m4_divert_push([PREPARE_TESTS])
[
# Strips out uninteresting parts of ovs-ofctl output, as well as parts
# that vary from one run to another.
ofctl_strip () {
    sed '
s/ (xid=0x[0-9a-fA-F]*)//
s/ duration=[0-9.]*s,//
s/ cookie=0x0,//
s/ table=0,//
s/ n_packets=0,//
s/ n_bytes=0,//
s/ idle_age=[0-9]*,//
s/ hard_age=[0-9]*,//
'
}]
m4_divert_pop([PREPARE_TESTS])

m4_define([STRIP_XIDS], [[sed 's/ (xid=0x[0-9a-fA-F]*)//']])
m4_define([STRIP_DURATION], [[sed 's/\bduration=[0-9.]*s/duration=?s/']])
m4_define([TESTABLE_LOG], [-vPATTERN:ANY:'%c|%p|%m'])

# OVS_VSWITCHD_START([vsctl-args], [vsctl-output])
#
# Creates a database and starts ovsdb-server, starts ovs-vswitchd
# connected to that database, calls ovs-vsctl to create a bridge named
# br0 with predictable settings, passing 'vsctl-args' as additional
# commands to ovs-vsctl.  If 'vsctl-args' causes ovs-vsctl to provide
# output (e.g. because it includes "create" commands) then 'vsctl-output'
# specifies the expected output after filtering through uuidfilt.pl.
m4_define([OVS_VSWITCHD_START],
  [OVS_RUNDIR=`pwd`; export OVS_RUNDIR
   OVS_LOGDIR=`pwd`; export OVS_LOGDIR
   OVS_DBDIR=`pwd`; export OVS_DBDIR
   OVS_SYSCONFDIR=`pwd`; export OVS_SYSCONFDIR
   ON_EXIT([kill `cat ovsdb-server.pid ovs-vswitchd.pid`])

   dnl Create database.
   touch .conf.db.~lock~
   AT_CHECK([ovsdb-tool create conf.db $abs_top_srcdir/vswitchd/vswitch.ovsschema])

   dnl Start ovsdb-server.
   AT_CHECK([ovsdb-server --detach --no-chdir --pidfile --log-file --remote=punix:$OVS_RUNDIR/db.sock], [0], [], [stderr])
   AT_CHECK([[sed < stderr '
/vlog|INFO|opened log file/d
/ovsdb_server|INFO|ovsdb-server (Open vSwitch)/d']])
   AT_CAPTURE_FILE([ovsdb-server.log])

   dnl Initialize database.
   AT_CHECK([ovs-vsctl --no-wait init])

   dnl Start ovs-vswitchd.
   AT_CHECK([ovs-vswitchd --detach --no-chdir --pidfile --enable-dummy --disable-system --log-file -vvconn -vofproto_dpif], [0], [], [stderr])
   AT_CAPTURE_FILE([ovs-vswitchd.log])
   AT_CHECK([[sed < stderr '
/vlog|INFO|opened log file/d
/vswitchd|INFO|ovs-vswitchd (Open vSwitch)/d
/reconnect|INFO|/d
/ofproto|INFO|using datapath ID/d
/ofproto|INFO|datapath ID changed to fedcba9876543210/d']])

   dnl Add bridges, ports, etc.
   AT_CHECK([ovs-vsctl -- add-br br0 -- set bridge br0 datapath-type=dummy other-config:datapath-id=fedcba9876543210 other-config:hwaddr=aa:55:aa:55:00:00 fail-mode=secure -- $1 m4_if([$2], [], [], [| perl $srcdir/uuidfilt.pl])], [0], [$2])
])

m4_define([OVS_VSWITCHD_STOP],
  [AT_CHECK([ovs-appctl -t ovs-vswitchd exit])
   AT_CHECK([ovs-appctl -t ovsdb-server exit])])

# ADD_OF_PORTS(BRIDGE, OF_PORT[, OF_PORT...])
#
# Creates a dummy interface with an OpenFlow port number of OF_PORT and
# name of p{OF_PORT}.  The dummy implementation will treat the OF_PORT
# as the datapath port number, which as the effect of making the
# OpenFlow and datapath numbers the same.
m4_define([ADD_OF_PORTS],
 [ovs-vsctl m4_foreach([of_port], m4_cdr($@),
    [ \
    -- add-port $1 p[]of_port -- set Interface p[]of_port type=dummy ofport_request=of_port])])