$ git clone -n https://src.fedoraproject.org/rpms/rubygem-bacon.git /var/lib/mock/f40-build-2033519-47812/root/chroot_tmpdir/scmroot/rubygem-bacon
Cloning into '/var/lib/mock/f40-build-2033519-47812/root/chroot_tmpdir/scmroot/rubygem-bacon'...
$ git fetch origin ce042463adc72f0bd06f0ba87fc60b42d6a44006:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-bacon
 * [new ref]         ce042463adc72f0bd06f0ba87fc60b42d6a44006 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce04246 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild