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// Copyright 2018 The Bazel Authors. 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"
"encoding/json"
"errors"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
)
type mode int
const (
invalidMode mode = iota
archiveMode
copyMode
linkMode
)
func modeFromString(s string) (mode, error) {
switch s {
case "archive":
return archiveMode, nil
case "copy":
return copyMode, nil
case "link":
return linkMode, nil
default:
return invalidMode, fmt.Errorf("invalid mode: %s", s)
}
}
type manifestEntry struct {
Src, Dst string
}
func main() {
log.SetPrefix("GoPath: ")
log.SetFlags(0)
if err := run(os.Args[1:]); err != nil {
log.Fatal(err)
}
}
func run(args []string) error {
var manifest, out string
flags := flag.NewFlagSet("go_path", flag.ContinueOnError)
flags.StringVar(&manifest, "manifest", "", "name of json file listing files to include")
flags.StringVar(&out, "out", "", "output file or directory")
modeFlag := flags.String("mode", "", "copy, link, or archive")
if err := flags.Parse(args); err != nil {
return err
}
if manifest == "" {
return errors.New("-manifest not set")
}
if out == "" {
return errors.New("-out not set")
}
if *modeFlag == "" {
return errors.New("-mode not set")
}
mode, err := modeFromString(*modeFlag)
if err != nil {
return err
}
entries, err := readManifest(manifest)
if err != nil {
return err
}
switch mode {
case archiveMode:
err = archivePath(out, entries)
case copyMode:
err = copyPath(out, entries)
case linkMode:
err = linkPath(out, entries)
}
return err
}
func readManifest(path string) ([]manifestEntry, error) {
data, err := ioutil.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("error reading manifest: %v", err)
}
var entries []manifestEntry
if err := json.Unmarshal(data, &entries); err != nil {
return nil, fmt.Errorf("error unmarshalling manifest %s: %v", path, err)
}
return entries, nil
}
func archivePath(out string, manifest []manifestEntry) (err error) {
outFile, err := os.Create(out)
if err != nil {
return err
}
defer func() {
if e := outFile.Close(); err == nil && e != nil {
err = fmt.Errorf("error closing archive %s: %v", out, e)
}
}()
outZip := zip.NewWriter(outFile)
for _, entry := range manifest {
srcFile, err := os.Open(abs(filepath.FromSlash(entry.Src)))
if err != nil {
return err
}
w, err := outZip.Create(entry.Dst)
if err != nil {
srcFile.Close()
return err
}
if _, err := io.Copy(w, srcFile); err != nil {
srcFile.Close()
return err
}
if err := srcFile.Close(); err != nil {
return err
}
}
if err := outZip.Close(); err != nil {
return fmt.Errorf("error constructing archive %s: %v", out, err)
}
return nil
}
func copyPath(out string, manifest []manifestEntry) error {
if err := os.MkdirAll(out, 0777); err != nil {
return err
}
for _, entry := range manifest {
dst := abs(filepath.Join(out, filepath.FromSlash(entry.Dst)))
if err := os.MkdirAll(filepath.Dir(dst), 0777); err != nil {
return err
}
srcFile, err := os.Open(abs(filepath.FromSlash(entry.Src)))
if err != nil {
return err
}
dstFile, err := os.Create(dst)
if err != nil {
srcFile.Close()
return err
}
if _, err := io.Copy(dstFile, srcFile); err != nil {
dstFile.Close()
srcFile.Close()
return err
}
srcFile.Close()
if err := dstFile.Close(); err != nil {
return err
}
}
return nil
}
func linkPath(out string, manifest []manifestEntry) error {
// out directory may already exist and may contain old symlinks. Delete.
if err := os.RemoveAll(out); err != nil {
return err
}
if err := os.MkdirAll(out, 0777); err != nil {
return err
}
for _, entry := range manifest {
dst := filepath.Join(out, filepath.FromSlash(entry.Dst))
dstDir := filepath.Dir(dst)
src, _ := filepath.Rel(dstDir, entry.Src)
if err := os.MkdirAll(dstDir, 0777); err != nil {
return err
}
if err := os.Symlink(src, dst); err != nil {
return err
}
}
return nil
}
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