diff options
Diffstat (limited to 'src/time/zoneinfo_unix.go')
-rw-r--r-- | src/time/zoneinfo_unix.go | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/time/zoneinfo_unix.go b/src/time/zoneinfo_unix.go new file mode 100644 index 000000000..ab7e4612e --- /dev/null +++ b/src/time/zoneinfo_unix.go @@ -0,0 +1,84 @@ +// 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 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. +// 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) { + for _, zoneDir := range zoneDirs { + if z, err := loadZoneFile(zoneDir, name); err == nil { + z.name = name + return z, nil + } + } + return nil, errors.New("unknown time zone " + name) +} |