/
diff-main.go
212 lines (181 loc) · 6.29 KB
/
diff-main.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
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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
/*
* Minio Client (C) 2015 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"encoding/json"
"fmt"
"strings"
"github.com/fatih/color"
"github.com/minio/cli"
"github.com/didiyun/mc/pkg/probe"
"github.com/didiyun/mc/pkg/console"
)
// diff specific flags.
var (
diffFlags = []cli.Flag{}
)
// Compute differences in object name, size, and date between two buckets.
var diffCmd = cli.Command{
Name: "diff",
Usage: "list differences in object name, size, and date between two buckets",
Action: mainDiff,
Before: setGlobalsFromContext,
Flags: append(diffFlags, globalFlags...),
CustomHelpTemplate: `NAME:
{{.HelpName}} - {{.Usage}}
USAGE:
{{.HelpName}} [FLAGS] FIRST SECOND
FLAGS:
{{range .VisibleFlags}}{{.}}
{{end}}
DESCRIPTION:
Diff only calculates differences in object name, size and time.
It *DOES NOT* compare objects' contents.
LEGEND:
> - object is only in source.
< - object is only in destination.
! - newer object is in source.
EXAMPLES:
1. Compare a local folder with a folder on Amazon S3 cloud storage.
$ {{.HelpName}} ~/Photos s3/mybucket/Photos
2. Compare two folders on a local filesystem.
$ {{.HelpName}} ~/Photos /Media/Backup/Photos
`,
}
// diffMessage json container for diff messages
type diffMessage struct {
Status string `json:"status"`
FirstURL string `json:"first"`
SecondURL string `json:"second"`
Diff differType `json:"diff"`
Error *probe.Error `json:"error,omitempty"`
firstContent *clientContent
secondContent *clientContent
}
// String colorized diff message
func (d diffMessage) String() string {
msg := ""
switch d.Diff {
case differInFirst:
msg = console.Colorize("DiffOnlyInFirst", "< "+d.FirstURL)
case differInSecond:
msg = console.Colorize("DiffOnlyInSecond", "> "+d.SecondURL)
case differInType:
msg = console.Colorize("DiffType", "! "+d.SecondURL)
case differInSize:
msg = console.Colorize("DiffSize", "! "+d.SecondURL)
case differInTime:
msg = console.Colorize("DiffTime", "! "+d.SecondURL)
default:
fatalIf(errDummy().Trace(d.FirstURL, d.SecondURL),
"Unhandled difference between `"+d.FirstURL+"` and `"+d.SecondURL+"`.")
}
return msg
}
// JSON jsonified diff message
func (d diffMessage) JSON() string {
d.Status = "success"
diffJSONBytes, e := json.Marshal(d)
fatalIf(probe.NewError(e),
"Unable to marshal diff message `"+d.FirstURL+"`, `"+d.SecondURL+"` and `"+string(d.Diff)+"`.")
return string(diffJSONBytes)
}
func checkDiffSyntax(ctx *cli.Context, encKeyDB map[string][]prefixSSEPair) {
if len(ctx.Args()) != 2 {
cli.ShowCommandHelpAndExit(ctx, "diff", 1) // last argument is exit code
}
for _, arg := range ctx.Args() {
if strings.TrimSpace(arg) == "" {
fatalIf(errInvalidArgument().Trace(ctx.Args()...), "Unable to validate empty argument.")
}
}
URLs := ctx.Args()
firstURL := URLs[0]
secondURL := URLs[1]
// Diff only works between two directories, verify them below.
// Verify if firstURL is accessible.
_, firstContent, err := url2Stat(firstURL, false, encKeyDB)
if err != nil {
fatalIf(err.Trace(firstURL), fmt.Sprintf("Unable to stat '%s'.", firstURL))
}
// Verify if its a directory.
if !firstContent.Type.IsDir() {
fatalIf(errInvalidArgument().Trace(firstURL), fmt.Sprintf("`%s` is not a folder.", firstURL))
}
// Verify if secondURL is accessible.
_, secondContent, err := url2Stat(secondURL, false, encKeyDB)
if err != nil {
fatalIf(err.Trace(secondURL), fmt.Sprintf("Unable to stat '%s'.", secondURL))
}
// Verify if its a directory.
if !secondContent.Type.IsDir() {
fatalIf(errInvalidArgument().Trace(secondURL), fmt.Sprintf("`%s` is not a folder.", secondURL))
}
}
// doDiffMain runs the diff.
func doDiffMain(firstURL, secondURL string) error {
// Source and targets are always directories
sourceSeparator := string(newClientURL(firstURL).Separator)
if !strings.HasSuffix(firstURL, sourceSeparator) {
firstURL = firstURL + sourceSeparator
}
targetSeparator := string(newClientURL(secondURL).Separator)
if !strings.HasSuffix(secondURL, targetSeparator) {
secondURL = secondURL + targetSeparator
}
// Expand aliased urls.
firstAlias, firstURL, _ := mustExpandAlias(firstURL)
secondAlias, secondURL, _ := mustExpandAlias(secondURL)
firstClient, err := newClientFromAlias(firstAlias, firstURL)
if err != nil {
fatalIf(err.Trace(firstAlias, firstURL, secondAlias, secondURL),
fmt.Sprintf("Failed to diff '%s' and '%s'", firstURL, secondURL))
}
secondClient, err := newClientFromAlias(secondAlias, secondURL)
if err != nil {
fatalIf(err.Trace(firstAlias, firstURL, secondAlias, secondURL),
fmt.Sprintf("Failed to diff '%s' and '%s'", firstURL, secondURL))
}
// Diff first and second urls.
for diffMsg := range objectDifference(firstClient, secondClient, firstURL, secondURL) {
if diffMsg.Error != nil {
errorIf(diffMsg.Error, "Unable to calculate objects difference.")
// Ignore error and proceed to next object.
continue
}
printMsg(diffMsg)
}
return nil
}
// mainDiff main for 'diff'.
func mainDiff(ctx *cli.Context) error {
// Parse encryption keys per command.
encKeyDB, err := getEncKeys(ctx)
fatalIf(err, "Unable to parse encryption keys.")
// check 'diff' cli arguments.
checkDiffSyntax(ctx, encKeyDB)
// Additional command specific theme customization.
console.SetColor("DiffMessage", color.New(color.FgGreen, color.Bold))
console.SetColor("DiffOnlyInFirst", color.New(color.FgRed))
console.SetColor("DiffOnlyInSecond", color.New(color.FgGreen))
console.SetColor("DiffType", color.New(color.FgMagenta))
console.SetColor("DiffSize", color.New(color.FgYellow, color.Bold))
console.SetColor("DiffTime", color.New(color.FgYellow, color.Bold))
URLs := ctx.Args()
firstURL := URLs.Get(0)
secondURL := URLs.Get(1)
return doDiffMain(firstURL, secondURL)
}