$ git clone -n https://src.fedoraproject.org/rpms/rcm.git /var/lib/mock/f39-build-1456459-32922/root/chroot_tmpdir/scmroot/rcm
Cloning into '/var/lib/mock/f39-build-1456459-32922/root/chroot_tmpdir/scmroot/rcm'...
$ git fetch origin 55206500a7a4a37cf96bc9923c03bd70bbfd73b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rcm
 * [new ref]         55206500a7a4a37cf96bc9923c03bd70bbfd73b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5520650 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild