$ git clone -n https://src.fedoraproject.org/rpms/rust-run_script.git /var/lib/mock/f45-build-44511-814/root/chroot_tmpdir/scmroot/rust-run_script
Cloning into '/var/lib/mock/f45-build-44511-814/root/chroot_tmpdir/scmroot/rust-run_script'...
$ git fetch origin 2dc42071a5ff66468d2879f40e58ac5c40d0c7b6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-run_script
 * [new ref]         2dc42071a5ff66468d2879f40e58ac5c40d0c7b6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2dc4207 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild