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
175
176
177
178
179
180
181
|
// Copyright 2012, 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package filestorage
import (
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"sort"
"strings"
"launchpad.net/juju-core/environs/storage"
coreerrors "launchpad.net/juju-core/errors"
"launchpad.net/juju-core/utils"
)
// fileStorageReader implements StorageReader backed
// by the local filesystem.
type fileStorageReader struct {
path string
}
// NewFileStorageReader returns a new storage reader for
// a directory inside the local file system.
func NewFileStorageReader(path string) (reader storage.StorageReader, err error) {
var p string
if p, err = utils.NormalizePath(path); err != nil {
return nil, err
}
if p, err = filepath.Abs(p); err != nil {
return nil, err
}
fi, err := os.Stat(p)
if err != nil {
return nil, err
}
if !fi.Mode().IsDir() {
return nil, fmt.Errorf("specified source path is not a directory: %s", path)
}
return &fileStorageReader{p}, nil
}
func (f *fileStorageReader) fullPath(name string) string {
return filepath.Join(f.path, name)
}
// Get implements storage.StorageReader.Get.
func (f *fileStorageReader) Get(name string) (io.ReadCloser, error) {
if isInternalPath(name) {
return nil, &os.PathError{
Op: "Get",
Path: name,
Err: os.ErrNotExist,
}
}
filename := f.fullPath(name)
fi, err := os.Stat(filename)
if err != nil {
if os.IsNotExist(err) {
err = coreerrors.NewNotFoundError(err, "")
}
return nil, err
} else if fi.IsDir() {
return nil, coreerrors.NotFoundf("no such file with name %q", name)
}
file, err := os.Open(filename)
if err != nil {
return nil, err
}
return file, nil
}
// isInternalPath returns true if a path should be hidden from user visibility
// filestorage uses ".tmp/" as a staging directory for uploads, so we don't
// want it to be visible
func isInternalPath(path string) bool {
// This blocks both ".tmp", ".tmp/foo" but also ".tmpdir", better to be
// overly restrictive to start with
return strings.HasPrefix(path, ".tmp")
}
// List implements storage.StorageReader.List.
func (f *fileStorageReader) List(prefix string) ([]string, error) {
var names []string
if isInternalPath(prefix) {
return names, nil
}
prefix = filepath.Join(f.path, prefix)
dir := filepath.Dir(prefix)
err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.IsDir() && strings.HasPrefix(path, prefix) {
names = append(names, path[len(f.path)+1:])
}
return nil
})
if err != nil && !os.IsNotExist(err) {
return nil, err
}
sort.Strings(names)
return names, nil
}
// URL implements storage.StorageReader.URL.
func (f *fileStorageReader) URL(name string) (string, error) {
return "file://" + filepath.Join(f.path, name), nil
}
// ConsistencyStrategy implements storage.StorageReader.ConsistencyStrategy.
func (f *fileStorageReader) DefaultConsistencyStrategy() utils.AttemptStrategy {
return utils.AttemptStrategy{}
}
// ShouldRetry is specified in the StorageReader interface.
func (f *fileStorageReader) ShouldRetry(err error) bool {
return false
}
type fileStorageWriter struct {
fileStorageReader
}
// NewFileStorageWriter returns a new read/write storag for
// a directory inside the local file system.
func NewFileStorageWriter(path string) (storage.Storage, error) {
reader, err := NewFileStorageReader(path)
if err != nil {
return nil, err
}
return &fileStorageWriter{*reader.(*fileStorageReader)}, nil
}
func (f *fileStorageWriter) Put(name string, r io.Reader, length int64) error {
if isInternalPath(name) {
return &os.PathError{
Op: "Put",
Path: name,
Err: os.ErrPermission,
}
}
fullpath := f.fullPath(name)
dir := filepath.Dir(fullpath)
if err := os.MkdirAll(dir, 0755); err != nil {
return err
}
tmpdir := filepath.Join(f.path, ".tmp")
if err := os.MkdirAll(tmpdir, 0755); err != nil {
return err
}
defer os.Remove(tmpdir)
// Write to a temporary file first, and then move (atomically).
file, err := ioutil.TempFile(tmpdir, "juju-filestorage-")
if err != nil {
return err
}
_, err = io.CopyN(file, r, length)
file.Close()
if err != nil {
os.Remove(file.Name())
return err
}
return utils.ReplaceFile(file.Name(), fullpath)
}
func (f *fileStorageWriter) Remove(name string) error {
fullpath := f.fullPath(name)
err := os.Remove(fullpath)
if os.IsNotExist(err) {
err = nil
}
return err
}
func (f *fileStorageWriter) RemoveAll() error {
return storage.RemoveAll(f)
}
|