$ git clone -n https://src.fedoraproject.org/rpms/rubygem-test_declarative.git /var/lib/mock/f45-build-35387-695/root/chroot_tmpdir/scmroot/rubygem-test_declarative
Cloning into '/var/lib/mock/f45-build-35387-695/root/chroot_tmpdir/scmroot/rubygem-test_declarative'...
$ git fetch origin b25e7429da7f6efffcd1fe85d22440c1992e20bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-test_declarative
 * [new ref]         b25e7429da7f6efffcd1fe85d22440c1992e20bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b25e742 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild