$ git clone -n https://src.fedoraproject.org/rpms/rust-serial_test_derive.git /var/lib/mock/f45-build-44876-818/root/chroot_tmpdir/scmroot/rust-serial_test_derive
Cloning into '/var/lib/mock/f45-build-44876-818/root/chroot_tmpdir/scmroot/rust-serial_test_derive'...
$ git fetch origin 873e250a982dddf7eaf263167ac2d5ccce6a5ec5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serial_test_derive
 * [new ref]         873e250a982dddf7eaf263167ac2d5ccce6a5ec5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 873e250 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild