$ git clone -n https://src.fedoraproject.org/rpms/rust-relative-path.git /var/lib/mock/f45-build-44383-813/root/chroot_tmpdir/scmroot/rust-relative-path
Cloning into '/var/lib/mock/f45-build-44383-813/root/chroot_tmpdir/scmroot/rust-relative-path'...
$ git fetch origin 743c47abcbd70c4f4c3155047fdf25d8fbe6fe47:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-relative-path
 * [new ref]         743c47abcbd70c4f4c3155047fdf25d8fbe6fe47 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 743c47a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild