$ git clone -n https://src.fedoraproject.org/rpms/rubygem-activemodel.git /var/lib/mock/f40-build-2305356-57081/root/chroot_tmpdir/scmroot/rubygem-activemodel
Cloning into '/var/lib/mock/f40-build-2305356-57081/root/chroot_tmpdir/scmroot/rubygem-activemodel'...
$ git fetch origin a197d8b9ce26c32199280e08f6041c1b435888fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-activemodel
 * [new ref]         a197d8b9ce26c32199280e08f6041c1b435888fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a197d8b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild