$ git clone -n https://src.fedoraproject.org/rpms/rust-field-offset.git /var/lib/mock/f40-build-2092133-50265/root/chroot_tmpdir/scmroot/rust-field-offset
Cloning into '/var/lib/mock/f40-build-2092133-50265/root/chroot_tmpdir/scmroot/rust-field-offset'...
$ git fetch origin 6c589a03823d8835429749b8b5a9eb4036e0656c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-field-offset
 * [new ref]         6c589a03823d8835429749b8b5a9eb4036e0656c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c589a0 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild