#!/bin/rc
#binds the namespace of one process on top of another

rfork e
ifs='
'
while (~ $1 -*){
	switch($1){
	case -o
		only=$2
		shift
		shift
	case -x
		xclude=$2
		shift
		shift
	case -t
		testonly=yes
		shift
	case -r
		riosafe=yes
		shift
	case *
		echo bad flag $1
		shift
	}
}

if(~ $2 ''){
	echo usage: addns MODELpid TARGETpid
	exit usage
	}

if(! test -e /proc/$1){
	echo process $1 does not exist!
	exit no.proc
}
if(! test -e /proc/$2){
	echo process $2 does not exist!
	exit no.proc
}
if(test -e /tmp/chnsuniq)
	rm /tmp/chnsuniq

# find lines in model not contained in target

orig=`{cat /proc/$1/ns}
for (i in $orig){
	search=''^$i^''
	match=`{cat /proc/$2/ns |grep -e $search}
	if(~ $match ''){
		echo $i >> /tmp/chnsuniq
	}
}
if(! test -e /tmp/chnsuniq){
	echo no binds in $1 not in $2 to add
	exit no.binds
}

# convert the list of binds in model not in target into a set of namespace commands

sed 's/^/echo ⊞/g' /tmp/chnsuniq |sed 's/$/⊞ >\/proc\/'$2'\/ns/g'| tr ⊞ '''' |sed '/echo .cd/d' |sed 's/  / /g' |sed '/\#\|\/data/d' |sed '/\#D\/ssl/d' |sed '/\#a\/tls/d' >/tmp/chnscom

if(~ $riosafe yes){
	sed '/\/mnt\/wsys/d' /tmp/chnscom | sed '/\/mnt\/term/d' |sed '/\/dev\/cons/d' |sed '/\/rio/d' >/tmp/chnssafe
	mv /tmp/chnssafe /tmp/chnscom
}
if (! ~ $xclude ''){
	grep -v $xclude /tmp/chnscom >/tmp/chnssafe
	mv /tmp/chnssafe /tmp/chnscom
}
if (! ~ $only ''){
	grep $only /tmp/chnscom >/tmp/chnssafe
	mv /tmp/chnssafe /tmp/chnscom
}
if (test -e /tmp/chnssafe)
	rm /tmp/chnssafe
if(~ $testonly yes){
	cat /tmp/chnscom
	exit
}

# fire off the assembled list of namespace ops and hope the world doesnt explode

. /tmp/chnscom