$ git clone -n https://src.fedoraproject.org/rpms/rubygem-marcel.git /var/lib/mock/f45-build-35060-693/root/chroot_tmpdir/scmroot/rubygem-marcel
Cloning into '/var/lib/mock/f45-build-35060-693/root/chroot_tmpdir/scmroot/rubygem-marcel'...
$ git fetch origin e48ad9d0bbe7a3c1d77f6aaa7a78641ac3d73eb7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-marcel
 * [new ref]         e48ad9d0bbe7a3c1d77f6aaa7a78641ac3d73eb7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e48ad9d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild