$ git clone -n https://src.fedoraproject.org/rpms/cockpit-machines.git /var/lib/mock/f40-build-2721329-73078/root/chroot_tmpdir/scmroot/cockpit-machines
Cloning into '/var/lib/mock/f40-build-2721329-73078/root/chroot_tmpdir/scmroot/cockpit-machines'...
$ git fetch origin 037c630d1f21f5284ec87cade3e724d8bb576dd0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cockpit-machines
 * [new ref]         037c630d1f21f5284ec87cade3e724d8bb576dd0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 037c630 Update to 311 upstream release