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
|
// Copyright 2016 the Go-FUSE Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package zipfs
import (
"archive/tar"
"bytes"
"compress/bzip2"
"compress/gzip"
"context"
"io"
"log"
"os"
"path/filepath"
"strings"
"syscall"
"github.com/hanwen/go-fuse/v2/fs"
"github.com/hanwen/go-fuse/v2/fuse"
)
// TODO - handle symlinks.
// HeaderToFileInfo fills a fuse.Attr struct from a tar.Header.
func HeaderToFileInfo(out *fuse.Attr, h *tar.Header) {
out.Mode = uint32(h.Mode)
out.Size = uint64(h.Size)
out.Uid = uint32(h.Uid)
out.Gid = uint32(h.Gid)
out.SetTimes(&h.AccessTime, &h.ModTime, &h.ChangeTime)
}
type tarRoot struct {
fs.Inode
rc io.ReadCloser
}
// tarRoot implements NodeOnAdder
var _ = (fs.NodeOnAdder)((*tarRoot)(nil))
func (r *tarRoot) OnAdd(ctx context.Context) {
tr := tar.NewReader(r.rc)
defer r.rc.Close()
var longName *string
for {
hdr, err := tr.Next()
if err == io.EOF {
// end of tar archive
break
}
if err != nil {
log.Printf("Add: %v", err)
// XXX handle error
break
}
if hdr.Typeflag == 'L' {
buf := bytes.NewBuffer(make([]byte, 0, hdr.Size))
io.Copy(buf, tr)
s := buf.String()
longName = &s
continue
}
if longName != nil {
hdr.Name = *longName
longName = nil
}
buf := bytes.NewBuffer(make([]byte, 0, hdr.Size))
io.Copy(buf, tr)
dir, base := filepath.Split(filepath.Clean(hdr.Name))
p := r.EmbeddedInode()
for _, comp := range strings.Split(dir, "/") {
if len(comp) == 0 {
continue
}
ch := p.GetChild(comp)
if ch == nil {
ch = p.NewPersistentInode(ctx,
&fs.Inode{},
fs.StableAttr{Mode: syscall.S_IFDIR})
p.AddChild(comp, ch, false)
}
p = ch
}
var attr fuse.Attr
HeaderToFileInfo(&attr, hdr)
switch hdr.Typeflag {
case tar.TypeSymlink:
l := &fs.MemSymlink{
Data: []byte(hdr.Linkname),
}
l.Attr = attr
p.AddChild(base, r.NewPersistentInode(ctx, l, fs.StableAttr{Mode: syscall.S_IFLNK}), false)
case tar.TypeLink:
log.Println("don't know how to handle Typelink")
case tar.TypeChar:
rf := &fs.MemRegularFile{}
rf.Attr = attr
p.AddChild(base, r.NewPersistentInode(ctx, rf, fs.StableAttr{Mode: syscall.S_IFCHR}), false)
case tar.TypeBlock:
rf := &fs.MemRegularFile{}
rf.Attr = attr
p.AddChild(base, r.NewPersistentInode(ctx, rf, fs.StableAttr{Mode: syscall.S_IFBLK}), false)
case tar.TypeDir:
rf := &fs.MemRegularFile{}
rf.Attr = attr
p.AddChild(base, r.NewPersistentInode(ctx, rf, fs.StableAttr{Mode: syscall.S_IFDIR}), false)
case tar.TypeFifo:
rf := &fs.MemRegularFile{}
rf.Attr = attr
p.AddChild(base, r.NewPersistentInode(ctx, rf, fs.StableAttr{Mode: syscall.S_IFIFO}), false)
case tar.TypeReg, tar.TypeRegA:
df := &fs.MemRegularFile{
Data: buf.Bytes(),
}
df.Attr = attr
p.AddChild(base, r.NewPersistentInode(ctx, df, fs.StableAttr{}), false)
default:
log.Printf("entry %q: unsupported type '%c'", hdr.Name, hdr.Typeflag)
}
}
}
type readCloser struct {
io.Reader
close func() error
}
func (rc *readCloser) Close() error {
return rc.close()
}
// NewTarCompressedTree creates the tree of a tar file as a FUSE
// InodeEmbedder. The inode can either be mounted as the root of a
// FUSE mount, or added as a child to some other FUSE tree.
func NewTarCompressedTree(name string, format string) (fs.InodeEmbedder, error) {
f, err := os.Open(name)
if err != nil {
return nil, err
}
var stream io.ReadCloser
switch format {
case "gz":
unzip, err := gzip.NewReader(f)
if err != nil {
return nil, err
}
stream = &readCloser{
unzip,
f.Close,
}
case "bz2":
unzip := bzip2.NewReader(f)
stream = &readCloser{
unzip,
f.Close,
}
}
return &tarRoot{rc: stream}, nil
}
|
