$ git clone -n https://src.fedoraproject.org/rpms/sing.git /var/lib/mock/f40-build-2041829-48472/root/chroot_tmpdir/scmroot/sing
Cloning into '/var/lib/mock/f40-build-2041829-48472/root/chroot_tmpdir/scmroot/sing'...
$ git fetch origin b0b2f8c752f1a05e50e407f88c888bd47713037b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sing
 * [new ref]         b0b2f8c752f1a05e50e407f88c888bd47713037b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0b2f8c Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild