$ git clone -n https://src.fedoraproject.org/rpms/rust-openat.git /var/lib/mock/f45-build-43541-803/root/chroot_tmpdir/scmroot/rust-openat
Cloning into '/var/lib/mock/f45-build-43541-803/root/chroot_tmpdir/scmroot/rust-openat'...
$ git fetch origin d1bae56fc3b206cb3ef6d654978f4c7c0ac61ee4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-openat
 * [new ref]         d1bae56fc3b206cb3ef6d654978f4c7c0ac61ee4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1bae56 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild