$ git clone -n https://src.fedoraproject.org/rpms/rubygem-ruby_dep.git /var/lib/mock/f45-build-35279-694/root/chroot_tmpdir/scmroot/rubygem-ruby_dep
Cloning into '/var/lib/mock/f45-build-35279-694/root/chroot_tmpdir/scmroot/rubygem-ruby_dep'...
$ git fetch origin 39dc818f6d8e9e3d4704e120b21e848cbec27c5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-ruby_dep
 * [new ref]         39dc818f6d8e9e3d4704e120b21e848cbec27c5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39dc818 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild