$ git clone -n https://src.fedoraproject.org/rpms/gtk4.git /var/lib/mock/f40-build-2246462-53816/root/chroot_tmpdir/scmroot/gtk4
Cloning into '/var/lib/mock/f40-build-2246462-53816/root/chroot_tmpdir/scmroot/gtk4'...
$ git fetch origin 5e5f2a27d91c6952e0527654bf2710c9d6436fbe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtk4
 * [new ref]         5e5f2a27d91c6952e0527654bf2710c9d6436fbe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5e5f2a2 Add explicit vulkan build dep