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, char *dir)
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, char *dir,
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 			s = strstr(name, "/" GOT_REF_HEAD);
231 			if (s != NULL && s[strlen(s)] == '\0')
232 				continue;
233 		}
234 		error = got_ref_resolve(&ref_id, t->repo, re->ref);
235 		if (error)
236 			return error;
237 		if (strncmp(name, "tags/", 5) == 0) {
238 			error = got_object_open_as_tag(&tag, t->repo, ref_id);
239 			if (error) {
240 				if (error->code != GOT_ERR_OBJ_TYPE) {
241 					free(ref_id);
242 					continue;
243 				}
244 				/*
245 				 * Ref points at something other
246 				 * than a tag.
247 				 */
248 				error = NULL;
249 				tag = NULL;
250 			}
251 		}
252 		cmp = got_object_id_cmp(tag ?
253 		    got_object_tag_get_object_id(tag) : ref_id, id);
254 		free(ref_id);
255 		if (tag)
256 			got_object_tag_close(tag);
257 		if (cmp != 0)
258 			continue;
259 		s = repo_commit->refs_str;
260 		if (asprintf(&repo_commit->refs_str, "%s%s%s", s ? s : "",
261 		    s ? ", " : "", name) == -1) {
262 			error = got_error_from_errno("asprintf");
263 			free(s);
264 			repo_commit->refs_str = NULL;
265 			return error;
266 		}
267 		free(s);
268 	}
269 
270 	error = got_object_id_str(&repo_commit->commit_id, id);
271 	if (error)
272 		return error;
273 
274 	error = got_object_id_str(&repo_commit->tree_id,
275 	    got_object_commit_get_tree_id(commit));
276 	if (error)
277 		return error;
278 
279 	if (qs->action == DIFF) {
280 		parent_id = STAILQ_FIRST(
281 		    got_object_commit_get_parent_ids(commit));
282 		if (parent_id != NULL) {
283 			id2 = got_object_id_dup(&parent_id->id);
284 			error = got_object_id_str(&repo_commit->parent_id, id2);
285 			if (error)
286 				return error;
287 			free(id2);
288 		} else {
289 			repo_commit->parent_id = strdup("/dev/null");
290 			if (repo_commit->parent_id == NULL) {
291 				error = got_error_from_errno("strdup");
292 				return error;
293 			}
294 		}
295 	}
296 
297 	repo_commit->committer_time =
298 	    got_object_commit_get_committer_time(commit);
299 
300 	repo_commit->author =
301 	    strdup(got_object_commit_get_author(commit));
302 	if (repo_commit->author == NULL) {
303 		error = got_error_from_errno("strdup");
304 		return error;
305 	}
306 	repo_commit->committer =
307 	    strdup(got_object_commit_get_committer(commit));
308 	if (repo_commit->committer == NULL) {
309 		error = got_error_from_errno("strdup");
310 		return error;
311 	}
312 	error = got_object_commit_get_logmsg(&commit_msg0, commit);
313 	if (error)
314 		return error;
315 
316 	commit_msg = commit_msg0;
317 	while (*commit_msg == '\n')
318 		commit_msg++;
319 
320 	repo_commit->commit_msg = strdup(commit_msg);
321 	if (repo_commit->commit_msg == NULL)
322 		error = got_error_from_errno("strdup");
323 	free(commit_msg0);
324 	return error;
325 }
326 
327 const struct got_error *
328 got_get_repo_commits(struct request *c, int limit)
329 {
330 	const struct got_error *error = NULL;
331 	struct got_object_id *id = NULL;
332 	struct got_commit_graph *graph = NULL;
333 	struct got_commit_object *commit = NULL;
334 	struct got_reflist_head refs;
335 	struct got_reference *ref;
336 	struct repo_commit *repo_commit = NULL;
337 	struct server *srv = c->srv;
338 	struct transport *t = c->t;
339 	struct got_repository *repo = t->repo;
340 	struct querystring *qs = t->qs;
341 	struct repo_dir *repo_dir = t->repo_dir;
342 	char *in_repo_path = NULL, *repo_path = NULL, *file_path = NULL;
343 	int chk_next = 0, chk_multi = 0, commit_found = 0;
344 	int obj_type, limit_chk = 0;
345 
346 	TAILQ_INIT(&refs);
347 
348 	if (qs->file != NULL && strlen(qs->file) > 0)
349 		if (asprintf(&file_path, "%s/%s", qs->folder ? qs->folder : "",
350 		    qs->file) == -1)
351 			return got_error_from_errno("asprintf");
352 
353 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
354 	    repo_dir->name) == -1)
355 		return got_error_from_errno("asprintf");
356 
357 	error = got_init_repo_commit(&repo_commit);
358 	if (error)
359 		return error;
360 
361 	/*
362 	 * XXX: jumping directly to a commit id via
363 	 * got_repo_match_object_id_prefix significantly improves performance,
364 	 * but does not allow us to create a PREVIOUS button, since commits can
365 	 * only be itereated forward. So, we have to match as we iterate from
366 	 * the headref.
367 	 */
368 	if (qs->action == BRIEFS || qs->action == COMMITS ||
369 	    (qs->action == TREE && qs->commit == NULL)) {
370 		error = got_ref_open(&ref, repo, qs->headref, 0);
371 		if (error)
372 			goto done;
373 
374 		error = got_ref_resolve(&id, repo, ref);
375 		got_ref_close(ref);
376 		if (error)
377 			goto done;
378 	} else if (qs->commit != NULL) {
379 		error = got_ref_open(&ref, repo, qs->commit, 0);
380 		if (error == NULL) {
381 			error = got_ref_resolve(&id, repo, ref);
382 			if (error)
383 				goto done;
384 			error = got_object_get_type(&obj_type, repo, id);
385 			got_ref_close(ref);
386 			if (error)
387 				goto done;
388 			if (obj_type == GOT_OBJ_TYPE_TAG) {
389 				struct got_tag_object *tag;
390 				error = got_object_open_as_tag(&tag, repo, id);
391 				if (error)
392 					goto done;
393 				if (got_object_tag_get_object_type(tag) !=
394 				    GOT_OBJ_TYPE_COMMIT) {
395 					got_object_tag_close(tag);
396 					error = got_error(GOT_ERR_OBJ_TYPE);
397 					goto done;
398 				}
399 				free(id);
400 				id = got_object_id_dup(
401 				    got_object_tag_get_object_id(tag));
402 				if (id == NULL)
403 					error = got_error_from_errno(
404 					    "got_object_id_dup");
405 				got_object_tag_close(tag);
406 				if (error)
407 					goto done;
408 			} else if (obj_type != GOT_OBJ_TYPE_COMMIT) {
409 				error = got_error(GOT_ERR_OBJ_TYPE);
410 				goto done;
411 			}
412 		}
413 		error = got_repo_match_object_id_prefix(&id, qs->commit,
414 		    GOT_OBJ_TYPE_COMMIT, repo);
415 		if (error)
416 			goto done;
417 	}
418 
419 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
420 	if (error)
421 		goto done;
422 
423 	error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name, NULL);
424 	if (error)
425 		goto done;
426 
427 	if (qs->file != NULL && strlen(qs->file) > 0) {
428 		error = got_commit_graph_open(&graph, file_path, 0);
429 		if (error)
430 			goto done;
431 	} else {
432 		error = got_commit_graph_open(&graph, in_repo_path, 0);
433 		if (error)
434 			goto done;
435 	}
436 
437 	error = got_commit_graph_iter_start(graph, id, repo, NULL, NULL);
438 	if (error)
439 		goto done;
440 
441 	for (;;) {
442 		if (limit_chk == ((limit * qs->page) - (limit - 1)) &&
443 		    commit_found == 0 && repo_commit->commit_id != NULL) {
444 			t->prev_id = strdup(repo_commit->commit_id);
445 			if (t->prev_id == NULL) {
446 				error = got_error_from_errno("strdup");
447 				goto done;
448 			}
449 		}
450 
451 		error = got_commit_graph_iter_next(&id, graph, repo, NULL,
452 		    NULL);
453 		if (error) {
454 			if (error->code == GOT_ERR_ITER_COMPLETED)
455 				error = NULL;
456 			goto done;
457 		}
458 		if (id == NULL)
459 			goto done;
460 
461 		error = got_object_open_as_commit(&commit, repo, id);
462 		if (error)
463 			goto done;
464 
465 		error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name,
466 		    NULL);
467 		if (error)
468 			goto done;
469 
470 		error = got_get_repo_commit(c, repo_commit, commit,
471 		    &refs, id);
472 		if (error)
473 			goto done;
474 
475 		if (qs->commit != NULL && commit_found == 0 && limit != 1) {
476 			if (strcmp(qs->commit, repo_commit->commit_id) == 0)
477 				commit_found = 1;
478 			else if (qs->file != NULL && strlen(qs->file) > 0 &&
479 			    qs->page == 0)
480 				commit_found = 1;
481 			else {
482 				limit_chk++;
483 				free(id);
484 				id = NULL;
485 				continue;
486 			}
487 		}
488 
489 		struct repo_commit *new_repo_commit = NULL;
490 		error = got_init_repo_commit(&new_repo_commit);
491 		if (error)
492 			goto done;
493 
494 		TAILQ_INSERT_TAIL(&t->repo_commits, new_repo_commit, entry);
495 
496 		error = got_get_repo_commit(c, new_repo_commit, commit,
497 		    &refs, id);
498 		if (error)
499 			goto done;
500 
501 		free(id);
502 		id = NULL;
503 
504 		if (limit == 1 && chk_multi == 0 &&
505 		    srv->max_commits_display != 1)
506 			commit_found = 1;
507 		else {
508 			chk_multi = 1;
509 
510 			/*
511 			 * check for one more commit before breaking,
512 			 * so we know whether to navigate through briefs
513 			 * commits and summary
514 			 */
515 			if (chk_next && (qs->action == BRIEFS ||
516 			    qs->action == COMMITS || qs->action == SUMMARY)) {
517 				t->next_id = strdup(new_repo_commit->commit_id);
518 				if (t->next_id == NULL) {
519 					error = got_error_from_errno("strdup");
520 					goto done;
521 				}
522 				if (commit) {
523 					got_object_commit_close(commit);
524 					commit = NULL;
525 				}
526 				if (t->next_id == NULL) {
527 					error = got_error_from_errno("strdup");
528 					goto done;
529 				}
530 				TAILQ_REMOVE(&t->repo_commits, new_repo_commit,
531 				    entry);
532 				gotweb_free_repo_commit(new_repo_commit);
533 				goto done;
534 			}
535 		}
536 		got_ref_list_free(&refs);
537 		if (error || (limit && --limit == 0)) {
538 			if (commit_found || (qs->file != NULL &&
539 			    strlen(qs->file) > 0))
540 				if (chk_multi == 0)
541 					break;
542 			chk_next = 1;
543 		}
544 		if (commit) {
545 			got_object_commit_close(commit);
546 			commit = NULL;
547 		}
548 	}
549 done:
550 	gotweb_free_repo_commit(repo_commit);
551 	if (commit)
552 		got_object_commit_close(commit);
553 	if (graph)
554 		got_commit_graph_close(graph);
555 	got_ref_list_free(&refs);
556 	free(file_path);
557 	free(repo_path);
558 	free(id);
559 	return error;
560 }
561 
562 const struct got_error *
563 got_get_repo_tags(struct request *c, int limit)
564 {
565 	const struct got_error *error = NULL;
566 	struct got_object_id *id = NULL;
567 	struct got_commit_object *commit = NULL;
568 	struct got_reflist_head refs;
569 	struct got_reference *ref;
570 	struct got_reflist_entry *re;
571 	struct server *srv = c->srv;
572 	struct transport *t = c->t;
573 	struct got_repository *repo = t->repo;
574 	struct querystring *qs = t->qs;
575 	struct repo_dir *repo_dir = t->repo_dir;
576 	struct got_tag_object *tag = NULL;
577 	struct repo_tag *rt = NULL, *trt = NULL;
578 	char *in_repo_path = NULL, *repo_path = NULL, *id_str = NULL;
579 	char *commit_msg = NULL, *commit_msg0 = NULL;
580 	int chk_next = 0, chk_multi = 1, commit_found = 0, c_cnt = 0;
581 
582 	TAILQ_INIT(&refs);
583 
584 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
585 	    repo_dir->name) == -1)
586 		return got_error_from_errno("asprintf");
587 
588 	if (error)
589 		return error;
590 
591 	if (qs->commit == NULL && qs->action == TAGS) {
592 		error = got_ref_open(&ref, repo, qs->headref, 0);
593 		if (error)
594 			goto err;
595 		error = got_ref_resolve(&id, repo, ref);
596 		got_ref_close(ref);
597 		if (error)
598 			goto err;
599 	} else if (qs->commit == NULL && qs->action == TAG) {
600 		error = got_error_msg(GOT_ERR_EOF, "commit id missing");
601 		goto err;
602 	} else {
603 		error = got_repo_match_object_id_prefix(&id, qs->commit,
604 		    GOT_OBJ_TYPE_COMMIT, repo);
605 		if (error)
606 			goto err;
607 	}
608 
609 	if (qs->action != SUMMARY && qs->action != TAGS) {
610 		error = got_object_open_as_commit(&commit, repo, id);
611 		if (error)
612 			goto err;
613 		error = got_object_commit_get_logmsg(&commit_msg0, commit);
614 		if (error)
615 			goto err;
616 		if (commit) {
617 			got_object_commit_close(commit);
618 			commit = NULL;
619 		}
620 	}
621 
622 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
623 	if (error)
624 		goto err;
625 
626 	error = got_ref_list(&refs, repo, "refs/tags", got_ref_cmp_tags,
627 	   repo);
628 	if (error)
629 		goto err;
630 
631 	if (limit == 1)
632 		chk_multi = 0;
633 
634 	/*
635 	 * XXX: again, see previous message about caching
636 	 */
637 
638 	TAILQ_FOREACH(re, &refs, entry) {
639 		struct repo_tag *new_repo_tag = NULL;
640 		error = got_init_repo_tag(&new_repo_tag);
641 		if (error)
642 			goto err;
643 
644 		TAILQ_INSERT_TAIL(&t->repo_tags, new_repo_tag, entry);
645 
646 		new_repo_tag->tag_name = strdup(got_ref_get_name(re->ref));
647 		if (new_repo_tag->tag_name == NULL) {
648 			error = got_error_from_errno("strdup");
649 			goto err;
650 		}
651 
652 		error = got_ref_resolve(&id, repo, re->ref);
653 		if (error)
654 			goto done;
655 
656 		error = got_object_open_as_tag(&tag, repo, id);
657 		if (error) {
658 			if (error->code != GOT_ERR_OBJ_TYPE) {
659 				free(id);
660 				id = NULL;
661 				goto done;
662 			}
663 			/* "lightweight" tag */
664 			error = got_object_open_as_commit(&commit, repo, id);
665 			if (error) {
666 				free(id);
667 				id = NULL;
668 				goto done;
669 			}
670 			new_repo_tag->tagger =
671 			    strdup(got_object_commit_get_committer(commit));
672 			if (new_repo_tag->tagger == NULL) {
673 				error = got_error_from_errno("strdup");
674 				goto err;
675 			}
676 			new_repo_tag->tagger_time =
677 			    got_object_commit_get_committer_time(commit);
678 			error = got_object_id_str(&id_str, id);
679 			if (error)
680 				goto err;
681 			free(id);
682 			id = NULL;
683 		} else {
684 			free(id);
685 			id = NULL;
686 			new_repo_tag->tagger =
687 			    strdup(got_object_tag_get_tagger(tag));
688 			if (new_repo_tag->tagger == NULL) {
689 				error = got_error_from_errno("strdup");
690 				goto err;
691 			}
692 			new_repo_tag->tagger_time =
693 			    got_object_tag_get_tagger_time(tag);
694 			error = got_object_id_str(&id_str,
695 			    got_object_tag_get_object_id(tag));
696 			if (error)
697 				goto err;
698 		}
699 
700 		new_repo_tag->commit_id = strdup(id_str);
701 		if (new_repo_tag->commit_id == NULL)
702 			goto err;
703 
704 		if (commit_found == 0 && qs->commit != NULL &&
705 		    strncmp(id_str, qs->commit, strlen(id_str)) != 0)
706 			continue;
707 		else
708 			commit_found = 1;
709 
710 		t->tag_count++;
711 
712 		/*
713 		 * check for one more commit before breaking,
714 		 * so we know whether to navigate through briefs
715 		 * commits and summary
716 		 */
717 		if (chk_next) {
718 			t->next_id = strdup(new_repo_tag->commit_id);
719 			if (t->next_id == NULL) {
720 				error = got_error_from_errno("strdup");
721 				goto err;
722 			}
723 			if (commit) {
724 				got_object_commit_close(commit);
725 				commit = NULL;
726 			}
727 			if (t->next_id == NULL) {
728 				error = got_error_from_errno("strdup");
729 				goto err;
730 			}
731 			TAILQ_REMOVE(&t->repo_tags, new_repo_tag, entry);
732 			gotweb_free_repo_tag(new_repo_tag);
733 			goto done;
734 		}
735 
736 		if (commit) {
737 			error = got_object_commit_get_logmsg(&new_repo_tag->
738 			    tag_commit, commit);
739 			if (error)
740 				goto done;
741 			got_object_commit_close(commit);
742 			commit = NULL;
743 		} else {
744 			new_repo_tag->tag_commit =
745 			    strdup(got_object_tag_get_message(tag));
746 			if (new_repo_tag->tag_commit == NULL) {
747 				error = got_error_from_errno("strdup");
748 				goto done;
749 			}
750 		}
751 
752 		while (*new_repo_tag->tag_commit == '\n')
753 			new_repo_tag->tag_commit++;
754 
755 		if (qs->action != SUMMARY && qs->action != TAGS) {
756 			commit_msg = commit_msg0;
757 			while (*commit_msg == '\n')
758 				commit_msg++;
759 
760 			new_repo_tag->commit_msg = strdup(commit_msg);
761 			if (new_repo_tag->commit_msg == NULL) {
762 				error = got_error_from_errno("strdup");
763 				free(commit_msg0);
764 				goto err;
765 			}
766 			free(commit_msg0);
767 		}
768 
769 		if (limit && --limit == 0) {
770 			if (chk_multi == 0)
771 				break;
772 			chk_next = 1;
773 		}
774 		free(id);
775 		id = NULL;
776 	}
777 
778 done:
779 	/*
780 	 * we have tailq populated, so find previous commit id
781 	 * for navigation through briefs and commits
782 	 */
783 	if (t->tag_count == 0) {
784 		TAILQ_FOREACH_SAFE(rt, &t->repo_tags, entry, trt) {
785 			TAILQ_REMOVE(&t->repo_tags, rt, entry);
786 			gotweb_free_repo_tag(rt);
787 		}
788 	}
789 	if (t->tag_count > 0 && t->prev_id == NULL && qs->commit != NULL) {
790 		commit_found = 0;
791 		TAILQ_FOREACH_REVERSE(rt, &t->repo_tags, repo_tags_head,
792 		    entry) {
793 			if (commit_found == 0 && rt->commit_id != NULL &&
794 			    strcmp(qs->commit, rt->commit_id) != 0) {
795 				continue;
796 			} else
797 				commit_found = 1;
798 			if (c_cnt == srv->max_commits_display ||
799 			    rt == TAILQ_FIRST(&t->repo_tags)) {
800 				t->prev_id = strdup(rt->commit_id);
801 				if (t->prev_id == NULL)
802 					error = got_error_from_errno("strdup");
803 				break;
804 			}
805 			c_cnt++;
806 		}
807 	}
808 err:
809 	if (commit)
810 		got_object_commit_close(commit);
811 	got_ref_list_free(&refs);
812 	free(repo_path);
813 	free(id);
814 	return error;
815 }
816 
817 const struct got_error *
818 got_output_repo_tree(struct request *c)
819 {
820 	const struct got_error *error = NULL;
821 	struct transport *t = c->t;
822 	struct got_commit_object *commit = NULL;
823 	struct got_repository *repo = t->repo;
824 	struct querystring *qs = t->qs;
825 	struct repo_commit *rc = NULL;
826 	struct got_object_id *tree_id = NULL, *commit_id = NULL;
827 	struct got_reflist_head refs;
828 	struct got_tree_object *tree = NULL;
829 	struct repo_dir *repo_dir = t->repo_dir;
830 	const char *name, *index_page_str, *folder;
831 	char *id_str = NULL, *escaped_name = NULL;
832 	char *path = NULL, *in_repo_path = NULL, *modestr = NULL;
833 	int nentries, i, r;
834 
835 	TAILQ_INIT(&refs);
836 
837 	rc = TAILQ_FIRST(&t->repo_commits);
838 
839 	if (qs->folder != NULL) {
840 		path = strdup(qs->folder);
841 		if (path == NULL) {
842 			error = got_error_from_errno("strdup");
843 			goto done;
844 		}
845 	} else {
846 		error = got_repo_map_path(&in_repo_path, repo, repo_dir->path);
847 		if (error)
848 			goto done;
849 		free(path);
850 		path = in_repo_path;
851 	}
852 
853 	error = got_repo_match_object_id(&commit_id, NULL, rc->commit_id,
854 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
855 	if (error)
856 		goto done;
857 
858 	error = got_object_open_as_commit(&commit, repo, commit_id);
859 	if (error)
860 		goto done;
861 
862 	error = got_object_id_by_path(&tree_id, repo, commit, path);
863 	if (error)
864 		goto done;
865 
866 	error = got_object_open_as_tree(&tree, repo, tree_id);
867 	if (error)
868 		goto done;
869 
870 	nentries = got_object_tree_get_nentries(tree);
871 
872 	index_page_str = qs->index_page_str ? qs->index_page_str : "";
873 	folder = qs->folder ? qs->folder : "";
874 
875 	for (i = 0; i < nentries; i++) {
876 		struct got_tree_entry *te;
877 		mode_t mode;
878 
879 		te = got_object_tree_get_entry(tree, i);
880 
881 		error = got_object_id_str(&id_str, got_tree_entry_get_id(te));
882 		if (error)
883 			goto done;
884 
885 		modestr = strdup("");
886 		if (modestr == NULL) {
887 			error = got_error_from_errno("strdup");
888 			goto done;
889 		}
890 		mode = got_tree_entry_get_mode(te);
891 		if (got_object_tree_entry_is_submodule(te)) {
892 			free(modestr);
893 			modestr = strdup("$");
894 			if (modestr == NULL) {
895 				error = got_error_from_errno("strdup");
896 				goto done;
897 			}
898 		} else if (S_ISLNK(mode)) {
899 			free(modestr);
900 			modestr = strdup("@");
901 			if (modestr == NULL) {
902 				error = got_error_from_errno("strdup");
903 				goto done;
904 			}
905 		} else if (S_ISDIR(mode)) {
906 			free(modestr);
907 			modestr = strdup("/");
908 			if (modestr == NULL) {
909 				error = got_error_from_errno("strdup");
910 				goto done;
911 			}
912 		} else if (mode & S_IXUSR) {
913 			free(modestr);
914 			modestr = strdup("*");
915 			if (modestr == NULL) {
916 				error = got_error_from_errno("strdup");
917 				goto done;
918 			}
919 		}
920 
921 		name = got_tree_entry_get_name(te);
922 		error = gotweb_escape_html(&escaped_name, name);
923 		if (error)
924 			goto done;
925 
926 		if (S_ISDIR(mode)) {
927 			r = fcgi_printf(c,
928 			    "<div class='tree_wrapper'>\n"
929 			    "<div class='tree_line'>"
930 			    "<a class='diff_directory' "
931 			    "href='?index_page=%s&path=%s&action=tree"
932 			    "&commit=%s&folder=%s/%s'>%s%s</a>"
933 			    "</div>\n" /* .tree_line */
934 			    "<div class='tree_line_blank'>&nbsp;</div>\n"
935 			    "</div>\n", /* .tree_wrapper */
936 			    index_page_str, qs->path, rc->commit_id,
937 			    folder, name, escaped_name, modestr);
938 			if (r == -1)
939 				goto done;
940 		} else {
941 			r = fcgi_printf(c,
942 			    "<div class='tree_wrapper'>\n"
943 			    "<div class='tree_line'>"
944 			    "<a href='?index_page=%s&path=%s&action=blob"
945 			    "&commit=%s&folder=%s&file=%s'>%s%s</a>"
946 			    "</div>\n" /* .tree_line */
947 			    "<div class='tree_line_blank'>"
948 			    "<a href='?index_page=%s&path=%s&action=commits"
949 			    "&commit=%s&folder=%s&file=%s'>commits</a>\n"
950 			    " | \n"
951 			    "<a href='?index_page=%s&path=%s&action=blame"
952 			    "&commit=%s&folder=%s&file=%s'>blame</a>\n"
953 			    "</div>\n"  /* .tree_line_blank */
954 			    "</div>\n", /* .tree_wrapper */
955 			    index_page_str, qs->path, rc->commit_id,
956 			    folder, name, escaped_name, modestr,
957 			    index_page_str, qs->path, rc->commit_id,
958 			    folder, name,
959 			    index_page_str, qs->path, rc->commit_id,
960 			    folder, name);
961 			if (r == -1)
962 				goto done;
963 		}
964 		free(id_str);
965 		id_str = NULL;
966 		free(modestr);
967 		modestr = NULL;
968 		free(escaped_name);
969 		escaped_name = NULL;
970 	}
971 done:
972 	free(escaped_name);
973 	free(id_str);
974 	free(modestr);
975 	free(path);
976 	got_ref_list_free(&refs);
977 	if (commit)
978 		got_object_commit_close(commit);
979 	free(commit_id);
980 	free(tree_id);
981 	return error;
982 }
983 
984 const struct got_error *
985 got_output_file_blob(struct request *c)
986 {
987 	const struct got_error *error = NULL;
988 	struct transport *t = c->t;
989 	struct got_repository *repo = t->repo;
990 	struct querystring *qs = c->t->qs;
991 	struct got_commit_object *commit = NULL;
992 	struct got_object_id *commit_id = NULL;
993 	struct got_reflist_head refs;
994 	struct got_blob_object *blob = NULL;
995 	char *path = NULL, *in_repo_path = NULL;
996 	int obj_type, set_mime = 0, fd = -1;
997 	size_t len, hdrlen;
998 	const uint8_t *buf;
999 
1000 	TAILQ_INIT(&refs);
1001 
1002 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1003 	    qs->folder ? "/" : "", qs->file) == -1) {
1004 		error = got_error_from_errno("asprintf");
1005 		goto done;
1006 	}
1007 
1008 	error = got_repo_map_path(&in_repo_path, repo, path);
1009 	if (error)
1010 		goto done;
1011 
1012 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1013 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1014 	if (error)
1015 		goto done;
1016 
1017 	error = got_object_open_as_commit(&commit, repo, commit_id);
1018 	if (error)
1019 		goto done;
1020 
1021 	error = got_object_id_by_path(&commit_id, repo, commit, in_repo_path);
1022 	if (error)
1023 		goto done;
1024 
1025 	if (commit_id == NULL) {
1026 		error = got_error(GOT_ERR_NO_OBJ);
1027 		goto done;
1028 	}
1029 
1030 	error = got_object_get_type(&obj_type, repo, commit_id);
1031 	if (error)
1032 		goto done;
1033 
1034 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1035 		error = got_error(GOT_ERR_OBJ_TYPE);
1036 		goto done;
1037 	}
1038 
1039 	error = got_gotweb_dupfd(&c->priv_fd[BLOB_FD_1], &fd);
1040 	if (error)
1041 		goto done;
1042 
1043 	error = got_object_open_as_blob(&blob, repo, commit_id, BUF, fd);
1044 	if (error)
1045 		goto done;
1046 	hdrlen = got_object_blob_get_hdrlen(blob);
1047 	do {
1048 		error = got_object_blob_read_block(&len, blob);
1049 		if (error)
1050 			goto done;
1051 		buf = got_object_blob_get_read_buf(blob);
1052 
1053 		/*
1054 		 * Skip blob object header first time around,
1055 		 * which also contains a zero byte.
1056 		 */
1057 		buf += hdrlen;
1058 		if (set_mime == 0) {
1059 			if (isbinary(buf, len - hdrlen)) {
1060 				error = gotweb_render_content_type_file(c,
1061 				    "application/octet-stream",
1062 				    qs->file);
1063 				if (error) {
1064 					log_warnx("%s: %s", __func__,
1065 					    error->msg);
1066 					goto done;
1067 				}
1068 			} else {
1069 				error = gotweb_render_content_type(c,
1070 				  "text/plain");
1071 				if (error) {
1072 					log_warnx("%s: %s", __func__,
1073 					    error->msg);
1074 					goto done;
1075 				}
1076 			}
1077 		}
1078 		set_mime = 1;
1079 		fcgi_gen_binary_response(c, buf, len - hdrlen);
1080 
1081 		hdrlen = 0;
1082 	} while (len != 0);
1083 done:
1084 	if (commit)
1085 		got_object_commit_close(commit);
1086 	if (fd != -1 && close(fd) == -1 && error == NULL)
1087 		error = got_error_from_errno("close");
1088 	if (blob)
1089 		got_object_blob_close(blob);
1090 	free(in_repo_path);
1091 	free(commit_id);
1092 	free(path);
1093 	return error;
1094 }
1095 
1096 struct blame_line {
1097 	int annotated;
1098 	char *id_str;
1099 	char *committer;
1100 	char datebuf[11]; /* YYYY-MM-DD + NUL */
1101 };
1102 
1103 struct blame_cb_args {
1104 	struct blame_line *lines;
1105 	int nlines;
1106 	int nlines_prec;
1107 	int lineno_cur;
1108 	off_t *line_offsets;
1109 	FILE *f;
1110 	struct got_repository *repo;
1111 	struct request *c;
1112 };
1113 
1114 static const struct got_error *
1115 got_gotweb_blame_cb(void *arg, int nlines, int lineno,
1116     struct got_commit_object *commit, struct got_object_id *id)
1117 {
1118 	const struct got_error *err = NULL;
1119 	struct blame_cb_args *a = arg;
1120 	struct blame_line *bline;
1121 	struct request *c = a->c;
1122 	struct transport *t = c->t;
1123 	struct querystring *qs = t->qs;
1124 	struct repo_dir *repo_dir = t->repo_dir;
1125 	const char *index_page_str;
1126 	char *line = NULL, *eline = NULL;
1127 	size_t linesize = 0;
1128 	off_t offset;
1129 	struct tm tm;
1130 	time_t committer_time;
1131 	int r;
1132 
1133 	if (nlines != a->nlines ||
1134 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
1135 		return got_error(GOT_ERR_RANGE);
1136 
1137 	if (lineno == -1)
1138 		return NULL; /* no change in this commit */
1139 
1140 	/* Annotate this line. */
1141 	bline = &a->lines[lineno - 1];
1142 	if (bline->annotated)
1143 		return NULL;
1144 	err = got_object_id_str(&bline->id_str, id);
1145 	if (err)
1146 		return err;
1147 
1148 	bline->committer = strdup(got_object_commit_get_committer(commit));
1149 	if (bline->committer == NULL) {
1150 		err = got_error_from_errno("strdup");
1151 		goto done;
1152 	}
1153 
1154 	committer_time = got_object_commit_get_committer_time(commit);
1155 	if (gmtime_r(&committer_time, &tm) == NULL)
1156 		return got_error_from_errno("gmtime_r");
1157 	if (strftime(bline->datebuf, sizeof(bline->datebuf), "%G-%m-%d",
1158 	    &tm) == 0) {
1159 		err = got_error(GOT_ERR_NO_SPACE);
1160 		goto done;
1161 	}
1162 	bline->annotated = 1;
1163 
1164 	/* Print lines annotated so far. */
1165 	bline = &a->lines[a->lineno_cur - 1];
1166 	if (!bline->annotated)
1167 		goto done;
1168 
1169 	offset = a->line_offsets[a->lineno_cur - 1];
1170 	if (fseeko(a->f, offset, SEEK_SET) == -1) {
1171 		err = got_error_from_errno("fseeko");
1172 		goto done;
1173 	}
1174 
1175 	index_page_str = qs->index_page_str ? qs->index_page_str : "";
1176 
1177 	while (a->lineno_cur <= a->nlines && bline->annotated) {
1178 		char *smallerthan, *at, *nl, *committer;
1179 		size_t len;
1180 
1181 		if (getline(&line, &linesize, a->f) == -1) {
1182 			if (ferror(a->f))
1183 				err = got_error_from_errno("getline");
1184 			break;
1185 		}
1186 
1187 		committer = bline->committer;
1188 		smallerthan = strchr(committer, '<');
1189 		if (smallerthan && smallerthan[1] != '\0')
1190 			committer = smallerthan + 1;
1191 		at = strchr(committer, '@');
1192 		if (at)
1193 			*at = '\0';
1194 		len = strlen(committer);
1195 		if (len >= 9)
1196 			committer[8] = '\0';
1197 
1198 		nl = strchr(line, '\n');
1199 		if (nl)
1200 			*nl = '\0';
1201 
1202 		err = gotweb_escape_html(&eline, line);
1203 		if (err)
1204 			goto done;
1205 
1206 		r = fcgi_printf(c, "<div class='blame_wrapper'>"
1207 		    "<div class='blame_number'>%.*d</div>"
1208 		    "<div class='blame_hash'>"
1209 		    "<a href='?index_page=%s&path=%s&action=diff&commit=%s'>"
1210 		    "%.8s</a>"
1211 		    "</div>"
1212 		    "<div class='blame_date'>%s</div>"
1213 		    "<div class='blame_author'>%s</div>"
1214 		    "<div class='blame_code'>%s</div>"
1215 		    "</div>",	/* .blame_wrapper */
1216 		    a->nlines_prec, a->lineno_cur,
1217 		    index_page_str, repo_dir->name, bline->id_str,
1218 		    bline->id_str,
1219 		    bline->datebuf,
1220 		    committer,
1221 		    eline);
1222 		if (r == -1)
1223 			goto done;
1224 
1225 		a->lineno_cur++;
1226 		bline = &a->lines[a->lineno_cur - 1];
1227 	}
1228 done:
1229 	free(line);
1230 	free(eline);
1231 	return err;
1232 }
1233 
1234 const struct got_error *
1235 got_output_file_blame(struct request *c)
1236 {
1237 	const struct got_error *error = NULL;
1238 	struct transport *t = c->t;
1239 	struct got_repository *repo = t->repo;
1240 	struct querystring *qs = c->t->qs;
1241 	struct got_object_id *obj_id = NULL, *commit_id = NULL;
1242 	struct got_commit_object *commit = NULL;
1243 	struct got_reflist_head refs;
1244 	struct got_blob_object *blob = NULL;
1245 	char *path = NULL, *in_repo_path = NULL;
1246 	struct blame_cb_args bca;
1247 	int i, obj_type, fd1 = -1, fd2 = -1, fd3 = -1, fd4 = -1, fd5 = -1;
1248 	int fd6 = -1;
1249 	off_t filesize;
1250 	FILE *f1 = NULL, *f2 = NULL;
1251 
1252 	TAILQ_INIT(&refs);
1253 	bca.f = NULL;
1254 	bca.lines = NULL;
1255 
1256 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1257 	    qs->folder ? "/" : "", qs->file) == -1) {
1258 		error = got_error_from_errno("asprintf");
1259 		goto done;
1260 	}
1261 
1262 	error = got_repo_map_path(&in_repo_path, repo, path);
1263 	if (error)
1264 		goto done;
1265 
1266 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1267 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1268 	if (error)
1269 		goto done;
1270 
1271 	error = got_object_open_as_commit(&commit, repo, commit_id);
1272 	if (error)
1273 		goto done;
1274 
1275 	error = got_object_id_by_path(&obj_id, repo, commit, in_repo_path);
1276 	if (error)
1277 		goto done;
1278 
1279 	if (commit_id == NULL) {
1280 		error = got_error(GOT_ERR_NO_OBJ);
1281 		goto done;
1282 	}
1283 
1284 	error = got_object_get_type(&obj_type, repo, obj_id);
1285 	if (error)
1286 		goto done;
1287 
1288 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1289 		error = got_error(GOT_ERR_OBJ_TYPE);
1290 		goto done;
1291 	}
1292 
1293 	error = got_gotweb_openfile(&bca.f, &c->priv_fd[BLAME_FD_1], &fd1);
1294 	if (error)
1295 		goto done;
1296 
1297 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_2], &fd2);
1298 	if (error)
1299 		goto done;
1300 
1301 	error = got_object_open_as_blob(&blob, repo, obj_id, BUF, fd2);
1302 	if (error)
1303 		goto done;
1304 
1305 	error = got_object_blob_dump_to_file(&filesize, &bca.nlines,
1306 	    &bca.line_offsets, bca.f, blob);
1307 	if (error || bca.nlines == 0)
1308 		goto done;
1309 
1310 	/* Don't include \n at EOF in the blame line count. */
1311 	if (bca.line_offsets[bca.nlines - 1] == filesize)
1312 		bca.nlines--;
1313 
1314 	bca.lines = calloc(bca.nlines, sizeof(*bca.lines));
1315 	if (bca.lines == NULL) {
1316 		error = got_error_from_errno("calloc");
1317 		goto done;
1318 	}
1319 	bca.lineno_cur = 1;
1320 	bca.nlines_prec = 0;
1321 	i = bca.nlines;
1322 	while (i > 0) {
1323 		i /= 10;
1324 		bca.nlines_prec++;
1325 	}
1326 	bca.repo = repo;
1327 	bca.c = c;
1328 
1329 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_3], &fd3);
1330 	if (error)
1331 		goto done;
1332 
1333 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_4], &fd4);
1334 	if (error)
1335 		goto done;
1336 
1337 	error = got_gotweb_openfile(&f1, &c->priv_fd[BLAME_FD_5], &fd5);
1338 	if (error)
1339 		goto done;
1340 
1341 	error = got_gotweb_openfile(&f2, &c->priv_fd[BLAME_FD_6], &fd6);
1342 	if (error)
1343 		goto done;
1344 
1345 	error = got_blame(in_repo_path, commit_id, repo,
1346 	    GOT_DIFF_ALGORITHM_MYERS, got_gotweb_blame_cb, &bca, NULL, NULL,
1347 	    fd3, fd4, f1, f2);
1348 
1349 	if (blob) {
1350 		free(bca.line_offsets);
1351 		for (i = 0; i < bca.nlines; i++) {
1352 			struct blame_line *bline = &bca.lines[i];
1353 			free(bline->id_str);
1354 			free(bline->committer);
1355 		}
1356 	}
1357 done:
1358 	free(bca.lines);
1359 	if (fd2 != -1 && close(fd2) == -1 && error == NULL)
1360 		error = got_error_from_errno("close");
1361 	if (fd3 != -1 && close(fd3) == -1 && error == NULL)
1362 		error = got_error_from_errno("close");
1363 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1364 		error = got_error_from_errno("close");
1365 	if (bca.f) {
1366 		const struct got_error *bca_err =
1367 		    got_gotweb_flushfile(bca.f, fd1);
1368 		if (error == NULL)
1369 			error = bca_err;
1370 	}
1371 	if (f1) {
1372 		const struct got_error *f1_err =
1373 		    got_gotweb_flushfile(f1, fd5);
1374 		if (error == NULL)
1375 			error = f1_err;
1376 	}
1377 	if (f2) {
1378 		const struct got_error *f2_err =
1379 		    got_gotweb_flushfile(f2, fd6);
1380 		if (error == NULL)
1381 			error = f2_err;
1382 	}
1383 	if (commit)
1384 		got_object_commit_close(commit);
1385 	if (blob)
1386 		got_object_blob_close(blob);
1387 	free(in_repo_path);
1388 	free(commit_id);
1389 	free(path);
1390 	return error;
1391 }
1392 
1393 const struct got_error *
1394 got_output_repo_diff(struct request *c)
1395 {
1396 	const struct got_error *error = NULL;
1397 	struct transport *t = c->t;
1398 	struct got_repository *repo = t->repo;
1399 	struct repo_commit *rc = NULL;
1400 	struct got_object_id *id1 = NULL, *id2 = NULL;
1401 	struct got_reflist_head refs;
1402 	FILE *f1 = NULL, *f2 = NULL, *f3 = NULL;
1403 	char *label1 = NULL, *label2 = NULL, *line = NULL;
1404 	char *newline, *eline = NULL, *color = NULL;
1405 	int obj_type, fd1, fd2, fd3, fd4 = -1, fd5 = -1;
1406 	size_t linesize = 0;
1407 	ssize_t linelen;
1408 	int wrlen = 0;
1409 
1410 	TAILQ_INIT(&refs);
1411 
1412 	error = got_gotweb_openfile(&f1, &c->priv_fd[DIFF_FD_1], &fd1);
1413 	if (error)
1414 		return error;
1415 
1416 	error = got_gotweb_openfile(&f2, &c->priv_fd[DIFF_FD_2], &fd2);
1417 	if (error)
1418 		return error;
1419 
1420 	error = got_gotweb_openfile(&f3, &c->priv_fd[DIFF_FD_3], &fd3);
1421 	if (error)
1422 		return error;
1423 
1424 	rc = TAILQ_FIRST(&t->repo_commits);
1425 
1426 	if (rc->parent_id != NULL &&
1427 	    strncmp(rc->parent_id, "/dev/null", 9) != 0) {
1428 		error = got_repo_match_object_id(&id1, &label1,
1429 		    rc->parent_id, GOT_OBJ_TYPE_ANY,
1430 		    &refs, repo);
1431 		if (error)
1432 			goto done;
1433 	}
1434 
1435 	error = got_repo_match_object_id(&id2, &label2, rc->commit_id,
1436 	    GOT_OBJ_TYPE_ANY, &refs, repo);
1437 	if (error)
1438 		goto done;
1439 
1440 	error = got_object_get_type(&obj_type, repo, id2);
1441 	if (error)
1442 		goto done;
1443 
1444 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_4], &fd4);
1445 	if (error)
1446 		goto done;
1447 
1448 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_5], &fd5);
1449 	if (error)
1450 		goto done;
1451 
1452 	switch (obj_type) {
1453 	case GOT_OBJ_TYPE_BLOB:
1454 		error = got_diff_objects_as_blobs(NULL, NULL, f1, f2, fd4, fd5,
1455 		     id1, id2, NULL, NULL, GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1456 		     repo, f3);
1457 		break;
1458 	case GOT_OBJ_TYPE_TREE:
1459 		error = got_diff_objects_as_trees(NULL, NULL, f1, f2, fd4, fd5,
1460 		    id1, id2, NULL, "", "",  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1461 		    repo, f3);
1462 		break;
1463 	case GOT_OBJ_TYPE_COMMIT:
1464 		error = got_diff_objects_as_commits(NULL, NULL, f1, f2, fd4,
1465 		    fd5, id1, id2, NULL,  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1466 		    repo, f3);
1467 		break;
1468 	default:
1469 		error = got_error(GOT_ERR_OBJ_TYPE);
1470 	}
1471 	if (error)
1472 		goto done;
1473 
1474 	if (fseek(f1, 0, SEEK_SET) == -1) {
1475 		error = got_ferror(f1, GOT_ERR_IO);
1476 		goto done;
1477 	}
1478 
1479 	if (fseek(f2, 0, SEEK_SET) == -1) {
1480 		error = got_ferror(f2, GOT_ERR_IO);
1481 		goto done;
1482 	}
1483 
1484 	if (fseek(f3, 0, SEEK_SET) == -1) {
1485 		error = got_ferror(f3, GOT_ERR_IO);
1486 		goto done;
1487 	}
1488 
1489 	while ((linelen = getline(&line, &linesize, f3)) != -1) {
1490 		if (strncmp(line, "-", 1) == 0) {
1491 			color = strdup("diff_minus");
1492 			if (color == NULL) {
1493 				error = got_error_from_errno("strdup");
1494 				goto done;
1495 			}
1496 		} else if (strncmp(line, "+", 1) == 0) {
1497 			color = strdup("diff_plus");
1498 			if (color == NULL) {
1499 				error = got_error_from_errno("strdup");
1500 				goto done;
1501 			}
1502 		} else if (strncmp(line, "@@", 2) == 0) {
1503 			color = strdup("diff_chunk_header");
1504 			if (color == NULL) {
1505 				error = got_error_from_errno("strdup");
1506 				goto done;
1507 			}
1508 		} else if (strncmp(line, "@@", 2) == 0) {
1509 			color = strdup("diff_chunk_header");
1510 			if (color == NULL) {
1511 				error = got_error_from_errno("strdup");
1512 				goto done;
1513 			}
1514 		} else if (strncmp(line, "commit +", 8) == 0) {
1515 			color = strdup("diff_meta");
1516 			if (color == NULL) {
1517 				error = got_error_from_errno("strdup");
1518 				goto done;
1519 			}
1520 		} else if (strncmp(line, "commit -", 8) == 0) {
1521 			color = strdup("diff_meta");
1522 			if (color == NULL) {
1523 				error = got_error_from_errno("strdup");
1524 				goto done;
1525 			}
1526 		} else if (strncmp(line, "blob +", 6) == 0) {
1527 			color = strdup("diff_meta");
1528 			if (color == NULL) {
1529 				error = got_error_from_errno("strdup");
1530 				goto done;
1531 			}
1532 		} else if (strncmp(line, "blob -", 6) == 0) {
1533 			color = strdup("diff_meta");
1534 			if (color == NULL) {
1535 				error = got_error_from_errno("strdup");
1536 				goto done;
1537 			}
1538 		} else if (strncmp(line, "file +", 6) == 0) {
1539 			color = strdup("diff_meta");
1540 			if (color == NULL) {
1541 				error = got_error_from_errno("strdup");
1542 				goto done;
1543 			}
1544 		} else if (strncmp(line, "file -", 6) == 0) {
1545 			color = strdup("diff_meta");
1546 			if (color == NULL) {
1547 				error = got_error_from_errno("strdup");
1548 				goto done;
1549 			}
1550 		} else if (strncmp(line, "from:", 5) == 0) {
1551 			color = strdup("diff_author");
1552 			if (color == NULL) {
1553 				error = got_error_from_errno("strdup");
1554 				goto done;
1555 			}
1556 		} else if (strncmp(line, "via:", 4) == 0) {
1557 			color = strdup("diff_author");
1558 			if (color == NULL) {
1559 				error = got_error_from_errno("strdup");
1560 				goto done;
1561 			}
1562 		} else if (strncmp(line, "date:", 5) == 0) {
1563 			color = strdup("diff_date");
1564 			if (color == NULL) {
1565 				error = got_error_from_errno("strdup");
1566 				goto done;
1567 			}
1568 		}
1569 
1570 		newline = strchr(line, '\n');
1571 		if (newline)
1572 			*newline = '\0';
1573 
1574 		error = gotweb_escape_html(&eline, line);
1575 		if (error)
1576 			goto done;
1577 
1578 		fcgi_printf(c, "<div class='diff_line %s'>%s</div>\n",
1579 		    color ? color : "", eline);
1580 		free(eline);
1581 		eline = NULL;
1582 
1583 		if (linelen > 0)
1584 			wrlen = wrlen + linelen;
1585 		free(color);
1586 		color = NULL;
1587 	}
1588 	if (linelen == -1 && ferror(f3))
1589 		error = got_error_from_errno("getline");
1590 done:
1591 	free(color);
1592 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1593 		error = got_error_from_errno("close");
1594 	if (fd5 != -1 && close(fd5) == -1 && error == NULL)
1595 		error = got_error_from_errno("close");
1596 	if (f1) {
1597 		const struct got_error *f1_err =
1598 		    got_gotweb_flushfile(f1, fd1);
1599 		if (error == NULL)
1600 			error = f1_err;
1601 	}
1602 	if (f2) {
1603 		const struct got_error *f2_err =
1604 		    got_gotweb_flushfile(f2, fd2);
1605 		if (error == NULL)
1606 			error = f2_err;
1607 	}
1608 	if (f3) {
1609 		const struct got_error *f3_err =
1610 		    got_gotweb_flushfile(f3, fd3);
1611 		if (error == NULL)
1612 			error = f3_err;
1613 	}
1614 	got_ref_list_free(&refs);
1615 	free(line);
1616 	free(eline);
1617 	free(label1);
1618 	free(label2);
1619 	free(id1);
1620 	free(id2);
1621 	return error;
1622 }
1623 
1624 static const struct got_error *
1625 got_init_repo_commit(struct repo_commit **rc)
1626 {
1627 	*rc = calloc(1, sizeof(**rc));
1628 	if (*rc == NULL)
1629 		return got_error_from_errno2("%s: calloc", __func__);
1630 
1631 	(*rc)->path = NULL;
1632 	(*rc)->refs_str = NULL;
1633 	(*rc)->commit_id = NULL;
1634 	(*rc)->committer = NULL;
1635 	(*rc)->author = NULL;
1636 	(*rc)->parent_id = NULL;
1637 	(*rc)->tree_id = NULL;
1638 	(*rc)->commit_msg = NULL;
1639 
1640 	return NULL;
1641 }
1642 
1643 static const struct got_error *
1644 got_init_repo_tag(struct repo_tag **rt)
1645 {
1646 	*rt = calloc(1, sizeof(**rt));
1647 	if (*rt == NULL)
1648 		return got_error_from_errno2("%s: calloc", __func__);
1649 
1650 	(*rt)->commit_id = NULL;
1651 	(*rt)->tag_name = NULL;
1652 	(*rt)->tag_commit = NULL;
1653 	(*rt)->commit_msg = NULL;
1654 	(*rt)->tagger = NULL;
1655 
1656 	return NULL;
1657 }