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bootrc: add ndb/dnsgetip resolver to bootfs so domain names can be used for fs=, auth= and secstore= (thanks mischief)

--- a/sys/src/9/boot/net.rc

+++ b/sys/src/9/boot/net.rc

@@ -25,6 +25,13 @@

 	if(~ $#auth 0)

 		ask auth ' ip is? ' $fs(1)

+	# resolve dns names

+	if(test -x /bin/ndb/dnsgetip){

+		for(i in fs auth secstore){

+			$i=`{for(x in $$i) ndb/dnsgetip -a $x}

+		}

+	}

+

 	# set bootstrap authservers for factotum

 	if(! ~ $#auth 0){

 		grep -v '^[ 	]*auth=' /net/ndb >/env/x

--- a/sys/src/9/port/bootfs.proto

+++ b/sys/src/9/port/bootfs.proto

@@ -27,6 +27,8 @@

 		mntgen

 		mount

 		mv

+		ndb

+			dnsgetip

 		hjfs

 		rc

 		rm