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package main
import (
"archive/zip"
"log"
"os"
"path"
"runtime"
"sort"
"sync"
"time"
)
var timeLocs []string
var tlOnce sync.Once
func findfiles(p, prefix string, files []string) []string {
d, err := os.Open(p)
if err != nil {
return files
}
defer d.Close()
infos, err := d.Readdir(-1)
if err != nil {
return files
}
for _, info := range infos {
if info.Mode().IsRegular() {
files = append(files, prefix+info.Name())
} else if info.IsDir() {
files = findfiles(path.Join(p, info.Name()), info.Name()+"/", files)
}
}
return files
}
func listTimeLocations() ([]string, error) {
for _, p := range []string{"/usr/share/zoneinfo", "/usr/share/lib/zoneinfo", "/usr/lib/locale/TZ"} {
files := findfiles(p, "", nil)
duprem := make(map[string]bool)
for _, loc := range files {
if _, err := time.LoadLocation(loc); err == nil {
duprem[loc] = true
}
}
var locs []string
for loc := range duprem {
locs = append(locs, loc)
}
if len(locs) > 0 {
sort.Strings(locs)
return locs, nil
}
}
zoneinfoZip := path.Join(runtime.GOROOT(), "lib", "time", "zoneinfo.zip")
z, err := zip.OpenReader(zoneinfoZip)
if err != nil {
return nil, err
}
defer z.Close()
locs := []string{}
for _, f := range z.File {
if f.Name[len(f.Name)-1] == '/' {
continue
}
locs = append(locs, f.Name)
}
sort.Strings(locs)
return locs, nil
}
func loadTimeLocs() {
tlOnce.Do(func() {
var err error
if timeLocs, err = listTimeLocations(); err != nil {
log.Fatalf("Could not load time locations: %s", err)
}
})
}
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