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Date:: Sat Aug 20 13:58:05 2022 UTC
Message:: gotwebd: make sure to escape possibly unsafe strings this fixes only the HTML escaping of strings, the urlencode is still missig. while here also plug a memory leak in gotweb_render_branches and drop some needless ternary operators. ok tracey@
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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 	const struct got_error *error = NULL;
87 
88 	*fd = dup(*priv_fd);
89 
90 	if (*fd < 0)
91 		return NULL;
92 
93 	*f = fdopen(*fd, "w+");
94 	if (*f == NULL) {
95 		close(*fd);
96 		error = got_error(GOT_ERR_PRIVSEP_NO_FD);
97 	}
98 
99 	return error;
100 }
101 
102 static const struct got_error *
103 got_gotweb_dupfd(int *priv_fd, int *fd)
104 {
105 	const struct got_error *error = NULL;
106 
107 	*fd = dup(*priv_fd);
108 
109 	if (*fd < 0)
110 		return NULL;
111 
112 	return error;
113 }
114 
115 const struct got_error *
116 got_get_repo_owner(char **owner, struct request *c, char *dir)
117 {
118 	const struct got_error *error = NULL;
119 	struct server *srv = c->srv;
120 	struct transport *t = c->t;
121 	struct got_repository *repo = t->repo;
122 	const char *gitconfig_owner;
123 
124 	*owner = NULL;
125 
126 	if (srv->show_repo_owner == 0)
127 		return NULL;
128 
129 	gitconfig_owner = got_repo_get_gitconfig_owner(repo);
130 	if (gitconfig_owner) {
131 		*owner = strdup(gitconfig_owner);
132 		if (*owner == NULL)
133 			return got_error_from_errno("strdup");
134 	}
135 	return error;
136 }
137 
138 const struct got_error *
139 got_get_repo_age(char **repo_age, struct request *c, char *dir,
140     const char *refname, int ref_tm)
141 {
142 	const struct got_error *error = NULL;
143 	struct server *srv = c->srv;
144 	struct transport *t = c->t;
145 	struct got_repository *repo = t->repo;
146 	struct got_commit_object *commit = NULL;
147 	struct got_reflist_head refs;
148 	struct got_reflist_entry *re;
149 	time_t committer_time = 0, cmp_time = 0;
150 
151 	*repo_age = NULL;
152 	TAILQ_INIT(&refs);
153 
154 	if (srv->show_repo_age == 0)
155 		return NULL;
156 
157 	error = got_ref_list(&refs, repo, "refs/heads",
158 	    got_ref_cmp_by_name, NULL);
159 	if (error)
160 		goto done;
161 
162 	/*
163 	 * Find the youngest branch tip in the repository, or the age of
164 	 * the a specific branch tip if a name was provided by the caller.
165 	 */
166 	TAILQ_FOREACH(re, &refs, entry) {
167 		struct got_object_id *id = NULL;
168 
169 		if (refname && strcmp(got_ref_get_name(re->ref), refname) != 0)
170 			continue;
171 
172 		error = got_ref_resolve(&id, repo, re->ref);
173 		if (error)
174 			goto done;
175 
176 		error = got_object_open_as_commit(&commit, repo, id);
177 		free(id);
178 		if (error)
179 			goto done;
180 
181 		committer_time =
182 		    got_object_commit_get_committer_time(commit);
183 		got_object_commit_close(commit);
184 		if (cmp_time < committer_time)
185 			cmp_time = committer_time;
186 
187 		if (refname)
188 			break;
189 	}
190 
191 	if (cmp_time != 0) {
192 		committer_time = cmp_time;
193 		error = gotweb_get_time_str(repo_age, committer_time, ref_tm);
194 	}
195 done:
196 	got_ref_list_free(&refs);
197 	return error;
198 }
199 
200 static const struct got_error *
201 got_get_repo_commit(struct request *c, struct repo_commit *repo_commit,
202     struct got_commit_object *commit, struct got_reflist_head *refs,
203     struct got_object_id *id)
204 {
205 	const struct got_error *error = NULL;
206 	struct got_reflist_entry *re;
207 	struct got_object_id *id2 = NULL;
208 	struct got_object_qid *parent_id;
209 	struct transport *t = c->t;
210 	struct querystring *qs = c->t->qs;
211 	char *commit_msg = NULL, *commit_msg0;
212 
213 	TAILQ_FOREACH(re, refs, entry) {
214 		char *s;
215 		const char *name;
216 		struct got_tag_object *tag = NULL;
217 		struct got_object_id *ref_id;
218 		int cmp;
219 
220 		if (got_ref_is_symbolic(re->ref))
221 			continue;
222 
223 		name = got_ref_get_name(re->ref);
224 		if (strncmp(name, "refs/", 5) == 0)
225 			name += 5;
226 		if (strncmp(name, "got/", 4) == 0)
227 			continue;
228 		if (strncmp(name, "heads/", 6) == 0)
229 			name += 6;
230 		if (strncmp(name, "remotes/", 8) == 0) {
231 			name += 8;
232 			s = strstr(name, "/" GOT_REF_HEAD);
233 			if (s != NULL && s[strlen(s)] == '\0')
234 				continue;
235 		}
236 		error = got_ref_resolve(&ref_id, t->repo, re->ref);
237 		if (error)
238 			return error;
239 		if (strncmp(name, "tags/", 5) == 0) {
240 			error = got_object_open_as_tag(&tag, t->repo, ref_id);
241 			if (error) {
242 				if (error->code != GOT_ERR_OBJ_TYPE) {
243 					free(ref_id);
244 					continue;
245 				}
246 				/*
247 				 * Ref points at something other
248 				 * than a tag.
249 				 */
250 				error = NULL;
251 				tag = NULL;
252 			}
253 		}
254 		cmp = got_object_id_cmp(tag ?
255 		    got_object_tag_get_object_id(tag) : ref_id, id);
256 		free(ref_id);
257 		if (tag)
258 			got_object_tag_close(tag);
259 		if (cmp != 0)
260 			continue;
261 		s = repo_commit->refs_str;
262 		if (asprintf(&repo_commit->refs_str, "%s%s%s", s ? s : "",
263 		    s ? ", " : "", name) == -1) {
264 			error = got_error_from_errno("asprintf");
265 			free(s);
266 			repo_commit->refs_str = NULL;
267 			return error;
268 		}
269 		free(s);
270 	}
271 
272 	error = got_object_id_str(&repo_commit->commit_id, id);
273 	if (error)
274 		return error;
275 
276 	error = got_object_id_str(&repo_commit->tree_id,
277 	    got_object_commit_get_tree_id(commit));
278 	if (error)
279 		return error;
280 
281 	if (qs->action == DIFF) {
282 		parent_id = STAILQ_FIRST(
283 		    got_object_commit_get_parent_ids(commit));
284 		if (parent_id != NULL) {
285 			id2 = got_object_id_dup(&parent_id->id);
286 			error = got_object_id_str(&repo_commit->parent_id, id2);
287 			if (error)
288 				return error;
289 			free(id2);
290 		} else {
291 			repo_commit->parent_id = strdup("/dev/null");
292 			if (repo_commit->parent_id == NULL) {
293 				error = got_error_from_errno("strdup");
294 				return error;
295 			}
296 		}
297 	}
298 
299 	repo_commit->committer_time =
300 	    got_object_commit_get_committer_time(commit);
301 
302 	repo_commit->author =
303 	    strdup(got_object_commit_get_author(commit));
304 	if (repo_commit->author == NULL) {
305 		error = got_error_from_errno("strdup");
306 		return error;
307 	}
308 	repo_commit->committer =
309 	    strdup(got_object_commit_get_committer(commit));
310 	if (repo_commit->committer == NULL) {
311 		error = got_error_from_errno("strdup");
312 		return error;
313 	}
314 	error = got_object_commit_get_logmsg(&commit_msg0, commit);
315 	if (error)
316 		return error;
317 
318 	commit_msg = commit_msg0;
319 	while (*commit_msg == '\n')
320 		commit_msg++;
321 
322 	repo_commit->commit_msg = strdup(commit_msg);
323 	if (repo_commit->commit_msg == NULL)
324 		error = got_error_from_errno("strdup");
325 	free(commit_msg0);
326 	return error;
327 }
328 
329 const struct got_error *
330 got_get_repo_commits(struct request *c, int limit)
331 {
332 	const struct got_error *error = NULL;
333 	struct got_object_id *id = NULL;
334 	struct got_commit_graph *graph = NULL;
335 	struct got_commit_object *commit = NULL;
336 	struct got_reflist_head refs;
337 	struct got_reference *ref;
338 	struct repo_commit *repo_commit = NULL;
339 	struct server *srv = c->srv;
340 	struct transport *t = c->t;
341 	struct got_repository *repo = t->repo;
342 	struct querystring *qs = t->qs;
343 	struct repo_dir *repo_dir = t->repo_dir;
344 	char *in_repo_path = NULL, *repo_path = NULL, *file_path = NULL;
345 	int chk_next = 0, chk_multi = 0, commit_found = 0;
346 	int obj_type, limit_chk = 0;
347 
348 	TAILQ_INIT(&refs);
349 
350 	if (qs->file != NULL && strlen(qs->file) > 0)
351 		if (asprintf(&file_path, "%s/%s", qs->folder ? qs->folder : "",
352 		    qs->file) == -1)
353 			return got_error_from_errno("asprintf");
354 
355 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
356 	    repo_dir->name) == -1)
357 		return got_error_from_errno("asprintf");
358 
359 	error = got_init_repo_commit(&repo_commit);
360 	if (error)
361 		return error;
362 
363 	/*
364 	 * XXX: jumping directly to a commit id via
365 	 * got_repo_match_object_id_prefix significantly improves performance,
366 	 * but does not allow us to create a PREVIOUS button, since commits can
367 	 * only be itereated forward. So, we have to match as we iterate from
368 	 * the headref.
369 	 */
370 	if (qs->action == BRIEFS || qs->action == COMMITS ||
371 	    (qs->action == TREE && qs->commit == NULL)) {
372 		error = got_ref_open(&ref, repo, qs->headref, 0);
373 		if (error)
374 			goto done;
375 
376 		error = got_ref_resolve(&id, repo, ref);
377 		got_ref_close(ref);
378 		if (error)
379 			goto done;
380 	} else if (qs->commit != NULL) {
381 		error = got_ref_open(&ref, repo, qs->commit, 0);
382 		if (error == NULL) {
383 			error = got_ref_resolve(&id, repo, ref);
384 			if (error)
385 				goto done;
386 			error = got_object_get_type(&obj_type, repo, id);
387 			got_ref_close(ref);
388 			if (error)
389 				goto done;
390 			if (obj_type == GOT_OBJ_TYPE_TAG) {
391 				struct got_tag_object *tag;
392 				error = got_object_open_as_tag(&tag, repo, id);
393 				if (error)
394 					goto done;
395 				if (got_object_tag_get_object_type(tag) !=
396 				    GOT_OBJ_TYPE_COMMIT) {
397 					got_object_tag_close(tag);
398 					error = got_error(GOT_ERR_OBJ_TYPE);
399 					goto done;
400 				}
401 				free(id);
402 				id = got_object_id_dup(
403 				    got_object_tag_get_object_id(tag));
404 				if (id == NULL)
405 					error = got_error_from_errno(
406 					    "got_object_id_dup");
407 				got_object_tag_close(tag);
408 				if (error)
409 					goto done;
410 			} else if (obj_type != GOT_OBJ_TYPE_COMMIT) {
411 				error = got_error(GOT_ERR_OBJ_TYPE);
412 				goto done;
413 			}
414 		}
415 		error = got_repo_match_object_id_prefix(&id, qs->commit,
416 		    GOT_OBJ_TYPE_COMMIT, repo);
417 		if (error)
418 			goto done;
419 	}
420 
421 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
422 	if (error)
423 		goto done;
424 
425 	error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name, NULL);
426 	if (error)
427 		goto done;
428 
429 	if (qs->file != NULL && strlen(qs->file) > 0) {
430 		error = got_commit_graph_open(&graph, file_path, 0);
431 		if (error)
432 			goto done;
433 	} else {
434 		error = got_commit_graph_open(&graph, in_repo_path, 0);
435 		if (error)
436 			goto done;
437 	}
438 
439 	error = got_commit_graph_iter_start(graph, id, repo, NULL, NULL);
440 	if (error)
441 		goto done;
442 
443 	for (;;) {
444 		if (limit_chk == ((limit * qs->page) - (limit - 1)) &&
445 		    commit_found == 0 && repo_commit->commit_id != NULL) {
446 			t->prev_id = strdup(repo_commit->commit_id);
447 			if (t->prev_id == NULL) {
448 				error = got_error_from_errno("strdup");
449 				goto done;
450 			}
451 		}
452 
453 		error = got_commit_graph_iter_next(&id, graph, repo, NULL,
454 		    NULL);
455 		if (error) {
456 			if (error->code == GOT_ERR_ITER_COMPLETED)
457 				error = NULL;
458 			goto done;
459 		}
460 		if (id == NULL)
461 			goto done;
462 
463 		error = got_object_open_as_commit(&commit, repo, id);
464 		if (error)
465 			goto done;
466 
467 		error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name,
468 		    NULL);
469 		if (error)
470 			goto done;
471 
472 		error = got_get_repo_commit(c, repo_commit, commit,
473 		    &refs, id);
474 		if (error)
475 			goto done;
476 
477 		if (qs->commit != NULL && commit_found == 0 && limit != 1) {
478 			if (strcmp(qs->commit, repo_commit->commit_id) == 0)
479 				commit_found = 1;
480 			else if (qs->file != NULL && strlen(qs->file) > 0 &&
481 			    qs->page == 0)
482 				commit_found = 1;
483 			else {
484 				limit_chk++;
485 				free(id);
486 				id = NULL;
487 				continue;
488 			}
489 		}
490 
491 		struct repo_commit *new_repo_commit = NULL;
492 		error = got_init_repo_commit(&new_repo_commit);
493 		if (error)
494 			goto done;
495 
496 		TAILQ_INSERT_TAIL(&t->repo_commits, new_repo_commit, entry);
497 
498 		error = got_get_repo_commit(c, new_repo_commit, commit,
499 		    &refs, id);
500 		if (error)
501 			goto done;
502 
503 		free(id);
504 		id = NULL;
505 
506 		if (limit == 1 && chk_multi == 0 &&
507 		    srv->max_commits_display != 1)
508 			commit_found = 1;
509 		else {
510 			chk_multi = 1;
511 
512 			/*
513 			 * check for one more commit before breaking,
514 			 * so we know whether to navigate through briefs
515 			 * commits and summary
516 			 */
517 			if (chk_next && (qs->action == BRIEFS ||
518 			    qs->action == COMMITS || qs->action == SUMMARY)) {
519 				t->next_id = strdup(new_repo_commit->commit_id);
520 				if (t->next_id == NULL) {
521 					error = got_error_from_errno("strdup");
522 					goto done;
523 				}
524 				if (commit) {
525 					got_object_commit_close(commit);
526 					commit = NULL;
527 				}
528 				if (t->next_id == NULL) {
529 					error = got_error_from_errno("strdup");
530 					goto done;
531 				}
532 				TAILQ_REMOVE(&t->repo_commits, new_repo_commit,
533 				    entry);
534 				gotweb_free_repo_commit(new_repo_commit);
535 				goto done;
536 			}
537 		}
538 		got_ref_list_free(&refs);
539 		if (error || (limit && --limit == 0)) {
540 			if (commit_found || (qs->file != NULL &&
541 			    strlen(qs->file) > 0))
542 				if (chk_multi == 0)
543 					break;
544 			chk_next = 1;
545 		}
546 		if (commit) {
547 			got_object_commit_close(commit);
548 			commit = NULL;
549 		}
550 	}
551 done:
552 	gotweb_free_repo_commit(repo_commit);
553 	if (commit)
554 		got_object_commit_close(commit);
555 	if (graph)
556 		got_commit_graph_close(graph);
557 	got_ref_list_free(&refs);
558 	free(file_path);
559 	free(repo_path);
560 	free(id);
561 	return error;
562 }
563 
564 const struct got_error *
565 got_get_repo_tags(struct request *c, int limit)
566 {
567 	const struct got_error *error = NULL;
568 	struct got_object_id *id = NULL;
569 	struct got_commit_object *commit = NULL;
570 	struct got_reflist_head refs;
571 	struct got_reference *ref;
572 	struct got_reflist_entry *re;
573 	struct server *srv = c->srv;
574 	struct transport *t = c->t;
575 	struct got_repository *repo = t->repo;
576 	struct querystring *qs = t->qs;
577 	struct repo_dir *repo_dir = t->repo_dir;
578 	struct got_tag_object *tag = NULL;
579 	struct repo_tag *rt = NULL, *trt = NULL;
580 	char *in_repo_path = NULL, *repo_path = NULL, *id_str = NULL;
581 	char *commit_msg = NULL, *commit_msg0 = NULL;
582 	int chk_next = 0, chk_multi = 1, commit_found = 0, c_cnt = 0;
583 
584 	TAILQ_INIT(&refs);
585 
586 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
587 	    repo_dir->name) == -1)
588 		return got_error_from_errno("asprintf");
589 
590 	if (error)
591 		return error;
592 
593 	if (qs->commit == NULL && qs->action == TAGS) {
594 		error = got_ref_open(&ref, repo, qs->headref, 0);
595 		if (error)
596 			goto err;
597 		error = got_ref_resolve(&id, repo, ref);
598 		got_ref_close(ref);
599 		if (error)
600 			goto err;
601 	} else if (qs->commit == NULL && qs->action == TAG) {
602 		error = got_error_msg(GOT_ERR_EOF, "commit id missing");
603 		goto err;
604 	} else {
605 		error = got_repo_match_object_id_prefix(&id, qs->commit,
606 		    GOT_OBJ_TYPE_COMMIT, repo);
607 		if (error)
608 			goto err;
609 	}
610 
611 	if (qs->action != SUMMARY && qs->action != TAGS) {
612 		error = got_object_open_as_commit(&commit, repo, id);
613 		if (error)
614 			goto err;
615 		error = got_object_commit_get_logmsg(&commit_msg0, commit);
616 		if (error)
617 			goto err;
618 		if (commit) {
619 			got_object_commit_close(commit);
620 			commit = NULL;
621 		}
622 	}
623 
624 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
625 	if (error)
626 		goto err;
627 
628 	error = got_ref_list(&refs, repo, "refs/tags", got_ref_cmp_tags,
629 	   repo);
630 	if (error)
631 		goto err;
632 
633 	if (limit == 1)
634 		chk_multi = 0;
635 
636 	/*
637 	 * XXX: again, see previous message about caching
638 	 */
639 
640 	TAILQ_FOREACH(re, &refs, entry) {
641 		struct repo_tag *new_repo_tag = NULL;
642 		error = got_init_repo_tag(&new_repo_tag);
643 		if (error)
644 			goto err;
645 
646 		TAILQ_INSERT_TAIL(&t->repo_tags, new_repo_tag, entry);
647 
648 		new_repo_tag->tag_name = strdup(got_ref_get_name(re->ref));
649 		if (new_repo_tag->tag_name == NULL) {
650 			error = got_error_from_errno("strdup");
651 			goto err;
652 		}
653 
654 		error = got_ref_resolve(&id, repo, re->ref);
655 		if (error)
656 			goto done;
657 
658 		error = got_object_open_as_tag(&tag, repo, id);
659 		if (error) {
660 			if (error->code != GOT_ERR_OBJ_TYPE) {
661 				free(id);
662 				id = NULL;
663 				goto done;
664 			}
665 			/* "lightweight" tag */
666 			error = got_object_open_as_commit(&commit, repo, id);
667 			if (error) {
668 				free(id);
669 				id = NULL;
670 				goto done;
671 			}
672 			new_repo_tag->tagger =
673 			    strdup(got_object_commit_get_committer(commit));
674 			if (new_repo_tag->tagger == NULL) {
675 				error = got_error_from_errno("strdup");
676 				goto err;
677 			}
678 			new_repo_tag->tagger_time =
679 			    got_object_commit_get_committer_time(commit);
680 			error = got_object_id_str(&id_str, id);
681 			if (error)
682 				goto err;
683 			free(id);
684 			id = NULL;
685 		} else {
686 			free(id);
687 			id = NULL;
688 			new_repo_tag->tagger =
689 			    strdup(got_object_tag_get_tagger(tag));
690 			if (new_repo_tag->tagger == NULL) {
691 				error = got_error_from_errno("strdup");
692 				goto err;
693 			}
694 			new_repo_tag->tagger_time =
695 			    got_object_tag_get_tagger_time(tag);
696 			error = got_object_id_str(&id_str,
697 			    got_object_tag_get_object_id(tag));
698 			if (error)
699 				goto err;
700 		}
701 
702 		new_repo_tag->commit_id = strdup(id_str);
703 		if (new_repo_tag->commit_id == NULL)
704 			goto err;
705 
706 		if (commit_found == 0 && qs->commit != NULL &&
707 		    strncmp(id_str, qs->commit, strlen(id_str)) != 0)
708 			continue;
709 		else
710 			commit_found = 1;
711 
712 		t->tag_count++;
713 
714 		/*
715 		 * check for one more commit before breaking,
716 		 * so we know whether to navigate through briefs
717 		 * commits and summary
718 		 */
719 		if (chk_next) {
720 			t->next_id = strdup(new_repo_tag->commit_id);
721 			if (t->next_id == NULL) {
722 				error = got_error_from_errno("strdup");
723 				goto err;
724 			}
725 			if (commit) {
726 				got_object_commit_close(commit);
727 				commit = NULL;
728 			}
729 			if (t->next_id == NULL) {
730 				error = got_error_from_errno("strdup");
731 				goto err;
732 			}
733 			TAILQ_REMOVE(&t->repo_tags, new_repo_tag, entry);
734 			gotweb_free_repo_tag(new_repo_tag);
735 			goto done;
736 		}
737 
738 		if (commit) {
739 			error = got_object_commit_get_logmsg(&new_repo_tag->
740 			    tag_commit, commit);
741 			if (error)
742 				goto done;
743 			got_object_commit_close(commit);
744 			commit = NULL;
745 		} else {
746 			new_repo_tag->tag_commit =
747 			    strdup(got_object_tag_get_message(tag));
748 			if (new_repo_tag->tag_commit == NULL) {
749 				error = got_error_from_errno("strdup");
750 				goto done;
751 			}
752 		}
753 
754 		while (*new_repo_tag->tag_commit == '\n')
755 			new_repo_tag->tag_commit++;
756 
757 		if (qs->action != SUMMARY && qs->action != TAGS) {
758 			commit_msg = commit_msg0;
759 			while (*commit_msg == '\n')
760 				commit_msg++;
761 
762 			new_repo_tag->commit_msg = strdup(commit_msg);
763 			if (new_repo_tag->commit_msg == NULL) {
764 				error = got_error_from_errno("strdup");
765 				free(commit_msg0);
766 				goto err;
767 			}
768 			free(commit_msg0);
769 		}
770 
771 		if (limit && --limit == 0) {
772 			if (chk_multi == 0)
773 				break;
774 			chk_next = 1;
775 		}
776 		free(id);
777 		id = NULL;
778 	}
779 
780 done:
781 	/*
782 	 * we have tailq populated, so find previous commit id
783 	 * for navigation through briefs and commits
784 	 */
785 	if (t->tag_count == 0) {
786 		TAILQ_FOREACH_SAFE(rt, &t->repo_tags, entry, trt) {
787 			TAILQ_REMOVE(&t->repo_tags, rt, entry);
788 			gotweb_free_repo_tag(rt);
789 		}
790 	}
791 	if (t->tag_count > 0 && t->prev_id == NULL && qs->commit != NULL) {
792 		commit_found = 0;
793 		TAILQ_FOREACH_REVERSE(rt, &t->repo_tags, repo_tags_head,
794 		    entry) {
795 			if (commit_found == 0 && rt->commit_id != NULL &&
796 			    strcmp(qs->commit, rt->commit_id) != 0) {
797 				continue;
798 			} else
799 				commit_found = 1;
800 			if (c_cnt == srv->max_commits_display ||
801 			    rt == TAILQ_FIRST(&t->repo_tags)) {
802 				t->prev_id = strdup(rt->commit_id);
803 				if (t->prev_id == NULL)
804 					error = got_error_from_errno("strdup");
805 				break;
806 			}
807 			c_cnt++;
808 		}
809 	}
810 err:
811 	if (commit)
812 		got_object_commit_close(commit);
813 	got_ref_list_free(&refs);
814 	free(repo_path);
815 	free(id);
816 	return error;
817 }
818 
819 const struct got_error *
820 got_output_repo_tree(struct request *c)
821 {
822 	const struct got_error *error = NULL;
823 	struct transport *t = c->t;
824 	struct got_commit_object *commit = NULL;
825 	struct got_repository *repo = t->repo;
826 	struct querystring *qs = t->qs;
827 	struct repo_commit *rc = NULL;
828 	struct got_object_id *tree_id = NULL, *commit_id = NULL;
829 	struct got_reflist_head refs;
830 	struct got_tree_object *tree = NULL;
831 	struct repo_dir *repo_dir = t->repo_dir;
832 	const char *name, *index_page_str, *folder;
833 	char *id_str = NULL, *escaped_name;
834 	char *path = NULL, *in_repo_path = NULL, *modestr = NULL;
835 	int nentries, i, r;
836 
837 	TAILQ_INIT(&refs);
838 
839 	rc = TAILQ_FIRST(&t->repo_commits);
840 
841 	if (qs->folder != NULL) {
842 		path = strdup(qs->folder);
843 		if (path == NULL) {
844 			error = got_error_from_errno("strdup");
845 			goto done;
846 		}
847 	} else {
848 		error = got_repo_map_path(&in_repo_path, repo, repo_dir->path);
849 		if (error)
850 			goto done;
851 		free(path);
852 		path = in_repo_path;
853 	}
854 
855 	error = got_repo_match_object_id(&commit_id, NULL, rc->commit_id,
856 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
857 	if (error)
858 		goto done;
859 
860 	error = got_object_open_as_commit(&commit, repo, commit_id);
861 	if (error)
862 		goto done;
863 
864 	error = got_object_id_by_path(&tree_id, repo, commit, path);
865 	if (error)
866 		goto done;
867 
868 	error = got_object_open_as_tree(&tree, repo, tree_id);
869 	if (error)
870 		goto done;
871 
872 	nentries = got_object_tree_get_nentries(tree);
873 
874 	index_page_str = qs->index_page_str ? qs->index_page_str : "";
875 	folder = qs->folder ? qs->folder : "";
876 
877 	for (i = 0; i < nentries; i++) {
878 		struct got_tree_entry *te;
879 		mode_t mode;
880 
881 		te = got_object_tree_get_entry(tree, i);
882 
883 		error = got_object_id_str(&id_str, got_tree_entry_get_id(te));
884 		if (error)
885 			goto done;
886 
887 		modestr = strdup("");
888 		if (modestr == NULL) {
889 			error = got_error_from_errno("strdup");
890 			goto done;
891 		}
892 		mode = got_tree_entry_get_mode(te);
893 		if (got_object_tree_entry_is_submodule(te)) {
894 			free(modestr);
895 			modestr = strdup("$");
896 			if (modestr == NULL) {
897 				error = got_error_from_errno("strdup");
898 				goto done;
899 			}
900 		} else if (S_ISLNK(mode)) {
901 			free(modestr);
902 			modestr = strdup("@");
903 			if (modestr == NULL) {
904 				error = got_error_from_errno("strdup");
905 				goto done;
906 			}
907 		} else if (S_ISDIR(mode)) {
908 			free(modestr);
909 			modestr = strdup("/");
910 			if (modestr == NULL) {
911 				error = got_error_from_errno("strdup");
912 				goto done;
913 			}
914 		} else if (mode & S_IXUSR) {
915 			free(modestr);
916 			modestr = strdup("*");
917 			if (modestr == NULL) {
918 				error = got_error_from_errno("strdup");
919 				goto done;
920 			}
921 		}
922 
923 		name = got_tree_entry_get_name(te);
924 		error = gotweb_escape_html(&escaped_name, name);
925 		if (error)
926 			goto done;
927 
928 		if (S_ISDIR(mode)) {
929 			r = fcgi_printf(c,
930 			    "<div class='tree_wrapper'>\n"
931 			    "<div class='tree_line'>"
932 			    "<a class='diff_directory' "
933 			    "href='?index_page=%s&path=%s&action=tree"
934 			    "&commit=%s&folder=%s/%s'>%s%s</a>"
935 			    "</div>\n" /* .tree_line */
936 			    "<div class='tree_line_blank'>&nbsp;</div>\n"
937 			    "</div>\n", /* .tree_wrapper */
938 			    index_page_str, qs->path, rc->commit_id,
939 			    folder, name, escaped_name, modestr);
940 			if (r == -1)
941 				goto done;
942 		} else {
943 			r = fcgi_printf(c,
944 			    "<div class='tree_wrapper'>\n"
945 			    "<div class='tree_line'>"
946 			    "<a href='?index_page=%s&path=%s&action=blob"
947 			    "&commit=%s&folder=%s&file=%s'>%s%s</a>"
948 			    "</div>\n" /* .tree_line */
949 			    "<div class='tree_line_blank'>"
950 			    "<a href='?index_page=%s&path=%s&action=commits"
951 			    "&commit=%s&folder=%s&file=%s'>commits</a>\n"
952 			    " | \n"
953 			    "<a href='?index_page=%s&path=%s&action=blame"
954 			    "&commit=%s&folder=%s&file=%s'>blame</a>\n"
955 			    "</div>\n"  /* .tree_line_blank */
956 			    "</div>\n", /* .tree_wrapper */
957 			    index_page_str, qs->path, rc->commit_id,
958 			    folder, name, escaped_name, modestr,
959 			    index_page_str, qs->path, rc->commit_id,
960 			    folder, name,
961 			    index_page_str, qs->path, rc->commit_id,
962 			    folder, name);
963 			if (r == -1)
964 				goto done;
965 		}
966 		free(id_str);
967 		id_str = NULL;
968 		free(modestr);
969 		modestr = NULL;
970 	}
971 done:
972 	free(id_str);
973 	free(modestr);
974 	free(path);
975 	got_ref_list_free(&refs);
976 	if (commit)
977 		got_object_commit_close(commit);
978 	free(commit_id);
979 	free(tree_id);
980 	return error;
981 }
982 
983 const struct got_error *
984 got_output_file_blob(struct request *c)
985 {
986 	const struct got_error *error = NULL;
987 	struct transport *t = c->t;
988 	struct got_repository *repo = t->repo;
989 	struct querystring *qs = c->t->qs;
990 	struct got_commit_object *commit = NULL;
991 	struct got_object_id *commit_id = NULL;
992 	struct got_reflist_head refs;
993 	struct got_blob_object *blob = NULL;
994 	char *path = NULL, *in_repo_path = NULL;
995 	int obj_type, set_mime = 0, fd = -1;
996 	size_t len, hdrlen;
997 	const uint8_t *buf;
998 
999 	TAILQ_INIT(&refs);
1000 
1001 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1002 	    qs->folder ? "/" : "", qs->file) == -1) {
1003 		error = got_error_from_errno("asprintf");
1004 		goto done;
1005 	}
1006 
1007 	error = got_repo_map_path(&in_repo_path, repo, path);
1008 	if (error)
1009 		goto done;
1010 
1011 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1012 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1013 	if (error)
1014 		goto done;
1015 
1016 	error = got_object_open_as_commit(&commit, repo, commit_id);
1017 	if (error)
1018 		goto done;
1019 
1020 	error = got_object_id_by_path(&commit_id, repo, commit, in_repo_path);
1021 	if (error)
1022 		goto done;
1023 
1024 	if (commit_id == NULL) {
1025 		error = got_error(GOT_ERR_NO_OBJ);
1026 		goto done;
1027 	}
1028 
1029 	error = got_object_get_type(&obj_type, repo, commit_id);
1030 	if (error)
1031 		goto done;
1032 
1033 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1034 		error = got_error(GOT_ERR_OBJ_TYPE);
1035 		goto done;
1036 	}
1037 
1038 	error = got_gotweb_dupfd(&c->priv_fd[BLOB_FD_1], &fd);
1039 	if (error)
1040 		goto done;
1041 
1042 	error = got_object_open_as_blob(&blob, repo, commit_id, BUF, fd);
1043 	if (error)
1044 		goto done;
1045 	hdrlen = got_object_blob_get_hdrlen(blob);
1046 	do {
1047 		error = got_object_blob_read_block(&len, blob);
1048 		if (error)
1049 			goto done;
1050 		buf = got_object_blob_get_read_buf(blob);
1051 
1052 		/*
1053 		 * Skip blob object header first time around,
1054 		 * which also contains a zero byte.
1055 		 */
1056 		buf += hdrlen;
1057 		if (set_mime == 0) {
1058 			if (isbinary(buf, len - hdrlen)) {
1059 				error = gotweb_render_content_type_file(c,
1060 				    "application/octet-stream",
1061 				    qs->file);
1062 				if (error) {
1063 					log_warnx("%s: %s", __func__,
1064 					    error->msg);
1065 					goto done;
1066 				}
1067 			} else {
1068 				error = gotweb_render_content_type(c,
1069 				  "text/plain");
1070 				if (error) {
1071 					log_warnx("%s: %s", __func__,
1072 					    error->msg);
1073 					goto done;
1074 				}
1075 			}
1076 		}
1077 		set_mime = 1;
1078 		fcgi_gen_binary_response(c, buf, len - hdrlen);
1079 
1080 		hdrlen = 0;
1081 	} while (len != 0);
1082 done:
1083 	if (commit)
1084 		got_object_commit_close(commit);
1085 	if (fd != -1 && close(fd) == -1 && error == NULL)
1086 		error = got_error_from_errno("close");
1087 	if (blob)
1088 		got_object_blob_close(blob);
1089 	free(in_repo_path);
1090 	free(commit_id);
1091 	free(path);
1092 	return error;
1093 }
1094 
1095 struct blame_line {
1096 	int annotated;
1097 	char *id_str;
1098 	char *committer;
1099 	char datebuf[11]; /* YYYY-MM-DD + NUL */
1100 };
1101 
1102 struct blame_cb_args {
1103 	struct blame_line *lines;
1104 	int nlines;
1105 	int nlines_prec;
1106 	int lineno_cur;
1107 	off_t *line_offsets;
1108 	FILE *f;
1109 	struct got_repository *repo;
1110 	struct request *c;
1111 };
1112 
1113 static const struct got_error *
1114 got_gotweb_blame_cb(void *arg, int nlines, int lineno,
1115     struct got_commit_object *commit, struct got_object_id *id)
1116 {
1117 	const struct got_error *err = NULL;
1118 	struct blame_cb_args *a = arg;
1119 	struct blame_line *bline;
1120 	struct request *c = a->c;
1121 	struct transport *t = c->t;
1122 	struct querystring *qs = t->qs;
1123 	struct repo_dir *repo_dir = t->repo_dir;
1124 	const char *index_page_str;
1125 	char *line = NULL, *eline = NULL;
1126 	size_t linesize = 0;
1127 	off_t offset;
1128 	struct tm tm;
1129 	time_t committer_time;
1130 	int r;
1131 
1132 	if (nlines != a->nlines ||
1133 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
1134 		return got_error(GOT_ERR_RANGE);
1135 
1136 	if (lineno == -1)
1137 		return NULL; /* no change in this commit */
1138 
1139 	/* Annotate this line. */
1140 	bline = &a->lines[lineno - 1];
1141 	if (bline->annotated)
1142 		return NULL;
1143 	err = got_object_id_str(&bline->id_str, id);
1144 	if (err)
1145 		return err;
1146 
1147 	bline->committer = strdup(got_object_commit_get_committer(commit));
1148 	if (bline->committer == NULL) {
1149 		err = got_error_from_errno("strdup");
1150 		goto done;
1151 	}
1152 
1153 	committer_time = got_object_commit_get_committer_time(commit);
1154 	if (gmtime_r(&committer_time, &tm) == NULL)
1155 		return got_error_from_errno("gmtime_r");
1156 	if (strftime(bline->datebuf, sizeof(bline->datebuf), "%G-%m-%d",
1157 	    &tm) == 0) {
1158 		err = got_error(GOT_ERR_NO_SPACE);
1159 		goto done;
1160 	}
1161 	bline->annotated = 1;
1162 
1163 	/* Print lines annotated so far. */
1164 	bline = &a->lines[a->lineno_cur - 1];
1165 	if (!bline->annotated)
1166 		goto done;
1167 
1168 	offset = a->line_offsets[a->lineno_cur - 1];
1169 	if (fseeko(a->f, offset, SEEK_SET) == -1) {
1170 		err = got_error_from_errno("fseeko");
1171 		goto done;
1172 	}
1173 
1174 	index_page_str = qs->index_page_str ? qs->index_page_str : "";
1175 
1176 	while (a->lineno_cur <= a->nlines && bline->annotated) {
1177 		char *smallerthan, *at, *nl, *committer;
1178 		size_t len;
1179 
1180 		if (getline(&line, &linesize, a->f) == -1) {
1181 			if (ferror(a->f))
1182 				err = got_error_from_errno("getline");
1183 			break;
1184 		}
1185 
1186 		committer = bline->committer;
1187 		smallerthan = strchr(committer, '<');
1188 		if (smallerthan && smallerthan[1] != '\0')
1189 			committer = smallerthan + 1;
1190 		at = strchr(committer, '@');
1191 		if (at)
1192 			*at = '\0';
1193 		len = strlen(committer);
1194 		if (len >= 9)
1195 			committer[8] = '\0';
1196 
1197 		nl = strchr(line, '\n');
1198 		if (nl)
1199 			*nl = '\0';
1200 
1201 		err = gotweb_escape_html(&eline, line);
1202 		if (err)
1203 			goto done;
1204 
1205 		r = fcgi_printf(c, "<div class='blame_wrapper'>"
1206 		    "<div class='blame_number'>%.*d</div>"
1207 		    "<div class='blame_hash'>"
1208 		    "<a href='?index_page=%s&path=%s&action=diff&commit=%s'>"
1209 		    "%.8s</a>"
1210 		    "</div>"
1211 		    "<div class='blame_date'>%s</div>"
1212 		    "<div class='blame_author'>%s</div>"
1213 		    "<div class='blame_code'>%s</div>"
1214 		    "</div>",	/* .blame_wrapper */
1215 		    a->nlines_prec, a->lineno_cur,
1216 		    index_page_str, repo_dir->name, bline->id_str,
1217 		    bline->id_str,
1218 		    bline->datebuf,
1219 		    committer,
1220 		    eline);
1221 		if (r == -1)
1222 			goto done;
1223 
1224 		a->lineno_cur++;
1225 		bline = &a->lines[a->lineno_cur - 1];
1226 	}
1227 done:
1228 	free(line);
1229 	free(eline);
1230 	return err;
1231 }
1232 
1233 const struct got_error *
1234 got_output_file_blame(struct request *c)
1235 {
1236 	const struct got_error *error = NULL;
1237 	struct transport *t = c->t;
1238 	struct got_repository *repo = t->repo;
1239 	struct querystring *qs = c->t->qs;
1240 	struct got_object_id *obj_id = NULL, *commit_id = NULL;
1241 	struct got_commit_object *commit = NULL;
1242 	struct got_reflist_head refs;
1243 	struct got_blob_object *blob = NULL;
1244 	char *path = NULL, *in_repo_path = NULL;
1245 	struct blame_cb_args bca;
1246 	int i, obj_type, fd1 = -1, fd2 = -1, fd3 = -1, fd4 = -1, fd5 = -1;
1247 	int fd6 = -1;
1248 	off_t filesize;
1249 	FILE *f1 = NULL, *f2 = NULL;
1250 
1251 	TAILQ_INIT(&refs);
1252 	bca.f = NULL;
1253 	bca.lines = NULL;
1254 
1255 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1256 	    qs->folder ? "/" : "", qs->file) == -1) {
1257 		error = got_error_from_errno("asprintf");
1258 		goto done;
1259 	}
1260 
1261 	error = got_repo_map_path(&in_repo_path, repo, path);
1262 	if (error)
1263 		goto done;
1264 
1265 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1266 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1267 	if (error)
1268 		goto done;
1269 
1270 	error = got_object_open_as_commit(&commit, repo, commit_id);
1271 	if (error)
1272 		goto done;
1273 
1274 	error = got_object_id_by_path(&obj_id, repo, commit, in_repo_path);
1275 	if (error)
1276 		goto done;
1277 
1278 	if (commit_id == NULL) {
1279 		error = got_error(GOT_ERR_NO_OBJ);
1280 		goto done;
1281 	}
1282 
1283 	error = got_object_get_type(&obj_type, repo, obj_id);
1284 	if (error)
1285 		goto done;
1286 
1287 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1288 		error = got_error(GOT_ERR_OBJ_TYPE);
1289 		goto done;
1290 	}
1291 
1292 	error = got_gotweb_openfile(&bca.f, &c->priv_fd[BLAME_FD_1], &fd1);
1293 	if (error)
1294 		goto done;
1295 
1296 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_2], &fd2);
1297 	if (error)
1298 		goto done;
1299 
1300 	error = got_object_open_as_blob(&blob, repo, obj_id, BUF, fd2);
1301 	if (error)
1302 		goto done;
1303 
1304 	error = got_object_blob_dump_to_file(&filesize, &bca.nlines,
1305 	    &bca.line_offsets, bca.f, blob);
1306 	if (error || bca.nlines == 0)
1307 		goto done;
1308 
1309 	/* Don't include \n at EOF in the blame line count. */
1310 	if (bca.line_offsets[bca.nlines - 1] == filesize)
1311 		bca.nlines--;
1312 
1313 	bca.lines = calloc(bca.nlines, sizeof(*bca.lines));
1314 	if (bca.lines == NULL) {
1315 		error = got_error_from_errno("calloc");
1316 		goto done;
1317 	}
1318 	bca.lineno_cur = 1;
1319 	bca.nlines_prec = 0;
1320 	i = bca.nlines;
1321 	while (i > 0) {
1322 		i /= 10;
1323 		bca.nlines_prec++;
1324 	}
1325 	bca.repo = repo;
1326 	bca.c = c;
1327 
1328 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_3], &fd3);
1329 	if (error)
1330 		goto done;
1331 
1332 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_4], &fd4);
1333 	if (error)
1334 		goto done;
1335 
1336 	error = got_gotweb_openfile(&f1, &c->priv_fd[BLAME_FD_5], &fd5);
1337 	if (error)
1338 		goto done;
1339 
1340 	error = got_gotweb_openfile(&f2, &c->priv_fd[BLAME_FD_6], &fd6);
1341 	if (error)
1342 		goto done;
1343 
1344 	error = got_blame(in_repo_path, commit_id, repo,
1345 	    GOT_DIFF_ALGORITHM_MYERS, got_gotweb_blame_cb, &bca, NULL, NULL,
1346 	    fd3, fd4, f1, f2);
1347 
1348 	if (blob) {
1349 		free(bca.line_offsets);
1350 		for (i = 0; i < bca.nlines; i++) {
1351 			struct blame_line *bline = &bca.lines[i];
1352 			free(bline->id_str);
1353 			free(bline->committer);
1354 		}
1355 	}
1356 done:
1357 	free(bca.lines);
1358 	if (fd2 != -1 && close(fd2) == -1 && error == NULL)
1359 		error = got_error_from_errno("close");
1360 	if (fd3 != -1 && close(fd3) == -1 && error == NULL)
1361 		error = got_error_from_errno("close");
1362 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1363 		error = got_error_from_errno("close");
1364 	if (bca.f) {
1365 		const struct got_error *bca_err =
1366 		    got_gotweb_flushfile(bca.f, fd1);
1367 		if (error == NULL)
1368 			error = bca_err;
1369 	}
1370 	if (f1) {
1371 		const struct got_error *f1_err =
1372 		    got_gotweb_flushfile(f1, fd5);
1373 		if (error == NULL)
1374 			error = f1_err;
1375 	}
1376 	if (f2) {
1377 		const struct got_error *f2_err =
1378 		    got_gotweb_flushfile(f2, fd6);
1379 		if (error == NULL)
1380 			error = f2_err;
1381 	}
1382 	if (commit)
1383 		got_object_commit_close(commit);
1384 	if (blob)
1385 		got_object_blob_close(blob);
1386 	free(in_repo_path);
1387 	free(commit_id);
1388 	free(path);
1389 	return error;
1390 }
1391 
1392 const struct got_error *
1393 got_output_repo_diff(struct request *c)
1394 {
1395 	const struct got_error *error = NULL;
1396 	struct transport *t = c->t;
1397 	struct got_repository *repo = t->repo;
1398 	struct repo_commit *rc = NULL;
1399 	struct got_object_id *id1 = NULL, *id2 = NULL;
1400 	struct got_reflist_head refs;
1401 	FILE *f1 = NULL, *f2 = NULL, *f3 = NULL;
1402 	char *label1 = NULL, *label2 = NULL, *line = NULL;
1403 	char *newline, *eline = NULL, *color = NULL;
1404 	int obj_type, fd1, fd2, fd3, fd4 = -1, fd5 = -1;
1405 	size_t linesize = 0;
1406 	ssize_t linelen;
1407 	int wrlen = 0;
1408 
1409 	TAILQ_INIT(&refs);
1410 
1411 	error = got_gotweb_openfile(&f1, &c->priv_fd[DIFF_FD_1], &fd1);
1412 	if (error)
1413 		return error;
1414 
1415 	error = got_gotweb_openfile(&f2, &c->priv_fd[DIFF_FD_2], &fd2);
1416 	if (error)
1417 		return error;
1418 
1419 	error = got_gotweb_openfile(&f3, &c->priv_fd[DIFF_FD_3], &fd3);
1420 	if (error)
1421 		return error;
1422 
1423 	rc = TAILQ_FIRST(&t->repo_commits);
1424 
1425 	if (rc->parent_id != NULL &&
1426 	    strncmp(rc->parent_id, "/dev/null", 9) != 0) {
1427 		error = got_repo_match_object_id(&id1, &label1,
1428 		    rc->parent_id, GOT_OBJ_TYPE_ANY,
1429 		    &refs, repo);
1430 		if (error)
1431 			goto done;
1432 	}
1433 
1434 	error = got_repo_match_object_id(&id2, &label2, rc->commit_id,
1435 	    GOT_OBJ_TYPE_ANY, &refs, repo);
1436 	if (error)
1437 		goto done;
1438 
1439 	error = got_object_get_type(&obj_type, repo, id2);
1440 	if (error)
1441 		goto done;
1442 
1443 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_4], &fd4);
1444 	if (error)
1445 		goto done;
1446 
1447 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_5], &fd5);
1448 	if (error)
1449 		goto done;
1450 
1451 	switch (obj_type) {
1452 	case GOT_OBJ_TYPE_BLOB:
1453 		error = got_diff_objects_as_blobs(NULL, NULL, f1, f2, fd4, fd5,
1454 		     id1, id2, NULL, NULL, GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1455 		     repo, f3);
1456 		break;
1457 	case GOT_OBJ_TYPE_TREE:
1458 		error = got_diff_objects_as_trees(NULL, NULL, f1, f2, fd4, fd5,
1459 		    id1, id2, NULL, "", "",  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1460 		    repo, f3);
1461 		break;
1462 	case GOT_OBJ_TYPE_COMMIT:
1463 		error = got_diff_objects_as_commits(NULL, NULL, f1, f2, fd4,
1464 		    fd5, id1, id2, NULL,  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1465 		    repo, f3);
1466 		break;
1467 	default:
1468 		error = got_error(GOT_ERR_OBJ_TYPE);
1469 	}
1470 	if (error)
1471 		goto done;
1472 
1473 	if (fseek(f1, 0, SEEK_SET) == -1) {
1474 		error = got_ferror(f1, GOT_ERR_IO);
1475 		goto done;
1476 	}
1477 
1478 	if (fseek(f2, 0, SEEK_SET) == -1) {
1479 		error = got_ferror(f2, GOT_ERR_IO);
1480 		goto done;
1481 	}
1482 
1483 	if (fseek(f3, 0, SEEK_SET) == -1) {
1484 		error = got_ferror(f3, GOT_ERR_IO);
1485 		goto done;
1486 	}
1487 
1488 	while ((linelen = getline(&line, &linesize, f3)) != -1) {
1489 		if (strncmp(line, "-", 1) == 0) {
1490 			color = strdup("diff_minus");
1491 			if (color == NULL) {
1492 				error = got_error_from_errno("strdup");
1493 				goto done;
1494 			}
1495 		} else if (strncmp(line, "+", 1) == 0) {
1496 			color = strdup("diff_plus");
1497 			if (color == NULL) {
1498 				error = got_error_from_errno("strdup");
1499 				goto done;
1500 			}
1501 		} else if (strncmp(line, "@@", 2) == 0) {
1502 			color = strdup("diff_chunk_header");
1503 			if (color == NULL) {
1504 				error = got_error_from_errno("strdup");
1505 				goto done;
1506 			}
1507 		} else if (strncmp(line, "@@", 2) == 0) {
1508 			color = strdup("diff_chunk_header");
1509 			if (color == NULL) {
1510 				error = got_error_from_errno("strdup");
1511 				goto done;
1512 			}
1513 		} else if (strncmp(line, "commit +", 8) == 0) {
1514 			color = strdup("diff_meta");
1515 			if (color == NULL) {
1516 				error = got_error_from_errno("strdup");
1517 				goto done;
1518 			}
1519 		} else if (strncmp(line, "commit -", 8) == 0) {
1520 			color = strdup("diff_meta");
1521 			if (color == NULL) {
1522 				error = got_error_from_errno("strdup");
1523 				goto done;
1524 			}
1525 		} else if (strncmp(line, "blob +", 6) == 0) {
1526 			color = strdup("diff_meta");
1527 			if (color == NULL) {
1528 				error = got_error_from_errno("strdup");
1529 				goto done;
1530 			}
1531 		} else if (strncmp(line, "blob -", 6) == 0) {
1532 			color = strdup("diff_meta");
1533 			if (color == NULL) {
1534 				error = got_error_from_errno("strdup");
1535 				goto done;
1536 			}
1537 		} else if (strncmp(line, "file +", 6) == 0) {
1538 			color = strdup("diff_meta");
1539 			if (color == NULL) {
1540 				error = got_error_from_errno("strdup");
1541 				goto done;
1542 			}
1543 		} else if (strncmp(line, "file -", 6) == 0) {
1544 			color = strdup("diff_meta");
1545 			if (color == NULL) {
1546 				error = got_error_from_errno("strdup");
1547 				goto done;
1548 			}
1549 		} else if (strncmp(line, "from:", 5) == 0) {
1550 			color = strdup("diff_author");
1551 			if (color == NULL) {
1552 				error = got_error_from_errno("strdup");
1553 				goto done;
1554 			}
1555 		} else if (strncmp(line, "via:", 4) == 0) {
1556 			color = strdup("diff_author");
1557 			if (color == NULL) {
1558 				error = got_error_from_errno("strdup");
1559 				goto done;
1560 			}
1561 		} else if (strncmp(line, "date:", 5) == 0) {
1562 			color = strdup("diff_date");
1563 			if (color == NULL) {
1564 				error = got_error_from_errno("strdup");
1565 				goto done;
1566 			}
1567 		}
1568 
1569 		newline = strchr(line, '\n');
1570 		if (newline)
1571 			*newline = '\0';
1572 
1573 		error = gotweb_escape_html(&eline, line);
1574 		if (error)
1575 			goto done;
1576 
1577 		fcgi_printf(c, "<div class='diff_line %s'>%s</div>\n",
1578 		    color ? color : "", eline);
1579 		free(eline);
1580 		eline = NULL;
1581 
1582 		if (linelen > 0)
1583 			wrlen = wrlen + linelen;
1584 		free(color);
1585 		color = NULL;
1586 	}
1587 	if (linelen == -1 && ferror(f3))
1588 		error = got_error_from_errno("getline");
1589 done:
1590 	free(color);
1591 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1592 		error = got_error_from_errno("close");
1593 	if (fd5 != -1 && close(fd5) == -1 && error == NULL)
1594 		error = got_error_from_errno("close");
1595 	if (f1) {
1596 		const struct got_error *f1_err =
1597 		    got_gotweb_flushfile(f1, fd1);
1598 		if (error == NULL)
1599 			error = f1_err;
1600 	}
1601 	if (f2) {
1602 		const struct got_error *f2_err =
1603 		    got_gotweb_flushfile(f2, fd2);
1604 		if (error == NULL)
1605 			error = f2_err;
1606 	}
1607 	if (f3) {
1608 		const struct got_error *f3_err =
1609 		    got_gotweb_flushfile(f3, fd3);
1610 		if (error == NULL)
1611 			error = f3_err;
1612 	}
1613 	got_ref_list_free(&refs);
1614 	free(line);
1615 	free(eline);
1616 	free(label1);
1617 	free(label2);
1618 	free(id1);
1619 	free(id2);
1620 	return error;
1621 }
1622 
1623 static const struct got_error *
1624 got_init_repo_commit(struct repo_commit **rc)
1625 {
1626 	const struct got_error *error = NULL;
1627 
1628 	*rc = calloc(1, sizeof(**rc));
1629 	if (*rc == NULL)
1630 		return got_error_from_errno2("%s: calloc", __func__);
1631 
1632 	(*rc)->path = NULL;
1633 	(*rc)->refs_str = NULL;
1634 	(*rc)->commit_id = NULL;
1635 	(*rc)->committer = NULL;
1636 	(*rc)->author = NULL;
1637 	(*rc)->parent_id = NULL;
1638 	(*rc)->tree_id = NULL;
1639 	(*rc)->commit_msg = NULL;
1640 
1641 	return error;
1642 }
1643 
1644 static const struct got_error *
1645 got_init_repo_tag(struct repo_tag **rt)
1646 {
1647 	const struct got_error *error = NULL;
1648 
1649 	*rt = calloc(1, sizeof(**rt));
1650 	if (*rt == NULL)
1651 		return got_error_from_errno2("%s: calloc", __func__);
1652 
1653 	(*rt)->commit_id = NULL;
1654 	(*rt)->tag_name = NULL;
1655 	(*rt)->tag_commit = NULL;
1656 	(*rt)->commit_msg = NULL;
1657 	(*rt)->tagger = NULL;
1658 
1659 	return error;
1660 }