-
Notifications
You must be signed in to change notification settings - Fork 0
/
commands.go
374 lines (325 loc) · 7.57 KB
/
commands.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
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
package main
import (
"errors"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
)
var (
DIFF = ""
CM_DIFF = ""
DIFFSTAT = ""
)
// Diff two files. If forceNormal is True, custom diffs configured in the
// the environ are ignored for the regular `diff` command.
func diff(src, dest string, forceNormal ...bool) (*exec.Cmd, error) {
var err error
if len(DIFF) == 0 {
CM_DIFF = os.Getenv("CM_DIFF")
DIFF, _ = exec.LookPath("diff")
if len(CM_DIFF) == 0 {
CM_DIFF, err = exec.LookPath("colordiff")
if err != nil {
CM_DIFF = DIFF
}
}
}
if len(CM_DIFF) == 0 {
return nil, errors.New("Could not find suitable diff executable in your PATH.")
}
if len(forceNormal) > 0 && forceNormal[0] {
return exec.Command(DIFF, "-Nu", src, dest), nil
}
return exec.Command(CM_DIFF, "-Nu", src, dest), nil
}
// Runs diffstat on some diff output. Returns diffstat command.
func diffstat(output string) (*exec.Cmd, error) {
var err error
var cmd *exec.Cmd
if len(DIFFSTAT) == 0 {
DIFFSTAT, _ = exec.LookPath("diffstat")
if len(DIFFSTAT) == 0 {
return nil, errors.New("Could not find suitable diffstat executable in your PATH.")
}
}
if runtime.GOOS == "darwin" {
cmd = exec.Command(DIFFSTAT)
} else {
cmd = exec.Command(DIFFSTAT, "-C")
}
if err != nil {
return nil, err
}
cmd.Stdin = strings.NewReader(output)
if err != nil {
return nil, err
}
return cmd, nil
}
// turn a path into a list of files. if the path denotes a file, the list
// contains only that file. if it contains a directory, a list of that
// directory is returned. all paths are absolute.
func pathToFiles(path string) ([]string, error) {
files := []string{}
if isFile(path) {
files = append(files, path)
} else {
stat, err := os.Stat(path)
if err != nil {
return files, err
}
if stat.IsDir() {
fileinfos, err := ioutil.ReadDir(path)
if err != nil {
return files, err
}
for _, fi := range fileinfos {
if !fi.IsDir() {
files = append(files, filepath.Join(path, fi.Name()))
} else {
more, err := pathToFiles(filepath.Join(path, fi.Name()))
if err == nil {
newf := make([]string, len(files)+len(more))
copy(newf, files)
copy(newf[len(files):], more)
files = newf
}
}
}
}
}
return files, nil
}
// implement the Add command, handling one path at a time. if the path is
// a directory, then copy all of the files over.
func Add(path string) error {
var cfg, dest string
files := []string{}
abs, err := filepath.Abs(path)
if err != nil {
return err
}
files, err = pathToFiles(abs)
if err != nil {
return err
}
for _, file := range files {
// strip out the CONFIG ROOT for the file; if it isn't inside the CONFIG_ROOT,
// then it isn't valid.
dest, err = StripRoot(file)
if err != nil {
return err
}
cfg = C(dest)
err = Copy(cfg, file)
if err != nil {
return err
}
fmt.Printf("%s -> %s\n", file, cfg)
}
return nil
}
// implement the `rm` command, handling one path at a time. the `rm` command
// will remove files from the overlay not present in the actual working
// filesystem.
func Rm(path string) error {
var err error
var abs, dest string
abs, err = filepath.Abs(path)
if err != nil {
return err
}
dest, err = StripRoot(abs)
if err != nil {
return err
}
path = C(dest)
err = os.RemoveAll(path)
if err == nil {
fmt.Printf("Removed %s\n", abs)
} else {
fmt.Fprintf(os.Stderr, "%s could not be removed: %s\n", abs, err.Error())
return err
}
return nil
}
// `list` command, handling one path at a time, shows what files exist under
// the overlay's version of the path
func List(path string) error {
var err error
var abs, dest string
abs, err = filepath.Abs(path)
if err != nil {
return err
}
dest, err = StripRoot(abs)
if err != nil {
return err
}
path = C(dest)
cfgs, err := pathToFiles(path)
if err != nil && !os.IsNotExist(err) {
fmt.Fprintf(os.Stderr, "Could not show %s: %s\n", path, err.Error())
} else if err != nil {
return nil
}
for _, cfg := range cfgs {
fmt.Println(X(cfg))
}
return nil
}
// `pull` command, copies file or directory from the overlay to the actual
// filesystem. will never delete files on filesystem, but always overwrites
// existing ones.
func Pull(path string) error {
var err error
var abs, dest, src string
abs, err = filepath.Abs(path)
if err != nil {
return err
}
dest, err = StripRoot(abs)
if err != nil {
return err
}
src = C(dest)
cfgs, err := pathToFiles(src)
if err != nil && os.IsNotExist(err) {
return nil
} else if err != nil {
fmt.Fprintf(os.Stderr, "Could not load files from %s: %s\n", src, err.Error())
return err
}
for _, cfg := range cfgs {
if !QuickDiff(cfg, X(cfg)) {
file := X(cfg)
err = Copy(file, cfg)
if err == nil {
fmt.Printf("%s -> %s\n", cfg, file)
} else {
fmt.Fprintf(os.Stderr, "%s could not be pulled: %s\n", file, err.Error())
}
}
}
return nil
}
// `push` command, copies a file or all files from the actual filesystem that
// exist in the overlay to the overlay.
func Push(path string) error {
var err error
var abs, dest, src string
abs, err = filepath.Abs(path)
if err != nil {
return err
}
dest, err = StripRoot(abs)
if err != nil {
return err
}
src = C(dest)
cfgs, err := pathToFiles(src)
if err != nil && os.IsNotExist(err) {
return nil
} else if err != nil {
return err
}
for _, cfg := range cfgs {
file := X(cfg)
if !QuickDiff(cfg, file) {
err = Copy(cfg, file)
if err != nil {
return err
}
fmt.Printf("%s -> %s\n", file, cfg)
}
}
return nil
}
// `diff` command, diffs two files or two directories of files using the system
// diff program with '-u'. this will only diff files which are present in the
// overlay, and the diff shows what would happen with a `pull`
func Diff(path string, reverse bool) error {
var cmd *exec.Cmd
var err error
var abs, dest, src string
abs, err = filepath.Abs(path)
if err != nil {
return err
}
dest, err = StripRoot(abs)
if err != nil {
return err
}
src = C(dest)
cfgs, err := pathToFiles(src)
if err != nil && os.IsNotExist(err) {
fmt.Fprintf(os.Stderr, "Requested file not found: %s: %s\n", src, err.Error())
} else if err != nil {
fmt.Fprintf(os.Stderr, "Could not diff files from %s: %s\n", src, err.Error())
return err
}
for _, cfg := range cfgs {
if !QuickDiff(cfg, X(cfg)) {
if reverse {
cmd, err = diff(X(cfg), cfg)
} else {
cmd, err = diff(cfg, X(cfg))
}
if err != nil {
return err
}
output, _ := cmd.Output()
fmt.Print(string(output))
}
}
return nil
}
// Show a diffstat style status for the path
func Status(path string, reverse bool) error {
var err error
var abs, dest, src string
var cmd *exec.Cmd
var diffout, output []byte
abs, err = filepath.Abs(path)
if err != nil {
return err
}
dest, err = StripRoot(abs)
if err != nil {
return err
}
src = C(dest)
cfgs, err := pathToFiles(src)
if err != nil && os.IsNotExist(err) {
fmt.Fprintf(os.Stderr, "Requested file not found: %s: %s\n", src, err.Error())
} else if err != nil {
fmt.Fprintf(os.Stderr, "Could not diff files from %s: %s\n", src, err.Error())
return err
}
diffout = make([]byte, 0, 4096)
for _, cfg := range cfgs {
if !QuickDiff(cfg, X(cfg)) {
if reverse {
cmd, err = diff(X(cfg), cfg, true)
} else {
cmd, err = diff(cfg, X(cfg), true)
}
if err != nil {
return err
}
output, _ = cmd.Output()
diffout = append(diffout, output...)
}
}
cmd, err = diffstat(string(diffout))
if err != nil {
return err
}
out, _ := cmd.Output()
fmt.Printf(string(out))
return nil
}