Fix up tests for DNS changes

Now that `weave dns-args` doesn't parse any flags we need to
call it or not call it, which `start_container` will do for us.

Also add back the part of the test where we run weaver with and
without DNS, which had become lost in 8b061fd555

Also change a couple of tests to use proxy to start containers,
again to avoid needing `dns-args` to parse flags.

test/225_dns_subdomain_test.sh

@@ -13,9 +13,9 @@ start_suite "Resolve names in custom domain with subdomains"
 
 weave_on $HOST1 launch --log-level=debug --dns-domain $DOMAIN.
 
-start_container_with_dns $HOST1 $C1/24 --name=c1 -h foo.$SUBDOMAIN1
-start_container_with_dns $HOST1 $C2/24 --name=c2 -h foo.$SUBDOMAIN2
-start_container_with_dns $HOST1 $C3/24 --name=c3 -h tre.$SUBDOMAIN1 --dns-search=$SUBDOMAIN2
+proxy_start_container_with_dns $HOST1 -e WEAVE_CIDR=$C1/24 --name=c1 -h foo.$SUBDOMAIN1
+proxy_start_container_with_dns $HOST1 -e WEAVE_CIDR=$C2/24 --name=c2 -h foo.$SUBDOMAIN2
+proxy_start_container_with_dns $HOST1 -e WEAVE_CIDR=$C3/24 --name=c3 -h tre.$SUBDOMAIN1 --dns-search=$SUBDOMAIN2
 
 assert_dns_record   $HOST1 c1 foo.$SUBDOMAIN2 $C2
 assert_dns_a_record $HOST1 c3 foo             $C2 foo.$SUBDOMAIN2

test/230_dns_unqualified_test.sh

@@ -13,9 +13,9 @@ start_suite "Resolve unqualified names"
 
 weave_on $HOST1 launch
 
-start_container          $HOST1 $C1/24 --name=c1 -h $NAME
-start_container_with_dns $HOST1 $C2/24 --name=c2 -h seetwo.$DOMAIN
-start_container_with_dns $HOST1 $C3/24 --name=c3 --dns-search=$DOMAIN
+proxy_start_container          $HOST1 -e WEAVE_CIDR=$C1/24 --name=c1 -h $NAME
+proxy_start_container_with_dns $HOST1 -e WEAVE_CIDR=$C2/24 --name=c2 -h seetwo.$DOMAIN
+proxy_start_container_with_dns $HOST1 -e WEAVE_CIDR=$C3/24 --name=c3 --dns-search=$DOMAIN
 container=$(start_container_with_dns $HOST1 $C4/24)
 
 assert_dns_a_record $HOST1 c2           seeone     $C1 $NAME

test/280_with_or_without_dns_test.sh

@@ -7,14 +7,15 @@ TARGET=seetwo.weave.local
 TARGET_IP=10.2.0.78
 STATIC=static.name
 STATIC_IP=10.9.9.9
+ATTACH_ARGS="--rewrite-hosts --add-host=$STATIC:$STATIC_IP"
 
 check_dns() {
     chk=$1
     shift
 
-    container=$(docker_on $HOST1 run $(dns_args $HOST1 "$@") -dt $DNS_IMAGE /bin/sh)
-    weave_on $HOST1 attach $IP/24 "$@" --rewrite-hosts --add-host=$STATIC:$STATIC_IP $container
+    container=$(start_container_with_dns $HOST1 "$@" $IP/24)
     $chk $HOST1 $container $TARGET
+    # --add-host adds to /etc/hosts so should work even when DNS is off.
     assert_dns_record $HOST1 $container $STATIC $STATIC_IP
     rm_containers $HOST1 $container
 }
@@ -22,10 +23,18 @@ check_dns() {
 start_suite "With or without DNS test"
 
 # Assert behaviour without weaveDNS running
-weave_on $HOST1 launch
+weave_on $HOST1 launch --no-dns
 
 start_container $HOST1 $TARGET_IP/24 --name c2 -h $TARGET
 
+check_dns assert_no_dns_record --without-dns
+check_dns assert_no_dns_record
+
+weave_on $HOST1 stop
+
+# Assert behaviour with weaveDNS
+weave_on $HOST1 launch
+
 check_dns assert_no_dns_record --without-dns
 check_dns assert_dns_record
 

test/config.sh

@@ -189,7 +189,7 @@ start_container_image() {
     fi
     is_cidr "$1" && { cidr=$1; shift; }
     container=$(docker_on $host run $weave_dns_args $name_args "$@" -dt $image /bin/sh)
-    if ! weave_on $host attach $cidr $container >/dev/null ; then
+    if ! weave_on $host attach $cidr $ATTACH_ARGS $container >/dev/null ; then
         docker_on $host rm -f $container
         return 1
     fi