$ git clone -n https://src.fedoraproject.org/rpms/rust-testing_table.git /var/lib/mock/f45-build-45395-822/root/chroot_tmpdir/scmroot/rust-testing_table
Cloning into '/var/lib/mock/f45-build-45395-822/root/chroot_tmpdir/scmroot/rust-testing_table'...
$ git fetch origin 75e73a6ceef812c7ab5ccc9bbad410c81a5736c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-testing_table
 * [new ref]         75e73a6ceef812c7ab5ccc9bbad410c81a5736c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75e73a6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild