forked from src-d/go-git
-
Notifications
You must be signed in to change notification settings - Fork 0
/
commit.go
407 lines (339 loc) · 9.85 KB
/
commit.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
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
package object
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"strings"
"golang.org/x/crypto/openpgp"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/storer"
"gopkg.in/src-d/go-git.v4/utils/ioutil"
)
const (
beginpgp string = "-----BEGIN PGP SIGNATURE-----"
endpgp string = "-----END PGP SIGNATURE-----"
)
// Hash represents the hash of an object
type Hash plumbing.Hash
// Commit points to a single tree, marking it as what the project looked like
// at a certain point in time. It contains meta-information about that point
// in time, such as a timestamp, the author of the changes since the last
// commit, a pointer to the previous commit(s), etc.
// http://shafiulazam.com/gitbook/1_the_git_object_model.html
type Commit struct {
// Hash of the commit object.
Hash plumbing.Hash
// Author is the original author of the commit.
Author Signature
// Committer is the one performing the commit, might be different from
// Author.
Committer Signature
// PGPSignature is the PGP signature of the commit.
PGPSignature string
// Message is the commit message, contains arbitrary text.
Message string
// TreeHash is the hash of the root tree of the commit.
TreeHash plumbing.Hash
// ParentHashes are the hashes of the parent commits of the commit.
ParentHashes []plumbing.Hash
s storer.EncodedObjectStorer
}
// GetCommit gets a commit from an object storer and decodes it.
func GetCommit(s storer.EncodedObjectStorer, h plumbing.Hash) (*Commit, error) {
o, err := s.EncodedObject(plumbing.CommitObject, h)
if err != nil {
return nil, err
}
return DecodeCommit(s, o)
}
// DecodeCommit decodes an encoded object into a *Commit and associates it to
// the given object storer.
func DecodeCommit(s storer.EncodedObjectStorer, o plumbing.EncodedObject) (*Commit, error) {
c := &Commit{s: s}
if err := c.Decode(o); err != nil {
return nil, err
}
return c, nil
}
// Tree returns the Tree from the commit.
func (c *Commit) Tree() (*Tree, error) {
return GetTree(c.s, c.TreeHash)
}
// Patch returns the Patch between the actual commit and the provided one.
func (c *Commit) Patch(to *Commit) (*Patch, error) {
fromTree, err := c.Tree()
if err != nil {
return nil, err
}
toTree, err := to.Tree()
if err != nil {
return nil, err
}
return fromTree.Patch(toTree)
}
// Parents return a CommitIter to the parent Commits.
func (c *Commit) Parents() CommitIter {
return NewCommitIter(c.s,
storer.NewEncodedObjectLookupIter(c.s, plumbing.CommitObject, c.ParentHashes),
)
}
// NumParents returns the number of parents in a commit.
func (c *Commit) NumParents() int {
return len(c.ParentHashes)
}
var ErrParentNotFound = errors.New("commit parent not found")
// Parent returns the ith parent of a commit.
func (c *Commit) Parent(i int) (*Commit, error) {
if len(c.ParentHashes) == 0 || i > len(c.ParentHashes)-1 {
return nil, ErrParentNotFound
}
return GetCommit(c.s, c.ParentHashes[i])
}
// File returns the file with the specified "path" in the commit and a
// nil error if the file exists. If the file does not exist, it returns
// a nil file and the ErrFileNotFound error.
func (c *Commit) File(path string) (*File, error) {
tree, err := c.Tree()
if err != nil {
return nil, err
}
return tree.File(path)
}
// Files returns a FileIter allowing to iterate over the Tree
func (c *Commit) Files() (*FileIter, error) {
tree, err := c.Tree()
if err != nil {
return nil, err
}
return tree.Files(), nil
}
// ID returns the object ID of the commit. The returned value will always match
// the current value of Commit.Hash.
//
// ID is present to fulfill the Object interface.
func (c *Commit) ID() plumbing.Hash {
return c.Hash
}
// Type returns the type of object. It always returns plumbing.CommitObject.
//
// Type is present to fulfill the Object interface.
func (c *Commit) Type() plumbing.ObjectType {
return plumbing.CommitObject
}
// Decode transforms a plumbing.EncodedObject into a Commit struct.
func (c *Commit) Decode(o plumbing.EncodedObject) (err error) {
if o.Type() != plumbing.CommitObject {
return ErrUnsupportedObject
}
c.Hash = o.Hash()
reader, err := o.Reader()
if err != nil {
return err
}
defer ioutil.CheckClose(reader, &err)
r := bufio.NewReader(reader)
var message bool
var pgpsig bool
for {
line, err := r.ReadBytes('\n')
if err != nil && err != io.EOF {
return err
}
if pgpsig {
// Check if it's the end of a PGP signature.
if bytes.Contains(line, []byte(endpgp)) {
c.PGPSignature += endpgp + "\n"
pgpsig = false
} else {
// Trim the left padding.
line = bytes.TrimLeft(line, " ")
c.PGPSignature += string(line)
}
continue
}
// Check if it's the beginning of a PGP signature.
if bytes.Contains(line, []byte(beginpgp)) {
c.PGPSignature += beginpgp + "\n"
pgpsig = true
continue
}
if !message {
line = bytes.TrimSpace(line)
if len(line) == 0 {
message = true
continue
}
split := bytes.SplitN(line, []byte{' '}, 2)
switch string(split[0]) {
case "tree":
c.TreeHash = plumbing.NewHash(string(split[1]))
case "parent":
c.ParentHashes = append(c.ParentHashes, plumbing.NewHash(string(split[1])))
case "author":
c.Author.Decode(split[1])
case "committer":
c.Committer.Decode(split[1])
}
} else {
c.Message += string(line)
}
if err == io.EOF {
return nil
}
}
}
// Encode transforms a Commit into a plumbing.EncodedObject.
func (b *Commit) Encode(o plumbing.EncodedObject) error {
return b.encode(o, true)
}
func (b *Commit) encode(o plumbing.EncodedObject, includeSig bool) (err error) {
o.SetType(plumbing.CommitObject)
w, err := o.Writer()
if err != nil {
return err
}
defer ioutil.CheckClose(w, &err)
if _, err = fmt.Fprintf(w, "tree %s\n", b.TreeHash.String()); err != nil {
return err
}
for _, parent := range b.ParentHashes {
if _, err = fmt.Fprintf(w, "parent %s\n", parent.String()); err != nil {
return err
}
}
if _, err = fmt.Fprint(w, "author "); err != nil {
return err
}
if err = b.Author.Encode(w); err != nil {
return err
}
if _, err = fmt.Fprint(w, "\ncommitter "); err != nil {
return err
}
if err = b.Committer.Encode(w); err != nil {
return err
}
if b.PGPSignature != "" && includeSig {
if _, err = fmt.Fprint(w, "pgpsig"); err != nil {
return err
}
// Split all the signature lines and write with a left padding and
// newline at the end.
lines := strings.Split(b.PGPSignature, "\n")
for _, line := range lines {
if _, err = fmt.Fprintf(w, " %s\n", line); err != nil {
return err
}
}
}
if _, err = fmt.Fprintf(w, "\n\n%s", b.Message); err != nil {
return err
}
return err
}
// Stats shows the status of commit.
func (c *Commit) Stats() (FileStats, error) {
// Get the previous commit.
ci := c.Parents()
parentCommit, err := ci.Next()
if err != nil {
if err == io.EOF {
emptyNoder := treeNoder{}
parentCommit = &Commit{
Hash: emptyNoder.hash,
// TreeHash: emptyNoder.parent.Hash,
s: c.s,
}
} else {
return nil, err
}
}
patch, err := parentCommit.Patch(c)
if err != nil {
return nil, err
}
return getFileStatsFromFilePatches(patch.FilePatches()), nil
}
func (c *Commit) String() string {
return fmt.Sprintf(
"%s %s\nAuthor: %s\nDate: %s\n\n%s\n",
plumbing.CommitObject, c.Hash, c.Author.String(),
c.Author.When.Format(DateFormat), indent(c.Message),
)
}
// Verify performs PGP verification of the commit with a provided armored
// keyring and returns openpgp.Entity associated with verifying key on success.
func (c *Commit) Verify(armoredKeyRing string) (*openpgp.Entity, error) {
keyRingReader := strings.NewReader(armoredKeyRing)
keyring, err := openpgp.ReadArmoredKeyRing(keyRingReader)
if err != nil {
return nil, err
}
// Extract signature.
signature := strings.NewReader(c.PGPSignature)
encoded := &plumbing.MemoryObject{}
// Encode commit components, excluding signature and get a reader object.
if err := c.encode(encoded, false); err != nil {
return nil, err
}
er, err := encoded.Reader()
if err != nil {
return nil, err
}
return openpgp.CheckArmoredDetachedSignature(keyring, er, signature)
}
func indent(t string) string {
var output []string
for _, line := range strings.Split(t, "\n") {
if len(line) != 0 {
line = " " + line
}
output = append(output, line)
}
return strings.Join(output, "\n")
}
// CommitIter is a generic closable interface for iterating over commits.
type CommitIter interface {
Next() (*Commit, error)
ForEach(func(*Commit) error) error
Close()
}
// storerCommitIter provides an iterator from commits in an EncodedObjectStorer.
type storerCommitIter struct {
storer.EncodedObjectIter
s storer.EncodedObjectStorer
}
// NewCommitIter takes a storer.EncodedObjectStorer and a
// storer.EncodedObjectIter and returns a CommitIter that iterates over all
// commits contained in the storer.EncodedObjectIter.
//
// Any non-commit object returned by the storer.EncodedObjectIter is skipped.
func NewCommitIter(s storer.EncodedObjectStorer, iter storer.EncodedObjectIter) CommitIter {
return &storerCommitIter{iter, s}
}
// Next moves the iterator to the next commit and returns a pointer to it. If
// there are no more commits, it returns io.EOF.
func (iter *storerCommitIter) Next() (*Commit, error) {
obj, err := iter.EncodedObjectIter.Next()
if err != nil {
return nil, err
}
return DecodeCommit(iter.s, obj)
}
// ForEach call the cb function for each commit contained on this iter until
// an error appends or the end of the iter is reached. If ErrStop is sent
// the iteration is stopped but no error is returned. The iterator is closed.
func (iter *storerCommitIter) ForEach(cb func(*Commit) error) error {
return iter.EncodedObjectIter.ForEach(func(obj plumbing.EncodedObject) error {
c, err := DecodeCommit(iter.s, obj)
if err != nil {
return err
}
return cb(c)
})
}
func (iter *storerCommitIter) Close() {
iter.EncodedObjectIter.Close()
}