$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rspec-expectations.git /var/lib/mock/f45-build-35264-694/root/chroot_tmpdir/scmroot/rubygem-rspec-expectations
Cloning into '/var/lib/mock/f45-build-35264-694/root/chroot_tmpdir/scmroot/rubygem-rspec-expectations'...
$ git fetch origin aaac301dbc109a9f017fb2e0b3fe8c65a49bb29d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rspec-expectations
 * [new ref]         aaac301dbc109a9f017fb2e0b3fe8c65a49bb29d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aaac301 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild