 
         if meson.version().version_compare('>=1.3.0')
+                # Installing symlinks to directories is broken in install_subdir() so we exclude the
+                # standalone directory from install_subdir() and handle it manually.
+                # TODO: Remove when https://github.com/mesonbuild/meson/pull/14471 is available in all
+                # supported distributions.
                 install_subdir('integration-tests',
                                install_dir : testsdir,
+                               exclude_directories : ['standalone'],
                                follow_symlinks : false)
+                install_emptydir(testsdir / 'integration-tests/standalone')
+                install_data('integration-tests/standalone/meson.build',
+                             install_dir : testsdir / 'integration-tests/standalone')
+                install_symlink('integration-tests',
+                                pointing_to : '..',
+                                install_dir : testsdir / 'integration-tests/standalone')
         else
                 meson.add_install_script(sh, '-c',
-                                         rsync_r.format(meson.current_source_dir() / 'integration-tests', testdata_dir))
+                                         rsync_r.format(meson.current_source_dir() / 'integration-tests', testsdir))
         endif
 
         foreach integration_test : integration_tests