/
cmd-diff.go
187 lines (172 loc) · 5.1 KB
/
cmd-diff.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
/*
* 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 main
import (
"fmt"
"github.com/minio/cli"
"github.com/minio/mc/pkg/console"
"github.com/minio/minio/pkg/iodine"
)
// Help message.
var diffCmd = cli.Command{
Name: "diff",
Usage: "Compute differences between two files or folders",
Description: "NOTE: This command *DOES NOT* check for content similarity, which means objects with same size, but different content will not be spotted",
Action: runDiffCmd,
CustomHelpTemplate: `NAME:
mc {{.Name}} - {{.Usage}}
USAGE:
mc {{.Name}} FIRST SECOND {{if .Description}}
DESCRIPTION:
{{.Description}}{{end}}{{if .Flags}}
FLAGS:
{{range .Flags}}{{.}}
{{end}}{{ end }}
EXAMPLES:
1. Compare foo.ogg on a local filesystem with bar.ogg on Amazon AWS cloud storage.
$ mc {{.Name}} foo.ogg https://s3.amazonaws.com/jukebox/bar.ogg
2. Compare two different directories on a local filesystem.
$ mc {{.Name}} ~/Photos /Media/Backup/Photos
`,
}
// runDiffCmd - is a handler for mc diff command
func runDiffCmd(ctx *cli.Context) {
if len(ctx.Args()) != 2 || ctx.Args().First() == "help" {
cli.ShowCommandHelpAndExit(ctx, "diff", 1) // last argument is exit code
}
if !isMcConfigExists() {
console.Fatals(ErrorMessage{
Message: "Please run \"mc config generate\"",
Error: iodine.New(errNotConfigured{}, nil),
})
}
config, err := getMcConfig()
if err != nil {
console.Fatals(ErrorMessage{
Message: fmt.Sprintf("Unable to read config file ‘%s’", mustGetMcConfigPath()),
Error: iodine.New(err, nil),
})
}
firstURL := ctx.Args().First()
secondURL := ctx.Args()[1]
firstURL, err = getExpandedURL(firstURL, config.Aliases)
if err != nil {
switch iodine.ToError(err).(type) {
case errUnsupportedScheme:
console.Fatals(ErrorMessage{
Message: fmt.Sprintf("Unknown type of URL ‘%s’", firstURL),
Error: iodine.New(err, nil),
})
default:
console.Fatals(ErrorMessage{
Message: fmt.Sprintf("Unable to parse argument ‘%s’", firstURL),
Error: iodine.New(err, nil),
})
}
}
secondURL, err = getExpandedURL(secondURL, config.Aliases)
if err != nil {
switch iodine.ToError(err).(type) {
case errUnsupportedScheme:
console.Fatals(ErrorMessage{
Message: fmt.Sprintf("Unknown type of URL ‘%s’", secondURL),
Error: iodine.New(err, nil),
})
default:
console.Fatals(ErrorMessage{
Message: fmt.Sprintf("Unable to parse argument ‘%s’", secondURL),
Error: iodine.New(err, nil),
})
}
}
if isURLRecursive(secondURL) {
console.Fatals(ErrorMessage{
Message: "Second URL cannot be recursive, diff command is unidirectional",
Error: iodine.New(errInvalidArgument{}, nil),
})
}
newFirstURL := stripRecursiveURL(firstURL)
for diff := range doDiffCmd(newFirstURL, secondURL, isURLRecursive(firstURL)) {
if diff.err != nil {
console.Fatals(ErrorMessage{
Message: diff.message,
Error: iodine.New(diff.err, nil),
})
}
console.Infos(InfoMessage{
Message: diff.message,
})
}
}
func doDiffInRoutine(firstURL, secondURL string, recursive bool, ch chan diff) {
defer close(ch)
_, firstContent, err := url2Stat(firstURL)
if err != nil {
ch <- diff{
message: "Failed to stat ‘" + firstURL + "’",
err: iodine.New(err, nil),
}
return
}
_, secondContent, err := url2Stat(secondURL)
if err != nil {
ch <- diff{
message: "Failed to stat ‘" + secondURL + "’",
err: iodine.New(err, nil),
}
return
}
if firstContent.Type.IsRegular() {
switch {
case secondContent.Type.IsDir():
newSecondURL, err := urlJoinPath(secondURL, firstURL)
if err != nil {
ch <- diff{
message: "Unable to construct new URL from ‘" + secondURL + "’ using ‘" + firstURL,
err: iodine.New(err, nil),
}
return
}
doDiffObjects(firstURL, newSecondURL, ch)
case !secondContent.Type.IsRegular():
ch <- diff{
message: "‘" + firstURL + "’ and " + "‘" + secondURL + "’ differs in type.",
err: nil,
}
return
case secondContent.Type.IsRegular():
doDiffObjects(firstURL, secondURL, ch)
}
}
if firstContent.Type.IsDir() {
switch {
case !secondContent.Type.IsDir():
ch <- diff{
message: "‘" + firstURL + "’ and " + "‘" + secondURL + "’ differs in type.",
err: nil,
}
return
default:
doDiffDirs(firstURL, secondURL, recursive, ch)
}
}
}
// doDiffCmd - Execute the diff command
func doDiffCmd(firstURL, secondURL string, recursive bool) <-chan diff {
ch := make(chan diff)
go doDiffInRoutine(firstURL, secondURL, recursive, ch)
return ch
}