$ git clone -n https://src.fedoraproject.org/rpms/rubygem-bundler.git /var/lib/mock/f45-build-34809-691/root/chroot_tmpdir/scmroot/rubygem-bundler
Cloning into '/var/lib/mock/f45-build-34809-691/root/chroot_tmpdir/scmroot/rubygem-bundler'...
$ git fetch origin 58660b55c498a4946fa29f8259f7fd5f4d8a6b91:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-bundler
 * [new ref]         58660b55c498a4946fa29f8259f7fd5f4d8a6b91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 58660b5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild