1 /*
2  * Copyright (c) 2020-2022 Tracey Emery <tracey@traceyemery.net>
3  * Copyright (c) 2018, 2019 Stefan Sperling <stsp@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/queue.h>
19 #include <sys/socket.h>
20 #include <sys/stat.h>
21 
22 #include <event.h>
23 #include <stdlib.h>
24 #include <stdio.h>
25 #include <string.h>
26 #include <unistd.h>
27 
28 #include "got_error.h"
29 #include "got_object.h"
30 #include "got_reference.h"
31 #include "got_repository.h"
32 #include "got_path.h"
33 #include "got_cancel.h"
34 #include "got_diff.h"
35 #include "got_commit_graph.h"
36 #include "got_blame.h"
37 #include "got_privsep.h"
38 
39 #include "got_compat.h"
40 
41 #include "proc.h"
42 #include "gotwebd.h"
43 
44 static const struct got_error *got_init_repo_commit(struct repo_commit **);
45 static const struct got_error *got_init_repo_tag(struct repo_tag **);
46 static const struct got_error *got_get_repo_commit(struct request *,
47     struct repo_commit *, struct got_commit_object *, struct got_reflist_head *,
48     struct got_object_id *);
49 static const struct got_error *got_gotweb_dupfd(int *, int *);
50 static const struct got_error *got_gotweb_openfile(FILE **, int *, int *);
51 static const struct got_error *got_gotweb_blame_cb(void *, int, int,
52     struct got_commit_object *,struct got_object_id *);
53 
54 const struct got_error *
55 got_gotweb_flushfile(FILE *f, int fd)
56 {
57 	if (fseek(f, 0, SEEK_SET) == -1)
58 		return got_error_from_errno("fseek");
59 
60 	if (ftruncate(fd, 0) == -1)
61 		return got_error_from_errno("ftruncate");
62 
63 	if (fsync(fd) == -1)
64 		return got_error_from_errno("fsync");
65 
66 	if (f && fclose(f) == EOF)
67 		return got_error_from_errno("fclose");
68 
69 	if (fd != -1 && close(fd) != -1)
70 		return got_error_from_errno("close");
71 
72 	return NULL;
73 }
74 
75 static const struct got_error *
76 got_gotweb_openfile(FILE **f, int *priv_fd, int *fd)
77 {
78 	*fd = dup(*priv_fd);
79 	if (*fd == -1)
80 		return got_error_from_errno("dup");
81 
82 	*f = fdopen(*fd, "w+");
83 	if (*f == NULL) {
84 		close(*fd);
85 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
86 	}
87 
88 	return NULL;
89 }
90 
91 static const struct got_error *
92 got_gotweb_dupfd(int *priv_fd, int *fd)
93 {
94 	*fd = dup(*priv_fd);
95 
96 	if (*fd < 0)
97 		return NULL;
98 
99 	return NULL;
100 }
101 
102 const struct got_error *
103 got_get_repo_owner(char **owner, struct request *c)
104 {
105 	struct server *srv = c->srv;
106 	struct transport *t = c->t;
107 	struct got_repository *repo = t->repo;
108 	const char *gitconfig_owner;
109 
110 	*owner = NULL;
111 
112 	if (srv->show_repo_owner == 0)
113 		return NULL;
114 
115 	gitconfig_owner = got_repo_get_gitconfig_owner(repo);
116 	if (gitconfig_owner) {
117 		*owner = strdup(gitconfig_owner);
118 		if (*owner == NULL)
119 			return got_error_from_errno("strdup");
120 	} else {
121 		*owner = strdup("");
122 		if (*owner == NULL)
123 			return got_error_from_errno("strdup");
124 	}
125 	return NULL;
126 }
127 
128 const struct got_error *
129 got_get_repo_age(time_t *repo_age, struct request *c, const char *refname)
130 {
131 	const struct got_error *error = NULL;
132 	struct server *srv = c->srv;
133 	struct transport *t = c->t;
134 	struct got_repository *repo = t->repo;
135 	struct got_commit_object *commit = NULL;
136 	struct got_reflist_head refs;
137 	struct got_reflist_entry *re;
138 	time_t committer_time = 0, cmp_time = 0;
139 
140 	TAILQ_INIT(&refs);
141 
142 	if (srv->show_repo_age == 0)
143 		return NULL;
144 
145 	error = got_ref_list(&refs, repo, "refs/heads",
146 	    got_ref_cmp_by_name, NULL);
147 	if (error)
148 		goto done;
149 
150 	/*
151 	 * Find the youngest branch tip in the repository, or the age of
152 	 * the a specific branch tip if a name was provided by the caller.
153 	 */
154 	TAILQ_FOREACH(re, &refs, entry) {
155 		struct got_object_id *id = NULL;
156 
157 		if (refname && strcmp(got_ref_get_name(re->ref), refname) != 0)
158 			continue;
159 
160 		error = got_ref_resolve(&id, repo, re->ref);
161 		if (error)
162 			goto done;
163 
164 		error = got_object_open_as_commit(&commit, repo, id);
165 		free(id);
166 		if (error)
167 			goto done;
168 
169 		committer_time =
170 		    got_object_commit_get_committer_time(commit);
171 		got_object_commit_close(commit);
172 		if (cmp_time < committer_time)
173 			cmp_time = committer_time;
174 
175 		if (refname)
176 			break;
177 	}
178 
179 	if (cmp_time != 0)
180 		*repo_age = cmp_time;
181 done:
182 	got_ref_list_free(&refs);
183 	return error;
184 }
185 
186 static const struct got_error *
187 got_get_repo_commit(struct request *c, struct repo_commit *repo_commit,
188     struct got_commit_object *commit, struct got_reflist_head *refs,
189     struct got_object_id *id)
190 {
191 	const struct got_error *error = NULL;
192 	struct got_reflist_entry *re;
193 	struct got_object_id *id2 = NULL;
194 	struct got_object_qid *parent_id;
195 	struct transport *t = c->t;
196 	struct querystring *qs = c->t->qs;
197 	char *commit_msg = NULL, *commit_msg0;
198 
199 	TAILQ_FOREACH(re, refs, entry) {
200 		char *s;
201 		const char *name;
202 		struct got_tag_object *tag = NULL;
203 		struct got_object_id *ref_id;
204 		int cmp;
205 
206 		if (got_ref_is_symbolic(re->ref))
207 			continue;
208 
209 		name = got_ref_get_name(re->ref);
210 		if (strncmp(name, "refs/", 5) == 0)
211 			name += 5;
212 		if (strncmp(name, "got/", 4) == 0)
213 			continue;
214 		if (strncmp(name, "heads/", 6) == 0)
215 			name += 6;
216 		if (strncmp(name, "remotes/", 8) == 0) {
217 			name += 8;
218 			if (strstr(name, "/" GOT_REF_HEAD) != NULL)
219 				continue;
220 		}
221 		error = got_ref_resolve(&ref_id, t->repo, re->ref);
222 		if (error)
223 			return error;
224 		if (strncmp(name, "tags/", 5) == 0) {
225 			error = got_object_open_as_tag(&tag, t->repo, ref_id);
226 			if (error) {
227 				if (error->code != GOT_ERR_OBJ_TYPE) {
228 					free(ref_id);
229 					continue;
230 				}
231 				/*
232 				 * Ref points at something other
233 				 * than a tag.
234 				 */
235 				error = NULL;
236 				tag = NULL;
237 			}
238 		}
239 		cmp = got_object_id_cmp(tag ?
240 		    got_object_tag_get_object_id(tag) : ref_id, id);
241 		free(ref_id);
242 		if (tag)
243 			got_object_tag_close(tag);
244 		if (cmp != 0)
245 			continue;
246 		s = repo_commit->refs_str;
247 		if (asprintf(&repo_commit->refs_str, "%s%s%s", s ? s : "",
248 		    s ? ", " : "", name) == -1) {
249 			error = got_error_from_errno("asprintf");
250 			free(s);
251 			repo_commit->refs_str = NULL;
252 			return error;
253 		}
254 		free(s);
255 	}
256 
257 	error = got_object_id_str(&repo_commit->commit_id, id);
258 	if (error)
259 		return error;
260 
261 	error = got_object_id_str(&repo_commit->tree_id,
262 	    got_object_commit_get_tree_id(commit));
263 	if (error)
264 		return error;
265 
266 	if (qs->action == DIFF) {
267 		parent_id = STAILQ_FIRST(
268 		    got_object_commit_get_parent_ids(commit));
269 		if (parent_id != NULL) {
270 			id2 = got_object_id_dup(&parent_id->id);
271 			error = got_object_id_str(&repo_commit->parent_id, id2);
272 			if (error)
273 				return error;
274 			free(id2);
275 		} else {
276 			repo_commit->parent_id = strdup("/dev/null");
277 			if (repo_commit->parent_id == NULL) {
278 				error = got_error_from_errno("strdup");
279 				return error;
280 			}
281 		}
282 	}
283 
284 	repo_commit->committer_time =
285 	    got_object_commit_get_committer_time(commit);
286 
287 	repo_commit->author =
288 	    strdup(got_object_commit_get_author(commit));
289 	if (repo_commit->author == NULL) {
290 		error = got_error_from_errno("strdup");
291 		return error;
292 	}
293 	repo_commit->committer =
294 	    strdup(got_object_commit_get_committer(commit));
295 	if (repo_commit->committer == NULL) {
296 		error = got_error_from_errno("strdup");
297 		return error;
298 	}
299 	error = got_object_commit_get_logmsg(&commit_msg0, commit);
300 	if (error)
301 		return error;
302 
303 	commit_msg = commit_msg0;
304 	while (*commit_msg == '\n')
305 		commit_msg++;
306 
307 	repo_commit->commit_msg = strdup(commit_msg);
308 	if (repo_commit->commit_msg == NULL)
309 		error = got_error_from_errno("strdup");
310 	free(commit_msg0);
311 	return error;
312 }
313 
314 const struct got_error *
315 got_get_repo_commits(struct request *c, int limit)
316 {
317 	const struct got_error *error = NULL;
318 	struct got_object_id *id = NULL;
319 	struct got_commit_graph *graph = NULL;
320 	struct got_commit_object *commit = NULL;
321 	struct got_reflist_head refs;
322 	struct got_reference *ref = NULL;
323 	struct repo_commit *repo_commit = NULL;
324 	struct server *srv = c->srv;
325 	struct transport *t = c->t;
326 	struct got_repository *repo = t->repo;
327 	struct querystring *qs = t->qs;
328 	struct repo_dir *repo_dir = t->repo_dir;
329 	char *in_repo_path = NULL, *repo_path = NULL, *file_path = NULL;
330 	int chk_next = 0, chk_multi = 0, commit_found = 0;
331 	int obj_type, limit_chk = 0;
332 
333 	TAILQ_INIT(&refs);
334 
335 	if (qs->file != NULL && strlen(qs->file) > 0)
336 		if (asprintf(&file_path, "%s/%s", qs->folder ? qs->folder : "",
337 		    qs->file) == -1)
338 			return got_error_from_errno("asprintf");
339 
340 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
341 	    repo_dir->name) == -1) {
342 		error = got_error_from_errno("asprintf");
343 		goto done;
344 	}
345 
346 	/*
347 	 * XXX: jumping directly to a commit id via
348 	 * got_repo_match_object_id_prefix significantly improves performance,
349 	 * but does not allow us to create a PREVIOUS button, since commits can
350 	 * only be itereated forward. So, we have to match as we iterate from
351 	 * the headref.
352 	 */
353 	if (qs->action == BRIEFS || qs->action == COMMITS ||
354 	    (qs->action == TREE && qs->commit == NULL)) {
355 		error = got_ref_open(&ref, repo, qs->headref, 0);
356 		if (error)
357 			goto done;
358 
359 		error = got_ref_resolve(&id, repo, ref);
360 		if (error)
361 			goto done;
362 	} else if (qs->commit != NULL) {
363 		error = got_ref_open(&ref, repo, qs->commit, 0);
364 		if (error == NULL) {
365 			error = got_ref_resolve(&id, repo, ref);
366 			if (error)
367 				goto done;
368 			error = got_object_get_type(&obj_type, repo, id);
369 			if (error)
370 				goto done;
371 			if (obj_type == GOT_OBJ_TYPE_TAG) {
372 				struct got_tag_object *tag;
373 				error = got_object_open_as_tag(&tag, repo, id);
374 				if (error)
375 					goto done;
376 				if (got_object_tag_get_object_type(tag) !=
377 				    GOT_OBJ_TYPE_COMMIT) {
378 					got_object_tag_close(tag);
379 					error = got_error(GOT_ERR_OBJ_TYPE);
380 					goto done;
381 				}
382 				free(id);
383 				id = got_object_id_dup(
384 				    got_object_tag_get_object_id(tag));
385 				if (id == NULL)
386 					error = got_error_from_errno(
387 					    "got_object_id_dup");
388 				got_object_tag_close(tag);
389 				if (error)
390 					goto done;
391 			} else if (obj_type != GOT_OBJ_TYPE_COMMIT) {
392 				error = got_error(GOT_ERR_OBJ_TYPE);
393 				goto done;
394 			}
395 		}
396 		error = got_repo_match_object_id_prefix(&id, qs->commit,
397 		    GOT_OBJ_TYPE_COMMIT, repo);
398 		if (error)
399 			goto done;
400 	}
401 
402 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
403 	if (error)
404 		goto done;
405 
406 	error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name, NULL);
407 	if (error)
408 		goto done;
409 
410 	if (qs->file != NULL && strlen(qs->file) > 0) {
411 		error = got_commit_graph_open(&graph, file_path, 0);
412 		if (error)
413 			goto done;
414 	} else {
415 		error = got_commit_graph_open(&graph, in_repo_path, 0);
416 		if (error)
417 			goto done;
418 	}
419 
420 	error = got_commit_graph_iter_start(graph, id, repo, NULL, NULL);
421 	if (error)
422 		goto done;
423 
424 	for (;;) {
425 		struct got_object_id next_id;
426 
427 		error = got_commit_graph_iter_next(&next_id, graph, repo, NULL,
428 		    NULL);
429 		if (error) {
430 			if (error->code == GOT_ERR_ITER_COMPLETED)
431 				error = NULL;
432 			goto done;
433 		}
434 
435 		error = got_object_open_as_commit(&commit, repo, &next_id);
436 		if (error)
437 			goto done;
438 
439 		error = got_init_repo_commit(&repo_commit);
440 		if (error)
441 			goto done;
442 
443 		error = got_get_repo_commit(c, repo_commit, commit,
444 		    &refs, &next_id);
445 		if (error) {
446 			gotweb_free_repo_commit(repo_commit);
447 			goto done;
448 		}
449 
450 		if (limit_chk == ((limit * qs->page) - limit) &&
451 		    commit_found == 0 && repo_commit->commit_id != NULL) {
452 			t->prev_id = strdup(repo_commit->commit_id);
453 			if (t->prev_id == NULL) {
454 				error = got_error_from_errno("strdup");
455 				gotweb_free_repo_commit(repo_commit);
456 				goto done;
457 			}
458 		}
459 
460 		if (qs->commit != NULL && commit_found == 0 && limit != 1) {
461 			if (strcmp(qs->commit, repo_commit->commit_id) == 0)
462 				commit_found = 1;
463 			else if (qs->file != NULL && strlen(qs->file) > 0 &&
464 			    qs->page == 0)
465 				commit_found = 1;
466 			else {
467 				gotweb_free_repo_commit(repo_commit);
468 				limit_chk++;
469 				continue;
470 			}
471 		}
472 
473 		TAILQ_INSERT_TAIL(&t->repo_commits, repo_commit, entry);
474 
475 		if (limit == 1 && chk_multi == 0 &&
476 		    srv->max_commits_display != 1)
477 			commit_found = 1;
478 		else {
479 			chk_multi = 1;
480 
481 			/*
482 			 * check for one more commit before breaking,
483 			 * so we know whether to navigate through briefs
484 			 * commits and summary
485 			 */
486 			if (chk_next && (qs->action == BRIEFS ||
487 			    qs->action == COMMITS || qs->action == SUMMARY)) {
488 				t->next_id = strdup(repo_commit->commit_id);
489 				if (t->next_id == NULL) {
490 					error = got_error_from_errno("strdup");
491 					goto done;
492 				}
493 				if (commit) {
494 					got_object_commit_close(commit);
495 					commit = NULL;
496 				}
497 				TAILQ_REMOVE(&t->repo_commits, repo_commit,
498 				    entry);
499 				gotweb_free_repo_commit(repo_commit);
500 				goto done;
501 			}
502 		}
503 		if (error || (limit && --limit == 0)) {
504 			if (commit_found || (qs->file != NULL &&
505 			    strlen(qs->file) > 0))
506 				if (chk_multi == 0)
507 					break;
508 			chk_next = 1;
509 		}
510 		if (commit) {
511 			got_object_commit_close(commit);
512 			commit = NULL;
513 		}
514 	}
515 done:
516 	if (ref)
517 		got_ref_close(ref);
518 	if (commit)
519 		got_object_commit_close(commit);
520 	if (graph)
521 		got_commit_graph_close(graph);
522 	got_ref_list_free(&refs);
523 	free(in_repo_path);
524 	free(file_path);
525 	free(repo_path);
526 	free(id);
527 	return error;
528 }
529 
530 const struct got_error *
531 got_get_repo_tags(struct request *c, int limit)
532 {
533 	const struct got_error *error = NULL;
534 	struct got_object_id *id = NULL;
535 	struct got_commit_object *commit = NULL;
536 	struct got_reflist_head refs;
537 	struct got_reference *ref;
538 	struct got_reflist_entry *re;
539 	struct server *srv = c->srv;
540 	struct transport *t = c->t;
541 	struct got_repository *repo = t->repo;
542 	struct querystring *qs = t->qs;
543 	struct repo_dir *repo_dir = t->repo_dir;
544 	struct got_tag_object *tag = NULL;
545 	struct repo_tag *rt = NULL, *trt = NULL;
546 	char *in_repo_path = NULL, *repo_path = NULL, *id_str = NULL;
547 	char *tag_commit = NULL, *tag_commit0 = NULL;
548 	char *commit_msg = NULL, *commit_msg0 = NULL;
549 	int chk_next = 0, chk_multi = 1, commit_found = 0, c_cnt = 0;
550 
551 	TAILQ_INIT(&refs);
552 
553 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
554 	    repo_dir->name) == -1)
555 		return got_error_from_errno("asprintf");
556 
557 	if (qs->commit == NULL && (qs->action == TAGS || qs->action == RSS)) {
558 		error = got_ref_open(&ref, repo, qs->headref, 0);
559 		if (error)
560 			goto err;
561 		error = got_ref_resolve(&id, repo, ref);
562 		got_ref_close(ref);
563 		if (error)
564 			goto err;
565 	} else if (qs->commit == NULL && qs->action == TAG) {
566 		error = got_error_msg(GOT_ERR_EOF, "commit id missing");
567 		goto err;
568 	} else {
569 		error = got_repo_match_object_id_prefix(&id, qs->commit,
570 		    GOT_OBJ_TYPE_COMMIT, repo);
571 		if (error)
572 			goto err;
573 	}
574 
575 	if (qs->action != SUMMARY && qs->action != TAGS) {
576 		error = got_object_open_as_commit(&commit, repo, id);
577 		if (error)
578 			goto err;
579 		error = got_object_commit_get_logmsg(&commit_msg0, commit);
580 		if (error)
581 			goto err;
582 		if (commit) {
583 			got_object_commit_close(commit);
584 			commit = NULL;
585 		}
586 	}
587 
588 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
589 	if (error)
590 		goto err;
591 
592 	error = got_ref_list(&refs, repo, "refs/tags", got_ref_cmp_tags,
593 	   repo);
594 	if (error)
595 		goto err;
596 
597 	if (limit == 1)
598 		chk_multi = 0;
599 
600 	/*
601 	 * XXX: again, see previous message about caching
602 	 */
603 
604 	TAILQ_FOREACH(re, &refs, entry) {
605 		struct repo_tag *new_repo_tag = NULL;
606 		error = got_init_repo_tag(&new_repo_tag);
607 		if (error)
608 			goto err;
609 
610 		TAILQ_INSERT_TAIL(&t->repo_tags, new_repo_tag, entry);
611 
612 		new_repo_tag->tag_name = strdup(got_ref_get_name(re->ref));
613 		if (new_repo_tag->tag_name == NULL) {
614 			error = got_error_from_errno("strdup");
615 			goto err;
616 		}
617 
618 		free(id);
619 		id = NULL;
620 
621 		free(id_str);
622 		id_str = NULL;
623 
624 		error = got_ref_resolve(&id, repo, re->ref);
625 		if (error)
626 			goto done;
627 
628 		if (tag)
629 			got_object_tag_close(tag);
630 		error = got_object_open_as_tag(&tag, repo, id);
631 		if (error) {
632 			if (error->code != GOT_ERR_OBJ_TYPE)
633 				goto done;
634 			/* "lightweight" tag */
635 			error = got_object_open_as_commit(&commit, repo, id);
636 			if (error)
637 				goto done;
638 			new_repo_tag->tagger =
639 			    strdup(got_object_commit_get_committer(commit));
640 			if (new_repo_tag->tagger == NULL) {
641 				error = got_error_from_errno("strdup");
642 				goto err;
643 			}
644 			new_repo_tag->tagger_time =
645 			    got_object_commit_get_committer_time(commit);
646 			error = got_object_id_str(&id_str, id);
647 			if (error)
648 				goto err;
649 		} else {
650 			new_repo_tag->tagger =
651 			    strdup(got_object_tag_get_tagger(tag));
652 			if (new_repo_tag->tagger == NULL) {
653 				error = got_error_from_errno("strdup");
654 				goto err;
655 			}
656 			new_repo_tag->tagger_time =
657 			    got_object_tag_get_tagger_time(tag);
658 			error = got_object_id_str(&id_str,
659 			    got_object_tag_get_object_id(tag));
660 			if (error)
661 				goto err;
662 		}
663 
664 		new_repo_tag->commit_id = strdup(id_str);
665 		if (new_repo_tag->commit_id == NULL)
666 			goto err;
667 
668 		if (commit_found == 0 && qs->commit != NULL &&
669 		    strncmp(id_str, qs->commit, strlen(id_str)) != 0)
670 			continue;
671 		else
672 			commit_found = 1;
673 
674 		t->tag_count++;
675 
676 		/*
677 		 * check for one more commit before breaking,
678 		 * so we know whether to navigate through briefs
679 		 * commits and summary
680 		 */
681 		if (chk_next) {
682 			t->next_id = strdup(new_repo_tag->commit_id);
683 			if (t->next_id == NULL) {
684 				error = got_error_from_errno("strdup");
685 				goto err;
686 			}
687 			if (commit) {
688 				got_object_commit_close(commit);
689 				commit = NULL;
690 			}
691 			TAILQ_REMOVE(&t->repo_tags, new_repo_tag, entry);
692 			gotweb_free_repo_tag(new_repo_tag);
693 			goto done;
694 		}
695 
696 		if (commit) {
697 			error = got_object_commit_get_logmsg(&tag_commit0,
698 			    commit);
699 			if (error)
700 				goto err;
701 			got_object_commit_close(commit);
702 			commit = NULL;
703 		} else {
704 			tag_commit0 = strdup(got_object_tag_get_message(tag));
705 			if (tag_commit0 == NULL) {
706 				error = got_error_from_errno("strdup");
707 				goto err;
708 			}
709 		}
710 
711 		tag_commit = tag_commit0;
712 		while (*tag_commit == '\n')
713 			tag_commit++;
714 		new_repo_tag->tag_commit = strdup(tag_commit);
715 		if (new_repo_tag->tag_commit == NULL) {
716 			error = got_error_from_errno("strdup");
717 			free(tag_commit0);
718 			goto err;
719 		}
720 		free(tag_commit0);
721 
722 		if (qs->action != SUMMARY && qs->action != TAGS) {
723 			commit_msg = commit_msg0;
724 			while (*commit_msg == '\n')
725 				commit_msg++;
726 
727 			new_repo_tag->commit_msg = strdup(commit_msg);
728 			if (new_repo_tag->commit_msg == NULL) {
729 				error = got_error_from_errno("strdup");
730 				goto err;
731 			}
732 		}
733 
734 		if (limit && --limit == 0) {
735 			if (chk_multi == 0)
736 				break;
737 			chk_next = 1;
738 		}
739 	}
740 
741 done:
742 	/*
743 	 * we have tailq populated, so find previous commit id
744 	 * for navigation through briefs and commits
745 	 */
746 	if (t->tag_count == 0) {
747 		TAILQ_FOREACH_SAFE(rt, &t->repo_tags, entry, trt) {
748 			TAILQ_REMOVE(&t->repo_tags, rt, entry);
749 			gotweb_free_repo_tag(rt);
750 		}
751 	}
752 	if (t->tag_count > 0 && t->prev_id == NULL && qs->commit != NULL) {
753 		commit_found = 0;
754 		TAILQ_FOREACH_REVERSE(rt, &t->repo_tags, repo_tags_head,
755 		    entry) {
756 			if (commit_found == 0 && rt->commit_id != NULL &&
757 			    strcmp(qs->commit, rt->commit_id) != 0) {
758 				continue;
759 			} else
760 				commit_found = 1;
761 			if (c_cnt == srv->max_commits_display ||
762 			    rt == TAILQ_FIRST(&t->repo_tags)) {
763 				t->prev_id = strdup(rt->commit_id);
764 				if (t->prev_id == NULL)
765 					error = got_error_from_errno("strdup");
766 				break;
767 			}
768 			c_cnt++;
769 		}
770 	}
771 err:
772 	if (commit)
773 		got_object_commit_close(commit);
774 	if (tag)
775 		got_object_tag_close(tag);
776 	got_ref_list_free(&refs);
777 	free(commit_msg0);
778 	free(in_repo_path);
779 	free(repo_path);
780 	free(id);
781 	free(id_str);
782 	return error;
783 }
784 
785 int
786 got_output_repo_tree(struct request *c,
787     int (*cb)(struct template *, struct got_tree_entry *))
788 {
789 	const struct got_error *error = NULL;
790 	struct transport *t = c->t;
791 	struct got_commit_object *commit = NULL;
792 	struct got_repository *repo = t->repo;
793 	struct querystring *qs = t->qs;
794 	struct repo_commit *rc = NULL;
795 	struct got_object_id *tree_id = NULL, *commit_id = NULL;
796 	struct got_reflist_head refs;
797 	struct got_tree_object *tree = NULL;
798 	struct got_tree_entry *te;
799 	struct repo_dir *repo_dir = t->repo_dir;
800 	char *escaped_name = NULL, *path = NULL;
801 	int nentries, i;
802 
803 	TAILQ_INIT(&refs);
804 
805 	rc = TAILQ_FIRST(&t->repo_commits);
806 
807 	if (qs->folder != NULL) {
808 		path = strdup(qs->folder);
809 		if (path == NULL) {
810 			error = got_error_from_errno("strdup");
811 			goto done;
812 		}
813 	} else {
814 		error = got_repo_map_path(&path, repo, repo_dir->path);
815 		if (error)
816 			goto done;
817 	}
818 
819 	error = got_repo_match_object_id(&commit_id, NULL, rc->commit_id,
820 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
821 	if (error)
822 		goto done;
823 
824 	error = got_object_open_as_commit(&commit, repo, commit_id);
825 	if (error)
826 		goto done;
827 
828 	error = got_object_id_by_path(&tree_id, repo, commit, path);
829 	if (error)
830 		goto done;
831 
832 	error = got_object_open_as_tree(&tree, repo, tree_id);
833 	if (error)
834 		goto done;
835 
836 	nentries = got_object_tree_get_nentries(tree);
837 
838 	for (i = 0; i < nentries; i++) {
839 		te = got_object_tree_get_entry(tree, i);
840 		if (cb(c->tp, te) == -1)
841 			break;
842 	}
843 done:
844 	free(escaped_name);
845 	free(path);
846 	got_ref_list_free(&refs);
847 	if (commit)
848 		got_object_commit_close(commit);
849 	if (tree)
850 		got_object_tree_close(tree);
851 	free(commit_id);
852 	free(tree_id);
853 	if (error) {
854 		log_warnx("%s: %s", __func__, error->msg);
855 		return -1;
856 	}
857 	return 0;
858 }
859 
860 const struct got_error *
861 got_open_blob_for_output(struct got_blob_object **blob, int *fd,
862     int *binary, struct request *c)
863 {
864 	const struct got_error *error = NULL;
865 	struct transport *t = c->t;
866 	struct got_repository *repo = t->repo;
867 	struct querystring *qs = c->t->qs;
868 	struct got_commit_object *commit = NULL;
869 	struct got_object_id *commit_id = NULL;
870 	struct got_reflist_head refs;
871 	char *path = NULL, *in_repo_path = NULL;
872 	int obj_type;
873 
874 	TAILQ_INIT(&refs);
875 
876 	*blob = NULL;
877 	*fd = -1;
878 	*binary = 0;
879 
880 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
881 	    qs->folder ? "/" : "", qs->file) == -1) {
882 		error = got_error_from_errno("asprintf");
883 		goto done;
884 	}
885 
886 	error = got_repo_map_path(&in_repo_path, repo, path);
887 	if (error)
888 		goto done;
889 
890 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
891 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
892 	if (error)
893 		goto done;
894 
895 	error = got_object_open_as_commit(&commit, repo, commit_id);
896 	if (error)
897 		goto done;
898 
899 	error = got_object_id_by_path(&commit_id, repo, commit, in_repo_path);
900 	if (error)
901 		goto done;
902 
903 	if (commit_id == NULL) {
904 		error = got_error(GOT_ERR_NO_OBJ);
905 		goto done;
906 	}
907 
908 	error = got_object_get_type(&obj_type, repo, commit_id);
909 	if (error)
910 		goto done;
911 
912 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
913 		error = got_error(GOT_ERR_OBJ_TYPE);
914 		goto done;
915 	}
916 
917 	error = got_gotweb_dupfd(&c->priv_fd[BLOB_FD_1], fd);
918 	if (error)
919 		goto done;
920 
921 	error = got_object_open_as_blob(blob, repo, commit_id, BUF, *fd);
922 	if (error)
923 		goto done;
924 
925 	error = got_object_blob_is_binary(binary, *blob);
926 	if (error)
927 		goto done;
928 
929  done:
930 	if (commit)
931 		got_object_commit_close(commit);
932 
933 	if (error) {
934 		if (*fd != -1)
935 			close(*fd);
936 		if (*blob)
937 			got_object_blob_close(*blob);
938 		*fd = -1;
939 		*blob = NULL;
940 	}
941 
942 	free(in_repo_path);
943 	free(commit_id);
944 	free(path);
945 	return error;
946 }
947 
948 int
949 got_output_blob_by_lines(struct template *tp, struct got_blob_object *blob,
950     int (*cb)(struct template *, const char *, size_t))
951 {
952 	const struct got_error	*err;
953 	char			*line = NULL;
954 	size_t			 linesize = 0;
955 	size_t			 lineno = 0;
956 	ssize_t			 linelen = 0;
957 
958 	for (;;) {
959 		err = got_object_blob_getline(&line, &linelen, &linesize,
960 		    blob);
961 		if (err || linelen == -1)
962 			break;
963 		lineno++;
964 		if (cb(tp, line, lineno) == -1)
965 			break;
966 	}
967 
968 	free(line);
969 
970 	if (err) {
971 		log_warnx("%s: got_object_blob_getline failed: %s",
972 		    __func__, err->msg);
973 		return -1;
974 	}
975 	return 0;
976 }
977 
978 struct blame_cb_args {
979 	struct blame_line *lines;
980 	int nlines;
981 	int nlines_prec;
982 	int lineno_cur;
983 	off_t *line_offsets;
984 	FILE *f;
985 	struct got_repository *repo;
986 	struct request *c;
987 	got_render_blame_line_cb cb;
988 };
989 
990 static const struct got_error *
991 got_gotweb_blame_cb(void *arg, int nlines, int lineno,
992     struct got_commit_object *commit, struct got_object_id *id)
993 {
994 	const struct got_error *err = NULL;
995 	struct blame_cb_args *a = arg;
996 	struct blame_line *bline;
997 	struct request *c = a->c;
998 	char *line = NULL;
999 	size_t linesize = 0;
1000 	off_t offset;
1001 	struct tm tm;
1002 	time_t committer_time;
1003 
1004 	if (nlines != a->nlines ||
1005 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
1006 		return got_error(GOT_ERR_RANGE);
1007 
1008 	if (lineno == -1)
1009 		return NULL; /* no change in this commit */
1010 
1011 	/* Annotate this line. */
1012 	bline = &a->lines[lineno - 1];
1013 	if (bline->annotated)
1014 		return NULL;
1015 	err = got_object_id_str(&bline->id_str, id);
1016 	if (err)
1017 		return err;
1018 
1019 	bline->committer = strdup(got_object_commit_get_committer(commit));
1020 	if (bline->committer == NULL) {
1021 		err = got_error_from_errno("strdup");
1022 		goto done;
1023 	}
1024 
1025 	committer_time = got_object_commit_get_committer_time(commit);
1026 	if (gmtime_r(&committer_time, &tm) == NULL)
1027 		return got_error_from_errno("gmtime_r");
1028 	if (strftime(bline->datebuf, sizeof(bline->datebuf), "%G-%m-%d",
1029 	    &tm) == 0) {
1030 		err = got_error(GOT_ERR_NO_SPACE);
1031 		goto done;
1032 	}
1033 	bline->annotated = 1;
1034 
1035 	/* Print lines annotated so far. */
1036 	bline = &a->lines[a->lineno_cur - 1];
1037 	if (!bline->annotated)
1038 		goto done;
1039 
1040 	offset = a->line_offsets[a->lineno_cur - 1];
1041 	if (fseeko(a->f, offset, SEEK_SET) == -1) {
1042 		err = got_error_from_errno("fseeko");
1043 		goto done;
1044 	}
1045 
1046 	while (a->lineno_cur <= a->nlines && bline->annotated) {
1047 		if (getline(&line, &linesize, a->f) == -1) {
1048 			if (ferror(a->f))
1049 				err = got_error_from_errno("getline");
1050 			break;
1051 		}
1052 
1053 		if (a->cb(c->tp, line, bline, a->nlines_prec,
1054 		    a->lineno_cur) == -1)
1055 			break;
1056 
1057 		a->lineno_cur++;
1058 		bline = &a->lines[a->lineno_cur - 1];
1059 	}
1060 done:
1061 	free(line);
1062 	return err;
1063 }
1064 
1065 const struct got_error *
1066 got_output_file_blame(struct request *c, got_render_blame_line_cb cb)
1067 {
1068 	const struct got_error *error = NULL;
1069 	struct transport *t = c->t;
1070 	struct got_repository *repo = t->repo;
1071 	struct querystring *qs = c->t->qs;
1072 	struct got_object_id *obj_id = NULL, *commit_id = NULL;
1073 	struct got_commit_object *commit = NULL;
1074 	struct got_reflist_head refs;
1075 	struct got_blob_object *blob = NULL;
1076 	char *path = NULL, *in_repo_path = NULL;
1077 	struct blame_cb_args bca;
1078 	int i, obj_type, fd1 = -1, fd2 = -1, fd3 = -1, fd4 = -1, fd5 = -1;
1079 	int fd6 = -1;
1080 	off_t filesize;
1081 	FILE *f1 = NULL, *f2 = NULL;
1082 
1083 	TAILQ_INIT(&refs);
1084 	bca.f = NULL;
1085 	bca.lines = NULL;
1086 	bca.cb = cb;
1087 
1088 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1089 	    qs->folder ? "/" : "", qs->file) == -1) {
1090 		error = got_error_from_errno("asprintf");
1091 		goto done;
1092 	}
1093 
1094 	error = got_repo_map_path(&in_repo_path, repo, path);
1095 	if (error)
1096 		goto done;
1097 
1098 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1099 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1100 	if (error)
1101 		goto done;
1102 
1103 	error = got_object_open_as_commit(&commit, repo, commit_id);
1104 	if (error)
1105 		goto done;
1106 
1107 	error = got_object_id_by_path(&obj_id, repo, commit, in_repo_path);
1108 	if (error)
1109 		goto done;
1110 
1111 	error = got_object_get_type(&obj_type, repo, obj_id);
1112 	if (error)
1113 		goto done;
1114 
1115 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1116 		error = got_error(GOT_ERR_OBJ_TYPE);
1117 		goto done;
1118 	}
1119 
1120 	error = got_gotweb_openfile(&bca.f, &c->priv_fd[BLAME_FD_1], &fd1);
1121 	if (error)
1122 		goto done;
1123 
1124 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_2], &fd2);
1125 	if (error)
1126 		goto done;
1127 
1128 	error = got_object_open_as_blob(&blob, repo, obj_id, BUF, fd2);
1129 	if (error)
1130 		goto done;
1131 
1132 	error = got_object_blob_dump_to_file(&filesize, &bca.nlines,
1133 	    &bca.line_offsets, bca.f, blob);
1134 	if (error || bca.nlines == 0)
1135 		goto done;
1136 
1137 	/* Don't include \n at EOF in the blame line count. */
1138 	if (bca.line_offsets[bca.nlines - 1] == filesize)
1139 		bca.nlines--;
1140 
1141 	bca.lines = calloc(bca.nlines, sizeof(*bca.lines));
1142 	if (bca.lines == NULL) {
1143 		error = got_error_from_errno("calloc");
1144 		goto done;
1145 	}
1146 	bca.lineno_cur = 1;
1147 	bca.nlines_prec = 0;
1148 	i = bca.nlines;
1149 	while (i > 0) {
1150 		i /= 10;
1151 		bca.nlines_prec++;
1152 	}
1153 	bca.repo = repo;
1154 	bca.c = c;
1155 
1156 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_3], &fd3);
1157 	if (error)
1158 		goto done;
1159 
1160 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_4], &fd4);
1161 	if (error)
1162 		goto done;
1163 
1164 	error = got_gotweb_openfile(&f1, &c->priv_fd[BLAME_FD_5], &fd5);
1165 	if (error)
1166 		goto done;
1167 
1168 	error = got_gotweb_openfile(&f2, &c->priv_fd[BLAME_FD_6], &fd6);
1169 	if (error)
1170 		goto done;
1171 
1172 	error = got_blame(in_repo_path, commit_id, repo,
1173 	    GOT_DIFF_ALGORITHM_MYERS, got_gotweb_blame_cb, &bca, NULL, NULL,
1174 	    fd3, fd4, f1, f2);
1175 
1176 done:
1177 	if (bca.lines) {
1178 		free(bca.line_offsets);
1179 		for (i = 0; i < bca.nlines; i++) {
1180 			struct blame_line *bline = &bca.lines[i];
1181 			free(bline->id_str);
1182 			free(bline->committer);
1183 		}
1184 	}
1185 	free(bca.lines);
1186 	if (fd2 != -1 && close(fd2) == -1 && error == NULL)
1187 		error = got_error_from_errno("close");
1188 	if (fd3 != -1 && close(fd3) == -1 && error == NULL)
1189 		error = got_error_from_errno("close");
1190 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1191 		error = got_error_from_errno("close");
1192 	if (bca.f) {
1193 		const struct got_error *bca_err =
1194 		    got_gotweb_flushfile(bca.f, fd1);
1195 		if (error == NULL)
1196 			error = bca_err;
1197 	}
1198 	if (f1) {
1199 		const struct got_error *f1_err =
1200 		    got_gotweb_flushfile(f1, fd5);
1201 		if (error == NULL)
1202 			error = f1_err;
1203 	}
1204 	if (f2) {
1205 		const struct got_error *f2_err =
1206 		    got_gotweb_flushfile(f2, fd6);
1207 		if (error == NULL)
1208 			error = f2_err;
1209 	}
1210 	if (commit)
1211 		got_object_commit_close(commit);
1212 	if (blob)
1213 		got_object_blob_close(blob);
1214 	free(in_repo_path);
1215 	free(commit_id);
1216 	free(obj_id);
1217 	free(path);
1218 	got_ref_list_free(&refs);
1219 	return error;
1220 }
1221 
1222 const struct got_error *
1223 got_open_diff_for_output(FILE **fp, int *fd, struct request *c)
1224 {
1225 	const struct got_error *error = NULL;
1226 	struct transport *t = c->t;
1227 	struct got_repository *repo = t->repo;
1228 	struct repo_commit *rc = NULL;
1229 	struct got_object_id *id1 = NULL, *id2 = NULL;
1230 	struct got_reflist_head refs;
1231 	FILE *f1 = NULL, *f2 = NULL, *f3 = NULL;
1232 	int obj_type, fd1, fd2, fd3, fd4 = -1, fd5 = -1;
1233 
1234 	*fp = NULL;
1235 	*fd = -1;
1236 
1237 	TAILQ_INIT(&refs);
1238 
1239 	error = got_gotweb_openfile(&f1, &c->priv_fd[DIFF_FD_1], &fd1);
1240 	if (error)
1241 		return error;
1242 
1243 	error = got_gotweb_openfile(&f2, &c->priv_fd[DIFF_FD_2], &fd2);
1244 	if (error)
1245 		return error;
1246 
1247 	error = got_gotweb_openfile(&f3, &c->priv_fd[DIFF_FD_3], &fd3);
1248 	if (error)
1249 		return error;
1250 
1251 	rc = TAILQ_FIRST(&t->repo_commits);
1252 
1253 	if (rc->parent_id != NULL &&
1254 	    strncmp(rc->parent_id, "/dev/null", 9) != 0) {
1255 		error = got_repo_match_object_id(&id1, NULL,
1256 		    rc->parent_id, GOT_OBJ_TYPE_ANY,
1257 		    &refs, repo);
1258 		if (error)
1259 			goto done;
1260 	}
1261 
1262 	error = got_repo_match_object_id(&id2, NULL, rc->commit_id,
1263 	    GOT_OBJ_TYPE_ANY, &refs, repo);
1264 	if (error)
1265 		goto done;
1266 
1267 	error = got_object_get_type(&obj_type, repo, id2);
1268 	if (error)
1269 		goto done;
1270 
1271 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_4], &fd4);
1272 	if (error)
1273 		goto done;
1274 
1275 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_5], &fd5);
1276 	if (error)
1277 		goto done;
1278 
1279 	switch (obj_type) {
1280 	case GOT_OBJ_TYPE_BLOB:
1281 		error = got_diff_objects_as_blobs(NULL, NULL, f1, f2, fd4, fd5,
1282 		     id1, id2, NULL, NULL, GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1283 		     NULL, repo, f3);
1284 		break;
1285 	case GOT_OBJ_TYPE_TREE:
1286 		error = got_diff_objects_as_trees(NULL, NULL, f1, f2, fd4, fd5,
1287 		    id1, id2, NULL, "", "",  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1288 		    NULL, repo, f3);
1289 		break;
1290 	case GOT_OBJ_TYPE_COMMIT:
1291 		error = got_diff_objects_as_commits(NULL, NULL, f1, f2, fd4,
1292 		    fd5, id1, id2, NULL,  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1293 		    NULL, repo, f3);
1294 		break;
1295 	default:
1296 		error = got_error(GOT_ERR_OBJ_TYPE);
1297 	}
1298 	if (error)
1299 		goto done;
1300 
1301 	if (fseek(f1, 0, SEEK_SET) == -1) {
1302 		error = got_ferror(f1, GOT_ERR_IO);
1303 		goto done;
1304 	}
1305 
1306 	if (fseek(f2, 0, SEEK_SET) == -1) {
1307 		error = got_ferror(f2, GOT_ERR_IO);
1308 		goto done;
1309 	}
1310 
1311 	if (fseek(f3, 0, SEEK_SET) == -1) {
1312 		error = got_ferror(f3, GOT_ERR_IO);
1313 		goto done;
1314 	}
1315 
1316 	*fp = f3;
1317 	*fd = fd3;
1318 
1319 done:
1320 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1321 		error = got_error_from_errno("close");
1322 	if (fd5 != -1 && close(fd5) == -1 && error == NULL)
1323 		error = got_error_from_errno("close");
1324 	if (f1) {
1325 		const struct got_error *f1_err =
1326 		    got_gotweb_flushfile(f1, fd1);
1327 		if (error == NULL)
1328 			error = f1_err;
1329 	}
1330 	if (f2) {
1331 		const struct got_error *f2_err =
1332 		    got_gotweb_flushfile(f2, fd2);
1333 		if (error == NULL)
1334 			error = f2_err;
1335 	}
1336 	if (error && f3) {
1337 		got_gotweb_flushfile(f3, fd3);
1338 		*fp = NULL;
1339 		*fd = -1;
1340 	}
1341 	got_ref_list_free(&refs);
1342 	free(id1);
1343 	free(id2);
1344 	return error;
1345 }
1346 
1347 static const struct got_error *
1348 got_init_repo_commit(struct repo_commit **rc)
1349 {
1350 	*rc = calloc(1, sizeof(**rc));
1351 	if (*rc == NULL)
1352 		return got_error_from_errno2("%s: calloc", __func__);
1353 
1354 	(*rc)->path = NULL;
1355 	(*rc)->refs_str = NULL;
1356 	(*rc)->commit_id = NULL;
1357 	(*rc)->committer = NULL;
1358 	(*rc)->author = NULL;
1359 	(*rc)->parent_id = NULL;
1360 	(*rc)->tree_id = NULL;
1361 	(*rc)->commit_msg = NULL;
1362 
1363 	return NULL;
1364 }
1365 
1366 static const struct got_error *
1367 got_init_repo_tag(struct repo_tag **rt)
1368 {
1369 	*rt = calloc(1, sizeof(**rt));
1370 	if (*rt == NULL)
1371 		return got_error_from_errno2("%s: calloc", __func__);
1372 
1373 	(*rt)->commit_id = NULL;
1374 	(*rt)->tag_name = NULL;
1375 	(*rt)->tag_commit = NULL;
1376 	(*rt)->commit_msg = NULL;
1377 	(*rt)->tagger = NULL;
1378 
1379 	return NULL;
1380 }