$ git clone -n https://src.fedoraproject.org/rpms/rust-x11-dl.git /var/lib/mock/f45-build-46261-832/root/chroot_tmpdir/scmroot/rust-x11-dl
Cloning into '/var/lib/mock/f45-build-46261-832/root/chroot_tmpdir/scmroot/rust-x11-dl'...
$ git fetch origin b7db6e9ab46c99239b59c41c548d0c779be2df7d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-x11-dl
 * [new ref]         b7db6e9ab46c99239b59c41c548d0c779be2df7d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7db6e9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild