$ git clone -n https://src.fedoraproject.org/rpms/R-forcats.git /var/lib/mock/f40-build-1944416-25177/root/chroot_tmpdir/scmroot/R-forcats
Cloning into '/var/lib/mock/f40-build-1944416-25177/root/chroot_tmpdir/scmroot/R-forcats'...
$ git fetch origin 3467442fe3aaa63db29b1999a97c80f130475f6b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-forcats
 * [new ref]         3467442fe3aaa63db29b1999a97c80f130475f6b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3467442 R-maint-sig mass rebuild