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Date:: Mon Nov 5 10:46:30 2018 UTC
Message:: add a mini-commit object for use by commit graph
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1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/socket.h>
22 #include <sys/syslimits.h>
23 #include <sys/wait.h>
24 
25 #include <errno.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <stdint.h>
30 #include <sha1.h>
31 #include <zlib.h>
32 #include <ctype.h>
33 #include <limits.h>
34 #include <imsg.h>
35 #include <time.h>
36 #include <unistd.h>
37 
38 #include "got_error.h"
39 #include "got_object.h"
40 #include "got_repository.h"
41 #include "got_opentemp.h"
42 
43 #include "got_lib_sha1.h"
44 #include "got_lib_delta.h"
45 #include "got_lib_inflate.h"
46 #include "got_lib_object.h"
47 #include "got_lib_privsep.h"
48 #include "got_lib_pack.h"
49 #include "got_lib_object_cache.h"
50 #include "got_lib_repository.h"
51 
52 #ifndef nitems
53 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
54 #endif
55 
56 #define GOT_OBJ_TAG_COMMIT	"commit"
57 #define GOT_OBJ_TAG_TREE	"tree"
58 #define GOT_OBJ_TAG_BLOB	"blob"
59 
60 #define GOT_COMMIT_TAG_TREE		"tree "
61 #define GOT_COMMIT_TAG_PARENT		"parent "
62 #define GOT_COMMIT_TAG_AUTHOR		"author "
63 #define GOT_COMMIT_TAG_COMMITTER	"committer "
64 
65 const struct got_error *
66 got_object_id_str(char **outbuf, struct got_object_id *id)
67 {
68 	static const size_t len = SHA1_DIGEST_STRING_LENGTH;
69 
70 	*outbuf = malloc(len);
71 	if (*outbuf == NULL)
72 		return got_error_from_errno();
73 
74 	if (got_sha1_digest_to_str(id->sha1, *outbuf, len) == NULL) {
75 		free(*outbuf);
76 		*outbuf = NULL;
77 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
78 	}
79 
80 	return NULL;
81 }
82 
83 void
84 got_object_close(struct got_object *obj)
85 {
86 	if (obj->refcnt > 0) {
87 		obj->refcnt--;
88 		if (obj->refcnt > 0)
89 			return;
90 	}
91 
92 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
93 		struct got_delta *delta;
94 		while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
95 			delta = SIMPLEQ_FIRST(&obj->deltas.entries);
96 			SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
97 			got_delta_close(delta);
98 		}
99 	}
100 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
101 		free(obj->path_packfile);
102 	free(obj);
103 }
104 
105 const struct got_error *
106 got_object_qid_alloc_partial(struct got_object_qid **qid)
107 {
108 	const struct got_error *err = NULL;
109 
110 	*qid = malloc(sizeof(**qid));
111 	if (*qid == NULL)
112 		return got_error_from_errno();
113 
114 	(*qid)->id = malloc(sizeof(*((*qid)->id)));
115 	if ((*qid)->id == NULL) {
116 		err = got_error_from_errno();
117 		got_object_qid_free(*qid);
118 		*qid = NULL;
119 	}
120 	return err;
121 }
122 
123 void
124 got_object_qid_free(struct got_object_qid *qid)
125 {
126 	free(qid->id);
127 	free(qid);
128 }
129 
130 struct got_commit_object *
131 got_object_commit_alloc_partial(void)
132 {
133 	struct got_commit_object *commit;
134 
135 	commit = calloc(1, sizeof(*commit));
136 	if (commit == NULL)
137 		return NULL;
138 	commit->tree_id = calloc(1, sizeof(*commit->tree_id));
139 	if (commit->tree_id == NULL) {
140 		free(commit);
141 		return NULL;
142 	}
143 
144 	SIMPLEQ_INIT(&commit->parent_ids);
145 
146 	return commit;
147 }
148 
149 struct got_commit_object_mini *
150 got_object_mini_commit_alloc_partial(void)
151 {
152 	struct got_commit_object_mini *commit;
153 
154 	commit = calloc(1, sizeof(*commit));
155 	if (commit == NULL)
156 		return NULL;
157 	commit->tree_id = calloc(1, sizeof(*commit->tree_id));
158 	if (commit->tree_id == NULL) {
159 		free(commit);
160 		return NULL;
161 	}
162 
163 	SIMPLEQ_INIT(&commit->parent_ids);
164 
165 	return commit;
166 }
167 
168 const struct got_error *
169 got_object_commit_add_parent(struct got_commit_object *commit,
170     const char *id_str)
171 {
172 	const struct got_error *err = NULL;
173 	struct got_object_qid *qid;
174 
175 	err = got_object_qid_alloc_partial(&qid);
176 	if (err)
177 		return err;
178 
179 	if (!got_parse_sha1_digest(qid->id->sha1, id_str)) {
180 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
181 		free(qid->id);
182 		free(qid);
183 		return err;
184 	}
185 
186 	SIMPLEQ_INSERT_TAIL(&commit->parent_ids, qid, entry);
187 	commit->nparents++;
188 
189 	return NULL;
190 }
191 
192 const struct got_error *
193 got_object_mini_commit_add_parent(struct got_commit_object_mini *commit,
194     const char *id_str)
195 {
196 	const struct got_error *err = NULL;
197 	struct got_object_qid *qid;
198 
199 	err = got_object_qid_alloc_partial(&qid);
200 	if (err)
201 		return err;
202 
203 	if (!got_parse_sha1_digest(qid->id->sha1, id_str)) {
204 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
205 		free(qid->id);
206 		free(qid);
207 		return err;
208 	}
209 
210 	SIMPLEQ_INSERT_TAIL(&commit->parent_ids, qid, entry);
211 	commit->nparents++;
212 
213 	return NULL;
214 }
215 
216 static const struct got_error *
217 parse_gmtoff(time_t *gmtoff, const char *tzstr)
218 {
219 	int sign = 1;
220 	const char *p = tzstr;
221 	time_t h, m;
222 
223 	*gmtoff = 0;
224 
225 	if (*p == '-')
226 		sign = -1;
227 	else if (*p != '+')
228 		return got_error(GOT_ERR_BAD_OBJ_DATA);
229 	p++;
230 	if (!isdigit(*p) && !isdigit(*(p + 1)))
231 		return got_error(GOT_ERR_BAD_OBJ_DATA);
232 	h = (((*p - '0') * 10) + (*(p + 1) - '0'));
233 
234 	p += 2;
235 	if (!isdigit(*p) && !isdigit(*(p + 1)))
236 		return got_error(GOT_ERR_BAD_OBJ_DATA);
237 	m = ((*p - '0') * 10) + (*(p + 1) - '0');
238 
239 	*gmtoff = (h * 60 * 60 + m * 60) * sign;
240 	return NULL;
241 }
242 
243 static const struct got_error *
244 parse_commit_time(struct tm *tm, char *committer)
245 {
246 	const struct got_error *err = NULL;
247 	const char *errstr;
248 	char *space, *tzstr;
249 	time_t gmtoff;
250 	time_t time;
251 
252 	/* Parse and strip off trailing timezone indicator string. */
253 	space = strrchr(committer, ' ');
254 	if (space == NULL)
255 		return got_error(GOT_ERR_BAD_OBJ_DATA);
256 	tzstr = strdup(space + 1);
257 	if (tzstr == NULL)
258 		return got_error_from_errno();
259 	err = parse_gmtoff(&gmtoff, tzstr);
260 	free(tzstr);
261 	if (err)
262 		return err;
263 	*space = '\0';
264 
265 	/* Timestamp is separated from committer name + email by space. */
266 	space = strrchr(committer, ' ');
267 	if (space == NULL)
268 		return got_error(GOT_ERR_BAD_OBJ_DATA);
269 
270 	/* Timestamp parsed here is expressed in comitter's local time. */
271 	time = strtonum(space + 1, 0, INT64_MAX, &errstr);
272 	if (errstr)
273 		return got_error(GOT_ERR_BAD_OBJ_DATA);
274 
275 	/* Express the time stamp in UTC. */
276 	memset(tm, 0, sizeof(*tm));
277 	time -= gmtoff;
278 	if (localtime_r(&time, tm) == NULL)
279 		return got_error_from_errno();
280 	tm->tm_gmtoff = gmtoff;
281 
282 	/* Strip off parsed time information, leaving just author and email. */
283 	*space = '\0';
284 
285 	return NULL;
286 }
287 
288 void
289 got_object_commit_close(struct got_commit_object *commit)
290 {
291 	struct got_object_qid *qid;
292 
293 	if (commit->refcnt > 0) {
294 		commit->refcnt--;
295 		if (commit->refcnt > 0)
296 			return;
297 	}
298 
299 	while (!SIMPLEQ_EMPTY(&commit->parent_ids)) {
300 		qid = SIMPLEQ_FIRST(&commit->parent_ids);
301 		SIMPLEQ_REMOVE_HEAD(&commit->parent_ids, entry);
302 		got_object_qid_free(qid);
303 	}
304 
305 	free(commit->tree_id);
306 	free(commit->author);
307 	free(commit->committer);
308 	free(commit->logmsg);
309 	free(commit);
310 }
311 
312 void
313 got_object_mini_commit_close(struct got_commit_object_mini *commit)
314 {
315 	struct got_object_qid *qid;
316 
317 	while (!SIMPLEQ_EMPTY(&commit->parent_ids)) {
318 		qid = SIMPLEQ_FIRST(&commit->parent_ids);
319 		SIMPLEQ_REMOVE_HEAD(&commit->parent_ids, entry);
320 		got_object_qid_free(qid);
321 	}
322 
323 	free(commit->tree_id);
324 	free(commit);
325 }
326 
327 const struct got_error *
328 got_object_parse_commit(struct got_commit_object **commit, char *buf,
329     size_t len)
330 {
331 	const struct got_error *err = NULL;
332 	char *s = buf;
333 	size_t tlen;
334 	ssize_t remain = (ssize_t)len;
335 
336 	*commit = got_object_commit_alloc_partial();
337 	if (*commit == NULL)
338 		return got_error_from_errno();
339 
340 	tlen = strlen(GOT_COMMIT_TAG_TREE);
341 	if (strncmp(s, GOT_COMMIT_TAG_TREE, tlen) == 0) {
342 		remain -= tlen;
343 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
344 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
345 			goto done;
346 		}
347 		s += tlen;
348 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
349 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
350 			goto done;
351 		}
352 		remain -= SHA1_DIGEST_STRING_LENGTH;
353 		s += SHA1_DIGEST_STRING_LENGTH;
354 	} else {
355 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
356 		goto done;
357 	}
358 
359 	tlen = strlen(GOT_COMMIT_TAG_PARENT);
360 	while (strncmp(s, GOT_COMMIT_TAG_PARENT, tlen) == 0) {
361 		remain -= tlen;
362 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
363 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
364 			goto done;
365 		}
366 		s += tlen;
367 		err = got_object_commit_add_parent(*commit, s);
368 		if (err)
369 			goto done;
370 
371 		remain -= SHA1_DIGEST_STRING_LENGTH;
372 		s += SHA1_DIGEST_STRING_LENGTH;
373 	}
374 
375 	tlen = strlen(GOT_COMMIT_TAG_AUTHOR);
376 	if (strncmp(s, GOT_COMMIT_TAG_AUTHOR, tlen) == 0) {
377 		char *p;
378 		size_t slen;
379 
380 		remain -= tlen;
381 		if (remain <= 0) {
382 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
383 			goto done;
384 		}
385 		s += tlen;
386 		p = strchr(s, '\n');
387 		if (p == NULL) {
388 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
389 			goto done;
390 		}
391 		*p = '\0';
392 		slen = strlen(s);
393 		err = parse_commit_time(&(*commit)->tm_author, s);
394 		if (err)
395 			goto done;
396 		(*commit)->author = strdup(s);
397 		if ((*commit)->author == NULL) {
398 			err = got_error_from_errno();
399 			goto done;
400 		}
401 		s += slen + 1;
402 		remain -= slen + 1;
403 	}
404 
405 	tlen = strlen(GOT_COMMIT_TAG_COMMITTER);
406 	if (strncmp(s, GOT_COMMIT_TAG_COMMITTER, tlen) == 0) {
407 		char *p;
408 		size_t slen;
409 
410 		remain -= tlen;
411 		if (remain <= 0) {
412 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
413 			goto done;
414 		}
415 		s += tlen;
416 		p = strchr(s, '\n');
417 		if (p == NULL) {
418 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
419 			goto done;
420 		}
421 		*p = '\0';
422 		slen = strlen(s);
423 		err = parse_commit_time(&(*commit)->tm_committer, s);
424 		if (err)
425 			goto done;
426 		(*commit)->committer = strdup(s);
427 		if ((*commit)->committer == NULL) {
428 			err = got_error_from_errno();
429 			goto done;
430 		}
431 		s += slen + 1;
432 		remain -= slen + 1;
433 	}
434 
435 	(*commit)->logmsg = strndup(s, remain);
436 	if ((*commit)->logmsg == NULL) {
437 		err = got_error_from_errno();
438 		goto done;
439 	}
440 done:
441 	if (err) {
442 		got_object_commit_close(*commit);
443 		*commit = NULL;
444 	}
445 	return err;
446 }
447 
448 const struct got_error *
449 got_object_parse_mini_commit(struct got_commit_object_mini **commit, char *buf,
450     size_t len)
451 {
452 	const struct got_error *err = NULL;
453 	char *s = buf;
454 	size_t tlen;
455 	ssize_t remain = (ssize_t)len;
456 
457 	*commit = got_object_mini_commit_alloc_partial();
458 	if (*commit == NULL)
459 		return got_error_from_errno();
460 
461 	tlen = strlen(GOT_COMMIT_TAG_TREE);
462 	if (strncmp(s, GOT_COMMIT_TAG_TREE, tlen) == 0) {
463 		remain -= tlen;
464 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
465 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
466 			goto done;
467 		}
468 		s += tlen;
469 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
470 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
471 			goto done;
472 		}
473 		remain -= SHA1_DIGEST_STRING_LENGTH;
474 		s += SHA1_DIGEST_STRING_LENGTH;
475 	} else {
476 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
477 		goto done;
478 	}
479 
480 	tlen = strlen(GOT_COMMIT_TAG_PARENT);
481 	while (strncmp(s, GOT_COMMIT_TAG_PARENT, tlen) == 0) {
482 		remain -= tlen;
483 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
484 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
485 			goto done;
486 		}
487 		s += tlen;
488 		err = got_object_mini_commit_add_parent(*commit, s);
489 		if (err)
490 			goto done;
491 
492 		remain -= SHA1_DIGEST_STRING_LENGTH;
493 		s += SHA1_DIGEST_STRING_LENGTH;
494 	}
495 
496 	tlen = strlen(GOT_COMMIT_TAG_AUTHOR);
497 	if (strncmp(s, GOT_COMMIT_TAG_AUTHOR, tlen) == 0) {
498 		char *p;
499 		size_t slen;
500 
501 		remain -= tlen;
502 		if (remain <= 0) {
503 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
504 			goto done;
505 		}
506 		s += tlen;
507 		p = strchr(s, '\n');
508 		if (p == NULL) {
509 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
510 			goto done;
511 		}
512 		*p = '\0';
513 		slen = strlen(s);
514 		s += slen + 1;
515 		remain -= slen + 1;
516 	}
517 
518 	tlen = strlen(GOT_COMMIT_TAG_COMMITTER);
519 	if (strncmp(s, GOT_COMMIT_TAG_COMMITTER, tlen) == 0) {
520 		char *p;
521 		size_t slen;
522 
523 		remain -= tlen;
524 		if (remain <= 0) {
525 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
526 			goto done;
527 		}
528 		s += tlen;
529 		p = strchr(s, '\n');
530 		if (p == NULL) {
531 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
532 			goto done;
533 		}
534 		*p = '\0';
535 		slen = strlen(s);
536 		err = parse_commit_time(&(*commit)->tm_committer, s);
537 		if (err)
538 			goto done;
539 		s += slen + 1;
540 		remain -= slen + 1;
541 	}
542 
543 done:
544 	if (err) {
545 		got_object_mini_commit_close(*commit);
546 		*commit = NULL;
547 	}
548 	return err;
549 }
550 
551 void
552 got_object_tree_entry_close(struct got_tree_entry *te)
553 {
554 	free(te->id);
555 	free(te->name);
556 	free(te);
557 }
558 
559 void
560 got_object_tree_close(struct got_tree_object *tree)
561 {
562 	struct got_tree_entry *te;
563 
564 	if (tree->refcnt > 0) {
565 		tree->refcnt--;
566 		if (tree->refcnt > 0)
567 			return;
568 	}
569 
570 	while (!SIMPLEQ_EMPTY(&tree->entries.head)) {
571 		te = SIMPLEQ_FIRST(&tree->entries.head);
572 		SIMPLEQ_REMOVE_HEAD(&tree->entries.head, entry);
573 		got_object_tree_entry_close(te);
574 	}
575 
576 	free(tree);
577 }
578 
579 struct got_tree_entry *
580 got_alloc_tree_entry_partial(void)
581 {
582 	struct got_tree_entry *te;
583 
584 	te = calloc(1, sizeof(*te));
585 	if (te == NULL)
586 		return NULL;
587 
588 	te->id = calloc(1, sizeof(*te->id));
589 	if (te->id == NULL) {
590 		free(te);
591 		te = NULL;
592 	}
593 	return te;
594 }
595 
596 static const struct got_error *
597 parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
598     size_t maxlen)
599 {
600 	char *p = buf, *space;
601 	const struct got_error *err = NULL;
602 
603 	*te = got_alloc_tree_entry_partial();
604 	if (*te == NULL)
605 		return got_error_from_errno();
606 
607 	*elen = strlen(buf) + 1;
608 	if (*elen > maxlen) {
609 		free(*te);
610 		*te = NULL;
611 		return got_error(GOT_ERR_BAD_OBJ_DATA);
612 	}
613 
614 	space = strchr(buf, ' ');
615 	if (space == NULL) {
616 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
617 		free(*te);
618 		*te = NULL;
619 		return err;
620 	}
621 	while (*p != ' ') {
622 		if (*p < '0' && *p > '7') {
623 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
624 			goto done;
625 		}
626 		(*te)->mode <<= 3;
627 		(*te)->mode |= *p - '0';
628 		p++;
629 	}
630 
631 	(*te)->name = strdup(space + 1);
632 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
633 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
634 		goto done;
635 	}
636 	buf += strlen(buf) + 1;
637 	memcpy((*te)->id->sha1, buf, SHA1_DIGEST_LENGTH);
638 	*elen += SHA1_DIGEST_LENGTH;
639 done:
640 	if (err) {
641 		got_object_tree_entry_close(*te);
642 		*te = NULL;
643 	}
644 	return err;
645 }
646 
647 const struct got_error *
648 got_object_parse_tree(struct got_tree_object **tree, uint8_t *buf, size_t len)
649 {
650 	const struct got_error *err;
651 	size_t remain = len;
652 
653 	*tree = calloc(1, sizeof(**tree));
654 	if (*tree == NULL)
655 		return got_error_from_errno();
656 
657 	SIMPLEQ_INIT(&(*tree)->entries.head);
658 
659 	while (remain > 0) {
660 		struct got_tree_entry *te;
661 		size_t elen;
662 
663 		err = parse_tree_entry(&te, &elen, buf, remain);
664 		if (err)
665 			return err;
666 		(*tree)->entries.nentries++;
667 		SIMPLEQ_INSERT_TAIL(&(*tree)->entries.head, te, entry);
668 		buf += elen;
669 		remain -= elen;
670 	}
671 
672 	if (remain != 0) {
673 		got_object_tree_close(*tree);
674 		return got_error(GOT_ERR_BAD_OBJ_DATA);
675 	}
676 
677 	return NULL;
678 }
679 
680 const struct got_error *
681 got_read_file_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
682 {
683 	const struct got_error *err = NULL;
684 	static const size_t blocksize = 512;
685 	size_t n, total, remain;
686 	uint8_t *buf;
687 
688 	*outbuf = NULL;
689 	*outlen = 0;
690 
691 	buf = malloc(blocksize);
692 	if (buf == NULL)
693 		return got_error_from_errno();
694 
695 	remain = blocksize;
696 	total = 0;
697 	while (1) {
698 		if (remain == 0) {
699 			uint8_t *newbuf;
700 			newbuf = reallocarray(buf, 1, total + blocksize);
701 			if (newbuf == NULL) {
702 				err = got_error_from_errno();
703 				goto done;
704 			}
705 			buf = newbuf;
706 			remain += blocksize;
707 		}
708 		n = fread(buf + total, 1, remain, f);
709 		if (n == 0) {
710 			if (ferror(f)) {
711 				err = got_ferror(f, GOT_ERR_IO);
712 				goto done;
713 			}
714 			break; /* EOF */
715 		}
716 		remain -= n;
717 		total += n;
718 	};
719 
720 done:
721 	if (err == NULL) {
722 		*outbuf = buf;
723 		*outlen = total;
724 	} else
725 		free(buf);
726 	return err;
727 }