$ git clone -n https://src.fedoraproject.org/rpms/emacs.git /var/lib/mock/f43-build-side-110832-59113421-6571187/root/chroot_tmpdir/scmroot/emacs
Cloning into '/var/lib/mock/f43-build-side-110832-59113421-6571187/root/chroot_tmpdir/scmroot/emacs'...
$ git fetch origin 2a41db911d3f42822fa45c8c5dea2b1447378bae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs
 * [new ref]         2a41db911d3f42822fa45c8c5dea2b1447378bae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2a41db9 Emacs 31 compatibility for Tree-sitter Recommends generation.