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// Copyright 2014 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.
// Mkzip creates a zip file from a 'proto' file describing the contents.
//
// The proto file is inspired by the Plan 9 mkfs prototype file format.
// It describes a file tree, one directory per line, with leading tab
// indentation marking the tree structure. Each line contains a leading
// name field giving the name of the file to copy into the zip file,
// and then a sequence of optional key=value attributes to control
// the copy. The only known attribute is src=foo, meaning copy the
// actual data for the file (or directory) from an alternate location.
package main
import (
"archive/zip"
"bufio"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path"
"path/filepath"
"strings"
)
func usage() {
fmt.Fprintf(os.Stderr, "usage: mkzip [-r root] src.proto out.zip\n")
os.Exit(2)
}
func sysfatal(format string, args ...interface{}) {
fmt.Fprintf(os.Stderr, "mkzip: %s\n", fmt.Sprintf(format, args...))
os.Exit(2)
}
var (
root = flag.String("r", ".", "interpret source paths relative to this directory")
gopackage = flag.String("p", "", "write Go source file in this package")
)
type stack struct {
name string
src string
depth int
}
func main() {
log.SetFlags(0)
flag.Usage = usage
flag.Parse()
args := flag.Args()
if len(args) != 2 {
usage()
}
rf, err := os.Open(args[0])
if err != nil {
sysfatal("%v", err)
}
r := bufio.NewScanner(rf)
zf, err := os.Create(args[1])
if err != nil {
sysfatal("%v", err)
}
var w io.Writer = zf
if *gopackage != "" {
fmt.Fprintf(zf, "package %s\n\nfunc init() {\n\tunzip(\"", *gopackage)
gw := &goWriter{b: bufio.NewWriter(w)}
defer func() {
if err := gw.Close(); err != nil {
sysfatal("finishing Go output: %v", err)
}
}()
w = gw
}
z := zip.NewWriter(w)
lineno := 0
addfile := func(info os.FileInfo, dst string, src string) {
zh, err := zip.FileInfoHeader(info)
if err != nil {
sysfatal("%s:%d: %s: %v", args[0], lineno, src, err)
}
zh.Name = dst
zh.Method = zip.Deflate
if info.IsDir() && !strings.HasSuffix(dst, "/") {
zh.Name += "/"
}
w, err := z.CreateHeader(zh)
if err != nil {
sysfatal("%s:%d: %s: %v", args[0], lineno, src, err)
}
if info.IsDir() {
return
}
r, err := os.Open(src)
if err != nil {
sysfatal("%s:%d: %s: %v", args[0], lineno, src, err)
}
defer r.Close()
if _, err := io.Copy(w, r); err != nil {
sysfatal("%s:%d: %s: %v", args[0], lineno, src, err)
}
}
var stk []stack
for r.Scan() {
line := r.Text()
lineno++
s := strings.TrimLeft(line, "\t")
prefix, line := line[:len(line)-len(s)], s
if i := strings.Index(line, "#"); i >= 0 {
line = line[:i]
}
f := strings.Fields(line)
if len(f) == 0 {
continue
}
if strings.HasPrefix(line, " ") {
sysfatal("%s:%d: must use tabs for indentation", args[0], lineno)
}
depth := len(prefix)
for len(stk) > 0 && depth <= stk[len(stk)-1].depth {
stk = stk[:len(stk)-1]
}
parent := ""
psrc := *root
if len(stk) > 0 {
parent = stk[len(stk)-1].name
psrc = stk[len(stk)-1].src
}
if strings.Contains(f[0], "/") {
sysfatal("%s:%d: destination name cannot contain slash", args[0], lineno)
}
name := path.Join(parent, f[0])
src := filepath.Join(psrc, f[0])
for _, attr := range f[1:] {
i := strings.Index(attr, "=")
if i < 0 {
sysfatal("%s:%d: malformed attribute %q", args[0], lineno, attr)
}
key, val := attr[:i], attr[i+1:]
switch key {
case "src":
src = val
default:
sysfatal("%s:%d: unknown attribute %q", args[0], lineno, attr)
}
}
stk = append(stk, stack{name: name, src: src, depth: depth})
if f[0] == "*" || f[0] == "+" {
if f[0] == "*" {
dir, err := ioutil.ReadDir(psrc)
if err != nil {
sysfatal("%s:%d: %v", args[0], lineno, err)
}
for _, d := range dir {
addfile(d, path.Join(parent, d.Name()), filepath.Join(psrc, d.Name()))
}
} else {
err := filepath.Walk(psrc, func(src string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if src == psrc {
return nil
}
if psrc == "." {
psrc = ""
}
name := path.Join(parent, filepath.ToSlash(src[len(psrc):]))
addfile(info, name, src)
return nil
})
if err != nil {
sysfatal("%s:%d: %v", args[0], lineno, err)
}
}
continue
}
fi, err := os.Stat(src)
if err != nil {
sysfatal("%s:%d: %v", args[0], lineno, err)
}
addfile(fi, name, src)
}
if err := z.Close(); err != nil {
sysfatal("finishing zip file: %v", err)
}
}
type goWriter struct {
b *bufio.Writer
}
func (w *goWriter) Write(b []byte) (int, error) {
for _, c := range b {
fmt.Fprintf(w.b, "\\x%02x", c)
}
return len(b), nil
}
func (w *goWriter) Close() error {
fmt.Fprintf(w.b, "\")\n}\n")
w.b.Flush()
return nil
}
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