$ git clone -n https://src.fedoraproject.org/rpms/rust-rustix0.38.git /var/lib/mock/f45-build-44557-815/root/chroot_tmpdir/scmroot/rust-rustix0.38
Cloning into '/var/lib/mock/f45-build-44557-815/root/chroot_tmpdir/scmroot/rust-rustix0.38'...
$ git fetch origin 3a140f747dbefae46a8d198c6a526c8713532595:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustix0.38
 * [new ref]         3a140f747dbefae46a8d198c6a526c8713532595 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3a140f7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild