dns revolve workaround for x86

Change-Id: I1b20e0b8430c910ca6b4e980c79e6bac9460fba5

app/src/main/java/syncthing/android/service/SyncthingThread.java

@@ -76,6 +76,7 @@ void realRun(boolean generate) {
         try {
             ProcessBuilder b = new ProcessBuilder();
             b.environment().put("HOME", Environment.getExternalStorageDirectory().getAbsolutePath());
+            b.environment().put("GODEBUG", "netdns=2");
             if (generate) {
                 b.command(SyncthingUtils.getSyncthingBinaryPath(mService),
                         "-home", SyncthingUtils.getConfigDirectory(mService).getAbsolutePath(),

make-go.bash

@@ -73,6 +73,10 @@ mkdir -p "$GOROOT_FINAL"
 
 pushd golang/go/src
 
+if [ $CGO_ENABLED -eq 0 ]; then
+    git am -3 ../../../patches/golang/netgohacks/*
+fi
+
 set +e
 ./clean.bash
 rm -r ../bin

patches/golang/netgohacks/0001-dnsconfig-hack-for-android.patch

@@ -0,0 +1,121 @@
+From 0e08490d04d73fd0e70b7a744b335a95ac17ea95 Mon Sep 17 00:00:00 2001
+From: Andrew Sutherland <dr3wsuth3rland@gmail.com>
+Date: Fri, 16 Oct 2015 23:08:08 -0500
+Subject: [PATCH] dnsconfig hack for android
+
+---
+ src/net/dnsconfig_unix.go | 86 ++++++-----------------------------------------
+ 1 file changed, 10 insertions(+), 76 deletions(-)
+
+diff --git a/src/net/dnsconfig_unix.go b/src/net/dnsconfig_unix.go
+index 6073fdb..b0c612a 100644
+--- a/src/net/dnsconfig_unix.go
++++ b/src/net/dnsconfig_unix.go
+@@ -8,6 +8,11 @@
+
+ package net
+
++import (
++	"os/exec"
++	"strings"
++)
++
+ var defaultNS = []string{"127.0.0.1", "::1"}
+
+ type dnsConfig struct {
+@@ -31,87 +36,16 @@ func dnsReadConfig(filename string) *dnsConfig {
+ 		timeout:  5,
+ 		attempts: 2,
+ 	}
+-	file, err := open(filename)
++	//modified from https://gist.github.com/ernesto-jimenez/8042366
++	out, err := exec.Command("/system/bin/getprop", "net.dns1").Output()
+ 	if err != nil {
++		println("Error looking up dns", err)
+ 		conf.servers = defaultNS
+ 		conf.err = err
+ 		return conf
+ 	}
+-	defer file.close()
+-	for line, ok := file.readLine(); ok; line, ok = file.readLine() {
+-		if len(line) > 0 && (line[0] == ';' || line[0] == '#') {
+-			// comment.
+-			continue
+-		}
+-		f := getFields(line)
+-		if len(f) < 1 {
+-			continue
+-		}
+-		switch f[0] {
+-		case "nameserver": // add one name server
+-			if len(f) > 1 && len(conf.servers) < 3 { // small, but the standard limit
+-				// One more check: make sure server name is
+-				// just an IP address.  Otherwise we need DNS
+-				// to look it up.
+-				if parseIPv4(f[1]) != nil {
+-					conf.servers = append(conf.servers, f[1])
+-				} else if ip, _ := parseIPv6(f[1], true); ip != nil {
+-					conf.servers = append(conf.servers, f[1])
+-				}
+-			}
+-
+-		case "domain": // set search path to just this domain
+-			if len(f) > 1 {
+-				conf.search = []string{f[1]}
+-			}
+-
+-		case "search": // set search path to given servers
+-			conf.search = make([]string, len(f)-1)
+-			for i := 0; i < len(conf.search); i++ {
+-				conf.search[i] = f[i+1]
+-			}
+-
+-		case "options": // magic options
+-			for _, s := range f[1:] {
+-				switch {
+-				case hasPrefix(s, "ndots:"):
+-					n, _, _ := dtoi(s, 6)
+-					if n < 1 {
+-						n = 1
+-					}
+-					conf.ndots = n
+-				case hasPrefix(s, "timeout:"):
+-					n, _, _ := dtoi(s, 8)
+-					if n < 1 {
+-						n = 1
+-					}
+-					conf.timeout = n
+-				case hasPrefix(s, "attempts:"):
+-					n, _, _ := dtoi(s, 9)
+-					if n < 1 {
+-						n = 1
+-					}
+-					conf.attempts = n
+-				case s == "rotate":
+-					conf.rotate = true
+-				default:
+-					conf.unknownOpt = true
+-				}
+-			}
+-
+-		case "lookup":
+-			// OpenBSD option:
+-			// http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man5/resolv.conf.5
+-			// "the legal space-separated values are: bind, file, yp"
+-			conf.lookup = f[1:]
+-
+-		default:
+-			conf.unknownOpt = true
+-		}
+-	}
+-	if len(conf.servers) == 0 {
+-		conf.servers = defaultNS
+-	}
++	println("dnsReadConfig(server=" + string(out) + ")")
++	conf.servers = []string{strings.Trim(string(out), "\n ")}
+ 	return conf
+ }
+
+-- 
+2.5.2
+