$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rails-controller-testing.git /var/lib/mock/f40-build-2305503-57090/root/chroot_tmpdir/scmroot/rubygem-rails-controller-testing
Cloning into '/var/lib/mock/f40-build-2305503-57090/root/chroot_tmpdir/scmroot/rubygem-rails-controller-testing'...
$ git fetch origin b988d746c3d0428bdc3c179781f4847df4c1d843:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rails-controller-testing
 * [new ref]         b988d746c3d0428bdc3c179781f4847df4c1d843 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b988d74 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild