$ git clone -n https://src.fedoraproject.org/rpms/gtk2-engines.git /var/lib/mock/f40-build-792491-138440/root/chroot_tmpdir/scmroot/gtk2-engines
Cloning into '/var/lib/mock/f40-build-792491-138440/root/chroot_tmpdir/scmroot/gtk2-engines'...
$ git fetch origin 519c73a98936097c99aa60982eec8a1aefd25eb2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtk2-engines
 * [new ref]         519c73a98936097c99aa60982eec8a1aefd25eb2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 519c73a Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild