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 = NULL;
335 	struct repo_commit *repo_commit = NULL;
336 	struct server *srv = c->srv;
337 	struct transport *t = c->t;
338 	struct got_repository *repo = t->repo;
339 	struct querystring *qs = t->qs;
340 	struct repo_dir *repo_dir = t->repo_dir;
341 	char *in_repo_path = NULL, *repo_path = NULL, *file_path = NULL;
342 	int chk_next = 0, chk_multi = 0, commit_found = 0;
343 	int obj_type, limit_chk = 0;
344 
345 	TAILQ_INIT(&refs);
346 
347 	if (qs->file != NULL && strlen(qs->file) > 0)
348 		if (asprintf(&file_path, "%s/%s", qs->folder ? qs->folder : "",
349 		    qs->file) == -1)
350 			return got_error_from_errno("asprintf");
351 
352 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
353 	    repo_dir->name) == -1) {
354 		error = got_error_from_errno("asprintf");
355 		goto done;
356 	}
357 
358 	/*
359 	 * XXX: jumping directly to a commit id via
360 	 * got_repo_match_object_id_prefix significantly improves performance,
361 	 * but does not allow us to create a PREVIOUS button, since commits can
362 	 * only be itereated forward. So, we have to match as we iterate from
363 	 * the headref.
364 	 */
365 	if (qs->action == BRIEFS || qs->action == COMMITS ||
366 	    (qs->action == TREE && qs->commit == NULL)) {
367 		error = got_ref_open(&ref, repo, qs->headref, 0);
368 		if (error)
369 			goto done;
370 
371 		error = got_ref_resolve(&id, repo, ref);
372 		if (error)
373 			goto done;
374 	} else if (qs->commit != NULL) {
375 		error = got_ref_open(&ref, repo, qs->commit, 0);
376 		if (error == NULL) {
377 			error = got_ref_resolve(&id, repo, ref);
378 			if (error)
379 				goto done;
380 			error = got_object_get_type(&obj_type, repo, id);
381 			if (error)
382 				goto done;
383 			if (obj_type == GOT_OBJ_TYPE_TAG) {
384 				struct got_tag_object *tag;
385 				error = got_object_open_as_tag(&tag, repo, id);
386 				if (error)
387 					goto done;
388 				if (got_object_tag_get_object_type(tag) !=
389 				    GOT_OBJ_TYPE_COMMIT) {
390 					got_object_tag_close(tag);
391 					error = got_error(GOT_ERR_OBJ_TYPE);
392 					goto done;
393 				}
394 				free(id);
395 				id = got_object_id_dup(
396 				    got_object_tag_get_object_id(tag));
397 				if (id == NULL)
398 					error = got_error_from_errno(
399 					    "got_object_id_dup");
400 				got_object_tag_close(tag);
401 				if (error)
402 					goto done;
403 			} else if (obj_type != GOT_OBJ_TYPE_COMMIT) {
404 				error = got_error(GOT_ERR_OBJ_TYPE);
405 				goto done;
406 			}
407 		}
408 		error = got_repo_match_object_id_prefix(&id, qs->commit,
409 		    GOT_OBJ_TYPE_COMMIT, repo);
410 		if (error)
411 			goto done;
412 	}
413 
414 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
415 	if (error)
416 		goto done;
417 
418 	error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name, NULL);
419 	if (error)
420 		goto done;
421 
422 	if (qs->file != NULL && strlen(qs->file) > 0) {
423 		error = got_commit_graph_open(&graph, file_path, 0);
424 		if (error)
425 			goto done;
426 	} else {
427 		error = got_commit_graph_open(&graph, in_repo_path, 0);
428 		if (error)
429 			goto done;
430 	}
431 
432 	error = got_commit_graph_iter_start(graph, id, repo, NULL, NULL);
433 	if (error)
434 		goto done;
435 
436 	for (;;) {
437 		struct got_object_id *next_id;
438 
439 		if (limit_chk == ((limit * qs->page) - (limit - 1)) &&
440 		    commit_found == 0 && repo_commit &&
441 		    repo_commit->commit_id != NULL) {
442 			t->prev_id = strdup(repo_commit->commit_id);
443 			if (t->prev_id == NULL) {
444 				error = got_error_from_errno("strdup");
445 				goto done;
446 			}
447 		}
448 
449 		error = got_commit_graph_iter_next(&next_id, graph, repo, NULL,
450 		    NULL);
451 		if (error) {
452 			if (error->code == GOT_ERR_ITER_COMPLETED)
453 				error = NULL;
454 			goto done;
455 		}
456 
457 		error = got_object_open_as_commit(&commit, repo, next_id);
458 		if (error)
459 			goto done;
460 
461 		error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name,
462 		    NULL);
463 		if (error)
464 			goto done;
465 
466 		error = got_init_repo_commit(&repo_commit);
467 		if (error)
468 			goto done;
469 
470 		TAILQ_INSERT_TAIL(&t->repo_commits, repo_commit, entry);
471 
472 		error = got_get_repo_commit(c, repo_commit, commit,
473 		    &refs, next_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 				continue;
486 			}
487 		}
488 
489 		if (limit == 1 && chk_multi == 0 &&
490 		    srv->max_commits_display != 1)
491 			commit_found = 1;
492 		else {
493 			chk_multi = 1;
494 
495 			/*
496 			 * check for one more commit before breaking,
497 			 * so we know whether to navigate through briefs
498 			 * commits and summary
499 			 */
500 			if (chk_next && (qs->action == BRIEFS ||
501 			    qs->action == COMMITS || qs->action == SUMMARY)) {
502 				t->next_id = strdup(repo_commit->commit_id);
503 				if (t->next_id == NULL) {
504 					error = got_error_from_errno("strdup");
505 					goto done;
506 				}
507 				if (commit) {
508 					got_object_commit_close(commit);
509 					commit = NULL;
510 				}
511 				TAILQ_REMOVE(&t->repo_commits, repo_commit,
512 				    entry);
513 				gotweb_free_repo_commit(repo_commit);
514 				goto done;
515 			}
516 		}
517 		got_ref_list_free(&refs);
518 		if (error || (limit && --limit == 0)) {
519 			if (commit_found || (qs->file != NULL &&
520 			    strlen(qs->file) > 0))
521 				if (chk_multi == 0)
522 					break;
523 			chk_next = 1;
524 		}
525 		if (commit) {
526 			got_object_commit_close(commit);
527 			commit = NULL;
528 		}
529 	}
530 done:
531 	if (ref)
532 		got_ref_close(ref);
533 	if (commit)
534 		got_object_commit_close(commit);
535 	if (graph)
536 		got_commit_graph_close(graph);
537 	got_ref_list_free(&refs);
538 	free(in_repo_path);
539 	free(file_path);
540 	free(repo_path);
541 	free(id);
542 	return error;
543 }
544 
545 const struct got_error *
546 got_get_repo_tags(struct request *c, int limit)
547 {
548 	const struct got_error *error = NULL;
549 	struct got_object_id *id = NULL;
550 	struct got_commit_object *commit = NULL;
551 	struct got_reflist_head refs;
552 	struct got_reference *ref;
553 	struct got_reflist_entry *re;
554 	struct server *srv = c->srv;
555 	struct transport *t = c->t;
556 	struct got_repository *repo = t->repo;
557 	struct querystring *qs = t->qs;
558 	struct repo_dir *repo_dir = t->repo_dir;
559 	struct got_tag_object *tag = NULL;
560 	struct repo_tag *rt = NULL, *trt = NULL;
561 	char *in_repo_path = NULL, *repo_path = NULL, *id_str = NULL;
562 	char *tag_commit = NULL, *tag_commit0 = NULL;
563 	char *commit_msg = NULL, *commit_msg0 = NULL;
564 	int chk_next = 0, chk_multi = 1, commit_found = 0, c_cnt = 0;
565 
566 	TAILQ_INIT(&refs);
567 
568 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
569 	    repo_dir->name) == -1)
570 		return got_error_from_errno("asprintf");
571 
572 	if (qs->commit == NULL && qs->action == TAGS) {
573 		error = got_ref_open(&ref, repo, qs->headref, 0);
574 		if (error)
575 			goto err;
576 		error = got_ref_resolve(&id, repo, ref);
577 		got_ref_close(ref);
578 		if (error)
579 			goto err;
580 	} else if (qs->commit == NULL && qs->action == TAG) {
581 		error = got_error_msg(GOT_ERR_EOF, "commit id missing");
582 		goto err;
583 	} else {
584 		error = got_repo_match_object_id_prefix(&id, qs->commit,
585 		    GOT_OBJ_TYPE_COMMIT, repo);
586 		if (error)
587 			goto err;
588 	}
589 
590 	if (qs->action != SUMMARY && qs->action != TAGS) {
591 		error = got_object_open_as_commit(&commit, repo, id);
592 		if (error)
593 			goto err;
594 		error = got_object_commit_get_logmsg(&commit_msg0, commit);
595 		if (error)
596 			goto err;
597 		if (commit) {
598 			got_object_commit_close(commit);
599 			commit = NULL;
600 		}
601 	}
602 
603 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
604 	if (error)
605 		goto err;
606 
607 	error = got_ref_list(&refs, repo, "refs/tags", got_ref_cmp_tags,
608 	   repo);
609 	if (error)
610 		goto err;
611 
612 	if (limit == 1)
613 		chk_multi = 0;
614 
615 	/*
616 	 * XXX: again, see previous message about caching
617 	 */
618 
619 	TAILQ_FOREACH(re, &refs, entry) {
620 		struct repo_tag *new_repo_tag = NULL;
621 		error = got_init_repo_tag(&new_repo_tag);
622 		if (error)
623 			goto err;
624 
625 		TAILQ_INSERT_TAIL(&t->repo_tags, new_repo_tag, entry);
626 
627 		new_repo_tag->tag_name = strdup(got_ref_get_name(re->ref));
628 		if (new_repo_tag->tag_name == NULL) {
629 			error = got_error_from_errno("strdup");
630 			goto err;
631 		}
632 
633 		free(id);
634 		id = NULL;
635 
636 		free(id_str);
637 		id_str = NULL;
638 
639 		error = got_ref_resolve(&id, repo, re->ref);
640 		if (error)
641 			goto done;
642 
643 		if (tag)
644 			got_object_tag_close(tag);
645 		error = got_object_open_as_tag(&tag, repo, id);
646 		if (error) {
647 			if (error->code != GOT_ERR_OBJ_TYPE)
648 				goto done;
649 			/* "lightweight" tag */
650 			error = got_object_open_as_commit(&commit, repo, id);
651 			if (error)
652 				goto done;
653 			new_repo_tag->tagger =
654 			    strdup(got_object_commit_get_committer(commit));
655 			if (new_repo_tag->tagger == NULL) {
656 				error = got_error_from_errno("strdup");
657 				goto err;
658 			}
659 			new_repo_tag->tagger_time =
660 			    got_object_commit_get_committer_time(commit);
661 			error = got_object_id_str(&id_str, id);
662 			if (error)
663 				goto err;
664 		} else {
665 			new_repo_tag->tagger =
666 			    strdup(got_object_tag_get_tagger(tag));
667 			if (new_repo_tag->tagger == NULL) {
668 				error = got_error_from_errno("strdup");
669 				goto err;
670 			}
671 			new_repo_tag->tagger_time =
672 			    got_object_tag_get_tagger_time(tag);
673 			error = got_object_id_str(&id_str,
674 			    got_object_tag_get_object_id(tag));
675 			if (error)
676 				goto err;
677 		}
678 
679 		new_repo_tag->commit_id = strdup(id_str);
680 		if (new_repo_tag->commit_id == NULL)
681 			goto err;
682 
683 		if (commit_found == 0 && qs->commit != NULL &&
684 		    strncmp(id_str, qs->commit, strlen(id_str)) != 0)
685 			continue;
686 		else
687 			commit_found = 1;
688 
689 		t->tag_count++;
690 
691 		/*
692 		 * check for one more commit before breaking,
693 		 * so we know whether to navigate through briefs
694 		 * commits and summary
695 		 */
696 		if (chk_next) {
697 			t->next_id = strdup(new_repo_tag->commit_id);
698 			if (t->next_id == NULL) {
699 				error = got_error_from_errno("strdup");
700 				goto err;
701 			}
702 			if (commit) {
703 				got_object_commit_close(commit);
704 				commit = NULL;
705 			}
706 			TAILQ_REMOVE(&t->repo_tags, new_repo_tag, entry);
707 			gotweb_free_repo_tag(new_repo_tag);
708 			goto done;
709 		}
710 
711 		if (commit) {
712 			error = got_object_commit_get_logmsg(&tag_commit0,
713 			    commit);
714 			if (error)
715 				goto err;
716 			got_object_commit_close(commit);
717 			commit = NULL;
718 		} else {
719 			tag_commit0 = strdup(got_object_tag_get_message(tag));
720 			if (tag_commit0 == NULL) {
721 				error = got_error_from_errno("strdup");
722 				goto err;
723 			}
724 		}
725 
726 		tag_commit = tag_commit0;
727 		while (*tag_commit == '\n')
728 			tag_commit++;
729 		new_repo_tag->tag_commit = strdup(tag_commit);
730 		if (new_repo_tag->tag_commit == NULL) {
731 			error = got_error_from_errno("strdup");
732 			free(tag_commit0);
733 			goto err;
734 		}
735 		free(tag_commit0);
736 
737 		if (qs->action != SUMMARY && qs->action != TAGS) {
738 			commit_msg = commit_msg0;
739 			while (*commit_msg == '\n')
740 				commit_msg++;
741 
742 			new_repo_tag->commit_msg = strdup(commit_msg);
743 			if (new_repo_tag->commit_msg == NULL) {
744 				error = got_error_from_errno("strdup");
745 				goto err;
746 			}
747 		}
748 
749 		if (limit && --limit == 0) {
750 			if (chk_multi == 0)
751 				break;
752 			chk_next = 1;
753 		}
754 	}
755 
756 done:
757 	/*
758 	 * we have tailq populated, so find previous commit id
759 	 * for navigation through briefs and commits
760 	 */
761 	if (t->tag_count == 0) {
762 		TAILQ_FOREACH_SAFE(rt, &t->repo_tags, entry, trt) {
763 			TAILQ_REMOVE(&t->repo_tags, rt, entry);
764 			gotweb_free_repo_tag(rt);
765 		}
766 	}
767 	if (t->tag_count > 0 && t->prev_id == NULL && qs->commit != NULL) {
768 		commit_found = 0;
769 		TAILQ_FOREACH_REVERSE(rt, &t->repo_tags, repo_tags_head,
770 		    entry) {
771 			if (commit_found == 0 && rt->commit_id != NULL &&
772 			    strcmp(qs->commit, rt->commit_id) != 0) {
773 				continue;
774 			} else
775 				commit_found = 1;
776 			if (c_cnt == srv->max_commits_display ||
777 			    rt == TAILQ_FIRST(&t->repo_tags)) {
778 				t->prev_id = strdup(rt->commit_id);
779 				if (t->prev_id == NULL)
780 					error = got_error_from_errno("strdup");
781 				break;
782 			}
783 			c_cnt++;
784 		}
785 	}
786 err:
787 	if (commit)
788 		got_object_commit_close(commit);
789 	if (tag)
790 		got_object_tag_close(tag);
791 	got_ref_list_free(&refs);
792 	free(commit_msg0);
793 	free(in_repo_path);
794 	free(repo_path);
795 	free(id);
796 	free(id_str);
797 	return error;
798 }
799 
800 const struct got_error *
801 got_output_repo_tree(struct request *c)
802 {
803 	const struct got_error *error = NULL;
804 	struct transport *t = c->t;
805 	struct got_commit_object *commit = NULL;
806 	struct got_repository *repo = t->repo;
807 	struct querystring *qs = t->qs;
808 	struct repo_commit *rc = NULL;
809 	struct got_object_id *tree_id = NULL, *commit_id = NULL;
810 	struct got_reflist_head refs;
811 	struct got_tree_object *tree = NULL;
812 	struct repo_dir *repo_dir = t->repo_dir;
813 	const char *name, *index_page_str, *folder;
814 	char *escaped_name = NULL, *path = NULL;
815 	int nentries, i, r;
816 
817 	TAILQ_INIT(&refs);
818 
819 	rc = TAILQ_FIRST(&t->repo_commits);
820 
821 	if (qs->folder != NULL) {
822 		path = strdup(qs->folder);
823 		if (path == NULL) {
824 			error = got_error_from_errno("strdup");
825 			goto done;
826 		}
827 	} else {
828 		error = got_repo_map_path(&path, repo, repo_dir->path);
829 		if (error)
830 			goto done;
831 	}
832 
833 	error = got_repo_match_object_id(&commit_id, NULL, rc->commit_id,
834 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
835 	if (error)
836 		goto done;
837 
838 	error = got_object_open_as_commit(&commit, repo, commit_id);
839 	if (error)
840 		goto done;
841 
842 	error = got_object_id_by_path(&tree_id, repo, commit, path);
843 	if (error)
844 		goto done;
845 
846 	error = got_object_open_as_tree(&tree, repo, tree_id);
847 	if (error)
848 		goto done;
849 
850 	nentries = got_object_tree_get_nentries(tree);
851 
852 	index_page_str = qs->index_page_str ? qs->index_page_str : "";
853 	folder = qs->folder ? qs->folder : "";
854 
855 	for (i = 0; i < nentries; i++) {
856 		const char *modestr;
857 		struct got_tree_entry *te;
858 		mode_t mode;
859 
860 		te = got_object_tree_get_entry(tree, i);
861 
862 		mode = got_tree_entry_get_mode(te);
863 		if (got_object_tree_entry_is_submodule(te))
864 			modestr = "$";
865 		else if (S_ISLNK(mode))
866 			modestr = "@";
867 		else if (S_ISDIR(mode))
868 			modestr = "/";
869 		else if (mode & S_IXUSR)
870 			modestr = "*";
871 		else
872 			modestr = "";
873 
874 		name = got_tree_entry_get_name(te);
875 		error = gotweb_escape_html(&escaped_name, name);
876 		if (error)
877 			goto done;
878 
879 		if (S_ISDIR(mode)) {
880 			r = fcgi_printf(c,
881 			    "<div class='tree_wrapper'>\n"
882 			    "<div class='tree_line'>"
883 			    "<a class='diff_directory' "
884 			    "href='?index_page=%s&path=%s&action=tree"
885 			    "&commit=%s&folder=%s/%s'>%s%s</a>"
886 			    "</div>\n" /* .tree_line */
887 			    "<div class='tree_line_blank'>&nbsp;</div>\n"
888 			    "</div>\n", /* .tree_wrapper */
889 			    index_page_str, qs->path, rc->commit_id,
890 			    folder, name, escaped_name, modestr);
891 			if (r == -1)
892 				goto done;
893 		} else {
894 			r = fcgi_printf(c,
895 			    "<div class='tree_wrapper'>\n"
896 			    "<div class='tree_line'>"
897 			    "<a href='?index_page=%s&path=%s&action=blob"
898 			    "&commit=%s&folder=%s&file=%s'>%s%s</a>"
899 			    "</div>\n" /* .tree_line */
900 			    "<div class='tree_line_blank'>"
901 			    "<a href='?index_page=%s&path=%s&action=commits"
902 			    "&commit=%s&folder=%s&file=%s'>commits</a>\n"
903 			    " | \n"
904 			    "<a href='?index_page=%s&path=%s&action=blame"
905 			    "&commit=%s&folder=%s&file=%s'>blame</a>\n"
906 			    "</div>\n"  /* .tree_line_blank */
907 			    "</div>\n", /* .tree_wrapper */
908 			    index_page_str, qs->path, rc->commit_id,
909 			    folder, name, escaped_name, modestr,
910 			    index_page_str, qs->path, rc->commit_id,
911 			    folder, name,
912 			    index_page_str, qs->path, rc->commit_id,
913 			    folder, name);
914 			if (r == -1)
915 				goto done;
916 		}
917 		free(escaped_name);
918 		escaped_name = NULL;
919 	}
920 done:
921 	free(escaped_name);
922 	free(path);
923 	got_ref_list_free(&refs);
924 	if (commit)
925 		got_object_commit_close(commit);
926 	if (tree)
927 		got_object_tree_close(tree);
928 	free(commit_id);
929 	free(tree_id);
930 	return error;
931 }
932 
933 const struct got_error *
934 got_output_file_blob(struct request *c)
935 {
936 	const struct got_error *error = NULL;
937 	struct transport *t = c->t;
938 	struct got_repository *repo = t->repo;
939 	struct querystring *qs = c->t->qs;
940 	struct got_commit_object *commit = NULL;
941 	struct got_object_id *commit_id = NULL;
942 	struct got_reflist_head refs;
943 	struct got_blob_object *blob = NULL;
944 	char *path = NULL, *in_repo_path = NULL;
945 	int obj_type, set_mime = 0, fd = -1;
946 	size_t len, hdrlen;
947 	const uint8_t *buf;
948 
949 	TAILQ_INIT(&refs);
950 
951 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
952 	    qs->folder ? "/" : "", qs->file) == -1) {
953 		error = got_error_from_errno("asprintf");
954 		goto done;
955 	}
956 
957 	error = got_repo_map_path(&in_repo_path, repo, path);
958 	if (error)
959 		goto done;
960 
961 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
962 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
963 	if (error)
964 		goto done;
965 
966 	error = got_object_open_as_commit(&commit, repo, commit_id);
967 	if (error)
968 		goto done;
969 
970 	error = got_object_id_by_path(&commit_id, repo, commit, in_repo_path);
971 	if (error)
972 		goto done;
973 
974 	if (commit_id == NULL) {
975 		error = got_error(GOT_ERR_NO_OBJ);
976 		goto done;
977 	}
978 
979 	error = got_object_get_type(&obj_type, repo, commit_id);
980 	if (error)
981 		goto done;
982 
983 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
984 		error = got_error(GOT_ERR_OBJ_TYPE);
985 		goto done;
986 	}
987 
988 	error = got_gotweb_dupfd(&c->priv_fd[BLOB_FD_1], &fd);
989 	if (error)
990 		goto done;
991 
992 	error = got_object_open_as_blob(&blob, repo, commit_id, BUF, fd);
993 	if (error)
994 		goto done;
995 	hdrlen = got_object_blob_get_hdrlen(blob);
996 	do {
997 		error = got_object_blob_read_block(&len, blob);
998 		if (error)
999 			goto done;
1000 		buf = got_object_blob_get_read_buf(blob);
1001 
1002 		/*
1003 		 * Skip blob object header first time around,
1004 		 * which also contains a zero byte.
1005 		 */
1006 		buf += hdrlen;
1007 		if (set_mime == 0) {
1008 			if (isbinary(buf, len - hdrlen)) {
1009 				error = gotweb_render_content_type_file(c,
1010 				    "application/octet-stream",
1011 				    qs->file);
1012 				if (error) {
1013 					log_warnx("%s: %s", __func__,
1014 					    error->msg);
1015 					goto done;
1016 				}
1017 			} else {
1018 				error = gotweb_render_content_type(c,
1019 				  "text/plain");
1020 				if (error) {
1021 					log_warnx("%s: %s", __func__,
1022 					    error->msg);
1023 					goto done;
1024 				}
1025 			}
1026 		}
1027 		set_mime = 1;
1028 		fcgi_gen_binary_response(c, buf, len - hdrlen);
1029 
1030 		hdrlen = 0;
1031 	} while (len != 0);
1032 done:
1033 	if (commit)
1034 		got_object_commit_close(commit);
1035 	if (fd != -1 && close(fd) == -1 && error == NULL)
1036 		error = got_error_from_errno("close");
1037 	if (blob)
1038 		got_object_blob_close(blob);
1039 	free(in_repo_path);
1040 	free(commit_id);
1041 	free(path);
1042 	return error;
1043 }
1044 
1045 struct blame_line {
1046 	int annotated;
1047 	char *id_str;
1048 	char *committer;
1049 	char datebuf[11]; /* YYYY-MM-DD + NUL */
1050 };
1051 
1052 struct blame_cb_args {
1053 	struct blame_line *lines;
1054 	int nlines;
1055 	int nlines_prec;
1056 	int lineno_cur;
1057 	off_t *line_offsets;
1058 	FILE *f;
1059 	struct got_repository *repo;
1060 	struct request *c;
1061 };
1062 
1063 static const struct got_error *
1064 got_gotweb_blame_cb(void *arg, int nlines, int lineno,
1065     struct got_commit_object *commit, struct got_object_id *id)
1066 {
1067 	const struct got_error *err = NULL;
1068 	struct blame_cb_args *a = arg;
1069 	struct blame_line *bline;
1070 	struct request *c = a->c;
1071 	struct transport *t = c->t;
1072 	struct querystring *qs = t->qs;
1073 	struct repo_dir *repo_dir = t->repo_dir;
1074 	const char *index_page_str;
1075 	char *line = NULL, *eline = NULL;
1076 	size_t linesize = 0;
1077 	off_t offset;
1078 	struct tm tm;
1079 	time_t committer_time;
1080 	int r;
1081 
1082 	if (nlines != a->nlines ||
1083 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
1084 		return got_error(GOT_ERR_RANGE);
1085 
1086 	if (lineno == -1)
1087 		return NULL; /* no change in this commit */
1088 
1089 	/* Annotate this line. */
1090 	bline = &a->lines[lineno - 1];
1091 	if (bline->annotated)
1092 		return NULL;
1093 	err = got_object_id_str(&bline->id_str, id);
1094 	if (err)
1095 		return err;
1096 
1097 	bline->committer = strdup(got_object_commit_get_committer(commit));
1098 	if (bline->committer == NULL) {
1099 		err = got_error_from_errno("strdup");
1100 		goto done;
1101 	}
1102 
1103 	committer_time = got_object_commit_get_committer_time(commit);
1104 	if (gmtime_r(&committer_time, &tm) == NULL)
1105 		return got_error_from_errno("gmtime_r");
1106 	if (strftime(bline->datebuf, sizeof(bline->datebuf), "%G-%m-%d",
1107 	    &tm) == 0) {
1108 		err = got_error(GOT_ERR_NO_SPACE);
1109 		goto done;
1110 	}
1111 	bline->annotated = 1;
1112 
1113 	/* Print lines annotated so far. */
1114 	bline = &a->lines[a->lineno_cur - 1];
1115 	if (!bline->annotated)
1116 		goto done;
1117 
1118 	offset = a->line_offsets[a->lineno_cur - 1];
1119 	if (fseeko(a->f, offset, SEEK_SET) == -1) {
1120 		err = got_error_from_errno("fseeko");
1121 		goto done;
1122 	}
1123 
1124 	index_page_str = qs->index_page_str ? qs->index_page_str : "";
1125 
1126 	while (a->lineno_cur <= a->nlines && bline->annotated) {
1127 		char *smallerthan, *at, *nl, *committer;
1128 		size_t len;
1129 
1130 		if (getline(&line, &linesize, a->f) == -1) {
1131 			if (ferror(a->f))
1132 				err = got_error_from_errno("getline");
1133 			break;
1134 		}
1135 
1136 		committer = bline->committer;
1137 		smallerthan = strchr(committer, '<');
1138 		if (smallerthan && smallerthan[1] != '\0')
1139 			committer = smallerthan + 1;
1140 		at = strchr(committer, '@');
1141 		if (at)
1142 			*at = '\0';
1143 		len = strlen(committer);
1144 		if (len >= 9)
1145 			committer[8] = '\0';
1146 
1147 		nl = strchr(line, '\n');
1148 		if (nl)
1149 			*nl = '\0';
1150 
1151 		err = gotweb_escape_html(&eline, line);
1152 		if (err)
1153 			goto done;
1154 
1155 		r = fcgi_printf(c, "<div class='blame_wrapper'>"
1156 		    "<div class='blame_number'>%.*d</div>"
1157 		    "<div class='blame_hash'>"
1158 		    "<a href='?index_page=%s&path=%s&action=diff&commit=%s'>"
1159 		    "%.8s</a>"
1160 		    "</div>"
1161 		    "<div class='blame_date'>%s</div>"
1162 		    "<div class='blame_author'>%s</div>"
1163 		    "<div class='blame_code'>%s</div>"
1164 		    "</div>",	/* .blame_wrapper */
1165 		    a->nlines_prec, a->lineno_cur,
1166 		    index_page_str, repo_dir->name, bline->id_str,
1167 		    bline->id_str,
1168 		    bline->datebuf,
1169 		    committer,
1170 		    eline);
1171 		if (r == -1)
1172 			goto done;
1173 
1174 		a->lineno_cur++;
1175 		bline = &a->lines[a->lineno_cur - 1];
1176 
1177 		free(eline);
1178 		eline = NULL;
1179 	}
1180 done:
1181 	free(line);
1182 	free(eline);
1183 	return err;
1184 }
1185 
1186 const struct got_error *
1187 got_output_file_blame(struct request *c)
1188 {
1189 	const struct got_error *error = NULL;
1190 	struct transport *t = c->t;
1191 	struct got_repository *repo = t->repo;
1192 	struct querystring *qs = c->t->qs;
1193 	struct got_object_id *obj_id = NULL, *commit_id = NULL;
1194 	struct got_commit_object *commit = NULL;
1195 	struct got_reflist_head refs;
1196 	struct got_blob_object *blob = NULL;
1197 	char *path = NULL, *in_repo_path = NULL;
1198 	struct blame_cb_args bca;
1199 	int i, obj_type, fd1 = -1, fd2 = -1, fd3 = -1, fd4 = -1, fd5 = -1;
1200 	int fd6 = -1;
1201 	off_t filesize;
1202 	FILE *f1 = NULL, *f2 = NULL;
1203 
1204 	TAILQ_INIT(&refs);
1205 	bca.f = NULL;
1206 	bca.lines = NULL;
1207 
1208 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1209 	    qs->folder ? "/" : "", qs->file) == -1) {
1210 		error = got_error_from_errno("asprintf");
1211 		goto done;
1212 	}
1213 
1214 	error = got_repo_map_path(&in_repo_path, repo, path);
1215 	if (error)
1216 		goto done;
1217 
1218 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1219 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1220 	if (error)
1221 		goto done;
1222 
1223 	error = got_object_open_as_commit(&commit, repo, commit_id);
1224 	if (error)
1225 		goto done;
1226 
1227 	error = got_object_id_by_path(&obj_id, repo, commit, in_repo_path);
1228 	if (error)
1229 		goto done;
1230 
1231 	error = got_object_get_type(&obj_type, repo, obj_id);
1232 	if (error)
1233 		goto done;
1234 
1235 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1236 		error = got_error(GOT_ERR_OBJ_TYPE);
1237 		goto done;
1238 	}
1239 
1240 	error = got_gotweb_openfile(&bca.f, &c->priv_fd[BLAME_FD_1], &fd1);
1241 	if (error)
1242 		goto done;
1243 
1244 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_2], &fd2);
1245 	if (error)
1246 		goto done;
1247 
1248 	error = got_object_open_as_blob(&blob, repo, obj_id, BUF, fd2);
1249 	if (error)
1250 		goto done;
1251 
1252 	error = got_object_blob_dump_to_file(&filesize, &bca.nlines,
1253 	    &bca.line_offsets, bca.f, blob);
1254 	if (error || bca.nlines == 0)
1255 		goto done;
1256 
1257 	/* Don't include \n at EOF in the blame line count. */
1258 	if (bca.line_offsets[bca.nlines - 1] == filesize)
1259 		bca.nlines--;
1260 
1261 	bca.lines = calloc(bca.nlines, sizeof(*bca.lines));
1262 	if (bca.lines == NULL) {
1263 		error = got_error_from_errno("calloc");
1264 		goto done;
1265 	}
1266 	bca.lineno_cur = 1;
1267 	bca.nlines_prec = 0;
1268 	i = bca.nlines;
1269 	while (i > 0) {
1270 		i /= 10;
1271 		bca.nlines_prec++;
1272 	}
1273 	bca.repo = repo;
1274 	bca.c = c;
1275 
1276 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_3], &fd3);
1277 	if (error)
1278 		goto done;
1279 
1280 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_4], &fd4);
1281 	if (error)
1282 		goto done;
1283 
1284 	error = got_gotweb_openfile(&f1, &c->priv_fd[BLAME_FD_5], &fd5);
1285 	if (error)
1286 		goto done;
1287 
1288 	error = got_gotweb_openfile(&f2, &c->priv_fd[BLAME_FD_6], &fd6);
1289 	if (error)
1290 		goto done;
1291 
1292 	error = got_blame(in_repo_path, commit_id, repo,
1293 	    GOT_DIFF_ALGORITHM_MYERS, got_gotweb_blame_cb, &bca, NULL, NULL,
1294 	    fd3, fd4, f1, f2);
1295 
1296 done:
1297 	if (bca.lines) {
1298 		free(bca.line_offsets);
1299 		for (i = 0; i < bca.nlines; i++) {
1300 			struct blame_line *bline = &bca.lines[i];
1301 			free(bline->id_str);
1302 			free(bline->committer);
1303 		}
1304 	}
1305 	free(bca.lines);
1306 	if (fd2 != -1 && close(fd2) == -1 && error == NULL)
1307 		error = got_error_from_errno("close");
1308 	if (fd3 != -1 && close(fd3) == -1 && error == NULL)
1309 		error = got_error_from_errno("close");
1310 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1311 		error = got_error_from_errno("close");
1312 	if (bca.f) {
1313 		const struct got_error *bca_err =
1314 		    got_gotweb_flushfile(bca.f, fd1);
1315 		if (error == NULL)
1316 			error = bca_err;
1317 	}
1318 	if (f1) {
1319 		const struct got_error *f1_err =
1320 		    got_gotweb_flushfile(f1, fd5);
1321 		if (error == NULL)
1322 			error = f1_err;
1323 	}
1324 	if (f2) {
1325 		const struct got_error *f2_err =
1326 		    got_gotweb_flushfile(f2, fd6);
1327 		if (error == NULL)
1328 			error = f2_err;
1329 	}
1330 	if (commit)
1331 		got_object_commit_close(commit);
1332 	if (blob)
1333 		got_object_blob_close(blob);
1334 	free(in_repo_path);
1335 	free(commit_id);
1336 	free(obj_id);
1337 	free(path);
1338 	got_ref_list_free(&refs);
1339 	return error;
1340 }
1341 
1342 const struct got_error *
1343 got_output_repo_diff(struct request *c)
1344 {
1345 	const struct got_error *error = NULL;
1346 	struct transport *t = c->t;
1347 	struct got_repository *repo = t->repo;
1348 	struct repo_commit *rc = NULL;
1349 	struct got_object_id *id1 = NULL, *id2 = NULL;
1350 	struct got_reflist_head refs;
1351 	FILE *f1 = NULL, *f2 = NULL, *f3 = NULL;
1352 	char *label1 = NULL, *label2 = NULL, *line = NULL;
1353 	char *newline, *eline = NULL, *color = NULL;
1354 	int obj_type, fd1, fd2, fd3, fd4 = -1, fd5 = -1;
1355 	size_t linesize = 0;
1356 	ssize_t linelen;
1357 	int wrlen = 0;
1358 
1359 	TAILQ_INIT(&refs);
1360 
1361 	error = got_gotweb_openfile(&f1, &c->priv_fd[DIFF_FD_1], &fd1);
1362 	if (error)
1363 		return error;
1364 
1365 	error = got_gotweb_openfile(&f2, &c->priv_fd[DIFF_FD_2], &fd2);
1366 	if (error)
1367 		return error;
1368 
1369 	error = got_gotweb_openfile(&f3, &c->priv_fd[DIFF_FD_3], &fd3);
1370 	if (error)
1371 		return error;
1372 
1373 	rc = TAILQ_FIRST(&t->repo_commits);
1374 
1375 	if (rc->parent_id != NULL &&
1376 	    strncmp(rc->parent_id, "/dev/null", 9) != 0) {
1377 		error = got_repo_match_object_id(&id1, &label1,
1378 		    rc->parent_id, GOT_OBJ_TYPE_ANY,
1379 		    &refs, repo);
1380 		if (error)
1381 			goto done;
1382 	}
1383 
1384 	error = got_repo_match_object_id(&id2, &label2, rc->commit_id,
1385 	    GOT_OBJ_TYPE_ANY, &refs, repo);
1386 	if (error)
1387 		goto done;
1388 
1389 	error = got_object_get_type(&obj_type, repo, id2);
1390 	if (error)
1391 		goto done;
1392 
1393 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_4], &fd4);
1394 	if (error)
1395 		goto done;
1396 
1397 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_5], &fd5);
1398 	if (error)
1399 		goto done;
1400 
1401 	switch (obj_type) {
1402 	case GOT_OBJ_TYPE_BLOB:
1403 		error = got_diff_objects_as_blobs(NULL, NULL, f1, f2, fd4, fd5,
1404 		     id1, id2, NULL, NULL, GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1405 		     repo, f3);
1406 		break;
1407 	case GOT_OBJ_TYPE_TREE:
1408 		error = got_diff_objects_as_trees(NULL, NULL, f1, f2, fd4, fd5,
1409 		    id1, id2, NULL, "", "",  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1410 		    repo, f3);
1411 		break;
1412 	case GOT_OBJ_TYPE_COMMIT:
1413 		error = got_diff_objects_as_commits(NULL, NULL, f1, f2, fd4,
1414 		    fd5, id1, id2, NULL,  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1415 		    repo, f3);
1416 		break;
1417 	default:
1418 		error = got_error(GOT_ERR_OBJ_TYPE);
1419 	}
1420 	if (error)
1421 		goto done;
1422 
1423 	if (fseek(f1, 0, SEEK_SET) == -1) {
1424 		error = got_ferror(f1, GOT_ERR_IO);
1425 		goto done;
1426 	}
1427 
1428 	if (fseek(f2, 0, SEEK_SET) == -1) {
1429 		error = got_ferror(f2, GOT_ERR_IO);
1430 		goto done;
1431 	}
1432 
1433 	if (fseek(f3, 0, SEEK_SET) == -1) {
1434 		error = got_ferror(f3, GOT_ERR_IO);
1435 		goto done;
1436 	}
1437 
1438 	while ((linelen = getline(&line, &linesize, f3)) != -1) {
1439 		if (strncmp(line, "-", 1) == 0) {
1440 			color = strdup("diff_minus");
1441 			if (color == NULL) {
1442 				error = got_error_from_errno("strdup");
1443 				goto done;
1444 			}
1445 		} else if (strncmp(line, "+", 1) == 0) {
1446 			color = strdup("diff_plus");
1447 			if (color == NULL) {
1448 				error = got_error_from_errno("strdup");
1449 				goto done;
1450 			}
1451 		} else if (strncmp(line, "@@", 2) == 0) {
1452 			color = strdup("diff_chunk_header");
1453 			if (color == NULL) {
1454 				error = got_error_from_errno("strdup");
1455 				goto done;
1456 			}
1457 		} else if (strncmp(line, "@@", 2) == 0) {
1458 			color = strdup("diff_chunk_header");
1459 			if (color == NULL) {
1460 				error = got_error_from_errno("strdup");
1461 				goto done;
1462 			}
1463 		} else if (strncmp(line, "commit +", 8) == 0) {
1464 			color = strdup("diff_meta");
1465 			if (color == NULL) {
1466 				error = got_error_from_errno("strdup");
1467 				goto done;
1468 			}
1469 		} else if (strncmp(line, "commit -", 8) == 0) {
1470 			color = strdup("diff_meta");
1471 			if (color == NULL) {
1472 				error = got_error_from_errno("strdup");
1473 				goto done;
1474 			}
1475 		} else if (strncmp(line, "blob +", 6) == 0) {
1476 			color = strdup("diff_meta");
1477 			if (color == NULL) {
1478 				error = got_error_from_errno("strdup");
1479 				goto done;
1480 			}
1481 		} else if (strncmp(line, "blob -", 6) == 0) {
1482 			color = strdup("diff_meta");
1483 			if (color == NULL) {
1484 				error = got_error_from_errno("strdup");
1485 				goto done;
1486 			}
1487 		} else if (strncmp(line, "file +", 6) == 0) {
1488 			color = strdup("diff_meta");
1489 			if (color == NULL) {
1490 				error = got_error_from_errno("strdup");
1491 				goto done;
1492 			}
1493 		} else if (strncmp(line, "file -", 6) == 0) {
1494 			color = strdup("diff_meta");
1495 			if (color == NULL) {
1496 				error = got_error_from_errno("strdup");
1497 				goto done;
1498 			}
1499 		} else if (strncmp(line, "from:", 5) == 0) {
1500 			color = strdup("diff_author");
1501 			if (color == NULL) {
1502 				error = got_error_from_errno("strdup");
1503 				goto done;
1504 			}
1505 		} else if (strncmp(line, "via:", 4) == 0) {
1506 			color = strdup("diff_author");
1507 			if (color == NULL) {
1508 				error = got_error_from_errno("strdup");
1509 				goto done;
1510 			}
1511 		} else if (strncmp(line, "date:", 5) == 0) {
1512 			color = strdup("diff_date");
1513 			if (color == NULL) {
1514 				error = got_error_from_errno("strdup");
1515 				goto done;
1516 			}
1517 		}
1518 
1519 		newline = strchr(line, '\n');
1520 		if (newline)
1521 			*newline = '\0';
1522 
1523 		error = gotweb_escape_html(&eline, line);
1524 		if (error)
1525 			goto done;
1526 
1527 		fcgi_printf(c, "<div class='diff_line %s'>%s</div>\n",
1528 		    color ? color : "", eline);
1529 		free(eline);
1530 		eline = NULL;
1531 
1532 		if (linelen > 0)
1533 			wrlen = wrlen + linelen;
1534 		free(color);
1535 		color = NULL;
1536 	}
1537 	if (linelen == -1 && ferror(f3))
1538 		error = got_error_from_errno("getline");
1539 done:
1540 	free(color);
1541 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1542 		error = got_error_from_errno("close");
1543 	if (fd5 != -1 && close(fd5) == -1 && error == NULL)
1544 		error = got_error_from_errno("close");
1545 	if (f1) {
1546 		const struct got_error *f1_err =
1547 		    got_gotweb_flushfile(f1, fd1);
1548 		if (error == NULL)
1549 			error = f1_err;
1550 	}
1551 	if (f2) {
1552 		const struct got_error *f2_err =
1553 		    got_gotweb_flushfile(f2, fd2);
1554 		if (error == NULL)
1555 			error = f2_err;
1556 	}
1557 	if (f3) {
1558 		const struct got_error *f3_err =
1559 		    got_gotweb_flushfile(f3, fd3);
1560 		if (error == NULL)
1561 			error = f3_err;
1562 	}
1563 	got_ref_list_free(&refs);
1564 	free(line);
1565 	free(eline);
1566 	free(label1);
1567 	free(label2);
1568 	free(id1);
1569 	free(id2);
1570 	return error;
1571 }
1572 
1573 static const struct got_error *
1574 got_init_repo_commit(struct repo_commit **rc)
1575 {
1576 	*rc = calloc(1, sizeof(**rc));
1577 	if (*rc == NULL)
1578 		return got_error_from_errno2("%s: calloc", __func__);
1579 
1580 	(*rc)->path = NULL;
1581 	(*rc)->refs_str = NULL;
1582 	(*rc)->commit_id = NULL;
1583 	(*rc)->committer = NULL;
1584 	(*rc)->author = NULL;
1585 	(*rc)->parent_id = NULL;
1586 	(*rc)->tree_id = NULL;
1587 	(*rc)->commit_msg = NULL;
1588 
1589 	return NULL;
1590 }
1591 
1592 static const struct got_error *
1593 got_init_repo_tag(struct repo_tag **rt)
1594 {
1595 	*rt = calloc(1, sizeof(**rt));
1596 	if (*rt == NULL)
1597 		return got_error_from_errno2("%s: calloc", __func__);
1598 
1599 	(*rt)->commit_id = NULL;
1600 	(*rt)->tag_name = NULL;
1601 	(*rt)->tag_commit = NULL;
1602 	(*rt)->commit_msg = NULL;
1603 	(*rt)->tagger = NULL;
1604 
1605 	return NULL;
1606 }