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 			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;
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 	error = got_init_repo_commit(&repo_commit);
359 	if (error)
360 		goto done;
361 
362 	/*
363 	 * XXX: jumping directly to a commit id via
364 	 * got_repo_match_object_id_prefix significantly improves performance,
365 	 * but does not allow us to create a PREVIOUS button, since commits can
366 	 * only be itereated forward. So, we have to match as we iterate from
367 	 * the headref.
368 	 */
369 	if (qs->action == BRIEFS || qs->action == COMMITS ||
370 	    (qs->action == TREE && qs->commit == NULL)) {
371 		error = got_ref_open(&ref, repo, qs->headref, 0);
372 		if (error)
373 			goto done;
374 
375 		error = got_ref_resolve(&id, repo, ref);
376 		got_ref_close(ref);
377 		if (error)
378 			goto done;
379 	} else if (qs->commit != NULL) {
380 		error = got_ref_open(&ref, repo, qs->commit, 0);
381 		if (error == NULL) {
382 			error = got_ref_resolve(&id, repo, ref);
383 			if (error)
384 				goto done;
385 			error = got_object_get_type(&obj_type, repo, id);
386 			got_ref_close(ref);
387 			if (error)
388 				goto done;
389 			if (obj_type == GOT_OBJ_TYPE_TAG) {
390 				struct got_tag_object *tag;
391 				error = got_object_open_as_tag(&tag, repo, id);
392 				if (error)
393 					goto done;
394 				if (got_object_tag_get_object_type(tag) !=
395 				    GOT_OBJ_TYPE_COMMIT) {
396 					got_object_tag_close(tag);
397 					error = got_error(GOT_ERR_OBJ_TYPE);
398 					goto done;
399 				}
400 				free(id);
401 				id = got_object_id_dup(
402 				    got_object_tag_get_object_id(tag));
403 				if (id == NULL)
404 					error = got_error_from_errno(
405 					    "got_object_id_dup");
406 				got_object_tag_close(tag);
407 				if (error)
408 					goto done;
409 			} else if (obj_type != GOT_OBJ_TYPE_COMMIT) {
410 				error = got_error(GOT_ERR_OBJ_TYPE);
411 				goto done;
412 			}
413 		}
414 		error = got_repo_match_object_id_prefix(&id, qs->commit,
415 		    GOT_OBJ_TYPE_COMMIT, repo);
416 		if (error)
417 			goto done;
418 	}
419 
420 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
421 	if (error)
422 		goto done;
423 
424 	error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name, NULL);
425 	if (error)
426 		goto done;
427 
428 	if (qs->file != NULL && strlen(qs->file) > 0) {
429 		error = got_commit_graph_open(&graph, file_path, 0);
430 		if (error)
431 			goto done;
432 	} else {
433 		error = got_commit_graph_open(&graph, in_repo_path, 0);
434 		if (error)
435 			goto done;
436 	}
437 
438 	error = got_commit_graph_iter_start(graph, id, repo, NULL, NULL);
439 	if (error)
440 		goto done;
441 
442 	for (;;) {
443 		if (limit_chk == ((limit * qs->page) - (limit - 1)) &&
444 		    commit_found == 0 && repo_commit->commit_id != NULL) {
445 			t->prev_id = strdup(repo_commit->commit_id);
446 			if (t->prev_id == NULL) {
447 				error = got_error_from_errno("strdup");
448 				goto done;
449 			}
450 		}
451 
452 		error = got_commit_graph_iter_next(&id, graph, repo, NULL,
453 		    NULL);
454 		if (error) {
455 			if (error->code == GOT_ERR_ITER_COMPLETED)
456 				error = NULL;
457 			goto done;
458 		}
459 		if (id == NULL)
460 			goto done;
461 
462 		error = got_object_open_as_commit(&commit, repo, id);
463 		if (error)
464 			goto done;
465 
466 		error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name,
467 		    NULL);
468 		if (error)
469 			goto done;
470 
471 		error = got_get_repo_commit(c, repo_commit, commit,
472 		    &refs, id);
473 		if (error)
474 			goto done;
475 
476 		if (qs->commit != NULL && commit_found == 0 && limit != 1) {
477 			if (strcmp(qs->commit, repo_commit->commit_id) == 0)
478 				commit_found = 1;
479 			else if (qs->file != NULL && strlen(qs->file) > 0 &&
480 			    qs->page == 0)
481 				commit_found = 1;
482 			else {
483 				limit_chk++;
484 				free(id);
485 				id = NULL;
486 				continue;
487 			}
488 		}
489 
490 		struct repo_commit *new_repo_commit = NULL;
491 		error = got_init_repo_commit(&new_repo_commit);
492 		if (error)
493 			goto done;
494 
495 		TAILQ_INSERT_TAIL(&t->repo_commits, new_repo_commit, entry);
496 
497 		error = got_get_repo_commit(c, new_repo_commit, commit,
498 		    &refs, id);
499 		if (error)
500 			goto done;
501 
502 		free(id);
503 		id = NULL;
504 
505 		if (limit == 1 && chk_multi == 0 &&
506 		    srv->max_commits_display != 1)
507 			commit_found = 1;
508 		else {
509 			chk_multi = 1;
510 
511 			/*
512 			 * check for one more commit before breaking,
513 			 * so we know whether to navigate through briefs
514 			 * commits and summary
515 			 */
516 			if (chk_next && (qs->action == BRIEFS ||
517 			    qs->action == COMMITS || qs->action == SUMMARY)) {
518 				t->next_id = strdup(new_repo_commit->commit_id);
519 				if (t->next_id == NULL) {
520 					error = got_error_from_errno("strdup");
521 					goto done;
522 				}
523 				if (commit) {
524 					got_object_commit_close(commit);
525 					commit = NULL;
526 				}
527 				TAILQ_REMOVE(&t->repo_commits, new_repo_commit,
528 				    entry);
529 				gotweb_free_repo_commit(new_repo_commit);
530 				goto done;
531 			}
532 		}
533 		got_ref_list_free(&refs);
534 		if (error || (limit && --limit == 0)) {
535 			if (commit_found || (qs->file != NULL &&
536 			    strlen(qs->file) > 0))
537 				if (chk_multi == 0)
538 					break;
539 			chk_next = 1;
540 		}
541 		if (commit) {
542 			got_object_commit_close(commit);
543 			commit = NULL;
544 		}
545 	}
546 done:
547 	gotweb_free_repo_commit(repo_commit);
548 	if (commit)
549 		got_object_commit_close(commit);
550 	if (graph)
551 		got_commit_graph_close(graph);
552 	got_ref_list_free(&refs);
553 	free(file_path);
554 	free(repo_path);
555 	free(id);
556 	return error;
557 }
558 
559 const struct got_error *
560 got_get_repo_tags(struct request *c, int limit)
561 {
562 	const struct got_error *error = NULL;
563 	struct got_object_id *id = NULL;
564 	struct got_commit_object *commit = NULL;
565 	struct got_reflist_head refs;
566 	struct got_reference *ref;
567 	struct got_reflist_entry *re;
568 	struct server *srv = c->srv;
569 	struct transport *t = c->t;
570 	struct got_repository *repo = t->repo;
571 	struct querystring *qs = t->qs;
572 	struct repo_dir *repo_dir = t->repo_dir;
573 	struct got_tag_object *tag = NULL;
574 	struct repo_tag *rt = NULL, *trt = NULL;
575 	char *in_repo_path = NULL, *repo_path = NULL, *id_str = NULL;
576 	char *tag_commit = NULL, *tag_commit0 = NULL;
577 	char *commit_msg = NULL, *commit_msg0 = NULL;
578 	int chk_next = 0, chk_multi = 1, commit_found = 0, c_cnt = 0;
579 
580 	TAILQ_INIT(&refs);
581 
582 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
583 	    repo_dir->name) == -1)
584 		return got_error_from_errno("asprintf");
585 
586 	if (qs->commit == NULL && qs->action == TAGS) {
587 		error = got_ref_open(&ref, repo, qs->headref, 0);
588 		if (error)
589 			goto err;
590 		error = got_ref_resolve(&id, repo, ref);
591 		got_ref_close(ref);
592 		if (error)
593 			goto err;
594 	} else if (qs->commit == NULL && qs->action == TAG) {
595 		error = got_error_msg(GOT_ERR_EOF, "commit id missing");
596 		goto err;
597 	} else {
598 		error = got_repo_match_object_id_prefix(&id, qs->commit,
599 		    GOT_OBJ_TYPE_COMMIT, repo);
600 		if (error)
601 			goto err;
602 	}
603 
604 	if (qs->action != SUMMARY && qs->action != TAGS) {
605 		error = got_object_open_as_commit(&commit, repo, id);
606 		if (error)
607 			goto err;
608 		error = got_object_commit_get_logmsg(&commit_msg0, commit);
609 		if (error)
610 			goto err;
611 		if (commit) {
612 			got_object_commit_close(commit);
613 			commit = NULL;
614 		}
615 	}
616 
617 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
618 	if (error)
619 		goto err;
620 
621 	error = got_ref_list(&refs, repo, "refs/tags", got_ref_cmp_tags,
622 	   repo);
623 	if (error)
624 		goto err;
625 
626 	if (limit == 1)
627 		chk_multi = 0;
628 
629 	/*
630 	 * XXX: again, see previous message about caching
631 	 */
632 
633 	TAILQ_FOREACH(re, &refs, entry) {
634 		struct repo_tag *new_repo_tag = NULL;
635 		error = got_init_repo_tag(&new_repo_tag);
636 		if (error)
637 			goto err;
638 
639 		TAILQ_INSERT_TAIL(&t->repo_tags, new_repo_tag, entry);
640 
641 		new_repo_tag->tag_name = strdup(got_ref_get_name(re->ref));
642 		if (new_repo_tag->tag_name == NULL) {
643 			error = got_error_from_errno("strdup");
644 			goto err;
645 		}
646 
647 		free(id);
648 		id = NULL;
649 
650 		free(id_str);
651 		id_str = NULL;
652 
653 		error = got_ref_resolve(&id, repo, re->ref);
654 		if (error)
655 			goto done;
656 
657 		if (tag)
658 			got_object_tag_close(tag);
659 		error = got_object_open_as_tag(&tag, repo, id);
660 		if (error) {
661 			if (error->code != GOT_ERR_OBJ_TYPE)
662 				goto done;
663 			/* "lightweight" tag */
664 			error = got_object_open_as_commit(&commit, repo, id);
665 			if (error)
666 				goto done;
667 			new_repo_tag->tagger =
668 			    strdup(got_object_commit_get_committer(commit));
669 			if (new_repo_tag->tagger == NULL) {
670 				error = got_error_from_errno("strdup");
671 				goto err;
672 			}
673 			new_repo_tag->tagger_time =
674 			    got_object_commit_get_committer_time(commit);
675 			error = got_object_id_str(&id_str, id);
676 			if (error)
677 				goto err;
678 		} else {
679 			new_repo_tag->tagger =
680 			    strdup(got_object_tag_get_tagger(tag));
681 			if (new_repo_tag->tagger == NULL) {
682 				error = got_error_from_errno("strdup");
683 				goto err;
684 			}
685 			new_repo_tag->tagger_time =
686 			    got_object_tag_get_tagger_time(tag);
687 			error = got_object_id_str(&id_str,
688 			    got_object_tag_get_object_id(tag));
689 			if (error)
690 				goto err;
691 		}
692 
693 		new_repo_tag->commit_id = strdup(id_str);
694 		if (new_repo_tag->commit_id == NULL)
695 			goto err;
696 
697 		if (commit_found == 0 && qs->commit != NULL &&
698 		    strncmp(id_str, qs->commit, strlen(id_str)) != 0)
699 			continue;
700 		else
701 			commit_found = 1;
702 
703 		t->tag_count++;
704 
705 		/*
706 		 * check for one more commit before breaking,
707 		 * so we know whether to navigate through briefs
708 		 * commits and summary
709 		 */
710 		if (chk_next) {
711 			t->next_id = strdup(new_repo_tag->commit_id);
712 			if (t->next_id == NULL) {
713 				error = got_error_from_errno("strdup");
714 				goto err;
715 			}
716 			if (commit) {
717 				got_object_commit_close(commit);
718 				commit = NULL;
719 			}
720 			TAILQ_REMOVE(&t->repo_tags, new_repo_tag, entry);
721 			gotweb_free_repo_tag(new_repo_tag);
722 			goto done;
723 		}
724 
725 		if (commit) {
726 			error = got_object_commit_get_logmsg(&tag_commit0,
727 			    commit);
728 			if (error)
729 				goto err;
730 			got_object_commit_close(commit);
731 			commit = NULL;
732 		} else {
733 			tag_commit0 = strdup(got_object_tag_get_message(tag));
734 			if (tag_commit0 == NULL) {
735 				error = got_error_from_errno("strdup");
736 				goto err;
737 			}
738 		}
739 
740 		tag_commit = tag_commit0;
741 		while (*tag_commit == '\n')
742 			tag_commit++;
743 		new_repo_tag->tag_commit = strdup(tag_commit);
744 		if (new_repo_tag->tag_commit == NULL) {
745 			error = got_error_from_errno("strdup");
746 			free(tag_commit0);
747 			goto err;
748 		}
749 		free(tag_commit0);
750 
751 		if (qs->action != SUMMARY && qs->action != TAGS) {
752 			commit_msg = commit_msg0;
753 			while (*commit_msg == '\n')
754 				commit_msg++;
755 
756 			new_repo_tag->commit_msg = strdup(commit_msg);
757 			if (new_repo_tag->commit_msg == NULL) {
758 				error = got_error_from_errno("strdup");
759 				goto err;
760 			}
761 		}
762 
763 		if (limit && --limit == 0) {
764 			if (chk_multi == 0)
765 				break;
766 			chk_next = 1;
767 		}
768 	}
769 
770 done:
771 	/*
772 	 * we have tailq populated, so find previous commit id
773 	 * for navigation through briefs and commits
774 	 */
775 	if (t->tag_count == 0) {
776 		TAILQ_FOREACH_SAFE(rt, &t->repo_tags, entry, trt) {
777 			TAILQ_REMOVE(&t->repo_tags, rt, entry);
778 			gotweb_free_repo_tag(rt);
779 		}
780 	}
781 	if (t->tag_count > 0 && t->prev_id == NULL && qs->commit != NULL) {
782 		commit_found = 0;
783 		TAILQ_FOREACH_REVERSE(rt, &t->repo_tags, repo_tags_head,
784 		    entry) {
785 			if (commit_found == 0 && rt->commit_id != NULL &&
786 			    strcmp(qs->commit, rt->commit_id) != 0) {
787 				continue;
788 			} else
789 				commit_found = 1;
790 			if (c_cnt == srv->max_commits_display ||
791 			    rt == TAILQ_FIRST(&t->repo_tags)) {
792 				t->prev_id = strdup(rt->commit_id);
793 				if (t->prev_id == NULL)
794 					error = got_error_from_errno("strdup");
795 				break;
796 			}
797 			c_cnt++;
798 		}
799 	}
800 err:
801 	if (commit)
802 		got_object_commit_close(commit);
803 	if (tag)
804 		got_object_tag_close(tag);
805 	got_ref_list_free(&refs);
806 	free(commit_msg0);
807 	free(in_repo_path);
808 	free(repo_path);
809 	free(id);
810 	free(id_str);
811 	return error;
812 }
813 
814 const struct got_error *
815 got_output_repo_tree(struct request *c)
816 {
817 	const struct got_error *error = NULL;
818 	struct transport *t = c->t;
819 	struct got_commit_object *commit = NULL;
820 	struct got_repository *repo = t->repo;
821 	struct querystring *qs = t->qs;
822 	struct repo_commit *rc = NULL;
823 	struct got_object_id *tree_id = NULL, *commit_id = NULL;
824 	struct got_reflist_head refs;
825 	struct got_tree_object *tree = NULL;
826 	struct repo_dir *repo_dir = t->repo_dir;
827 	const char *name, *index_page_str, *folder;
828 	char *id_str = NULL, *escaped_name = NULL;
829 	char *path = NULL, *in_repo_path = NULL, *modestr = NULL;
830 	int nentries, i, r;
831 
832 	TAILQ_INIT(&refs);
833 
834 	rc = TAILQ_FIRST(&t->repo_commits);
835 
836 	if (qs->folder != NULL) {
837 		path = strdup(qs->folder);
838 		if (path == NULL) {
839 			error = got_error_from_errno("strdup");
840 			goto done;
841 		}
842 	} else {
843 		error = got_repo_map_path(&in_repo_path, repo, repo_dir->path);
844 		if (error)
845 			goto done;
846 		free(path);
847 		path = in_repo_path;
848 	}
849 
850 	error = got_repo_match_object_id(&commit_id, NULL, rc->commit_id,
851 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
852 	if (error)
853 		goto done;
854 
855 	error = got_object_open_as_commit(&commit, repo, commit_id);
856 	if (error)
857 		goto done;
858 
859 	error = got_object_id_by_path(&tree_id, repo, commit, path);
860 	if (error)
861 		goto done;
862 
863 	error = got_object_open_as_tree(&tree, repo, tree_id);
864 	if (error)
865 		goto done;
866 
867 	nentries = got_object_tree_get_nentries(tree);
868 
869 	index_page_str = qs->index_page_str ? qs->index_page_str : "";
870 	folder = qs->folder ? qs->folder : "";
871 
872 	for (i = 0; i < nentries; i++) {
873 		struct got_tree_entry *te;
874 		mode_t mode;
875 
876 		te = got_object_tree_get_entry(tree, i);
877 
878 		error = got_object_id_str(&id_str, got_tree_entry_get_id(te));
879 		if (error)
880 			goto done;
881 
882 		modestr = strdup("");
883 		if (modestr == NULL) {
884 			error = got_error_from_errno("strdup");
885 			goto done;
886 		}
887 		mode = got_tree_entry_get_mode(te);
888 		if (got_object_tree_entry_is_submodule(te)) {
889 			free(modestr);
890 			modestr = strdup("$");
891 			if (modestr == NULL) {
892 				error = got_error_from_errno("strdup");
893 				goto done;
894 			}
895 		} else if (S_ISLNK(mode)) {
896 			free(modestr);
897 			modestr = strdup("@");
898 			if (modestr == NULL) {
899 				error = got_error_from_errno("strdup");
900 				goto done;
901 			}
902 		} else if (S_ISDIR(mode)) {
903 			free(modestr);
904 			modestr = strdup("/");
905 			if (modestr == NULL) {
906 				error = got_error_from_errno("strdup");
907 				goto done;
908 			}
909 		} else if (mode & S_IXUSR) {
910 			free(modestr);
911 			modestr = strdup("*");
912 			if (modestr == NULL) {
913 				error = got_error_from_errno("strdup");
914 				goto done;
915 			}
916 		}
917 
918 		name = got_tree_entry_get_name(te);
919 		error = gotweb_escape_html(&escaped_name, name);
920 		if (error)
921 			goto done;
922 
923 		if (S_ISDIR(mode)) {
924 			r = fcgi_printf(c,
925 			    "<div class='tree_wrapper'>\n"
926 			    "<div class='tree_line'>"
927 			    "<a class='diff_directory' "
928 			    "href='?index_page=%s&path=%s&action=tree"
929 			    "&commit=%s&folder=%s/%s'>%s%s</a>"
930 			    "</div>\n" /* .tree_line */
931 			    "<div class='tree_line_blank'>&nbsp;</div>\n"
932 			    "</div>\n", /* .tree_wrapper */
933 			    index_page_str, qs->path, rc->commit_id,
934 			    folder, name, escaped_name, modestr);
935 			if (r == -1)
936 				goto done;
937 		} else {
938 			r = fcgi_printf(c,
939 			    "<div class='tree_wrapper'>\n"
940 			    "<div class='tree_line'>"
941 			    "<a href='?index_page=%s&path=%s&action=blob"
942 			    "&commit=%s&folder=%s&file=%s'>%s%s</a>"
943 			    "</div>\n" /* .tree_line */
944 			    "<div class='tree_line_blank'>"
945 			    "<a href='?index_page=%s&path=%s&action=commits"
946 			    "&commit=%s&folder=%s&file=%s'>commits</a>\n"
947 			    " | \n"
948 			    "<a href='?index_page=%s&path=%s&action=blame"
949 			    "&commit=%s&folder=%s&file=%s'>blame</a>\n"
950 			    "</div>\n"  /* .tree_line_blank */
951 			    "</div>\n", /* .tree_wrapper */
952 			    index_page_str, qs->path, rc->commit_id,
953 			    folder, name, escaped_name, modestr,
954 			    index_page_str, qs->path, rc->commit_id,
955 			    folder, name,
956 			    index_page_str, qs->path, rc->commit_id,
957 			    folder, name);
958 			if (r == -1)
959 				goto done;
960 		}
961 		free(id_str);
962 		id_str = NULL;
963 		free(modestr);
964 		modestr = NULL;
965 		free(escaped_name);
966 		escaped_name = NULL;
967 	}
968 done:
969 	free(escaped_name);
970 	free(id_str);
971 	free(modestr);
972 	free(path);
973 	got_ref_list_free(&refs);
974 	if (commit)
975 		got_object_commit_close(commit);
976 	free(commit_id);
977 	free(tree_id);
978 	return error;
979 }
980 
981 const struct got_error *
982 got_output_file_blob(struct request *c)
983 {
984 	const struct got_error *error = NULL;
985 	struct transport *t = c->t;
986 	struct got_repository *repo = t->repo;
987 	struct querystring *qs = c->t->qs;
988 	struct got_commit_object *commit = NULL;
989 	struct got_object_id *commit_id = NULL;
990 	struct got_reflist_head refs;
991 	struct got_blob_object *blob = NULL;
992 	char *path = NULL, *in_repo_path = NULL;
993 	int obj_type, set_mime = 0, fd = -1;
994 	size_t len, hdrlen;
995 	const uint8_t *buf;
996 
997 	TAILQ_INIT(&refs);
998 
999 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1000 	    qs->folder ? "/" : "", qs->file) == -1) {
1001 		error = got_error_from_errno("asprintf");
1002 		goto done;
1003 	}
1004 
1005 	error = got_repo_map_path(&in_repo_path, repo, path);
1006 	if (error)
1007 		goto done;
1008 
1009 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1010 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1011 	if (error)
1012 		goto done;
1013 
1014 	error = got_object_open_as_commit(&commit, repo, commit_id);
1015 	if (error)
1016 		goto done;
1017 
1018 	error = got_object_id_by_path(&commit_id, repo, commit, in_repo_path);
1019 	if (error)
1020 		goto done;
1021 
1022 	if (commit_id == NULL) {
1023 		error = got_error(GOT_ERR_NO_OBJ);
1024 		goto done;
1025 	}
1026 
1027 	error = got_object_get_type(&obj_type, repo, commit_id);
1028 	if (error)
1029 		goto done;
1030 
1031 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1032 		error = got_error(GOT_ERR_OBJ_TYPE);
1033 		goto done;
1034 	}
1035 
1036 	error = got_gotweb_dupfd(&c->priv_fd[BLOB_FD_1], &fd);
1037 	if (error)
1038 		goto done;
1039 
1040 	error = got_object_open_as_blob(&blob, repo, commit_id, BUF, fd);
1041 	if (error)
1042 		goto done;
1043 	hdrlen = got_object_blob_get_hdrlen(blob);
1044 	do {
1045 		error = got_object_blob_read_block(&len, blob);
1046 		if (error)
1047 			goto done;
1048 		buf = got_object_blob_get_read_buf(blob);
1049 
1050 		/*
1051 		 * Skip blob object header first time around,
1052 		 * which also contains a zero byte.
1053 		 */
1054 		buf += hdrlen;
1055 		if (set_mime == 0) {
1056 			if (isbinary(buf, len - hdrlen)) {
1057 				error = gotweb_render_content_type_file(c,
1058 				    "application/octet-stream",
1059 				    qs->file);
1060 				if (error) {
1061 					log_warnx("%s: %s", __func__,
1062 					    error->msg);
1063 					goto done;
1064 				}
1065 			} else {
1066 				error = gotweb_render_content_type(c,
1067 				  "text/plain");
1068 				if (error) {
1069 					log_warnx("%s: %s", __func__,
1070 					    error->msg);
1071 					goto done;
1072 				}
1073 			}
1074 		}
1075 		set_mime = 1;
1076 		fcgi_gen_binary_response(c, buf, len - hdrlen);
1077 
1078 		hdrlen = 0;
1079 	} while (len != 0);
1080 done:
1081 	if (commit)
1082 		got_object_commit_close(commit);
1083 	if (fd != -1 && close(fd) == -1 && error == NULL)
1084 		error = got_error_from_errno("close");
1085 	if (blob)
1086 		got_object_blob_close(blob);
1087 	free(in_repo_path);
1088 	free(commit_id);
1089 	free(path);
1090 	return error;
1091 }
1092 
1093 struct blame_line {
1094 	int annotated;
1095 	char *id_str;
1096 	char *committer;
1097 	char datebuf[11]; /* YYYY-MM-DD + NUL */
1098 };
1099 
1100 struct blame_cb_args {
1101 	struct blame_line *lines;
1102 	int nlines;
1103 	int nlines_prec;
1104 	int lineno_cur;
1105 	off_t *line_offsets;
1106 	FILE *f;
1107 	struct got_repository *repo;
1108 	struct request *c;
1109 };
1110 
1111 static const struct got_error *
1112 got_gotweb_blame_cb(void *arg, int nlines, int lineno,
1113     struct got_commit_object *commit, struct got_object_id *id)
1114 {
1115 	const struct got_error *err = NULL;
1116 	struct blame_cb_args *a = arg;
1117 	struct blame_line *bline;
1118 	struct request *c = a->c;
1119 	struct transport *t = c->t;
1120 	struct querystring *qs = t->qs;
1121 	struct repo_dir *repo_dir = t->repo_dir;
1122 	const char *index_page_str;
1123 	char *line = NULL, *eline = NULL;
1124 	size_t linesize = 0;
1125 	off_t offset;
1126 	struct tm tm;
1127 	time_t committer_time;
1128 	int r;
1129 
1130 	if (nlines != a->nlines ||
1131 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
1132 		return got_error(GOT_ERR_RANGE);
1133 
1134 	if (lineno == -1)
1135 		return NULL; /* no change in this commit */
1136 
1137 	/* Annotate this line. */
1138 	bline = &a->lines[lineno - 1];
1139 	if (bline->annotated)
1140 		return NULL;
1141 	err = got_object_id_str(&bline->id_str, id);
1142 	if (err)
1143 		return err;
1144 
1145 	bline->committer = strdup(got_object_commit_get_committer(commit));
1146 	if (bline->committer == NULL) {
1147 		err = got_error_from_errno("strdup");
1148 		goto done;
1149 	}
1150 
1151 	committer_time = got_object_commit_get_committer_time(commit);
1152 	if (gmtime_r(&committer_time, &tm) == NULL)
1153 		return got_error_from_errno("gmtime_r");
1154 	if (strftime(bline->datebuf, sizeof(bline->datebuf), "%G-%m-%d",
1155 	    &tm) == 0) {
1156 		err = got_error(GOT_ERR_NO_SPACE);
1157 		goto done;
1158 	}
1159 	bline->annotated = 1;
1160 
1161 	/* Print lines annotated so far. */
1162 	bline = &a->lines[a->lineno_cur - 1];
1163 	if (!bline->annotated)
1164 		goto done;
1165 
1166 	offset = a->line_offsets[a->lineno_cur - 1];
1167 	if (fseeko(a->f, offset, SEEK_SET) == -1) {
1168 		err = got_error_from_errno("fseeko");
1169 		goto done;
1170 	}
1171 
1172 	index_page_str = qs->index_page_str ? qs->index_page_str : "";
1173 
1174 	while (a->lineno_cur <= a->nlines && bline->annotated) {
1175 		char *smallerthan, *at, *nl, *committer;
1176 		size_t len;
1177 
1178 		if (getline(&line, &linesize, a->f) == -1) {
1179 			if (ferror(a->f))
1180 				err = got_error_from_errno("getline");
1181 			break;
1182 		}
1183 
1184 		committer = bline->committer;
1185 		smallerthan = strchr(committer, '<');
1186 		if (smallerthan && smallerthan[1] != '\0')
1187 			committer = smallerthan + 1;
1188 		at = strchr(committer, '@');
1189 		if (at)
1190 			*at = '\0';
1191 		len = strlen(committer);
1192 		if (len >= 9)
1193 			committer[8] = '\0';
1194 
1195 		nl = strchr(line, '\n');
1196 		if (nl)
1197 			*nl = '\0';
1198 
1199 		err = gotweb_escape_html(&eline, line);
1200 		if (err)
1201 			goto done;
1202 
1203 		r = fcgi_printf(c, "<div class='blame_wrapper'>"
1204 		    "<div class='blame_number'>%.*d</div>"
1205 		    "<div class='blame_hash'>"
1206 		    "<a href='?index_page=%s&path=%s&action=diff&commit=%s'>"
1207 		    "%.8s</a>"
1208 		    "</div>"
1209 		    "<div class='blame_date'>%s</div>"
1210 		    "<div class='blame_author'>%s</div>"
1211 		    "<div class='blame_code'>%s</div>"
1212 		    "</div>",	/* .blame_wrapper */
1213 		    a->nlines_prec, a->lineno_cur,
1214 		    index_page_str, repo_dir->name, bline->id_str,
1215 		    bline->id_str,
1216 		    bline->datebuf,
1217 		    committer,
1218 		    eline);
1219 		if (r == -1)
1220 			goto done;
1221 
1222 		a->lineno_cur++;
1223 		bline = &a->lines[a->lineno_cur - 1];
1224 	}
1225 done:
1226 	free(line);
1227 	free(eline);
1228 	return err;
1229 }
1230 
1231 const struct got_error *
1232 got_output_file_blame(struct request *c)
1233 {
1234 	const struct got_error *error = NULL;
1235 	struct transport *t = c->t;
1236 	struct got_repository *repo = t->repo;
1237 	struct querystring *qs = c->t->qs;
1238 	struct got_object_id *obj_id = NULL, *commit_id = NULL;
1239 	struct got_commit_object *commit = NULL;
1240 	struct got_reflist_head refs;
1241 	struct got_blob_object *blob = NULL;
1242 	char *path = NULL, *in_repo_path = NULL;
1243 	struct blame_cb_args bca;
1244 	int i, obj_type, fd1 = -1, fd2 = -1, fd3 = -1, fd4 = -1, fd5 = -1;
1245 	int fd6 = -1;
1246 	off_t filesize;
1247 	FILE *f1 = NULL, *f2 = NULL;
1248 
1249 	TAILQ_INIT(&refs);
1250 	bca.f = NULL;
1251 	bca.lines = NULL;
1252 
1253 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1254 	    qs->folder ? "/" : "", qs->file) == -1) {
1255 		error = got_error_from_errno("asprintf");
1256 		goto done;
1257 	}
1258 
1259 	error = got_repo_map_path(&in_repo_path, repo, path);
1260 	if (error)
1261 		goto done;
1262 
1263 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1264 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1265 	if (error)
1266 		goto done;
1267 
1268 	error = got_object_open_as_commit(&commit, repo, commit_id);
1269 	if (error)
1270 		goto done;
1271 
1272 	error = got_object_id_by_path(&obj_id, repo, commit, in_repo_path);
1273 	if (error)
1274 		goto done;
1275 
1276 	if (commit_id == NULL) {
1277 		error = got_error(GOT_ERR_NO_OBJ);
1278 		goto done;
1279 	}
1280 
1281 	error = got_object_get_type(&obj_type, repo, obj_id);
1282 	if (error)
1283 		goto done;
1284 
1285 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1286 		error = got_error(GOT_ERR_OBJ_TYPE);
1287 		goto done;
1288 	}
1289 
1290 	error = got_gotweb_openfile(&bca.f, &c->priv_fd[BLAME_FD_1], &fd1);
1291 	if (error)
1292 		goto done;
1293 
1294 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_2], &fd2);
1295 	if (error)
1296 		goto done;
1297 
1298 	error = got_object_open_as_blob(&blob, repo, obj_id, BUF, fd2);
1299 	if (error)
1300 		goto done;
1301 
1302 	error = got_object_blob_dump_to_file(&filesize, &bca.nlines,
1303 	    &bca.line_offsets, bca.f, blob);
1304 	if (error || bca.nlines == 0)
1305 		goto done;
1306 
1307 	/* Don't include \n at EOF in the blame line count. */
1308 	if (bca.line_offsets[bca.nlines - 1] == filesize)
1309 		bca.nlines--;
1310 
1311 	bca.lines = calloc(bca.nlines, sizeof(*bca.lines));
1312 	if (bca.lines == NULL) {
1313 		error = got_error_from_errno("calloc");
1314 		goto done;
1315 	}
1316 	bca.lineno_cur = 1;
1317 	bca.nlines_prec = 0;
1318 	i = bca.nlines;
1319 	while (i > 0) {
1320 		i /= 10;
1321 		bca.nlines_prec++;
1322 	}
1323 	bca.repo = repo;
1324 	bca.c = c;
1325 
1326 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_3], &fd3);
1327 	if (error)
1328 		goto done;
1329 
1330 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_4], &fd4);
1331 	if (error)
1332 		goto done;
1333 
1334 	error = got_gotweb_openfile(&f1, &c->priv_fd[BLAME_FD_5], &fd5);
1335 	if (error)
1336 		goto done;
1337 
1338 	error = got_gotweb_openfile(&f2, &c->priv_fd[BLAME_FD_6], &fd6);
1339 	if (error)
1340 		goto done;
1341 
1342 	error = got_blame(in_repo_path, commit_id, repo,
1343 	    GOT_DIFF_ALGORITHM_MYERS, got_gotweb_blame_cb, &bca, NULL, NULL,
1344 	    fd3, fd4, f1, f2);
1345 
1346 	if (blob) {
1347 		free(bca.line_offsets);
1348 		for (i = 0; i < bca.nlines; i++) {
1349 			struct blame_line *bline = &bca.lines[i];
1350 			free(bline->id_str);
1351 			free(bline->committer);
1352 		}
1353 	}
1354 done:
1355 	free(bca.lines);
1356 	if (fd2 != -1 && close(fd2) == -1 && error == NULL)
1357 		error = got_error_from_errno("close");
1358 	if (fd3 != -1 && close(fd3) == -1 && error == NULL)
1359 		error = got_error_from_errno("close");
1360 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1361 		error = got_error_from_errno("close");
1362 	if (bca.f) {
1363 		const struct got_error *bca_err =
1364 		    got_gotweb_flushfile(bca.f, fd1);
1365 		if (error == NULL)
1366 			error = bca_err;
1367 	}
1368 	if (f1) {
1369 		const struct got_error *f1_err =
1370 		    got_gotweb_flushfile(f1, fd5);
1371 		if (error == NULL)
1372 			error = f1_err;
1373 	}
1374 	if (f2) {
1375 		const struct got_error *f2_err =
1376 		    got_gotweb_flushfile(f2, fd6);
1377 		if (error == NULL)
1378 			error = f2_err;
1379 	}
1380 	if (commit)
1381 		got_object_commit_close(commit);
1382 	if (blob)
1383 		got_object_blob_close(blob);
1384 	free(in_repo_path);
1385 	free(commit_id);
1386 	free(path);
1387 	return error;
1388 }
1389 
1390 const struct got_error *
1391 got_output_repo_diff(struct request *c)
1392 {
1393 	const struct got_error *error = NULL;
1394 	struct transport *t = c->t;
1395 	struct got_repository *repo = t->repo;
1396 	struct repo_commit *rc = NULL;
1397 	struct got_object_id *id1 = NULL, *id2 = NULL;
1398 	struct got_reflist_head refs;
1399 	FILE *f1 = NULL, *f2 = NULL, *f3 = NULL;
1400 	char *label1 = NULL, *label2 = NULL, *line = NULL;
1401 	char *newline, *eline = NULL, *color = NULL;
1402 	int obj_type, fd1, fd2, fd3, fd4 = -1, fd5 = -1;
1403 	size_t linesize = 0;
1404 	ssize_t linelen;
1405 	int wrlen = 0;
1406 
1407 	TAILQ_INIT(&refs);
1408 
1409 	error = got_gotweb_openfile(&f1, &c->priv_fd[DIFF_FD_1], &fd1);
1410 	if (error)
1411 		return error;
1412 
1413 	error = got_gotweb_openfile(&f2, &c->priv_fd[DIFF_FD_2], &fd2);
1414 	if (error)
1415 		return error;
1416 
1417 	error = got_gotweb_openfile(&f3, &c->priv_fd[DIFF_FD_3], &fd3);
1418 	if (error)
1419 		return error;
1420 
1421 	rc = TAILQ_FIRST(&t->repo_commits);
1422 
1423 	if (rc->parent_id != NULL &&
1424 	    strncmp(rc->parent_id, "/dev/null", 9) != 0) {
1425 		error = got_repo_match_object_id(&id1, &label1,
1426 		    rc->parent_id, GOT_OBJ_TYPE_ANY,
1427 		    &refs, repo);
1428 		if (error)
1429 			goto done;
1430 	}
1431 
1432 	error = got_repo_match_object_id(&id2, &label2, rc->commit_id,
1433 	    GOT_OBJ_TYPE_ANY, &refs, repo);
1434 	if (error)
1435 		goto done;
1436 
1437 	error = got_object_get_type(&obj_type, repo, id2);
1438 	if (error)
1439 		goto done;
1440 
1441 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_4], &fd4);
1442 	if (error)
1443 		goto done;
1444 
1445 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_5], &fd5);
1446 	if (error)
1447 		goto done;
1448 
1449 	switch (obj_type) {
1450 	case GOT_OBJ_TYPE_BLOB:
1451 		error = got_diff_objects_as_blobs(NULL, NULL, f1, f2, fd4, fd5,
1452 		     id1, id2, NULL, NULL, GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1453 		     repo, f3);
1454 		break;
1455 	case GOT_OBJ_TYPE_TREE:
1456 		error = got_diff_objects_as_trees(NULL, NULL, f1, f2, fd4, fd5,
1457 		    id1, id2, NULL, "", "",  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1458 		    repo, f3);
1459 		break;
1460 	case GOT_OBJ_TYPE_COMMIT:
1461 		error = got_diff_objects_as_commits(NULL, NULL, f1, f2, fd4,
1462 		    fd5, id1, id2, NULL,  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1463 		    repo, f3);
1464 		break;
1465 	default:
1466 		error = got_error(GOT_ERR_OBJ_TYPE);
1467 	}
1468 	if (error)
1469 		goto done;
1470 
1471 	if (fseek(f1, 0, SEEK_SET) == -1) {
1472 		error = got_ferror(f1, GOT_ERR_IO);
1473 		goto done;
1474 	}
1475 
1476 	if (fseek(f2, 0, SEEK_SET) == -1) {
1477 		error = got_ferror(f2, GOT_ERR_IO);
1478 		goto done;
1479 	}
1480 
1481 	if (fseek(f3, 0, SEEK_SET) == -1) {
1482 		error = got_ferror(f3, GOT_ERR_IO);
1483 		goto done;
1484 	}
1485 
1486 	while ((linelen = getline(&line, &linesize, f3)) != -1) {
1487 		if (strncmp(line, "-", 1) == 0) {
1488 			color = strdup("diff_minus");
1489 			if (color == NULL) {
1490 				error = got_error_from_errno("strdup");
1491 				goto done;
1492 			}
1493 		} else if (strncmp(line, "+", 1) == 0) {
1494 			color = strdup("diff_plus");
1495 			if (color == NULL) {
1496 				error = got_error_from_errno("strdup");
1497 				goto done;
1498 			}
1499 		} else if (strncmp(line, "@@", 2) == 0) {
1500 			color = strdup("diff_chunk_header");
1501 			if (color == NULL) {
1502 				error = got_error_from_errno("strdup");
1503 				goto done;
1504 			}
1505 		} else if (strncmp(line, "@@", 2) == 0) {
1506 			color = strdup("diff_chunk_header");
1507 			if (color == NULL) {
1508 				error = got_error_from_errno("strdup");
1509 				goto done;
1510 			}
1511 		} else if (strncmp(line, "commit +", 8) == 0) {
1512 			color = strdup("diff_meta");
1513 			if (color == NULL) {
1514 				error = got_error_from_errno("strdup");
1515 				goto done;
1516 			}
1517 		} else if (strncmp(line, "commit -", 8) == 0) {
1518 			color = strdup("diff_meta");
1519 			if (color == NULL) {
1520 				error = got_error_from_errno("strdup");
1521 				goto done;
1522 			}
1523 		} else if (strncmp(line, "blob +", 6) == 0) {
1524 			color = strdup("diff_meta");
1525 			if (color == NULL) {
1526 				error = got_error_from_errno("strdup");
1527 				goto done;
1528 			}
1529 		} else if (strncmp(line, "blob -", 6) == 0) {
1530 			color = strdup("diff_meta");
1531 			if (color == NULL) {
1532 				error = got_error_from_errno("strdup");
1533 				goto done;
1534 			}
1535 		} else if (strncmp(line, "file +", 6) == 0) {
1536 			color = strdup("diff_meta");
1537 			if (color == NULL) {
1538 				error = got_error_from_errno("strdup");
1539 				goto done;
1540 			}
1541 		} else if (strncmp(line, "file -", 6) == 0) {
1542 			color = strdup("diff_meta");
1543 			if (color == NULL) {
1544 				error = got_error_from_errno("strdup");
1545 				goto done;
1546 			}
1547 		} else if (strncmp(line, "from:", 5) == 0) {
1548 			color = strdup("diff_author");
1549 			if (color == NULL) {
1550 				error = got_error_from_errno("strdup");
1551 				goto done;
1552 			}
1553 		} else if (strncmp(line, "via:", 4) == 0) {
1554 			color = strdup("diff_author");
1555 			if (color == NULL) {
1556 				error = got_error_from_errno("strdup");
1557 				goto done;
1558 			}
1559 		} else if (strncmp(line, "date:", 5) == 0) {
1560 			color = strdup("diff_date");
1561 			if (color == NULL) {
1562 				error = got_error_from_errno("strdup");
1563 				goto done;
1564 			}
1565 		}
1566 
1567 		newline = strchr(line, '\n');
1568 		if (newline)
1569 			*newline = '\0';
1570 
1571 		error = gotweb_escape_html(&eline, line);
1572 		if (error)
1573 			goto done;
1574 
1575 		fcgi_printf(c, "<div class='diff_line %s'>%s</div>\n",
1576 		    color ? color : "", eline);
1577 		free(eline);
1578 		eline = NULL;
1579 
1580 		if (linelen > 0)
1581 			wrlen = wrlen + linelen;
1582 		free(color);
1583 		color = NULL;
1584 	}
1585 	if (linelen == -1 && ferror(f3))
1586 		error = got_error_from_errno("getline");
1587 done:
1588 	free(color);
1589 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1590 		error = got_error_from_errno("close");
1591 	if (fd5 != -1 && close(fd5) == -1 && error == NULL)
1592 		error = got_error_from_errno("close");
1593 	if (f1) {
1594 		const struct got_error *f1_err =
1595 		    got_gotweb_flushfile(f1, fd1);
1596 		if (error == NULL)
1597 			error = f1_err;
1598 	}
1599 	if (f2) {
1600 		const struct got_error *f2_err =
1601 		    got_gotweb_flushfile(f2, fd2);
1602 		if (error == NULL)
1603 			error = f2_err;
1604 	}
1605 	if (f3) {
1606 		const struct got_error *f3_err =
1607 		    got_gotweb_flushfile(f3, fd3);
1608 		if (error == NULL)
1609 			error = f3_err;
1610 	}
1611 	got_ref_list_free(&refs);
1612 	free(line);
1613 	free(eline);
1614 	free(label1);
1615 	free(label2);
1616 	free(id1);
1617 	free(id2);
1618 	return error;
1619 }
1620 
1621 static const struct got_error *
1622 got_init_repo_commit(struct repo_commit **rc)
1623 {
1624 	*rc = calloc(1, sizeof(**rc));
1625 	if (*rc == NULL)
1626 		return got_error_from_errno2("%s: calloc", __func__);
1627 
1628 	(*rc)->path = NULL;
1629 	(*rc)->refs_str = NULL;
1630 	(*rc)->commit_id = NULL;
1631 	(*rc)->committer = NULL;
1632 	(*rc)->author = NULL;
1633 	(*rc)->parent_id = NULL;
1634 	(*rc)->tree_id = NULL;
1635 	(*rc)->commit_msg = NULL;
1636 
1637 	return NULL;
1638 }
1639 
1640 static const struct got_error *
1641 got_init_repo_tag(struct repo_tag **rt)
1642 {
1643 	*rt = calloc(1, sizeof(**rt));
1644 	if (*rt == NULL)
1645 		return got_error_from_errno2("%s: calloc", __func__);
1646 
1647 	(*rt)->commit_id = NULL;
1648 	(*rt)->tag_name = NULL;
1649 	(*rt)->tag_commit = NULL;
1650 	(*rt)->commit_msg = NULL;
1651 	(*rt)->tagger = NULL;
1652 
1653 	return NULL;
1654 }