$ git clone -n https://src.fedoraproject.org/rpms/rust-uucore_procs.git /var/lib/mock/f45-build-46018-830/root/chroot_tmpdir/scmroot/rust-uucore_procs
Cloning into '/var/lib/mock/f45-build-46018-830/root/chroot_tmpdir/scmroot/rust-uucore_procs'...
$ git fetch origin f0fa91b82475bdd46671d89c44c7a9216bba0a36:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uucore_procs
 * [new ref]         f0fa91b82475bdd46671d89c44c7a9216bba0a36 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f0fa91b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild