$ git clone -n https://src.fedoraproject.org/rpms/rust-x11rb.git /var/lib/mock/f45-build-46216-832/root/chroot_tmpdir/scmroot/rust-x11rb
Cloning into '/var/lib/mock/f45-build-46216-832/root/chroot_tmpdir/scmroot/rust-x11rb'...
$ git fetch origin f3fcddbbbd0d9fd920838daaf5fdd5d6808a4216:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-x11rb
 * [new ref]         f3fcddbbbd0d9fd920838daaf5fdd5d6808a4216 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f3fcddb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild