$ git clone -n https://src.fedoraproject.org/rpms/cairomm1.16.git /var/lib/mock/f40-build-2283346-55587/root/chroot_tmpdir/scmroot/cairomm1.16
Cloning into '/var/lib/mock/f40-build-2283346-55587/root/chroot_tmpdir/scmroot/cairomm1.16'...
$ git fetch origin 3124c9b856d89ad6097ae6f7a587abb4dc77be20:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cairomm1.16
 * [new ref]         3124c9b856d89ad6097ae6f7a587abb4dc77be20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3124c9b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild