$ git clone -n https://src.fedoraproject.org/rpms/smesh.git /var/lib/mock/f40-build-2289190-55842/root/chroot_tmpdir/scmroot/smesh
Cloning into '/var/lib/mock/f40-build-2289190-55842/root/chroot_tmpdir/scmroot/smesh'...
$ git fetch origin aaa9b3cc560a88811f7655dd132306db6cdd86ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/smesh
 * [new ref]         aaa9b3cc560a88811f7655dd132306db6cdd86ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aaa9b3c Rebuilt for Boost 1.83