1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
// Copyright 2019 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"
"context"
"fmt"
"hash/crc32"
"io"
"io/ioutil"
"os"
"path/filepath"
)
// ZipArtifact represents a zip file that may be local or remote.
type ZipArtifact interface {
// Files returns the list of files contained in the zip file.
Files() ([]*ZipArtifactFile, error)
// Close closes the zip file artifact.
Close()
}
// localZipArtifact is a handle to a local zip file artifact.
type localZipArtifact struct {
zr *zip.ReadCloser
files []*ZipArtifactFile
}
// NewLocalZipArtifact returns a ZipArtifact for a local zip file..
func NewLocalZipArtifact(name string) (ZipArtifact, error) {
zr, err := zip.OpenReader(name)
if err != nil {
return nil, err
}
var files []*ZipArtifactFile
for _, zf := range zr.File {
files = append(files, &ZipArtifactFile{zf})
}
return &localZipArtifact{
zr: zr,
files: files,
}, nil
}
// Files returns the list of files contained in the local zip file artifact.
func (z *localZipArtifact) Files() ([]*ZipArtifactFile, error) {
return z.files, nil
}
// Close closes the buffered reader of the local zip file artifact.
func (z *localZipArtifact) Close() {
z.zr.Close()
}
// ZipArtifactFile contains a zip.File handle to the data inside the remote *-target_files-*.zip
// build artifact.
type ZipArtifactFile struct {
*zip.File
}
// Extract begins extract a file from inside a ZipArtifact. It returns an
// ExtractedZipArtifactFile handle.
func (zf *ZipArtifactFile) Extract(ctx context.Context, dir string,
limiter chan bool) *ExtractedZipArtifactFile {
d := &ExtractedZipArtifactFile{
initCh: make(chan struct{}),
}
go func() {
defer close(d.initCh)
limiter <- true
defer func() { <-limiter }()
zr, err := zf.Open()
if err != nil {
d.err = err
return
}
defer zr.Close()
crc := crc32.NewIEEE()
r := io.TeeReader(zr, crc)
if filepath.Clean(zf.Name) != zf.Name {
d.err = fmt.Errorf("invalid filename %q", zf.Name)
return
}
path := filepath.Join(dir, zf.Name)
err = os.MkdirAll(filepath.Dir(path), 0777)
if err != nil {
d.err = err
return
}
err = os.Remove(path)
if err != nil && !os.IsNotExist(err) {
d.err = err
return
}
if zf.Mode().IsRegular() {
w, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, zf.Mode())
if err != nil {
d.err = err
return
}
defer w.Close()
_, err = io.Copy(w, r)
if err != nil {
d.err = err
return
}
} else if zf.Mode()&os.ModeSymlink != 0 {
target, err := ioutil.ReadAll(r)
if err != nil {
d.err = err
return
}
err = os.Symlink(string(target), path)
if err != nil {
d.err = err
return
}
} else {
d.err = fmt.Errorf("unknown mode %q", zf.Mode())
return
}
if crc.Sum32() != zf.CRC32 {
d.err = fmt.Errorf("crc mismatch for %v", zf.Name)
return
}
d.path = path
}()
return d
}
// ExtractedZipArtifactFile is a handle to a downloaded file from a remoteZipArtifact. The download
// may still be in progress, and will be complete with Path() returns.
type ExtractedZipArtifactFile struct {
initCh chan struct{}
err error
path string
}
// Path returns the path to the downloaded file and any errors that occurred during the download.
// It will block until the download is complete.
func (d *ExtractedZipArtifactFile) Path() (string, error) {
<-d.initCh
return d.path, d.err
}
|
