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// Copyright 2018 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"archive/zip"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"strings"
)
var (
outputDir = flag.String("d", "", "output dir")
outputFile = flag.String("l", "", "output list file")
filter = flag.String("f", "", "optional filter pattern")
zipPrefix = flag.String("zip-prefix", "", "optional prefix within the zip file to extract, stripping the prefix")
)
func must(err error) {
if err != nil {
log.Fatal(err)
}
}
func writeFile(filename string, in io.Reader, perm os.FileMode) error {
out, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
if err != nil {
return err
}
_, err = io.Copy(out, in)
if err != nil {
out.Close()
return err
}
return out.Close()
}
func main() {
flag.Usage = func() {
fmt.Fprintln(os.Stderr, "usage: zipsync -d <output dir> [-l <output file>] [-f <pattern>] [zip]...")
flag.PrintDefaults()
}
flag.Parse()
if *outputDir == "" {
flag.Usage()
os.Exit(1)
}
inputs := flag.Args()
// For now, just wipe the output directory and replace its contents with the zip files
// Eventually this could only modify the directory contents as necessary to bring it up
// to date with the zip files.
must(os.RemoveAll(*outputDir))
must(os.MkdirAll(*outputDir, 0777))
var files []string
seen := make(map[string]string)
if *zipPrefix != "" {
*zipPrefix = filepath.Clean(*zipPrefix) + "/"
}
for _, input := range inputs {
reader, err := zip.OpenReader(input)
if err != nil {
log.Fatal(err)
}
defer reader.Close()
for _, f := range reader.File {
name := f.Name
if *zipPrefix != "" {
if !strings.HasPrefix(name, *zipPrefix) {
continue
}
name = strings.TrimPrefix(name, *zipPrefix)
}
if *filter != "" {
if match, err := filepath.Match(*filter, filepath.Base(name)); err != nil {
log.Fatal(err)
} else if !match {
continue
}
}
if filepath.IsAbs(name) {
log.Fatalf("%q in %q is an absolute path", name, input)
}
if prev, exists := seen[name]; exists {
log.Fatalf("%q found in both %q and %q", name, prev, input)
}
seen[name] = input
filename := filepath.Join(*outputDir, name)
if f.FileInfo().IsDir() {
must(os.MkdirAll(filename, 0777))
} else {
must(os.MkdirAll(filepath.Dir(filename), 0777))
in, err := f.Open()
if err != nil {
log.Fatal(err)
}
must(writeFile(filename, in, f.FileInfo().Mode()))
in.Close()
files = append(files, filename)
}
}
}
if *outputFile != "" {
data := strings.Join(files, "\n")
if len(files) > 0 {
data += "\n"
}
must(ioutil.WriteFile(*outputFile, []byte(data), 0666))
}
}
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