time: zoneinfo support on darwin/arm

A future change will include an NSTimeZone hook so we can determine
the device's current time zone.

Change-Id: Ia4bd6b955e4cb720c518055541b66ff57a4dd303
Reviewed-on: https://go-review.googlesource.com/6511
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: David Crawshaw <crawshaw@golang.org>

src/time/sleep_test.go

@@ -383,6 +383,10 @@ func TestOverflowSleep(t *testing.T) {
 // Test that a panic while deleting a timer does not leave
 // the timers mutex held, deadlocking a ticker.Stop in a defer.
 func TestIssue5745(t *testing.T) {
+	if runtime.GOOS == "darwin" && runtime.GOARCH == "arm" {
+		t.Skipf("skipping on %s/%s, see issue 10043", runtime.GOOS, runtime.GOARCH)
+	}
+
 	ticker := NewTicker(Hour)
 	defer func() {
 		// would deadlock here before the fix due to

src/time/zoneinfo_darwin_armx.go

@@ -0,0 +1,51 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin
+// +build arm arm64
+
+package time
+
+import "syscall"
+
+var zoneFile string
+
+func init() {
+	wd, err := syscall.Getwd()
+	if err != nil {
+		return
+	}
+
+	// The working directory at initialization is the root of the
+	// app bundle: "/private/.../bundlename.app". That's where we
+	// keep zoneinfo.zip.
+	zoneFile = wd + "/zoneinfo.zip"
+}
+
+func forceZipFileForTesting(zipOnly bool) {
+	// On iOS we only have the zip file.
+}
+
+func initTestingZone() {
+	z, err := loadZoneFile(zoneFile, "America/Los_Angeles")
+	if err != nil {
+		panic("cannot load America/Los_Angeles for testing: " + err.Error())
+	}
+	z.name = "Local"
+	localLoc = *z
+}
+
+func initLocal() {
+	// TODO(crawshaw): [NSTimeZone localTimeZone]
+	localLoc = *UTC
+}
+
+func loadLocation(name string) (*Location, error) {
+	z, err := loadZoneFile(zoneFile, name)
+	if err != nil {
+		return nil, err
+	}
+	z.name = name
+	return z, nil
+}

src/time/zoneinfo_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
+// +build darwin,!arm,!arm64 dragonfly freebsd linux nacl netbsd openbsd solaris
 
 // Parse "zoneinfo" time zone file.
 // This is a fairly standard file format used on OS X, Linux, BSD, Sun, and others.