forked from calavera/docker-volume-vault
/
fs.go
156 lines (135 loc) · 3.71 KB
/
fs.go
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
package fs
import (
"fmt"
"log"
"strings"
"github.com/hanwen/go-fuse/fuse"
"github.com/hanwen/go-fuse/fuse/nodefs"
"github.com/hanwen/go-fuse/fuse/pathfs"
"github.com/hashicorp/vault/api"
"golang.org/x/sys/unix"
)
const (
EISDIR = fuse.Status(unix.EISDIR)
)
type fs struct {
pathfs.FileSystem
client *api.Client
}
// NewKeywhizFs readies a KeywhizFs struct and its parent filesystem objects.
func NewFs(client *api.Client) (*fs, nodefs.Node) {
defaultfs := pathfs.NewDefaultFileSystem() // Returns ENOSYS by default
readonlyfs := pathfs.NewReadonlyFileSystem(defaultfs) // R/W calls return EPERM
kwfs := &fs{readonlyfs, client}
nfs := pathfs.NewPathNodeFs(kwfs, nil)
nfs.SetDebug(true)
return kwfs, nfs.Root()
}
// GetAttr is a FUSE function which tells FUSE which files and directories exist.
func (f *fs) GetAttr(name string, context *fuse.Context) (*fuse.Attr, fuse.Status) {
log.Printf("GetAttr '%s'\n", name)
var attr *fuse.Attr
switch {
case name == "": // Base directory
m, err := f.client.Sys().ListMounts()
if err != nil {
log.Println(err)
attr = f.directoryAttr(1, 0755)
}
attr = f.directoryAttr(len(m), 0755)
case name == "secret":
attr = f.directoryAttr(1, 0755)
case name == "sys":
attr = f.directoryAttr(1, 0755)
case strings.HasPrefix(name, "secret/"):
s, err := f.client.Logical().Read(name)
if err != nil {
log.Println(err)
return nil, fuse.ENOENT
}
fmt.Println(name, ":", s)
if s == nil || s.Data == nil {
attr = f.directoryAttr(1, 0755)
} else {
fmt.Println(s.Data["value"])
if value, ok := s.Data["value"]; ok {
attr = f.secretAttr(value.(string) + "\n")
}
}
}
if attr != nil {
return attr, fuse.OK
}
return nil, fuse.ENOENT
}
// Open is a FUSE function where an in-memory open file struct is constructed.
func (f *fs) Open(name string, flags uint32, context *fuse.Context) (nodefs.File, fuse.Status) {
log.Printf("Open '%s'\n", name)
var file nodefs.File
switch {
case name == "":
return nil, EISDIR
case name == "secret" || name == "sys":
return nil, EISDIR
case strings.HasPrefix(name, "secret/"):
fmt.Println("got here")
s, err := f.client.Logical().Read(name)
if err != nil {
log.Println(err)
return nil, fuse.ENOENT
}
if s == nil || s.Data == nil {
return nil, fuse.ENOENT
}
file = nodefs.NewDataFile([]byte(s.Data["value"].(string) + "\n"))
}
if file != nil {
file = nodefs.NewReadOnlyFile(file)
return file, fuse.OK
}
return nil, fuse.ENOENT
}
// OpenDir is a FUSE function called when performing a directory listing.
func (f *fs) OpenDir(name string, context *fuse.Context) ([]fuse.DirEntry, fuse.Status) {
log.Printf("OpenDir '%s'\n", name)
var entries []fuse.DirEntry
if name == "" {
mounts, err := f.client.Sys().ListMounts()
if err != nil {
log.Println(err)
return entries, fuse.OK
}
if len(mounts) == 0 {
return entries, fuse.OK
}
entries = make([]fuse.DirEntry, 0, len(mounts))
for name, _ := range mounts {
entries = append(entries, fuse.DirEntry{
Mode: unix.S_IFDIR,
Name: strings.TrimSuffix(name, "/"),
})
}
}
return entries, fuse.OK
}
// Unlink is a FUSE function called when an object is deleted.
func (f *fs) Unlink(name string, context *fuse.Context) fuse.Status {
return fuse.EACCES
}
// secretAttr constructs a fuse.Attr based on a given Secret.
func (f *fs) secretAttr(s string) *fuse.Attr {
size := uint64(len(s))
attr := &fuse.Attr{
Size: size,
Mode: 0444 | unix.S_IFREG,
}
return attr
}
// directoryAttr constructs a generic directory fuse.Attr with the given parameters.
func (f *fs) directoryAttr(subdirCount int, mode uint32) *fuse.Attr {
attr := &fuse.Attr{
Size: uint64(subdirCount),
Mode: fuse.S_IFDIR | mode,
}
return attr
}