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ip/ipconfig: set ndb database file with -f argument

--- a/sys/man/8/ipconfig

+++ b/sys/man/8/ipconfig

@@ -18,6 +18,8 @@

 .IR mtu ]

 .RB [ -o

 .IR dhcp-opt ]

+.RB [ -f

+.IR dbfile ]

 .RB [ -x

 .IR netmtpt ]

 [

@@ -226,6 +228,10 @@

 disable IPv6 duplicate discovery detection,

 which removes any existing ARP table entry for one of our IPv6 addresses

 before adding new ones.

+.TP

+.B f

+use the ndb database file

+.I dbfile .

 .TP

 .B x

 use the IP stack mounted at

--- a/sys/src/cmd/ip/ipconfig/main.c

+++ b/sys/src/cmd/ip/ipconfig/main.c

@@ -149,6 +149,7 @@

 Ipifc	*ifc;

 int	ipv6auto = 0;

 int	myifc = -1;

+char	*dbfile;

 char	*ndboptions;

 int	nip;

 int	noconfig;

@@ -226,7 +227,7 @@

 {

 	fprint(2, "usage: %s [-6dDGnNOpPruX][-b baud][-c ctl]* [-g gw]"

 		"[-h host][-m mtu]\n"

-		"\t[-x mtpt][-o dhcpopt] type dev [verb] [laddr [mask "

+		"\t[-f dbfile][-x mtpt][-o dhcpopt] type dev [verb] [laddr [mask "

 		"[raddr [fs [auth]]]]]\n", argv0);

 	exits("usage");

 }

@@ -519,6 +520,9 @@

 	case 'D':

 		debug = 1;

 		break;

+	case 'f':

+		dbfile = EARGF(usage());

+		break;

 	case 'g':

 		if (parseip(conf.gaddr, EARGF(usage())) == -1)

 			usage();

@@ -1823,7 +1827,7 @@

 	Ndb *db;

 	Ndbtuple *t, *nt;

-	db = ndbopen(0);

+	db = ndbopen(dbfile);

 	if(db == nil)

 		sysfatal("can't open ndb: %r");

 	if (strcmp(conf.type, "ether") != 0 && strcmp(conf.type, "gbe") != 0 ||