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Source file src/time/zoneinfo_unix.go

  // Copyright 2009 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,386 darwin,amd64 dragonfly freebsd linux,!android 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.
  // See tzfile(5), http://en.wikipedia.org/wiki/Zoneinfo,
  // and ftp://munnari.oz.au/pub/oldtz/
  
  package time
  
  import (
  	"errors"
  	"runtime"
  	"syscall"
  )
  
  func initTestingZone() {
  	z, err := loadZoneFile(runtime.GOROOT()+"/lib/time/zoneinfo.zip", "America/Los_Angeles")
  	if err != nil {
  		panic("cannot load America/Los_Angeles for testing: " + err.Error())
  	}
  	z.name = "Local"
  	localLoc = *z
  }
  
  // Many systems use /usr/share/zoneinfo, Solaris 2 has
  // /usr/share/lib/zoneinfo, IRIX 6 has /usr/lib/locale/TZ.
  var zoneDirs = []string{
  	"/usr/share/zoneinfo/",
  	"/usr/share/lib/zoneinfo/",
  	"/usr/lib/locale/TZ/",
  	runtime.GOROOT() + "/lib/time/zoneinfo.zip",
  }
  
  var origZoneDirs = zoneDirs
  
  func forceZipFileForTesting(zipOnly bool) {
  	zoneDirs = make([]string, len(origZoneDirs))
  	copy(zoneDirs, origZoneDirs)
  	if zipOnly {
  		for i := 0; i < len(zoneDirs)-1; i++ {
  			zoneDirs[i] = "/XXXNOEXIST"
  		}
  	}
  }
  
  func initLocal() {
  	// consult $TZ to find the time zone to use.
  	// no $TZ means use the system default /etc/localtime.
  	// $TZ="" means use UTC.
  	// $TZ="foo" means use /usr/share/zoneinfo/foo.
  
  	tz, ok := syscall.Getenv("TZ")
  	switch {
  	case !ok:
  		z, err := loadZoneFile("", "/etc/localtime")
  		if err == nil {
  			localLoc = *z
  			localLoc.name = "Local"
  			return
  		}
  	case tz != "" && tz != "UTC":
  		if z, err := loadLocation(tz); err == nil {
  			localLoc = *z
  			return
  		}
  	}
  
  	// Fall back to UTC.
  	localLoc.name = "UTC"
  }
  
  func loadLocation(name string) (*Location, error) {
  	var firstErr error
  	for _, zoneDir := range zoneDirs {
  		if z, err := loadZoneFile(zoneDir, name); err == nil {
  			z.name = name
  			return z, nil
  		} else if firstErr == nil && !isNotExist(err) {
  			firstErr = err
  		}
  	}
  	if firstErr != nil {
  		return nil, firstErr
  	}
  	return nil, errors.New("unknown time zone " + name)
  }
  

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