$ git clone -n https://src.fedoraproject.org/rpms/perl-Acme-Damn.git /var/lib/mock/f40-build-2619141-64582/root/chroot_tmpdir/scmroot/perl-Acme-Damn
Cloning into '/var/lib/mock/f40-build-2619141-64582/root/chroot_tmpdir/scmroot/perl-Acme-Damn'...
$ git fetch origin b454a738d39f1469c141e1eae3d9acc51d916bb0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Acme-Damn
 * [new ref]         b454a738d39f1469c141e1eae3d9acc51d916bb0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b454a73 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild