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// Copyright 2022 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.
//go:build ignore
// Mkzip writes a zoneinfo.zip with the content of the current directory
// and its subdirectories, with no compression, suitable for package time.
//
// Usage:
//
// go run ../../mkzip.go ../../zoneinfo.zip
//
// We use this program instead of 'zip -0 -r ../../zoneinfo.zip *' to get
// a reproducible generator that does not depend on which version of the
// external zip tool is used or the ordering of file names in a directory
// or the current time.
package main
import (
"archive/zip"
"bytes"
"flag"
"fmt"
"hash/crc32"
"io/fs"
"log"
"os"
"path/filepath"
"strings"
)
func usage() {
fmt.Fprintf(os.Stderr, "usage: go run mkzip.go ../../zoneinfo.zip\n")
os.Exit(2)
}
func main() {
log.SetPrefix("mkzip: ")
log.SetFlags(0)
flag.Usage = usage
flag.Parse()
args := flag.Args()
if len(args) != 1 || !strings.HasSuffix(args[0], ".zip") {
usage()
}
var zb bytes.Buffer
zw := zip.NewWriter(&zb)
seen := make(map[string]bool)
err := filepath.WalkDir(".", func(path string, d fs.DirEntry, err error) error {
if d.IsDir() {
return nil
}
data, err := os.ReadFile(path)
if err != nil {
log.Fatal(err)
}
if strings.HasSuffix(path, ".zip") {
log.Fatalf("unexpected file during walk: %s", path)
}
name := filepath.ToSlash(path)
w, err := zw.CreateRaw(&zip.FileHeader{
Name: name,
Method: zip.Store,
CompressedSize64: uint64(len(data)),
UncompressedSize64: uint64(len(data)),
CRC32: crc32.ChecksumIEEE(data),
})
if err != nil {
log.Fatal(err)
}
if _, err := w.Write(data); err != nil {
log.Fatal(err)
}
seen[name] = true
return nil
})
if err != nil {
log.Fatal(err)
}
if err := zw.Close(); err != nil {
log.Fatal(err)
}
if len(seen) == 0 {
log.Fatalf("did not find any files to add")
}
if !seen["US/Eastern"] {
log.Fatalf("did not find US/Eastern to add")
}
if err := os.WriteFile(args[0], zb.Bytes(), 0666); err != nil {
log.Fatal(err)
}
}