$ git clone -n https://src.fedoraproject.org/rpms/rubygem-minitest-mock.git /var/lib/mock/f45-build-35054-693/root/chroot_tmpdir/scmroot/rubygem-minitest-mock
Cloning into '/var/lib/mock/f45-build-35054-693/root/chroot_tmpdir/scmroot/rubygem-minitest-mock'...
$ git fetch origin e4a026aef4517d3c9a1b33cf6f291e49db20f0c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-minitest-mock
 * [new ref]         e4a026aef4517d3c9a1b33cf6f291e49db20f0c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4a026a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild