$ git clone -n https://src.fedoraproject.org/rpms/cockpit.git /var/lib/mock/f42-build-side-1-3586652-46924/root/chroot_tmpdir/scmroot/cockpit
Cloning into '/var/lib/mock/f42-build-side-1-3586652-46924/root/chroot_tmpdir/scmroot/cockpit'...
$ git fetch origin 85e929a5d5f4bf29cefaeed3546cd0cc1e09a7b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cockpit
 * [new ref]         85e929a5d5f4bf29cefaeed3546cd0cc1e09a7b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85e929a Update to 342 upstream release