$ git clone -n https://src.fedoraproject.org/rpms/rust-proc-maps.git /var/lib/mock/f45-build-44041-810/root/chroot_tmpdir/scmroot/rust-proc-maps
Cloning into '/var/lib/mock/f45-build-44041-810/root/chroot_tmpdir/scmroot/rust-proc-maps'...
$ git fetch origin bf68e3afa3460f52ce0ca4a24a4ac124681e2b95:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-proc-maps
 * [new ref]         bf68e3afa3460f52ce0ca4a24a4ac124681e2b95 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf68e3a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild