$ git clone -n https://src.fedoraproject.org/rpms/cockpit-machines.git /var/lib/mock/f40-build-2432400-60659/root/chroot_tmpdir/scmroot/cockpit-machines
Cloning into '/var/lib/mock/f40-build-2432400-60659/root/chroot_tmpdir/scmroot/cockpit-machines'...
$ git fetch origin 48d2131eb388838374b8910889f7c7db7120fe20:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cockpit-machines
 * [new ref]         48d2131eb388838374b8910889f7c7db7120fe20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48d2131 [packit] 308 upstream release