$ git clone -n https://src.fedoraproject.org/rpms/R-winch.git /var/lib/mock/f40-build-789255-135690/root/chroot_tmpdir/scmroot/R-winch
Cloning into '/var/lib/mock/f40-build-789255-135690/root/chroot_tmpdir/scmroot/R-winch'...
$ git fetch origin 9f8879c998033d222bd3a09f02f041b98eecc58c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-winch
 * [new ref]         9f8879c998033d222bd3a09f02f041b98eecc58c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f8879c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild