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 <imsg.h>
24 #include <sha1.h>
25 #include <stdlib.h>
26 #include <stdio.h>
27 #include <string.h>
28 #include <unistd.h>
29 
30 #include "got_error.h"
31 #include "got_object.h"
32 #include "got_reference.h"
33 #include "got_repository.h"
34 #include "got_path.h"
35 #include "got_cancel.h"
36 #include "got_diff.h"
37 #include "got_commit_graph.h"
38 #include "got_blame.h"
39 #include "got_privsep.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_flushfile(FILE *, int);
52 static const struct got_error *got_gotweb_blame_cb(void *, int, int,
53     struct got_commit_object *,struct got_object_id *);
54 
55 static int
56 isbinary(const uint8_t *buf, size_t n)
57 {
58 	return memchr(buf, '\0', n) != NULL;
59 }
60 
61 
62 static const struct got_error *
63 got_gotweb_flushfile(FILE *f, int fd)
64 {
65 	if (fseek(f, 0, SEEK_SET) == -1)
66 		return got_error_from_errno("fseek");
67 
68 	if (ftruncate(fd, 0) == -1)
69 		return got_error_from_errno("ftruncate");
70 
71 	if (fsync(fd) == -1)
72 		return got_error_from_errno("fsync");
73 
74 	if (f && fclose(f) == EOF)
75 		return got_error_from_errno("fclose");
76 
77 	if (fd != -1 && close(fd) != -1)
78 		return got_error_from_errno("close");
79 
80 	return NULL;
81 }
82 
83 static const struct got_error *
84 got_gotweb_openfile(FILE **f, int *priv_fd, int *fd)
85 {
86 	*fd = dup(*priv_fd);
87 	if (*fd == -1)
88 		return got_error_from_errno("dup");
89 
90 	*f = fdopen(*fd, "w+");
91 	if (*f == NULL) {
92 		close(*fd);
93 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
94 	}
95 
96 	return NULL;
97 }
98 
99 static const struct got_error *
100 got_gotweb_dupfd(int *priv_fd, int *fd)
101 {
102 	*fd = dup(*priv_fd);
103 
104 	if (*fd < 0)
105 		return NULL;
106 
107 	return NULL;
108 }
109 
110 const struct got_error *
111 got_get_repo_owner(char **owner, struct request *c)
112 {
113 	struct server *srv = c->srv;
114 	struct transport *t = c->t;
115 	struct got_repository *repo = t->repo;
116 	const char *gitconfig_owner;
117 
118 	*owner = NULL;
119 
120 	if (srv->show_repo_owner == 0)
121 		return NULL;
122 
123 	gitconfig_owner = got_repo_get_gitconfig_owner(repo);
124 	if (gitconfig_owner) {
125 		*owner = strdup(gitconfig_owner);
126 		if (*owner == NULL)
127 			return got_error_from_errno("strdup");
128 	} else {
129 		*owner = strdup("");
130 		if (*owner == NULL)
131 			return got_error_from_errno("strdup");
132 	}
133 	return NULL;
134 }
135 
136 const struct got_error *
137 got_get_repo_age(char **repo_age, struct request *c,
138     const char *refname, int ref_tm)
139 {
140 	const struct got_error *error = NULL;
141 	struct server *srv = c->srv;
142 	struct transport *t = c->t;
143 	struct got_repository *repo = t->repo;
144 	struct got_commit_object *commit = NULL;
145 	struct got_reflist_head refs;
146 	struct got_reflist_entry *re;
147 	time_t committer_time = 0, cmp_time = 0;
148 
149 	*repo_age = NULL;
150 	TAILQ_INIT(&refs);
151 
152 	if (srv->show_repo_age == 0)
153 		return NULL;
154 
155 	error = got_ref_list(&refs, repo, "refs/heads",
156 	    got_ref_cmp_by_name, NULL);
157 	if (error)
158 		goto done;
159 
160 	/*
161 	 * Find the youngest branch tip in the repository, or the age of
162 	 * the a specific branch tip if a name was provided by the caller.
163 	 */
164 	TAILQ_FOREACH(re, &refs, entry) {
165 		struct got_object_id *id = NULL;
166 
167 		if (refname && strcmp(got_ref_get_name(re->ref), refname) != 0)
168 			continue;
169 
170 		error = got_ref_resolve(&id, repo, re->ref);
171 		if (error)
172 			goto done;
173 
174 		error = got_object_open_as_commit(&commit, repo, id);
175 		free(id);
176 		if (error)
177 			goto done;
178 
179 		committer_time =
180 		    got_object_commit_get_committer_time(commit);
181 		got_object_commit_close(commit);
182 		if (cmp_time < committer_time)
183 			cmp_time = committer_time;
184 
185 		if (refname)
186 			break;
187 	}
188 
189 	if (cmp_time != 0) {
190 		committer_time = cmp_time;
191 		error = gotweb_get_time_str(repo_age, committer_time, ref_tm);
192 	}
193 done:
194 	got_ref_list_free(&refs);
195 	return error;
196 }
197 
198 static const struct got_error *
199 got_get_repo_commit(struct request *c, struct repo_commit *repo_commit,
200     struct got_commit_object *commit, struct got_reflist_head *refs,
201     struct got_object_id *id)
202 {
203 	const struct got_error *error = NULL;
204 	struct got_reflist_entry *re;
205 	struct got_object_id *id2 = NULL;
206 	struct got_object_qid *parent_id;
207 	struct transport *t = c->t;
208 	struct querystring *qs = c->t->qs;
209 	char *commit_msg = NULL, *commit_msg0;
210 
211 	TAILQ_FOREACH(re, refs, entry) {
212 		char *s;
213 		const char *name;
214 		struct got_tag_object *tag = NULL;
215 		struct got_object_id *ref_id;
216 		int cmp;
217 
218 		if (got_ref_is_symbolic(re->ref))
219 			continue;
220 
221 		name = got_ref_get_name(re->ref);
222 		if (strncmp(name, "refs/", 5) == 0)
223 			name += 5;
224 		if (strncmp(name, "got/", 4) == 0)
225 			continue;
226 		if (strncmp(name, "heads/", 6) == 0)
227 			name += 6;
228 		if (strncmp(name, "remotes/", 8) == 0) {
229 			name += 8;
230 			if (strstr(name, "/" GOT_REF_HEAD) != NULL)
231 				continue;
232 		}
233 		error = got_ref_resolve(&ref_id, t->repo, re->ref);
234 		if (error)
235 			return error;
236 		if (strncmp(name, "tags/", 5) == 0) {
237 			error = got_object_open_as_tag(&tag, t->repo, ref_id);
238 			if (error) {
239 				if (error->code != GOT_ERR_OBJ_TYPE) {
240 					free(ref_id);
241 					continue;
242 				}
243 				/*
244 				 * Ref points at something other
245 				 * than a tag.
246 				 */
247 				error = NULL;
248 				tag = NULL;
249 			}
250 		}
251 		cmp = got_object_id_cmp(tag ?
252 		    got_object_tag_get_object_id(tag) : ref_id, id);
253 		free(ref_id);
254 		if (tag)
255 			got_object_tag_close(tag);
256 		if (cmp != 0)
257 			continue;
258 		s = repo_commit->refs_str;
259 		if (asprintf(&repo_commit->refs_str, "%s%s%s", s ? s : "",
260 		    s ? ", " : "", name) == -1) {
261 			error = got_error_from_errno("asprintf");
262 			free(s);
263 			repo_commit->refs_str = NULL;
264 			return error;
265 		}
266 		free(s);
267 	}
268 
269 	error = got_object_id_str(&repo_commit->commit_id, id);
270 	if (error)
271 		return error;
272 
273 	error = got_object_id_str(&repo_commit->tree_id,
274 	    got_object_commit_get_tree_id(commit));
275 	if (error)
276 		return error;
277 
278 	if (qs->action == DIFF) {
279 		parent_id = STAILQ_FIRST(
280 		    got_object_commit_get_parent_ids(commit));
281 		if (parent_id != NULL) {
282 			id2 = got_object_id_dup(&parent_id->id);
283 			error = got_object_id_str(&repo_commit->parent_id, id2);
284 			if (error)
285 				return error;
286 			free(id2);
287 		} else {
288 			repo_commit->parent_id = strdup("/dev/null");
289 			if (repo_commit->parent_id == NULL) {
290 				error = got_error_from_errno("strdup");
291 				return error;
292 			}
293 		}
294 	}
295 
296 	repo_commit->committer_time =
297 	    got_object_commit_get_committer_time(commit);
298 
299 	repo_commit->author =
300 	    strdup(got_object_commit_get_author(commit));
301 	if (repo_commit->author == NULL) {
302 		error = got_error_from_errno("strdup");
303 		return error;
304 	}
305 	repo_commit->committer =
306 	    strdup(got_object_commit_get_committer(commit));
307 	if (repo_commit->committer == NULL) {
308 		error = got_error_from_errno("strdup");
309 		return error;
310 	}
311 	error = got_object_commit_get_logmsg(&commit_msg0, commit);
312 	if (error)
313 		return error;
314 
315 	commit_msg = commit_msg0;
316 	while (*commit_msg == '\n')
317 		commit_msg++;
318 
319 	repo_commit->commit_msg = strdup(commit_msg);
320 	if (repo_commit->commit_msg == NULL)
321 		error = got_error_from_errno("strdup");
322 	free(commit_msg0);
323 	return error;
324 }
325 
326 const struct got_error *
327 got_get_repo_commits(struct request *c, int limit)
328 {
329 	const struct got_error *error = NULL;
330 	struct got_object_id *id = NULL;
331 	struct got_commit_graph *graph = NULL;
332 	struct got_commit_object *commit = NULL;
333 	struct got_reflist_head refs;
334 	struct got_reference *ref = NULL;
335 	struct repo_commit *repo_commit = NULL;
336 	struct server *srv = c->srv;
337 	struct transport *t = c->t;
338 	struct got_repository *repo = t->repo;
339 	struct querystring *qs = t->qs;
340 	struct repo_dir *repo_dir = t->repo_dir;
341 	char *in_repo_path = NULL, *repo_path = NULL, *file_path = NULL;
342 	int chk_next = 0, chk_multi = 0, commit_found = 0;
343 	int obj_type, limit_chk = 0;
344 
345 	TAILQ_INIT(&refs);
346 
347 	if (qs->file != NULL && strlen(qs->file) > 0)
348 		if (asprintf(&file_path, "%s/%s", qs->folder ? qs->folder : "",
349 		    qs->file) == -1)
350 			return got_error_from_errno("asprintf");
351 
352 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
353 	    repo_dir->name) == -1) {
354 		error = got_error_from_errno("asprintf");
355 		goto done;
356 	}
357 
358 	/*
359 	 * XXX: jumping directly to a commit id via
360 	 * got_repo_match_object_id_prefix significantly improves performance,
361 	 * but does not allow us to create a PREVIOUS button, since commits can
362 	 * only be itereated forward. So, we have to match as we iterate from
363 	 * the headref.
364 	 */
365 	if (qs->action == BRIEFS || qs->action == COMMITS ||
366 	    (qs->action == TREE && qs->commit == NULL)) {
367 		error = got_ref_open(&ref, repo, qs->headref, 0);
368 		if (error)
369 			goto done;
370 
371 		error = got_ref_resolve(&id, repo, ref);
372 		if (error)
373 			goto done;
374 	} else if (qs->commit != NULL) {
375 		error = got_ref_open(&ref, repo, qs->commit, 0);
376 		if (error == NULL) {
377 			error = got_ref_resolve(&id, repo, ref);
378 			if (error)
379 				goto done;
380 			error = got_object_get_type(&obj_type, repo, id);
381 			if (error)
382 				goto done;
383 			if (obj_type == GOT_OBJ_TYPE_TAG) {
384 				struct got_tag_object *tag;
385 				error = got_object_open_as_tag(&tag, repo, id);
386 				if (error)
387 					goto done;
388 				if (got_object_tag_get_object_type(tag) !=
389 				    GOT_OBJ_TYPE_COMMIT) {
390 					got_object_tag_close(tag);
391 					error = got_error(GOT_ERR_OBJ_TYPE);
392 					goto done;
393 				}
394 				free(id);
395 				id = got_object_id_dup(
396 				    got_object_tag_get_object_id(tag));
397 				if (id == NULL)
398 					error = got_error_from_errno(
399 					    "got_object_id_dup");
400 				got_object_tag_close(tag);
401 				if (error)
402 					goto done;
403 			} else if (obj_type != GOT_OBJ_TYPE_COMMIT) {
404 				error = got_error(GOT_ERR_OBJ_TYPE);
405 				goto done;
406 			}
407 		}
408 		error = got_repo_match_object_id_prefix(&id, qs->commit,
409 		    GOT_OBJ_TYPE_COMMIT, repo);
410 		if (error)
411 			goto done;
412 	}
413 
414 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
415 	if (error)
416 		goto done;
417 
418 	error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name, NULL);
419 	if (error)
420 		goto done;
421 
422 	if (qs->file != NULL && strlen(qs->file) > 0) {
423 		error = got_commit_graph_open(&graph, file_path, 0);
424 		if (error)
425 			goto done;
426 	} else {
427 		error = got_commit_graph_open(&graph, in_repo_path, 0);
428 		if (error)
429 			goto done;
430 	}
431 
432 	error = got_commit_graph_iter_start(graph, id, repo, NULL, NULL);
433 	if (error)
434 		goto done;
435 
436 	for (;;) {
437 		struct got_object_id next_id;
438 
439 		error = got_commit_graph_iter_next(&next_id, graph, repo, NULL,
440 		    NULL);
441 		if (error) {
442 			if (error->code == GOT_ERR_ITER_COMPLETED)
443 				error = NULL;
444 			goto done;
445 		}
446 
447 		error = got_object_open_as_commit(&commit, repo, &next_id);
448 		if (error)
449 			goto done;
450 
451 		error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name,
452 		    NULL);
453 		if (error)
454 			goto done;
455 
456 		error = got_init_repo_commit(&repo_commit);
457 		if (error)
458 			goto done;
459 
460 		error = got_get_repo_commit(c, repo_commit, commit,
461 		    &refs, &next_id);
462 		if (error) {
463 			gotweb_free_repo_commit(repo_commit);
464 			goto done;
465 		}
466 
467 		if (limit_chk == ((limit * qs->page) - limit) &&
468 		    commit_found == 0 && repo_commit->commit_id != NULL) {
469 			t->prev_id = strdup(repo_commit->commit_id);
470 			if (t->prev_id == NULL) {
471 				error = got_error_from_errno("strdup");
472 				gotweb_free_repo_commit(repo_commit);
473 				goto done;
474 			}
475 		}
476 
477 		if (qs->commit != NULL && commit_found == 0 && limit != 1) {
478 			if (strcmp(qs->commit, repo_commit->commit_id) == 0)
479 				commit_found = 1;
480 			else if (qs->file != NULL && strlen(qs->file) > 0 &&
481 			    qs->page == 0)
482 				commit_found = 1;
483 			else {
484 				gotweb_free_repo_commit(repo_commit);
485 				limit_chk++;
486 				continue;
487 			}
488 		}
489 
490 		TAILQ_INSERT_TAIL(&t->repo_commits, repo_commit, entry);
491 
492 		if (limit == 1 && chk_multi == 0 &&
493 		    srv->max_commits_display != 1)
494 			commit_found = 1;
495 		else {
496 			chk_multi = 1;
497 
498 			/*
499 			 * check for one more commit before breaking,
500 			 * so we know whether to navigate through briefs
501 			 * commits and summary
502 			 */
503 			if (chk_next && (qs->action == BRIEFS ||
504 			    qs->action == COMMITS || qs->action == SUMMARY)) {
505 				t->next_id = strdup(repo_commit->commit_id);
506 				if (t->next_id == NULL) {
507 					error = got_error_from_errno("strdup");
508 					goto done;
509 				}
510 				if (commit) {
511 					got_object_commit_close(commit);
512 					commit = NULL;
513 				}
514 				TAILQ_REMOVE(&t->repo_commits, repo_commit,
515 				    entry);
516 				gotweb_free_repo_commit(repo_commit);
517 				goto done;
518 			}
519 		}
520 		got_ref_list_free(&refs);
521 		if (error || (limit && --limit == 0)) {
522 			if (commit_found || (qs->file != NULL &&
523 			    strlen(qs->file) > 0))
524 				if (chk_multi == 0)
525 					break;
526 			chk_next = 1;
527 		}
528 		if (commit) {
529 			got_object_commit_close(commit);
530 			commit = NULL;
531 		}
532 	}
533 done:
534 	if (ref)
535 		got_ref_close(ref);
536 	if (commit)
537 		got_object_commit_close(commit);
538 	if (graph)
539 		got_commit_graph_close(graph);
540 	got_ref_list_free(&refs);
541 	free(in_repo_path);
542 	free(file_path);
543 	free(repo_path);
544 	free(id);
545 	return error;
546 }
547 
548 const struct got_error *
549 got_get_repo_tags(struct request *c, int limit)
550 {
551 	const struct got_error *error = NULL;
552 	struct got_object_id *id = NULL;
553 	struct got_commit_object *commit = NULL;
554 	struct got_reflist_head refs;
555 	struct got_reference *ref;
556 	struct got_reflist_entry *re;
557 	struct server *srv = c->srv;
558 	struct transport *t = c->t;
559 	struct got_repository *repo = t->repo;
560 	struct querystring *qs = t->qs;
561 	struct repo_dir *repo_dir = t->repo_dir;
562 	struct got_tag_object *tag = NULL;
563 	struct repo_tag *rt = NULL, *trt = NULL;
564 	char *in_repo_path = NULL, *repo_path = NULL, *id_str = NULL;
565 	char *tag_commit = NULL, *tag_commit0 = NULL;
566 	char *commit_msg = NULL, *commit_msg0 = NULL;
567 	int chk_next = 0, chk_multi = 1, commit_found = 0, c_cnt = 0;
568 
569 	TAILQ_INIT(&refs);
570 
571 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
572 	    repo_dir->name) == -1)
573 		return got_error_from_errno("asprintf");
574 
575 	if (qs->commit == NULL && qs->action == TAGS) {
576 		error = got_ref_open(&ref, repo, qs->headref, 0);
577 		if (error)
578 			goto err;
579 		error = got_ref_resolve(&id, repo, ref);
580 		got_ref_close(ref);
581 		if (error)
582 			goto err;
583 	} else if (qs->commit == NULL && qs->action == TAG) {
584 		error = got_error_msg(GOT_ERR_EOF, "commit id missing");
585 		goto err;
586 	} else {
587 		error = got_repo_match_object_id_prefix(&id, qs->commit,
588 		    GOT_OBJ_TYPE_COMMIT, repo);
589 		if (error)
590 			goto err;
591 	}
592 
593 	if (qs->action != SUMMARY && qs->action != TAGS) {
594 		error = got_object_open_as_commit(&commit, repo, id);
595 		if (error)
596 			goto err;
597 		error = got_object_commit_get_logmsg(&commit_msg0, commit);
598 		if (error)
599 			goto err;
600 		if (commit) {
601 			got_object_commit_close(commit);
602 			commit = NULL;
603 		}
604 	}
605 
606 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
607 	if (error)
608 		goto err;
609 
610 	error = got_ref_list(&refs, repo, "refs/tags", got_ref_cmp_tags,
611 	   repo);
612 	if (error)
613 		goto err;
614 
615 	if (limit == 1)
616 		chk_multi = 0;
617 
618 	/*
619 	 * XXX: again, see previous message about caching
620 	 */
621 
622 	TAILQ_FOREACH(re, &refs, entry) {
623 		struct repo_tag *new_repo_tag = NULL;
624 		error = got_init_repo_tag(&new_repo_tag);
625 		if (error)
626 			goto err;
627 
628 		TAILQ_INSERT_TAIL(&t->repo_tags, new_repo_tag, entry);
629 
630 		new_repo_tag->tag_name = strdup(got_ref_get_name(re->ref));
631 		if (new_repo_tag->tag_name == NULL) {
632 			error = got_error_from_errno("strdup");
633 			goto err;
634 		}
635 
636 		free(id);
637 		id = NULL;
638 
639 		free(id_str);
640 		id_str = NULL;
641 
642 		error = got_ref_resolve(&id, repo, re->ref);
643 		if (error)
644 			goto done;
645 
646 		if (tag)
647 			got_object_tag_close(tag);
648 		error = got_object_open_as_tag(&tag, repo, id);
649 		if (error) {
650 			if (error->code != GOT_ERR_OBJ_TYPE)
651 				goto done;
652 			/* "lightweight" tag */
653 			error = got_object_open_as_commit(&commit, repo, id);
654 			if (error)
655 				goto done;
656 			new_repo_tag->tagger =
657 			    strdup(got_object_commit_get_committer(commit));
658 			if (new_repo_tag->tagger == NULL) {
659 				error = got_error_from_errno("strdup");
660 				goto err;
661 			}
662 			new_repo_tag->tagger_time =
663 			    got_object_commit_get_committer_time(commit);
664 			error = got_object_id_str(&id_str, id);
665 			if (error)
666 				goto err;
667 		} else {
668 			new_repo_tag->tagger =
669 			    strdup(got_object_tag_get_tagger(tag));
670 			if (new_repo_tag->tagger == NULL) {
671 				error = got_error_from_errno("strdup");
672 				goto err;
673 			}
674 			new_repo_tag->tagger_time =
675 			    got_object_tag_get_tagger_time(tag);
676 			error = got_object_id_str(&id_str,
677 			    got_object_tag_get_object_id(tag));
678 			if (error)
679 				goto err;
680 		}
681 
682 		new_repo_tag->commit_id = strdup(id_str);
683 		if (new_repo_tag->commit_id == NULL)
684 			goto err;
685 
686 		if (commit_found == 0 && qs->commit != NULL &&
687 		    strncmp(id_str, qs->commit, strlen(id_str)) != 0)
688 			continue;
689 		else
690 			commit_found = 1;
691 
692 		t->tag_count++;
693 
694 		/*
695 		 * check for one more commit before breaking,
696 		 * so we know whether to navigate through briefs
697 		 * commits and summary
698 		 */
699 		if (chk_next) {
700 			t->next_id = strdup(new_repo_tag->commit_id);
701 			if (t->next_id == NULL) {
702 				error = got_error_from_errno("strdup");
703 				goto err;
704 			}
705 			if (commit) {
706 				got_object_commit_close(commit);
707 				commit = NULL;
708 			}
709 			TAILQ_REMOVE(&t->repo_tags, new_repo_tag, entry);
710 			gotweb_free_repo_tag(new_repo_tag);
711 			goto done;
712 		}
713 
714 		if (commit) {
715 			error = got_object_commit_get_logmsg(&tag_commit0,
716 			    commit);
717 			if (error)
718 				goto err;
719 			got_object_commit_close(commit);
720 			commit = NULL;
721 		} else {
722 			tag_commit0 = strdup(got_object_tag_get_message(tag));
723 			if (tag_commit0 == NULL) {
724 				error = got_error_from_errno("strdup");
725 				goto err;
726 			}
727 		}
728 
729 		tag_commit = tag_commit0;
730 		while (*tag_commit == '\n')
731 			tag_commit++;
732 		new_repo_tag->tag_commit = strdup(tag_commit);
733 		if (new_repo_tag->tag_commit == NULL) {
734 			error = got_error_from_errno("strdup");
735 			free(tag_commit0);
736 			goto err;
737 		}
738 		free(tag_commit0);
739 
740 		if (qs->action != SUMMARY && qs->action != TAGS) {
741 			commit_msg = commit_msg0;
742 			while (*commit_msg == '\n')
743 				commit_msg++;
744 
745 			new_repo_tag->commit_msg = strdup(commit_msg);
746 			if (new_repo_tag->commit_msg == NULL) {
747 				error = got_error_from_errno("strdup");
748 				goto err;
749 			}
750 		}
751 
752 		if (limit && --limit == 0) {
753 			if (chk_multi == 0)
754 				break;
755 			chk_next = 1;
756 		}
757 	}
758 
759 done:
760 	/*
761 	 * we have tailq populated, so find previous commit id
762 	 * for navigation through briefs and commits
763 	 */
764 	if (t->tag_count == 0) {
765 		TAILQ_FOREACH_SAFE(rt, &t->repo_tags, entry, trt) {
766 			TAILQ_REMOVE(&t->repo_tags, rt, entry);
767 			gotweb_free_repo_tag(rt);
768 		}
769 	}
770 	if (t->tag_count > 0 && t->prev_id == NULL && qs->commit != NULL) {
771 		commit_found = 0;
772 		TAILQ_FOREACH_REVERSE(rt, &t->repo_tags, repo_tags_head,
773 		    entry) {
774 			if (commit_found == 0 && rt->commit_id != NULL &&
775 			    strcmp(qs->commit, rt->commit_id) != 0) {
776 				continue;
777 			} else
778 				commit_found = 1;
779 			if (c_cnt == srv->max_commits_display ||
780 			    rt == TAILQ_FIRST(&t->repo_tags)) {
781 				t->prev_id = strdup(rt->commit_id);
782 				if (t->prev_id == NULL)
783 					error = got_error_from_errno("strdup");
784 				break;
785 			}
786 			c_cnt++;
787 		}
788 	}
789 err:
790 	if (commit)
791 		got_object_commit_close(commit);
792 	if (tag)
793 		got_object_tag_close(tag);
794 	got_ref_list_free(&refs);
795 	free(commit_msg0);
796 	free(in_repo_path);
797 	free(repo_path);
798 	free(id);
799 	free(id_str);
800 	return error;
801 }
802 
803 const struct got_error *
804 got_output_repo_tree(struct request *c)
805 {
806 	const struct got_error *error = NULL;
807 	struct transport *t = c->t;
808 	struct got_commit_object *commit = NULL;
809 	struct got_repository *repo = t->repo;
810 	struct querystring *qs = t->qs;
811 	struct repo_commit *rc = NULL;
812 	struct got_object_id *tree_id = NULL, *commit_id = NULL;
813 	struct got_reflist_head refs;
814 	struct got_tree_object *tree = NULL;
815 	struct repo_dir *repo_dir = t->repo_dir;
816 	const char *name, *folder;
817 	char *escaped_name = NULL, *path = NULL;
818 	int nentries, i, r;
819 
820 	TAILQ_INIT(&refs);
821 
822 	rc = TAILQ_FIRST(&t->repo_commits);
823 
824 	if (qs->folder != NULL) {
825 		path = strdup(qs->folder);
826 		if (path == NULL) {
827 			error = got_error_from_errno("strdup");
828 			goto done;
829 		}
830 	} else {
831 		error = got_repo_map_path(&path, repo, repo_dir->path);
832 		if (error)
833 			goto done;
834 	}
835 
836 	error = got_repo_match_object_id(&commit_id, NULL, rc->commit_id,
837 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
838 	if (error)
839 		goto done;
840 
841 	error = got_object_open_as_commit(&commit, repo, commit_id);
842 	if (error)
843 		goto done;
844 
845 	error = got_object_id_by_path(&tree_id, repo, commit, path);
846 	if (error)
847 		goto done;
848 
849 	error = got_object_open_as_tree(&tree, repo, tree_id);
850 	if (error)
851 		goto done;
852 
853 	nentries = got_object_tree_get_nentries(tree);
854 
855 	folder = qs->folder ? qs->folder : "";
856 
857 	for (i = 0; i < nentries; i++) {
858 		const char *modestr;
859 		struct got_tree_entry *te;
860 		mode_t mode;
861 
862 		te = got_object_tree_get_entry(tree, i);
863 
864 		mode = got_tree_entry_get_mode(te);
865 		if (got_object_tree_entry_is_submodule(te))
866 			modestr = "$";
867 		else if (S_ISLNK(mode))
868 			modestr = "@";
869 		else if (S_ISDIR(mode))
870 			modestr = "/";
871 		else if (mode & S_IXUSR)
872 			modestr = "*";
873 		else
874 			modestr = "";
875 
876 		name = got_tree_entry_get_name(te);
877 		error = gotweb_escape_html(&escaped_name, name);
878 		if (error)
879 			goto done;
880 
881 		if (S_ISDIR(mode)) {
882 			struct gotweb_url url = {
883 				.index_page = -1,
884 				.page = -1,
885 				.action = TREE,
886 				.commit = rc->commit_id,
887 				.path = qs->path,
888 				/* `folder' is filled later */
889 			};
890 			char *path = NULL;
891 
892 			if (fcgi_printf(c,"<div class='tree_wrapper'>\n"
893 			    "<div class='tree_line'>") == -1)
894 				goto done;
895 
896 			if (asprintf(&path, "%s/%s", folder, name) == -1) {
897 				error = got_error_from_errno("asprintf");
898 				goto done;
899 			}
900 			url.folder = path;
901 			r = gotweb_link(c, &url, "%s%s", escaped_name,
902 			    modestr);
903 			free(path);
904 			if (r == -1)
905 				goto done;
906 
907 			if (fcgi_printf(c, "</div>\n" /* .tree_line */
908 			    "<div class='tree_line_blank'>&nbsp;</div>\n"
909 			    "</div>\n") == -1)
910 				goto done;
911 		} else {
912 			struct gotweb_url url = {
913 				.index_page = -1,
914 				.page = -1,
915 				.path = qs->path,
916 				.commit = rc->commit_id,
917 				.folder = folder,
918 				.file = name,
919 			};
920 
921 			if (fcgi_printf(c, "<div class='tree_wrapper'>\n"
922 			    "<div class='tree_line'>") == -1)
923 				goto done;
924 
925 			url.action = BLOB;
926 			r = gotweb_link(c, &url, "%s%s", escaped_name,
927 			    modestr);
928 			if (r == -1)
929 				goto done;
930 
931 			if (fcgi_printf(c, "</div>\n" /* .tree_line */
932 			    "<div class='tree_line_blank'>") == -1)
933 				goto done;
934 
935 			url.action = COMMITS;
936 			r = gotweb_link(c, &url, "commits");
937 			if (r == -1)
938 				goto done;
939 
940 			if (fcgi_printf(c, " | ") == -1)
941 				goto done;
942 
943 			url.action = BLAME;
944 			r = gotweb_link(c, &url, "blame");
945 			if (r == -1)
946 				goto done;
947 
948 			if (fcgi_printf(c,
949 			    "</div>\n"		/* .tree_line_blank */
950 			    "</div>\n") == -1)	/* .tree_wrapper */
951 				goto done;
952 		}
953 		free(escaped_name);
954 		escaped_name = NULL;
955 	}
956 done:
957 	free(escaped_name);
958 	free(path);
959 	got_ref_list_free(&refs);
960 	if (commit)
961 		got_object_commit_close(commit);
962 	if (tree)
963 		got_object_tree_close(tree);
964 	free(commit_id);
965 	free(tree_id);
966 	return error;
967 }
968 
969 const struct got_error *
970 got_output_file_blob(struct request *c)
971 {
972 	const struct got_error *error = NULL;
973 	struct transport *t = c->t;
974 	struct got_repository *repo = t->repo;
975 	struct querystring *qs = c->t->qs;
976 	struct got_commit_object *commit = NULL;
977 	struct got_object_id *commit_id = NULL;
978 	struct got_reflist_head refs;
979 	struct got_blob_object *blob = NULL;
980 	char *path = NULL, *in_repo_path = NULL;
981 	int obj_type, set_mime = 0, fd = -1;
982 	size_t len, hdrlen;
983 	const uint8_t *buf;
984 
985 	TAILQ_INIT(&refs);
986 
987 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
988 	    qs->folder ? "/" : "", qs->file) == -1) {
989 		error = got_error_from_errno("asprintf");
990 		goto done;
991 	}
992 
993 	error = got_repo_map_path(&in_repo_path, repo, path);
994 	if (error)
995 		goto done;
996 
997 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
998 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
999 	if (error)
1000 		goto done;
1001 
1002 	error = got_object_open_as_commit(&commit, repo, commit_id);
1003 	if (error)
1004 		goto done;
1005 
1006 	error = got_object_id_by_path(&commit_id, repo, commit, in_repo_path);
1007 	if (error)
1008 		goto done;
1009 
1010 	if (commit_id == NULL) {
1011 		error = got_error(GOT_ERR_NO_OBJ);
1012 		goto done;
1013 	}
1014 
1015 	error = got_object_get_type(&obj_type, repo, commit_id);
1016 	if (error)
1017 		goto done;
1018 
1019 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1020 		error = got_error(GOT_ERR_OBJ_TYPE);
1021 		goto done;
1022 	}
1023 
1024 	error = got_gotweb_dupfd(&c->priv_fd[BLOB_FD_1], &fd);
1025 	if (error)
1026 		goto done;
1027 
1028 	error = got_object_open_as_blob(&blob, repo, commit_id, BUF, fd);
1029 	if (error)
1030 		goto done;
1031 	hdrlen = got_object_blob_get_hdrlen(blob);
1032 	do {
1033 		error = got_object_blob_read_block(&len, blob);
1034 		if (error)
1035 			goto done;
1036 		buf = got_object_blob_get_read_buf(blob);
1037 
1038 		/*
1039 		 * Skip blob object header first time around,
1040 		 * which also contains a zero byte.
1041 		 */
1042 		buf += hdrlen;
1043 		if (set_mime == 0) {
1044 			if (isbinary(buf, len - hdrlen)) {
1045 				error = gotweb_render_content_type_file(c,
1046 				    "application/octet-stream",
1047 				    qs->file);
1048 				if (error) {
1049 					log_warnx("%s: %s", __func__,
1050 					    error->msg);
1051 					goto done;
1052 				}
1053 			} else {
1054 				error = gotweb_render_content_type(c,
1055 				  "text/plain");
1056 				if (error) {
1057 					log_warnx("%s: %s", __func__,
1058 					    error->msg);
1059 					goto done;
1060 				}
1061 			}
1062 		}
1063 		set_mime = 1;
1064 		fcgi_gen_binary_response(c, buf, len - hdrlen);
1065 
1066 		hdrlen = 0;
1067 	} while (len != 0);
1068 done:
1069 	if (commit)
1070 		got_object_commit_close(commit);
1071 	if (fd != -1 && close(fd) == -1 && error == NULL)
1072 		error = got_error_from_errno("close");
1073 	if (blob)
1074 		got_object_blob_close(blob);
1075 	free(in_repo_path);
1076 	free(commit_id);
1077 	free(path);
1078 	return error;
1079 }
1080 
1081 struct blame_line {
1082 	int annotated;
1083 	char *id_str;
1084 	char *committer;
1085 	char datebuf[11]; /* YYYY-MM-DD + NUL */
1086 };
1087 
1088 struct blame_cb_args {
1089 	struct blame_line *lines;
1090 	int nlines;
1091 	int nlines_prec;
1092 	int lineno_cur;
1093 	off_t *line_offsets;
1094 	FILE *f;
1095 	struct got_repository *repo;
1096 	struct request *c;
1097 };
1098 
1099 static const struct got_error *
1100 got_gotweb_blame_cb(void *arg, int nlines, int lineno,
1101     struct got_commit_object *commit, struct got_object_id *id)
1102 {
1103 	const struct got_error *err = NULL;
1104 	struct blame_cb_args *a = arg;
1105 	struct blame_line *bline;
1106 	struct request *c = a->c;
1107 	struct transport *t = c->t;
1108 	struct repo_dir *repo_dir = t->repo_dir;
1109 	char *line = NULL, *eline = NULL;
1110 	size_t linesize = 0;
1111 	off_t offset;
1112 	struct tm tm;
1113 	time_t committer_time;
1114 	int r;
1115 
1116 	if (nlines != a->nlines ||
1117 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
1118 		return got_error(GOT_ERR_RANGE);
1119 
1120 	if (lineno == -1)
1121 		return NULL; /* no change in this commit */
1122 
1123 	/* Annotate this line. */
1124 	bline = &a->lines[lineno - 1];
1125 	if (bline->annotated)
1126 		return NULL;
1127 	err = got_object_id_str(&bline->id_str, id);
1128 	if (err)
1129 		return err;
1130 
1131 	bline->committer = strdup(got_object_commit_get_committer(commit));
1132 	if (bline->committer == NULL) {
1133 		err = got_error_from_errno("strdup");
1134 		goto done;
1135 	}
1136 
1137 	committer_time = got_object_commit_get_committer_time(commit);
1138 	if (gmtime_r(&committer_time, &tm) == NULL)
1139 		return got_error_from_errno("gmtime_r");
1140 	if (strftime(bline->datebuf, sizeof(bline->datebuf), "%G-%m-%d",
1141 	    &tm) == 0) {
1142 		err = got_error(GOT_ERR_NO_SPACE);
1143 		goto done;
1144 	}
1145 	bline->annotated = 1;
1146 
1147 	/* Print lines annotated so far. */
1148 	bline = &a->lines[a->lineno_cur - 1];
1149 	if (!bline->annotated)
1150 		goto done;
1151 
1152 	offset = a->line_offsets[a->lineno_cur - 1];
1153 	if (fseeko(a->f, offset, SEEK_SET) == -1) {
1154 		err = got_error_from_errno("fseeko");
1155 		goto done;
1156 	}
1157 
1158 	while (a->lineno_cur <= a->nlines && bline->annotated) {
1159 		char *smallerthan, *at, *nl, *committer;
1160 		size_t len;
1161 
1162 		if (getline(&line, &linesize, a->f) == -1) {
1163 			if (ferror(a->f))
1164 				err = got_error_from_errno("getline");
1165 			break;
1166 		}
1167 
1168 		committer = bline->committer;
1169 		smallerthan = strchr(committer, '<');
1170 		if (smallerthan && smallerthan[1] != '\0')
1171 			committer = smallerthan + 1;
1172 		at = strchr(committer, '@');
1173 		if (at)
1174 			*at = '\0';
1175 		len = strlen(committer);
1176 		if (len >= 9)
1177 			committer[8] = '\0';
1178 
1179 		nl = strchr(line, '\n');
1180 		if (nl)
1181 			*nl = '\0';
1182 
1183 		err = gotweb_escape_html(&eline, line);
1184 		if (err)
1185 			goto done;
1186 
1187 		if (fcgi_printf(c, "<div class='blame_wrapper'>"
1188 		    "<div class='blame_number'>%.*d</div>"
1189 		    "<div class='blame_hash'>",
1190 		    a->nlines_prec, a->lineno_cur) == -1)
1191 			goto done;
1192 
1193 		r = gotweb_link(c, &(struct gotweb_url){
1194 			.action = DIFF,
1195 			.index_page = -1,
1196 			.page = -1,
1197 			.path = repo_dir->name,
1198 			.commit = bline->id_str,
1199 		    }, "%.8s", bline->id_str);
1200 		if (r == -1)
1201 			goto done;
1202 
1203 		r = fcgi_printf(c,
1204 		    "</div>"
1205 		    "<div class='blame_date'>%s</div>"
1206 		    "<div class='blame_author'>%s</div>"
1207 		    "<div class='blame_code'>%s</div>"
1208 		    "</div>",	/* .blame_wrapper */
1209 		    bline->datebuf,
1210 		    committer,
1211 		    eline);
1212 		if (r == -1)
1213 			goto done;
1214 
1215 		a->lineno_cur++;
1216 		bline = &a->lines[a->lineno_cur - 1];
1217 
1218 		free(eline);
1219 		eline = NULL;
1220 	}
1221 done:
1222 	free(line);
1223 	free(eline);
1224 	return err;
1225 }
1226 
1227 const struct got_error *
1228 got_output_file_blame(struct request *c)
1229 {
1230 	const struct got_error *error = NULL;
1231 	struct transport *t = c->t;
1232 	struct got_repository *repo = t->repo;
1233 	struct querystring *qs = c->t->qs;
1234 	struct got_object_id *obj_id = NULL, *commit_id = NULL;
1235 	struct got_commit_object *commit = NULL;
1236 	struct got_reflist_head refs;
1237 	struct got_blob_object *blob = NULL;
1238 	char *path = NULL, *in_repo_path = NULL;
1239 	struct blame_cb_args bca;
1240 	int i, obj_type, fd1 = -1, fd2 = -1, fd3 = -1, fd4 = -1, fd5 = -1;
1241 	int fd6 = -1;
1242 	off_t filesize;
1243 	FILE *f1 = NULL, *f2 = NULL;
1244 
1245 	TAILQ_INIT(&refs);
1246 	bca.f = NULL;
1247 	bca.lines = NULL;
1248 
1249 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1250 	    qs->folder ? "/" : "", qs->file) == -1) {
1251 		error = got_error_from_errno("asprintf");
1252 		goto done;
1253 	}
1254 
1255 	error = got_repo_map_path(&in_repo_path, repo, path);
1256 	if (error)
1257 		goto done;
1258 
1259 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1260 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1261 	if (error)
1262 		goto done;
1263 
1264 	error = got_object_open_as_commit(&commit, repo, commit_id);
1265 	if (error)
1266 		goto done;
1267 
1268 	error = got_object_id_by_path(&obj_id, repo, commit, in_repo_path);
1269 	if (error)
1270 		goto done;
1271 
1272 	error = got_object_get_type(&obj_type, repo, obj_id);
1273 	if (error)
1274 		goto done;
1275 
1276 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1277 		error = got_error(GOT_ERR_OBJ_TYPE);
1278 		goto done;
1279 	}
1280 
1281 	error = got_gotweb_openfile(&bca.f, &c->priv_fd[BLAME_FD_1], &fd1);
1282 	if (error)
1283 		goto done;
1284 
1285 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_2], &fd2);
1286 	if (error)
1287 		goto done;
1288 
1289 	error = got_object_open_as_blob(&blob, repo, obj_id, BUF, fd2);
1290 	if (error)
1291 		goto done;
1292 
1293 	error = got_object_blob_dump_to_file(&filesize, &bca.nlines,
1294 	    &bca.line_offsets, bca.f, blob);
1295 	if (error || bca.nlines == 0)
1296 		goto done;
1297 
1298 	/* Don't include \n at EOF in the blame line count. */
1299 	if (bca.line_offsets[bca.nlines - 1] == filesize)
1300 		bca.nlines--;
1301 
1302 	bca.lines = calloc(bca.nlines, sizeof(*bca.lines));
1303 	if (bca.lines == NULL) {
1304 		error = got_error_from_errno("calloc");
1305 		goto done;
1306 	}
1307 	bca.lineno_cur = 1;
1308 	bca.nlines_prec = 0;
1309 	i = bca.nlines;
1310 	while (i > 0) {
1311 		i /= 10;
1312 		bca.nlines_prec++;
1313 	}
1314 	bca.repo = repo;
1315 	bca.c = c;
1316 
1317 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_3], &fd3);
1318 	if (error)
1319 		goto done;
1320 
1321 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_4], &fd4);
1322 	if (error)
1323 		goto done;
1324 
1325 	error = got_gotweb_openfile(&f1, &c->priv_fd[BLAME_FD_5], &fd5);
1326 	if (error)
1327 		goto done;
1328 
1329 	error = got_gotweb_openfile(&f2, &c->priv_fd[BLAME_FD_6], &fd6);
1330 	if (error)
1331 		goto done;
1332 
1333 	error = got_blame(in_repo_path, commit_id, repo,
1334 	    GOT_DIFF_ALGORITHM_MYERS, got_gotweb_blame_cb, &bca, NULL, NULL,
1335 	    fd3, fd4, f1, f2);
1336 
1337 done:
1338 	if (bca.lines) {
1339 		free(bca.line_offsets);
1340 		for (i = 0; i < bca.nlines; i++) {
1341 			struct blame_line *bline = &bca.lines[i];
1342 			free(bline->id_str);
1343 			free(bline->committer);
1344 		}
1345 	}
1346 	free(bca.lines);
1347 	if (fd2 != -1 && close(fd2) == -1 && error == NULL)
1348 		error = got_error_from_errno("close");
1349 	if (fd3 != -1 && close(fd3) == -1 && error == NULL)
1350 		error = got_error_from_errno("close");
1351 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1352 		error = got_error_from_errno("close");
1353 	if (bca.f) {
1354 		const struct got_error *bca_err =
1355 		    got_gotweb_flushfile(bca.f, fd1);
1356 		if (error == NULL)
1357 			error = bca_err;
1358 	}
1359 	if (f1) {
1360 		const struct got_error *f1_err =
1361 		    got_gotweb_flushfile(f1, fd5);
1362 		if (error == NULL)
1363 			error = f1_err;
1364 	}
1365 	if (f2) {
1366 		const struct got_error *f2_err =
1367 		    got_gotweb_flushfile(f2, fd6);
1368 		if (error == NULL)
1369 			error = f2_err;
1370 	}
1371 	if (commit)
1372 		got_object_commit_close(commit);
1373 	if (blob)
1374 		got_object_blob_close(blob);
1375 	free(in_repo_path);
1376 	free(commit_id);
1377 	free(obj_id);
1378 	free(path);
1379 	got_ref_list_free(&refs);
1380 	return error;
1381 }
1382 
1383 const struct got_error *
1384 got_output_repo_diff(struct request *c)
1385 {
1386 	const struct got_error *error = NULL;
1387 	struct transport *t = c->t;
1388 	struct got_repository *repo = t->repo;
1389 	struct repo_commit *rc = NULL;
1390 	struct got_object_id *id1 = NULL, *id2 = NULL;
1391 	struct got_reflist_head refs;
1392 	FILE *f1 = NULL, *f2 = NULL, *f3 = NULL;
1393 	char *label1 = NULL, *label2 = NULL, *line = NULL;
1394 	char *newline, *eline = NULL, *color = NULL;
1395 	int obj_type, fd1, fd2, fd3, fd4 = -1, fd5 = -1;
1396 	size_t linesize = 0;
1397 	ssize_t linelen;
1398 	int wrlen = 0;
1399 
1400 	TAILQ_INIT(&refs);
1401 
1402 	error = got_gotweb_openfile(&f1, &c->priv_fd[DIFF_FD_1], &fd1);
1403 	if (error)
1404 		return error;
1405 
1406 	error = got_gotweb_openfile(&f2, &c->priv_fd[DIFF_FD_2], &fd2);
1407 	if (error)
1408 		return error;
1409 
1410 	error = got_gotweb_openfile(&f3, &c->priv_fd[DIFF_FD_3], &fd3);
1411 	if (error)
1412 		return error;
1413 
1414 	rc = TAILQ_FIRST(&t->repo_commits);
1415 
1416 	if (rc->parent_id != NULL &&
1417 	    strncmp(rc->parent_id, "/dev/null", 9) != 0) {
1418 		error = got_repo_match_object_id(&id1, &label1,
1419 		    rc->parent_id, GOT_OBJ_TYPE_ANY,
1420 		    &refs, repo);
1421 		if (error)
1422 			goto done;
1423 	}
1424 
1425 	error = got_repo_match_object_id(&id2, &label2, rc->commit_id,
1426 	    GOT_OBJ_TYPE_ANY, &refs, repo);
1427 	if (error)
1428 		goto done;
1429 
1430 	error = got_object_get_type(&obj_type, repo, id2);
1431 	if (error)
1432 		goto done;
1433 
1434 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_4], &fd4);
1435 	if (error)
1436 		goto done;
1437 
1438 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_5], &fd5);
1439 	if (error)
1440 		goto done;
1441 
1442 	switch (obj_type) {
1443 	case GOT_OBJ_TYPE_BLOB:
1444 		error = got_diff_objects_as_blobs(NULL, NULL, f1, f2, fd4, fd5,
1445 		     id1, id2, NULL, NULL, GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1446 		     repo, f3);
1447 		break;
1448 	case GOT_OBJ_TYPE_TREE:
1449 		error = got_diff_objects_as_trees(NULL, NULL, f1, f2, fd4, fd5,
1450 		    id1, id2, NULL, "", "",  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1451 		    repo, f3);
1452 		break;
1453 	case GOT_OBJ_TYPE_COMMIT:
1454 		error = got_diff_objects_as_commits(NULL, NULL, f1, f2, fd4,
1455 		    fd5, id1, id2, NULL,  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1456 		    repo, f3);
1457 		break;
1458 	default:
1459 		error = got_error(GOT_ERR_OBJ_TYPE);
1460 	}
1461 	if (error)
1462 		goto done;
1463 
1464 	if (fseek(f1, 0, SEEK_SET) == -1) {
1465 		error = got_ferror(f1, GOT_ERR_IO);
1466 		goto done;
1467 	}
1468 
1469 	if (fseek(f2, 0, SEEK_SET) == -1) {
1470 		error = got_ferror(f2, GOT_ERR_IO);
1471 		goto done;
1472 	}
1473 
1474 	if (fseek(f3, 0, SEEK_SET) == -1) {
1475 		error = got_ferror(f3, GOT_ERR_IO);
1476 		goto done;
1477 	}
1478 
1479 	while ((linelen = getline(&line, &linesize, f3)) != -1) {
1480 		if (strncmp(line, "-", 1) == 0) {
1481 			color = strdup("diff_minus");
1482 			if (color == NULL) {
1483 				error = got_error_from_errno("strdup");
1484 				goto done;
1485 			}
1486 		} else if (strncmp(line, "+", 1) == 0) {
1487 			color = strdup("diff_plus");
1488 			if (color == NULL) {
1489 				error = got_error_from_errno("strdup");
1490 				goto done;
1491 			}
1492 		} else if (strncmp(line, "@@", 2) == 0) {
1493 			color = strdup("diff_chunk_header");
1494 			if (color == NULL) {
1495 				error = got_error_from_errno("strdup");
1496 				goto done;
1497 			}
1498 		} else if (strncmp(line, "@@", 2) == 0) {
1499 			color = strdup("diff_chunk_header");
1500 			if (color == NULL) {
1501 				error = got_error_from_errno("strdup");
1502 				goto done;
1503 			}
1504 		} else if (strncmp(line, "commit +", 8) == 0) {
1505 			color = strdup("diff_meta");
1506 			if (color == NULL) {
1507 				error = got_error_from_errno("strdup");
1508 				goto done;
1509 			}
1510 		} else if (strncmp(line, "commit -", 8) == 0) {
1511 			color = strdup("diff_meta");
1512 			if (color == NULL) {
1513 				error = got_error_from_errno("strdup");
1514 				goto done;
1515 			}
1516 		} else if (strncmp(line, "blob +", 6) == 0) {
1517 			color = strdup("diff_meta");
1518 			if (color == NULL) {
1519 				error = got_error_from_errno("strdup");
1520 				goto done;
1521 			}
1522 		} else if (strncmp(line, "blob -", 6) == 0) {
1523 			color = strdup("diff_meta");
1524 			if (color == NULL) {
1525 				error = got_error_from_errno("strdup");
1526 				goto done;
1527 			}
1528 		} else if (strncmp(line, "file +", 6) == 0) {
1529 			color = strdup("diff_meta");
1530 			if (color == NULL) {
1531 				error = got_error_from_errno("strdup");
1532 				goto done;
1533 			}
1534 		} else if (strncmp(line, "file -", 6) == 0) {
1535 			color = strdup("diff_meta");
1536 			if (color == NULL) {
1537 				error = got_error_from_errno("strdup");
1538 				goto done;
1539 			}
1540 		} else if (strncmp(line, "from:", 5) == 0) {
1541 			color = strdup("diff_author");
1542 			if (color == NULL) {
1543 				error = got_error_from_errno("strdup");
1544 				goto done;
1545 			}
1546 		} else if (strncmp(line, "via:", 4) == 0) {
1547 			color = strdup("diff_author");
1548 			if (color == NULL) {
1549 				error = got_error_from_errno("strdup");
1550 				goto done;
1551 			}
1552 		} else if (strncmp(line, "date:", 5) == 0) {
1553 			color = strdup("diff_date");
1554 			if (color == NULL) {
1555 				error = got_error_from_errno("strdup");
1556 				goto done;
1557 			}
1558 		}
1559 
1560 		newline = strchr(line, '\n');
1561 		if (newline)
1562 			*newline = '\0';
1563 
1564 		error = gotweb_escape_html(&eline, line);
1565 		if (error)
1566 			goto done;
1567 
1568 		fcgi_printf(c, "<div class='diff_line %s'>%s</div>\n",
1569 		    color ? color : "", eline);
1570 		free(eline);
1571 		eline = NULL;
1572 
1573 		if (linelen > 0)
1574 			wrlen = wrlen + linelen;
1575 		free(color);
1576 		color = NULL;
1577 	}
1578 	if (linelen == -1 && ferror(f3))
1579 		error = got_error_from_errno("getline");
1580 done:
1581 	free(color);
1582 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1583 		error = got_error_from_errno("close");
1584 	if (fd5 != -1 && close(fd5) == -1 && error == NULL)
1585 		error = got_error_from_errno("close");
1586 	if (f1) {
1587 		const struct got_error *f1_err =
1588 		    got_gotweb_flushfile(f1, fd1);
1589 		if (error == NULL)
1590 			error = f1_err;
1591 	}
1592 	if (f2) {
1593 		const struct got_error *f2_err =
1594 		    got_gotweb_flushfile(f2, fd2);
1595 		if (error == NULL)
1596 			error = f2_err;
1597 	}
1598 	if (f3) {
1599 		const struct got_error *f3_err =
1600 		    got_gotweb_flushfile(f3, fd3);
1601 		if (error == NULL)
1602 			error = f3_err;
1603 	}
1604 	got_ref_list_free(&refs);
1605 	free(line);
1606 	free(eline);
1607 	free(label1);
1608 	free(label2);
1609 	free(id1);
1610 	free(id2);
1611 	return error;
1612 }
1613 
1614 static const struct got_error *
1615 got_init_repo_commit(struct repo_commit **rc)
1616 {
1617 	*rc = calloc(1, sizeof(**rc));
1618 	if (*rc == NULL)
1619 		return got_error_from_errno2("%s: calloc", __func__);
1620 
1621 	(*rc)->path = NULL;
1622 	(*rc)->refs_str = NULL;
1623 	(*rc)->commit_id = NULL;
1624 	(*rc)->committer = NULL;
1625 	(*rc)->author = NULL;
1626 	(*rc)->parent_id = NULL;
1627 	(*rc)->tree_id = NULL;
1628 	(*rc)->commit_msg = NULL;
1629 
1630 	return NULL;
1631 }
1632 
1633 static const struct got_error *
1634 got_init_repo_tag(struct repo_tag **rt)
1635 {
1636 	*rt = calloc(1, sizeof(**rt));
1637 	if (*rt == NULL)
1638 		return got_error_from_errno2("%s: calloc", __func__);
1639 
1640 	(*rt)->commit_id = NULL;
1641 	(*rt)->tag_name = NULL;
1642 	(*rt)->tag_commit = NULL;
1643 	(*rt)->commit_msg = NULL;
1644 	(*rt)->tagger = NULL;
1645 
1646 	return NULL;
1647 }