Repository navigation
Expand file tree
/
Copy pathmetadata.go
More file actions
172 lines (161 loc) · 4.25 KB
/
Copy pathmetadata.go
File metadata and controls
172 lines (161 loc) · 4.25 KB
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
package fs
import (
"bytes"
"context"
"encoding/json"
"fmt"
"os/exec"
"strings"
"time"
)
// Metadata represents Object metadata in a standardised form
//
// See docs/content/metadata.md for the interpretation of the keys
type Metadata map[string]string
// MetadataHelp represents help for a bit of system metadata
type MetadataHelp struct {
Help string
Type string
Example string
ReadOnly bool
}
// MetadataInfo is help for the whole metadata for this backend.
type MetadataInfo struct {
System map[string]MetadataHelp
Help string
}
// Set k to v on m
//
// If m is nil, then it will get made
func (m *Metadata) Set(k, v string) {
if *m == nil {
*m = make(Metadata, 1)
}
(*m)[k] = v
}
// Merge other into m
//
// If m is nil, then it will get made
func (m *Metadata) Merge(other Metadata) {
for k, v := range other {
if *m == nil {
*m = make(Metadata, len(other))
}
(*m)[k] = v
}
}
// MergeOptions gets any Metadata from the options passed in and
// stores it in m (which may be nil).
//
// If there is no m then metadata will be nil
func (m *Metadata) MergeOptions(options []OpenOption) {
for _, opt := range options {
if metadataOption, ok := opt.(MetadataOption); ok {
m.Merge(Metadata(metadataOption))
}
}
}
// GetMetadata from an DirEntry
//
// If the object has no metadata then metadata will be nil
func GetMetadata(ctx context.Context, o DirEntry) (metadata Metadata, err error) {
do, ok := o.(Metadataer)
if !ok {
return nil, nil
}
return do.Metadata(ctx)
}
// mapItem descripts the item to be mapped
type mapItem struct {
SrcFs string
SrcFsType string
DstFs string
DstFsType string
Remote string
Size int64
MimeType string `json:",omitempty"`
ModTime time.Time
IsDir bool
ID string `json:",omitempty"`
Metadata Metadata `json:",omitempty"`
}
// This runs an external program on the metadata which can be used to
// map it from one form to another.
func metadataMapper(ctx context.Context, cmdLine SpaceSepList, dstFs Fs, o DirEntry, metadata Metadata) (newMetadata Metadata, err error) {
ci := GetConfig(ctx)
cmd := exec.Command(cmdLine[0], cmdLine[1:]...)
in := mapItem{
DstFs: ConfigString(dstFs),
DstFsType: Type(dstFs),
Remote: o.Remote(),
Size: o.Size(),
MimeType: MimeType(ctx, o),
ModTime: o.ModTime(ctx),
IsDir: false,
Metadata: metadata,
}
fInfo := o.Fs()
if f, ok := fInfo.(Fs); ok {
in.SrcFs = ConfigString(f)
in.SrcFsType = Type(f)
} else {
in.SrcFs = fInfo.Name() + ":" + fInfo.Root()
in.SrcFsType = "unknown"
}
if do, ok := o.(IDer); ok {
in.ID = do.ID()
}
inBytes, err := json.MarshalIndent(in, "", "\t")
if err != nil {
return nil, fmt.Errorf("metadata mapper: failed to marshal input: %w", err)
}
if ci.Dump.IsSet(DumpMapper) {
Debugf(nil, "Metadata mapper sent: \n%s\n", string(inBytes))
}
var stdout, stderr bytes.Buffer
cmd.Stdin = bytes.NewBuffer(inBytes)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
start := time.Now()
err = cmd.Run()
Debugf(o, "Calling metadata mapper %v", cmdLine)
duration := time.Since(start)
if err != nil {
return nil, fmt.Errorf("metadata mapper: failed on %v: %q: %w", cmdLine, strings.TrimSpace(stderr.String()), err)
}
if ci.Dump.IsSet(DumpMapper) {
Debugf(nil, "Metadata mapper received: \n%s\n", stdout.String())
}
var out mapItem
err = json.Unmarshal(stdout.Bytes(), &out)
if err != nil {
return nil, fmt.Errorf("metadata mapper: failed to read output: %q: %w", stdout.String(), err)
}
Debugf(o, "Metadata mapper returned in %v", duration)
return out.Metadata, nil
}
// GetMetadataOptions from an DirEntry and merge it with any in options
//
// If --metadata isn't in use it will return nil.
//
// If the object has no metadata then metadata will be nil.
//
// This should be passed the destination Fs for the metadata mapper
func GetMetadataOptions(ctx context.Context, dstFs Fs, o DirEntry, options []OpenOption) (metadata Metadata, err error) {
ci := GetConfig(ctx)
if !ci.Metadata {
return nil, nil
}
metadata, err = GetMetadata(ctx, o)
if err != nil {
return nil, err
}
metadata.MergeOptions(options)
if len(ci.MetadataMapper) != 0 {
metadata, err = metadataMapper(ctx, ci.MetadataMapper, dstFs, o, metadata)
if err != nil {
return nil, err
}
}
return metadata, nil
}