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
|
package fsutil
import (
"context"
"io"
"io/ioutil"
"os"
"path"
"path/filepath"
"sort"
"strings"
"github.com/pkg/errors"
"github.com/tonistiigi/fsutil/types"
)
type FS interface {
Walk(context.Context, filepath.WalkFunc) error
Open(string) (io.ReadCloser, error)
}
func NewFS(root string, opt *WalkOpt) FS {
return &fs{
root: root,
opt: opt,
}
}
type fs struct {
root string
opt *WalkOpt
}
func (fs *fs) Walk(ctx context.Context, fn filepath.WalkFunc) error {
return Walk(ctx, fs.root, fs.opt, fn)
}
func (fs *fs) Open(p string) (io.ReadCloser, error) {
return os.Open(filepath.Join(fs.root, p))
}
type Dir struct {
Stat types.Stat
FS FS
}
func SubDirFS(dirs []Dir) (FS, error) {
sort.Slice(dirs, func(i, j int) bool {
return dirs[i].Stat.Path < dirs[j].Stat.Path
})
m := map[string]Dir{}
for _, d := range dirs {
if path.Base(d.Stat.Path) != d.Stat.Path {
return nil, errors.Errorf("subdir %s must be single file", d.Stat.Path)
}
if _, ok := m[d.Stat.Path]; ok {
return nil, errors.Errorf("invalid path %s", d.Stat.Path)
}
m[d.Stat.Path] = d
}
return &subDirFS{m: m, dirs: dirs}, nil
}
type subDirFS struct {
m map[string]Dir
dirs []Dir
}
func (fs *subDirFS) Walk(ctx context.Context, fn filepath.WalkFunc) error {
for _, d := range fs.dirs {
fi := &StatInfo{Stat: &d.Stat}
if !fi.IsDir() {
return errors.Errorf("fs subdir %s not mode directory", d.Stat.Path)
}
if err := fn(d.Stat.Path, fi, nil); err != nil {
return err
}
if err := d.FS.Walk(ctx, func(p string, fi os.FileInfo, err error) error {
stat, ok := fi.Sys().(*types.Stat)
if !ok {
return errors.Wrapf(err, "invalid fileinfo without stat info: %s", p)
}
stat.Path = path.Join(d.Stat.Path, stat.Path)
if stat.Linkname != "" {
if fi.Mode()&os.ModeSymlink != 0 {
if strings.HasPrefix(stat.Linkname, "/") {
stat.Linkname = path.Join("/"+d.Stat.Path, stat.Linkname)
}
} else {
stat.Linkname = path.Join(d.Stat.Path, stat.Linkname)
}
}
return fn(filepath.Join(d.Stat.Path, p), &StatInfo{stat}, nil)
}); err != nil {
return err
}
}
return nil
}
func (fs *subDirFS) Open(p string) (io.ReadCloser, error) {
parts := strings.SplitN(filepath.Clean(p), string(filepath.Separator), 2)
if len(parts) == 0 {
return ioutil.NopCloser(&emptyReader{}), nil
}
d, ok := fs.m[parts[0]]
if !ok {
return nil, os.ErrNotExist
}
return d.FS.Open(parts[1])
}
type emptyReader struct {
}
func (*emptyReader) Read([]byte) (int, error) {
return 0, io.EOF
}
|
