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 	error = got_init_repo_commit(&repo_commit);
359 	if (error)
360 		goto done;
361 
362 	/*
363 	 * XXX: jumping directly to a commit id via
364 	 * got_repo_match_object_id_prefix significantly improves performance,
365 	 * but does not allow us to create a PREVIOUS button, since commits can
366 	 * only be itereated forward. So, we have to match as we iterate from
367 	 * the headref.
368 	 */
369 	if (qs->action == BRIEFS || qs->action == COMMITS ||
370 	    (qs->action == TREE && qs->commit == NULL)) {
371 		error = got_ref_open(&ref, repo, qs->headref, 0);
372 		if (error)
373 			goto done;
374 
375 		error = got_ref_resolve(&id, repo, ref);
376 		if (error)
377 			goto done;
378 	} else if (qs->commit != NULL) {
379 		error = got_ref_open(&ref, repo, qs->commit, 0);
380 		if (error == NULL) {
381 			error = got_ref_resolve(&id, repo, ref);
382 			if (error)
383 				goto done;
384 			error = got_object_get_type(&obj_type, repo, id);
385 			if (error)
386 				goto done;
387 			if (obj_type == GOT_OBJ_TYPE_TAG) {
388 				struct got_tag_object *tag;
389 				error = got_object_open_as_tag(&tag, repo, id);
390 				if (error)
391 					goto done;
392 				if (got_object_tag_get_object_type(tag) !=
393 				    GOT_OBJ_TYPE_COMMIT) {
394 					got_object_tag_close(tag);
395 					error = got_error(GOT_ERR_OBJ_TYPE);
396 					goto done;
397 				}
398 				free(id);
399 				id = got_object_id_dup(
400 				    got_object_tag_get_object_id(tag));
401 				if (id == NULL)
402 					error = got_error_from_errno(
403 					    "got_object_id_dup");
404 				got_object_tag_close(tag);
405 				if (error)
406 					goto done;
407 			} else if (obj_type != GOT_OBJ_TYPE_COMMIT) {
408 				error = got_error(GOT_ERR_OBJ_TYPE);
409 				goto done;
410 			}
411 		}
412 		error = got_repo_match_object_id_prefix(&id, qs->commit,
413 		    GOT_OBJ_TYPE_COMMIT, repo);
414 		if (error)
415 			goto done;
416 	}
417 
418 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
419 	if (error)
420 		goto done;
421 
422 	error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name, NULL);
423 	if (error)
424 		goto done;
425 
426 	if (qs->file != NULL && strlen(qs->file) > 0) {
427 		error = got_commit_graph_open(&graph, file_path, 0);
428 		if (error)
429 			goto done;
430 	} else {
431 		error = got_commit_graph_open(&graph, in_repo_path, 0);
432 		if (error)
433 			goto done;
434 	}
435 
436 	error = got_commit_graph_iter_start(graph, id, repo, NULL, NULL);
437 	if (error)
438 		goto done;
439 
440 	for (;;) {
441 		if (limit_chk == ((limit * qs->page) - (limit - 1)) &&
442 		    commit_found == 0 && repo_commit->commit_id != NULL) {
443 			t->prev_id = strdup(repo_commit->commit_id);
444 			if (t->prev_id == NULL) {
445 				error = got_error_from_errno("strdup");
446 				goto done;
447 			}
448 		}
449 
450 		error = got_commit_graph_iter_next(&id, graph, repo, NULL,
451 		    NULL);
452 		if (error) {
453 			if (error->code == GOT_ERR_ITER_COMPLETED)
454 				error = NULL;
455 			goto done;
456 		}
457 		if (id == NULL)
458 			goto done;
459 
460 		error = got_object_open_as_commit(&commit, repo, id);
461 		if (error)
462 			goto done;
463 
464 		error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name,
465 		    NULL);
466 		if (error)
467 			goto done;
468 
469 		error = got_get_repo_commit(c, repo_commit, commit,
470 		    &refs, id);
471 		if (error)
472 			goto done;
473 
474 		if (qs->commit != NULL && commit_found == 0 && limit != 1) {
475 			if (strcmp(qs->commit, repo_commit->commit_id) == 0)
476 				commit_found = 1;
477 			else if (qs->file != NULL && strlen(qs->file) > 0 &&
478 			    qs->page == 0)
479 				commit_found = 1;
480 			else {
481 				limit_chk++;
482 				free(id);
483 				id = NULL;
484 				continue;
485 			}
486 		}
487 
488 		struct repo_commit *new_repo_commit = NULL;
489 		error = got_init_repo_commit(&new_repo_commit);
490 		if (error)
491 			goto done;
492 
493 		TAILQ_INSERT_TAIL(&t->repo_commits, new_repo_commit, entry);
494 
495 		error = got_get_repo_commit(c, new_repo_commit, commit,
496 		    &refs, id);
497 		if (error)
498 			goto done;
499 
500 		free(id);
501 		id = NULL;
502 
503 		if (limit == 1 && chk_multi == 0 &&
504 		    srv->max_commits_display != 1)
505 			commit_found = 1;
506 		else {
507 			chk_multi = 1;
508 
509 			/*
510 			 * check for one more commit before breaking,
511 			 * so we know whether to navigate through briefs
512 			 * commits and summary
513 			 */
514 			if (chk_next && (qs->action == BRIEFS ||
515 			    qs->action == COMMITS || qs->action == SUMMARY)) {
516 				t->next_id = strdup(new_repo_commit->commit_id);
517 				if (t->next_id == NULL) {
518 					error = got_error_from_errno("strdup");
519 					goto done;
520 				}
521 				if (commit) {
522 					got_object_commit_close(commit);
523 					commit = NULL;
524 				}
525 				TAILQ_REMOVE(&t->repo_commits, new_repo_commit,
526 				    entry);
527 				gotweb_free_repo_commit(new_repo_commit);
528 				goto done;
529 			}
530 		}
531 		got_ref_list_free(&refs);
532 		if (error || (limit && --limit == 0)) {
533 			if (commit_found || (qs->file != NULL &&
534 			    strlen(qs->file) > 0))
535 				if (chk_multi == 0)
536 					break;
537 			chk_next = 1;
538 		}
539 		if (commit) {
540 			got_object_commit_close(commit);
541 			commit = NULL;
542 		}
543 	}
544 done:
545 	gotweb_free_repo_commit(repo_commit);
546 	if (ref)
547 		got_ref_close(ref);
548 	if (commit)
549 		got_object_commit_close(commit);
550 	if (graph)
551 		got_commit_graph_close(graph);
552 	got_ref_list_free(&refs);
553 	free(in_repo_path);
554 	free(file_path);
555 	free(repo_path);
556 	free(id);
557 	return error;
558 }
559 
560 const struct got_error *
561 got_get_repo_tags(struct request *c, int limit)
562 {
563 	const struct got_error *error = NULL;
564 	struct got_object_id *id = NULL;
565 	struct got_commit_object *commit = NULL;
566 	struct got_reflist_head refs;
567 	struct got_reference *ref;
568 	struct got_reflist_entry *re;
569 	struct server *srv = c->srv;
570 	struct transport *t = c->t;
571 	struct got_repository *repo = t->repo;
572 	struct querystring *qs = t->qs;
573 	struct repo_dir *repo_dir = t->repo_dir;
574 	struct got_tag_object *tag = NULL;
575 	struct repo_tag *rt = NULL, *trt = NULL;
576 	char *in_repo_path = NULL, *repo_path = NULL, *id_str = NULL;
577 	char *tag_commit = NULL, *tag_commit0 = NULL;
578 	char *commit_msg = NULL, *commit_msg0 = NULL;
579 	int chk_next = 0, chk_multi = 1, commit_found = 0, c_cnt = 0;
580 
581 	TAILQ_INIT(&refs);
582 
583 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
584 	    repo_dir->name) == -1)
585 		return got_error_from_errno("asprintf");
586 
587 	if (qs->commit == NULL && qs->action == TAGS) {
588 		error = got_ref_open(&ref, repo, qs->headref, 0);
589 		if (error)
590 			goto err;
591 		error = got_ref_resolve(&id, repo, ref);
592 		got_ref_close(ref);
593 		if (error)
594 			goto err;
595 	} else if (qs->commit == NULL && qs->action == TAG) {
596 		error = got_error_msg(GOT_ERR_EOF, "commit id missing");
597 		goto err;
598 	} else {
599 		error = got_repo_match_object_id_prefix(&id, qs->commit,
600 		    GOT_OBJ_TYPE_COMMIT, repo);
601 		if (error)
602 			goto err;
603 	}
604 
605 	if (qs->action != SUMMARY && qs->action != TAGS) {
606 		error = got_object_open_as_commit(&commit, repo, id);
607 		if (error)
608 			goto err;
609 		error = got_object_commit_get_logmsg(&commit_msg0, commit);
610 		if (error)
611 			goto err;
612 		if (commit) {
613 			got_object_commit_close(commit);
614 			commit = NULL;
615 		}
616 	}
617 
618 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
619 	if (error)
620 		goto err;
621 
622 	error = got_ref_list(&refs, repo, "refs/tags", got_ref_cmp_tags,
623 	   repo);
624 	if (error)
625 		goto err;
626 
627 	if (limit == 1)
628 		chk_multi = 0;
629 
630 	/*
631 	 * XXX: again, see previous message about caching
632 	 */
633 
634 	TAILQ_FOREACH(re, &refs, entry) {
635 		struct repo_tag *new_repo_tag = NULL;
636 		error = got_init_repo_tag(&new_repo_tag);
637 		if (error)
638 			goto err;
639 
640 		TAILQ_INSERT_TAIL(&t->repo_tags, new_repo_tag, entry);
641 
642 		new_repo_tag->tag_name = strdup(got_ref_get_name(re->ref));
643 		if (new_repo_tag->tag_name == NULL) {
644 			error = got_error_from_errno("strdup");
645 			goto err;
646 		}
647 
648 		free(id);
649 		id = NULL;
650 
651 		free(id_str);
652 		id_str = NULL;
653 
654 		error = got_ref_resolve(&id, repo, re->ref);
655 		if (error)
656 			goto done;
657 
658 		if (tag)
659 			got_object_tag_close(tag);
660 		error = got_object_open_as_tag(&tag, repo, id);
661 		if (error) {
662 			if (error->code != GOT_ERR_OBJ_TYPE)
663 				goto done;
664 			/* "lightweight" tag */
665 			error = got_object_open_as_commit(&commit, repo, id);
666 			if (error)
667 				goto done;
668 			new_repo_tag->tagger =
669 			    strdup(got_object_commit_get_committer(commit));
670 			if (new_repo_tag->tagger == NULL) {
671 				error = got_error_from_errno("strdup");
672 				goto err;
673 			}
674 			new_repo_tag->tagger_time =
675 			    got_object_commit_get_committer_time(commit);
676 			error = got_object_id_str(&id_str, id);
677 			if (error)
678 				goto err;
679 		} else {
680 			new_repo_tag->tagger =
681 			    strdup(got_object_tag_get_tagger(tag));
682 			if (new_repo_tag->tagger == NULL) {
683 				error = got_error_from_errno("strdup");
684 				goto err;
685 			}
686 			new_repo_tag->tagger_time =
687 			    got_object_tag_get_tagger_time(tag);
688 			error = got_object_id_str(&id_str,
689 			    got_object_tag_get_object_id(tag));
690 			if (error)
691 				goto err;
692 		}
693 
694 		new_repo_tag->commit_id = strdup(id_str);
695 		if (new_repo_tag->commit_id == NULL)
696 			goto err;
697 
698 		if (commit_found == 0 && qs->commit != NULL &&
699 		    strncmp(id_str, qs->commit, strlen(id_str)) != 0)
700 			continue;
701 		else
702 			commit_found = 1;
703 
704 		t->tag_count++;
705 
706 		/*
707 		 * check for one more commit before breaking,
708 		 * so we know whether to navigate through briefs
709 		 * commits and summary
710 		 */
711 		if (chk_next) {
712 			t->next_id = strdup(new_repo_tag->commit_id);
713 			if (t->next_id == NULL) {
714 				error = got_error_from_errno("strdup");
715 				goto err;
716 			}
717 			if (commit) {
718 				got_object_commit_close(commit);
719 				commit = NULL;
720 			}
721 			TAILQ_REMOVE(&t->repo_tags, new_repo_tag, entry);
722 			gotweb_free_repo_tag(new_repo_tag);
723 			goto done;
724 		}
725 
726 		if (commit) {
727 			error = got_object_commit_get_logmsg(&tag_commit0,
728 			    commit);
729 			if (error)
730 				goto err;
731 			got_object_commit_close(commit);
732 			commit = NULL;
733 		} else {
734 			tag_commit0 = strdup(got_object_tag_get_message(tag));
735 			if (tag_commit0 == NULL) {
736 				error = got_error_from_errno("strdup");
737 				goto err;
738 			}
739 		}
740 
741 		tag_commit = tag_commit0;
742 		while (*tag_commit == '\n')
743 			tag_commit++;
744 		new_repo_tag->tag_commit = strdup(tag_commit);
745 		if (new_repo_tag->tag_commit == NULL) {
746 			error = got_error_from_errno("strdup");
747 			free(tag_commit0);
748 			goto err;
749 		}
750 		free(tag_commit0);
751 
752 		if (qs->action != SUMMARY && qs->action != TAGS) {
753 			commit_msg = commit_msg0;
754 			while (*commit_msg == '\n')
755 				commit_msg++;
756 
757 			new_repo_tag->commit_msg = strdup(commit_msg);
758 			if (new_repo_tag->commit_msg == NULL) {
759 				error = got_error_from_errno("strdup");
760 				goto err;
761 			}
762 		}
763 
764 		if (limit && --limit == 0) {
765 			if (chk_multi == 0)
766 				break;
767 			chk_next = 1;
768 		}
769 	}
770 
771 done:
772 	/*
773 	 * we have tailq populated, so find previous commit id
774 	 * for navigation through briefs and commits
775 	 */
776 	if (t->tag_count == 0) {
777 		TAILQ_FOREACH_SAFE(rt, &t->repo_tags, entry, trt) {
778 			TAILQ_REMOVE(&t->repo_tags, rt, entry);
779 			gotweb_free_repo_tag(rt);
780 		}
781 	}
782 	if (t->tag_count > 0 && t->prev_id == NULL && qs->commit != NULL) {
783 		commit_found = 0;
784 		TAILQ_FOREACH_REVERSE(rt, &t->repo_tags, repo_tags_head,
785 		    entry) {
786 			if (commit_found == 0 && rt->commit_id != NULL &&
787 			    strcmp(qs->commit, rt->commit_id) != 0) {
788 				continue;
789 			} else
790 				commit_found = 1;
791 			if (c_cnt == srv->max_commits_display ||
792 			    rt == TAILQ_FIRST(&t->repo_tags)) {
793 				t->prev_id = strdup(rt->commit_id);
794 				if (t->prev_id == NULL)
795 					error = got_error_from_errno("strdup");
796 				break;
797 			}
798 			c_cnt++;
799 		}
800 	}
801 err:
802 	if (commit)
803 		got_object_commit_close(commit);
804 	if (tag)
805 		got_object_tag_close(tag);
806 	got_ref_list_free(&refs);
807 	free(commit_msg0);
808 	free(in_repo_path);
809 	free(repo_path);
810 	free(id);
811 	free(id_str);
812 	return error;
813 }
814 
815 const struct got_error *
816 got_output_repo_tree(struct request *c)
817 {
818 	const struct got_error *error = NULL;
819 	struct transport *t = c->t;
820 	struct got_commit_object *commit = NULL;
821 	struct got_repository *repo = t->repo;
822 	struct querystring *qs = t->qs;
823 	struct repo_commit *rc = NULL;
824 	struct got_object_id *tree_id = NULL, *commit_id = NULL;
825 	struct got_reflist_head refs;
826 	struct got_tree_object *tree = NULL;
827 	struct repo_dir *repo_dir = t->repo_dir;
828 	const char *name, *index_page_str, *folder;
829 	char *id_str = NULL, *escaped_name = NULL;
830 	char *path = NULL, *in_repo_path = NULL, *modestr = NULL;
831 	int nentries, i, r;
832 
833 	TAILQ_INIT(&refs);
834 
835 	rc = TAILQ_FIRST(&t->repo_commits);
836 
837 	if (qs->folder != NULL) {
838 		path = strdup(qs->folder);
839 		if (path == NULL) {
840 			error = got_error_from_errno("strdup");
841 			goto done;
842 		}
843 	} else {
844 		error = got_repo_map_path(&in_repo_path, repo, repo_dir->path);
845 		if (error)
846 			goto done;
847 		free(path);
848 		path = in_repo_path;
849 	}
850 
851 	error = got_repo_match_object_id(&commit_id, NULL, rc->commit_id,
852 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
853 	if (error)
854 		goto done;
855 
856 	error = got_object_open_as_commit(&commit, repo, commit_id);
857 	if (error)
858 		goto done;
859 
860 	error = got_object_id_by_path(&tree_id, repo, commit, path);
861 	if (error)
862 		goto done;
863 
864 	error = got_object_open_as_tree(&tree, repo, tree_id);
865 	if (error)
866 		goto done;
867 
868 	nentries = got_object_tree_get_nentries(tree);
869 
870 	index_page_str = qs->index_page_str ? qs->index_page_str : "";
871 	folder = qs->folder ? qs->folder : "";
872 
873 	for (i = 0; i < nentries; i++) {
874 		struct got_tree_entry *te;
875 		mode_t mode;
876 
877 		te = got_object_tree_get_entry(tree, i);
878 
879 		error = got_object_id_str(&id_str, got_tree_entry_get_id(te));
880 		if (error)
881 			goto done;
882 
883 		modestr = strdup("");
884 		if (modestr == NULL) {
885 			error = got_error_from_errno("strdup");
886 			goto done;
887 		}
888 		mode = got_tree_entry_get_mode(te);
889 		if (got_object_tree_entry_is_submodule(te)) {
890 			free(modestr);
891 			modestr = strdup("$");
892 			if (modestr == NULL) {
893 				error = got_error_from_errno("strdup");
894 				goto done;
895 			}
896 		} else if (S_ISLNK(mode)) {
897 			free(modestr);
898 			modestr = strdup("@");
899 			if (modestr == NULL) {
900 				error = got_error_from_errno("strdup");
901 				goto done;
902 			}
903 		} else if (S_ISDIR(mode)) {
904 			free(modestr);
905 			modestr = strdup("/");
906 			if (modestr == NULL) {
907 				error = got_error_from_errno("strdup");
908 				goto done;
909 			}
910 		} else if (mode & S_IXUSR) {
911 			free(modestr);
912 			modestr = strdup("*");
913 			if (modestr == NULL) {
914 				error = got_error_from_errno("strdup");
915 				goto done;
916 			}
917 		}
918 
919 		name = got_tree_entry_get_name(te);
920 		error = gotweb_escape_html(&escaped_name, name);
921 		if (error)
922 			goto done;
923 
924 		if (S_ISDIR(mode)) {
925 			r = fcgi_printf(c,
926 			    "<div class='tree_wrapper'>\n"
927 			    "<div class='tree_line'>"
928 			    "<a class='diff_directory' "
929 			    "href='?index_page=%s&path=%s&action=tree"
930 			    "&commit=%s&folder=%s/%s'>%s%s</a>"
931 			    "</div>\n" /* .tree_line */
932 			    "<div class='tree_line_blank'>&nbsp;</div>\n"
933 			    "</div>\n", /* .tree_wrapper */
934 			    index_page_str, qs->path, rc->commit_id,
935 			    folder, name, escaped_name, modestr);
936 			if (r == -1)
937 				goto done;
938 		} else {
939 			r = fcgi_printf(c,
940 			    "<div class='tree_wrapper'>\n"
941 			    "<div class='tree_line'>"
942 			    "<a href='?index_page=%s&path=%s&action=blob"
943 			    "&commit=%s&folder=%s&file=%s'>%s%s</a>"
944 			    "</div>\n" /* .tree_line */
945 			    "<div class='tree_line_blank'>"
946 			    "<a href='?index_page=%s&path=%s&action=commits"
947 			    "&commit=%s&folder=%s&file=%s'>commits</a>\n"
948 			    " | \n"
949 			    "<a href='?index_page=%s&path=%s&action=blame"
950 			    "&commit=%s&folder=%s&file=%s'>blame</a>\n"
951 			    "</div>\n"  /* .tree_line_blank */
952 			    "</div>\n", /* .tree_wrapper */
953 			    index_page_str, qs->path, rc->commit_id,
954 			    folder, name, escaped_name, modestr,
955 			    index_page_str, qs->path, rc->commit_id,
956 			    folder, name,
957 			    index_page_str, qs->path, rc->commit_id,
958 			    folder, name);
959 			if (r == -1)
960 				goto done;
961 		}
962 		free(id_str);
963 		id_str = NULL;
964 		free(modestr);
965 		modestr = NULL;
966 		free(escaped_name);
967 		escaped_name = NULL;
968 	}
969 done:
970 	free(escaped_name);
971 	free(id_str);
972 	free(modestr);
973 	free(path);
974 	got_ref_list_free(&refs);
975 	if (commit)
976 		got_object_commit_close(commit);
977 	free(commit_id);
978 	free(tree_id);
979 	return error;
980 }
981 
982 const struct got_error *
983 got_output_file_blob(struct request *c)
984 {
985 	const struct got_error *error = NULL;
986 	struct transport *t = c->t;
987 	struct got_repository *repo = t->repo;
988 	struct querystring *qs = c->t->qs;
989 	struct got_commit_object *commit = NULL;
990 	struct got_object_id *commit_id = NULL;
991 	struct got_reflist_head refs;
992 	struct got_blob_object *blob = NULL;
993 	char *path = NULL, *in_repo_path = NULL;
994 	int obj_type, set_mime = 0, fd = -1;
995 	size_t len, hdrlen;
996 	const uint8_t *buf;
997 
998 	TAILQ_INIT(&refs);
999 
1000 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1001 	    qs->folder ? "/" : "", qs->file) == -1) {
1002 		error = got_error_from_errno("asprintf");
1003 		goto done;
1004 	}
1005 
1006 	error = got_repo_map_path(&in_repo_path, repo, path);
1007 	if (error)
1008 		goto done;
1009 
1010 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1011 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1012 	if (error)
1013 		goto done;
1014 
1015 	error = got_object_open_as_commit(&commit, repo, commit_id);
1016 	if (error)
1017 		goto done;
1018 
1019 	error = got_object_id_by_path(&commit_id, repo, commit, in_repo_path);
1020 	if (error)
1021 		goto done;
1022 
1023 	if (commit_id == NULL) {
1024 		error = got_error(GOT_ERR_NO_OBJ);
1025 		goto done;
1026 	}
1027 
1028 	error = got_object_get_type(&obj_type, repo, commit_id);
1029 	if (error)
1030 		goto done;
1031 
1032 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1033 		error = got_error(GOT_ERR_OBJ_TYPE);
1034 		goto done;
1035 	}
1036 
1037 	error = got_gotweb_dupfd(&c->priv_fd[BLOB_FD_1], &fd);
1038 	if (error)
1039 		goto done;
1040 
1041 	error = got_object_open_as_blob(&blob, repo, commit_id, BUF, fd);
1042 	if (error)
1043 		goto done;
1044 	hdrlen = got_object_blob_get_hdrlen(blob);
1045 	do {
1046 		error = got_object_blob_read_block(&len, blob);
1047 		if (error)
1048 			goto done;
1049 		buf = got_object_blob_get_read_buf(blob);
1050 
1051 		/*
1052 		 * Skip blob object header first time around,
1053 		 * which also contains a zero byte.
1054 		 */
1055 		buf += hdrlen;
1056 		if (set_mime == 0) {
1057 			if (isbinary(buf, len - hdrlen)) {
1058 				error = gotweb_render_content_type_file(c,
1059 				    "application/octet-stream",
1060 				    qs->file);
1061 				if (error) {
1062 					log_warnx("%s: %s", __func__,
1063 					    error->msg);
1064 					goto done;
1065 				}
1066 			} else {
1067 				error = gotweb_render_content_type(c,
1068 				  "text/plain");
1069 				if (error) {
1070 					log_warnx("%s: %s", __func__,
1071 					    error->msg);
1072 					goto done;
1073 				}
1074 			}
1075 		}
1076 		set_mime = 1;
1077 		fcgi_gen_binary_response(c, buf, len - hdrlen);
1078 
1079 		hdrlen = 0;
1080 	} while (len != 0);
1081 done:
1082 	if (commit)
1083 		got_object_commit_close(commit);
1084 	if (fd != -1 && close(fd) == -1 && error == NULL)
1085 		error = got_error_from_errno("close");
1086 	if (blob)
1087 		got_object_blob_close(blob);
1088 	free(in_repo_path);
1089 	free(commit_id);
1090 	free(path);
1091 	return error;
1092 }
1093 
1094 struct blame_line {
1095 	int annotated;
1096 	char *id_str;
1097 	char *committer;
1098 	char datebuf[11]; /* YYYY-MM-DD + NUL */
1099 };
1100 
1101 struct blame_cb_args {
1102 	struct blame_line *lines;
1103 	int nlines;
1104 	int nlines_prec;
1105 	int lineno_cur;
1106 	off_t *line_offsets;
1107 	FILE *f;
1108 	struct got_repository *repo;
1109 	struct request *c;
1110 };
1111 
1112 static const struct got_error *
1113 got_gotweb_blame_cb(void *arg, int nlines, int lineno,
1114     struct got_commit_object *commit, struct got_object_id *id)
1115 {
1116 	const struct got_error *err = NULL;
1117 	struct blame_cb_args *a = arg;
1118 	struct blame_line *bline;
1119 	struct request *c = a->c;
1120 	struct transport *t = c->t;
1121 	struct querystring *qs = t->qs;
1122 	struct repo_dir *repo_dir = t->repo_dir;
1123 	const char *index_page_str;
1124 	char *line = NULL, *eline = NULL;
1125 	size_t linesize = 0;
1126 	off_t offset;
1127 	struct tm tm;
1128 	time_t committer_time;
1129 	int r;
1130 
1131 	if (nlines != a->nlines ||
1132 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
1133 		return got_error(GOT_ERR_RANGE);
1134 
1135 	if (lineno == -1)
1136 		return NULL; /* no change in this commit */
1137 
1138 	/* Annotate this line. */
1139 	bline = &a->lines[lineno - 1];
1140 	if (bline->annotated)
1141 		return NULL;
1142 	err = got_object_id_str(&bline->id_str, id);
1143 	if (err)
1144 		return err;
1145 
1146 	bline->committer = strdup(got_object_commit_get_committer(commit));
1147 	if (bline->committer == NULL) {
1148 		err = got_error_from_errno("strdup");
1149 		goto done;
1150 	}
1151 
1152 	committer_time = got_object_commit_get_committer_time(commit);
1153 	if (gmtime_r(&committer_time, &tm) == NULL)
1154 		return got_error_from_errno("gmtime_r");
1155 	if (strftime(bline->datebuf, sizeof(bline->datebuf), "%G-%m-%d",
1156 	    &tm) == 0) {
1157 		err = got_error(GOT_ERR_NO_SPACE);
1158 		goto done;
1159 	}
1160 	bline->annotated = 1;
1161 
1162 	/* Print lines annotated so far. */
1163 	bline = &a->lines[a->lineno_cur - 1];
1164 	if (!bline->annotated)
1165 		goto done;
1166 
1167 	offset = a->line_offsets[a->lineno_cur - 1];
1168 	if (fseeko(a->f, offset, SEEK_SET) == -1) {
1169 		err = got_error_from_errno("fseeko");
1170 		goto done;
1171 	}
1172 
1173 	index_page_str = qs->index_page_str ? qs->index_page_str : "";
1174 
1175 	while (a->lineno_cur <= a->nlines && bline->annotated) {
1176 		char *smallerthan, *at, *nl, *committer;
1177 		size_t len;
1178 
1179 		if (getline(&line, &linesize, a->f) == -1) {
1180 			if (ferror(a->f))
1181 				err = got_error_from_errno("getline");
1182 			break;
1183 		}
1184 
1185 		committer = bline->committer;
1186 		smallerthan = strchr(committer, '<');
1187 		if (smallerthan && smallerthan[1] != '\0')
1188 			committer = smallerthan + 1;
1189 		at = strchr(committer, '@');
1190 		if (at)
1191 			*at = '\0';
1192 		len = strlen(committer);
1193 		if (len >= 9)
1194 			committer[8] = '\0';
1195 
1196 		nl = strchr(line, '\n');
1197 		if (nl)
1198 			*nl = '\0';
1199 
1200 		err = gotweb_escape_html(&eline, line);
1201 		if (err)
1202 			goto done;
1203 
1204 		r = fcgi_printf(c, "<div class='blame_wrapper'>"
1205 		    "<div class='blame_number'>%.*d</div>"
1206 		    "<div class='blame_hash'>"
1207 		    "<a href='?index_page=%s&path=%s&action=diff&commit=%s'>"
1208 		    "%.8s</a>"
1209 		    "</div>"
1210 		    "<div class='blame_date'>%s</div>"
1211 		    "<div class='blame_author'>%s</div>"
1212 		    "<div class='blame_code'>%s</div>"
1213 		    "</div>",	/* .blame_wrapper */
1214 		    a->nlines_prec, a->lineno_cur,
1215 		    index_page_str, repo_dir->name, bline->id_str,
1216 		    bline->id_str,
1217 		    bline->datebuf,
1218 		    committer,
1219 		    eline);
1220 		if (r == -1)
1221 			goto done;
1222 
1223 		a->lineno_cur++;
1224 		bline = &a->lines[a->lineno_cur - 1];
1225 	}
1226 done:
1227 	free(line);
1228 	free(eline);
1229 	return err;
1230 }
1231 
1232 const struct got_error *
1233 got_output_file_blame(struct request *c)
1234 {
1235 	const struct got_error *error = NULL;
1236 	struct transport *t = c->t;
1237 	struct got_repository *repo = t->repo;
1238 	struct querystring *qs = c->t->qs;
1239 	struct got_object_id *obj_id = NULL, *commit_id = NULL;
1240 	struct got_commit_object *commit = NULL;
1241 	struct got_reflist_head refs;
1242 	struct got_blob_object *blob = NULL;
1243 	char *path = NULL, *in_repo_path = NULL;
1244 	struct blame_cb_args bca;
1245 	int i, obj_type, fd1 = -1, fd2 = -1, fd3 = -1, fd4 = -1, fd5 = -1;
1246 	int fd6 = -1;
1247 	off_t filesize;
1248 	FILE *f1 = NULL, *f2 = NULL;
1249 
1250 	TAILQ_INIT(&refs);
1251 	bca.f = NULL;
1252 	bca.lines = NULL;
1253 
1254 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1255 	    qs->folder ? "/" : "", qs->file) == -1) {
1256 		error = got_error_from_errno("asprintf");
1257 		goto done;
1258 	}
1259 
1260 	error = got_repo_map_path(&in_repo_path, repo, path);
1261 	if (error)
1262 		goto done;
1263 
1264 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1265 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1266 	if (error)
1267 		goto done;
1268 
1269 	error = got_object_open_as_commit(&commit, repo, commit_id);
1270 	if (error)
1271 		goto done;
1272 
1273 	error = got_object_id_by_path(&obj_id, repo, commit, in_repo_path);
1274 	if (error)
1275 		goto done;
1276 
1277 	if (commit_id == NULL) {
1278 		error = got_error(GOT_ERR_NO_OBJ);
1279 		goto done;
1280 	}
1281 
1282 	error = got_object_get_type(&obj_type, repo, obj_id);
1283 	if (error)
1284 		goto done;
1285 
1286 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1287 		error = got_error(GOT_ERR_OBJ_TYPE);
1288 		goto done;
1289 	}
1290 
1291 	error = got_gotweb_openfile(&bca.f, &c->priv_fd[BLAME_FD_1], &fd1);
1292 	if (error)
1293 		goto done;
1294 
1295 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_2], &fd2);
1296 	if (error)
1297 		goto done;
1298 
1299 	error = got_object_open_as_blob(&blob, repo, obj_id, BUF, fd2);
1300 	if (error)
1301 		goto done;
1302 
1303 	error = got_object_blob_dump_to_file(&filesize, &bca.nlines,
1304 	    &bca.line_offsets, bca.f, blob);
1305 	if (error || bca.nlines == 0)
1306 		goto done;
1307 
1308 	/* Don't include \n at EOF in the blame line count. */
1309 	if (bca.line_offsets[bca.nlines - 1] == filesize)
1310 		bca.nlines--;
1311 
1312 	bca.lines = calloc(bca.nlines, sizeof(*bca.lines));
1313 	if (bca.lines == NULL) {
1314 		error = got_error_from_errno("calloc");
1315 		goto done;
1316 	}
1317 	bca.lineno_cur = 1;
1318 	bca.nlines_prec = 0;
1319 	i = bca.nlines;
1320 	while (i > 0) {
1321 		i /= 10;
1322 		bca.nlines_prec++;
1323 	}
1324 	bca.repo = repo;
1325 	bca.c = c;
1326 
1327 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_3], &fd3);
1328 	if (error)
1329 		goto done;
1330 
1331 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_4], &fd4);
1332 	if (error)
1333 		goto done;
1334 
1335 	error = got_gotweb_openfile(&f1, &c->priv_fd[BLAME_FD_5], &fd5);
1336 	if (error)
1337 		goto done;
1338 
1339 	error = got_gotweb_openfile(&f2, &c->priv_fd[BLAME_FD_6], &fd6);
1340 	if (error)
1341 		goto done;
1342 
1343 	error = got_blame(in_repo_path, commit_id, repo,
1344 	    GOT_DIFF_ALGORITHM_MYERS, got_gotweb_blame_cb, &bca, NULL, NULL,
1345 	    fd3, fd4, f1, f2);
1346 
1347 	if (blob) {
1348 		free(bca.line_offsets);
1349 		for (i = 0; i < bca.nlines; i++) {
1350 			struct blame_line *bline = &bca.lines[i];
1351 			free(bline->id_str);
1352 			free(bline->committer);
1353 		}
1354 	}
1355 done:
1356 	free(bca.lines);
1357 	if (fd2 != -1 && close(fd2) == -1 && error == NULL)
1358 		error = got_error_from_errno("close");
1359 	if (fd3 != -1 && close(fd3) == -1 && error == NULL)
1360 		error = got_error_from_errno("close");
1361 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1362 		error = got_error_from_errno("close");
1363 	if (bca.f) {
1364 		const struct got_error *bca_err =
1365 		    got_gotweb_flushfile(bca.f, fd1);
1366 		if (error == NULL)
1367 			error = bca_err;
1368 	}
1369 	if (f1) {
1370 		const struct got_error *f1_err =
1371 		    got_gotweb_flushfile(f1, fd5);
1372 		if (error == NULL)
1373 			error = f1_err;
1374 	}
1375 	if (f2) {
1376 		const struct got_error *f2_err =
1377 		    got_gotweb_flushfile(f2, fd6);
1378 		if (error == NULL)
1379 			error = f2_err;
1380 	}
1381 	if (commit)
1382 		got_object_commit_close(commit);
1383 	if (blob)
1384 		got_object_blob_close(blob);
1385 	free(in_repo_path);
1386 	free(commit_id);
1387 	free(path);
1388 	return error;
1389 }
1390 
1391 const struct got_error *
1392 got_output_repo_diff(struct request *c)
1393 {
1394 	const struct got_error *error = NULL;
1395 	struct transport *t = c->t;
1396 	struct got_repository *repo = t->repo;
1397 	struct repo_commit *rc = NULL;
1398 	struct got_object_id *id1 = NULL, *id2 = NULL;
1399 	struct got_reflist_head refs;
1400 	FILE *f1 = NULL, *f2 = NULL, *f3 = NULL;
1401 	char *label1 = NULL, *label2 = NULL, *line = NULL;
1402 	char *newline, *eline = NULL, *color = NULL;
1403 	int obj_type, fd1, fd2, fd3, fd4 = -1, fd5 = -1;
1404 	size_t linesize = 0;
1405 	ssize_t linelen;
1406 	int wrlen = 0;
1407 
1408 	TAILQ_INIT(&refs);
1409 
1410 	error = got_gotweb_openfile(&f1, &c->priv_fd[DIFF_FD_1], &fd1);
1411 	if (error)
1412 		return error;
1413 
1414 	error = got_gotweb_openfile(&f2, &c->priv_fd[DIFF_FD_2], &fd2);
1415 	if (error)
1416 		return error;
1417 
1418 	error = got_gotweb_openfile(&f3, &c->priv_fd[DIFF_FD_3], &fd3);
1419 	if (error)
1420 		return error;
1421 
1422 	rc = TAILQ_FIRST(&t->repo_commits);
1423 
1424 	if (rc->parent_id != NULL &&
1425 	    strncmp(rc->parent_id, "/dev/null", 9) != 0) {
1426 		error = got_repo_match_object_id(&id1, &label1,
1427 		    rc->parent_id, GOT_OBJ_TYPE_ANY,
1428 		    &refs, repo);
1429 		if (error)
1430 			goto done;
1431 	}
1432 
1433 	error = got_repo_match_object_id(&id2, &label2, rc->commit_id,
1434 	    GOT_OBJ_TYPE_ANY, &refs, repo);
1435 	if (error)
1436 		goto done;
1437 
1438 	error = got_object_get_type(&obj_type, repo, id2);
1439 	if (error)
1440 		goto done;
1441 
1442 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_4], &fd4);
1443 	if (error)
1444 		goto done;
1445 
1446 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_5], &fd5);
1447 	if (error)
1448 		goto done;
1449 
1450 	switch (obj_type) {
1451 	case GOT_OBJ_TYPE_BLOB:
1452 		error = got_diff_objects_as_blobs(NULL, NULL, f1, f2, fd4, fd5,
1453 		     id1, id2, NULL, NULL, GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1454 		     repo, f3);
1455 		break;
1456 	case GOT_OBJ_TYPE_TREE:
1457 		error = got_diff_objects_as_trees(NULL, NULL, f1, f2, fd4, fd5,
1458 		    id1, id2, NULL, "", "",  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1459 		    repo, f3);
1460 		break;
1461 	case GOT_OBJ_TYPE_COMMIT:
1462 		error = got_diff_objects_as_commits(NULL, NULL, f1, f2, fd4,
1463 		    fd5, id1, id2, NULL,  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1464 		    repo, f3);
1465 		break;
1466 	default:
1467 		error = got_error(GOT_ERR_OBJ_TYPE);
1468 	}
1469 	if (error)
1470 		goto done;
1471 
1472 	if (fseek(f1, 0, SEEK_SET) == -1) {
1473 		error = got_ferror(f1, GOT_ERR_IO);
1474 		goto done;
1475 	}
1476 
1477 	if (fseek(f2, 0, SEEK_SET) == -1) {
1478 		error = got_ferror(f2, GOT_ERR_IO);
1479 		goto done;
1480 	}
1481 
1482 	if (fseek(f3, 0, SEEK_SET) == -1) {
1483 		error = got_ferror(f3, GOT_ERR_IO);
1484 		goto done;
1485 	}
1486 
1487 	while ((linelen = getline(&line, &linesize, f3)) != -1) {
1488 		if (strncmp(line, "-", 1) == 0) {
1489 			color = strdup("diff_minus");
1490 			if (color == NULL) {
1491 				error = got_error_from_errno("strdup");
1492 				goto done;
1493 			}
1494 		} else if (strncmp(line, "+", 1) == 0) {
1495 			color = strdup("diff_plus");
1496 			if (color == NULL) {
1497 				error = got_error_from_errno("strdup");
1498 				goto done;
1499 			}
1500 		} else if (strncmp(line, "@@", 2) == 0) {
1501 			color = strdup("diff_chunk_header");
1502 			if (color == NULL) {
1503 				error = got_error_from_errno("strdup");
1504 				goto done;
1505 			}
1506 		} else if (strncmp(line, "@@", 2) == 0) {
1507 			color = strdup("diff_chunk_header");
1508 			if (color == NULL) {
1509 				error = got_error_from_errno("strdup");
1510 				goto done;
1511 			}
1512 		} else if (strncmp(line, "commit +", 8) == 0) {
1513 			color = strdup("diff_meta");
1514 			if (color == NULL) {
1515 				error = got_error_from_errno("strdup");
1516 				goto done;
1517 			}
1518 		} else if (strncmp(line, "commit -", 8) == 0) {
1519 			color = strdup("diff_meta");
1520 			if (color == NULL) {
1521 				error = got_error_from_errno("strdup");
1522 				goto done;
1523 			}
1524 		} else if (strncmp(line, "blob +", 6) == 0) {
1525 			color = strdup("diff_meta");
1526 			if (color == NULL) {
1527 				error = got_error_from_errno("strdup");
1528 				goto done;
1529 			}
1530 		} else if (strncmp(line, "blob -", 6) == 0) {
1531 			color = strdup("diff_meta");
1532 			if (color == NULL) {
1533 				error = got_error_from_errno("strdup");
1534 				goto done;
1535 			}
1536 		} else if (strncmp(line, "file +", 6) == 0) {
1537 			color = strdup("diff_meta");
1538 			if (color == NULL) {
1539 				error = got_error_from_errno("strdup");
1540 				goto done;
1541 			}
1542 		} else if (strncmp(line, "file -", 6) == 0) {
1543 			color = strdup("diff_meta");
1544 			if (color == NULL) {
1545 				error = got_error_from_errno("strdup");
1546 				goto done;
1547 			}
1548 		} else if (strncmp(line, "from:", 5) == 0) {
1549 			color = strdup("diff_author");
1550 			if (color == NULL) {
1551 				error = got_error_from_errno("strdup");
1552 				goto done;
1553 			}
1554 		} else if (strncmp(line, "via:", 4) == 0) {
1555 			color = strdup("diff_author");
1556 			if (color == NULL) {
1557 				error = got_error_from_errno("strdup");
1558 				goto done;
1559 			}
1560 		} else if (strncmp(line, "date:", 5) == 0) {
1561 			color = strdup("diff_date");
1562 			if (color == NULL) {
1563 				error = got_error_from_errno("strdup");
1564 				goto done;
1565 			}
1566 		}
1567 
1568 		newline = strchr(line, '\n');
1569 		if (newline)
1570 			*newline = '\0';
1571 
1572 		error = gotweb_escape_html(&eline, line);
1573 		if (error)
1574 			goto done;
1575 
1576 		fcgi_printf(c, "<div class='diff_line %s'>%s</div>\n",
1577 		    color ? color : "", eline);
1578 		free(eline);
1579 		eline = NULL;
1580 
1581 		if (linelen > 0)
1582 			wrlen = wrlen + linelen;
1583 		free(color);
1584 		color = NULL;
1585 	}
1586 	if (linelen == -1 && ferror(f3))
1587 		error = got_error_from_errno("getline");
1588 done:
1589 	free(color);
1590 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1591 		error = got_error_from_errno("close");
1592 	if (fd5 != -1 && close(fd5) == -1 && error == NULL)
1593 		error = got_error_from_errno("close");
1594 	if (f1) {
1595 		const struct got_error *f1_err =
1596 		    got_gotweb_flushfile(f1, fd1);
1597 		if (error == NULL)
1598 			error = f1_err;
1599 	}
1600 	if (f2) {
1601 		const struct got_error *f2_err =
1602 		    got_gotweb_flushfile(f2, fd2);
1603 		if (error == NULL)
1604 			error = f2_err;
1605 	}
1606 	if (f3) {
1607 		const struct got_error *f3_err =
1608 		    got_gotweb_flushfile(f3, fd3);
1609 		if (error == NULL)
1610 			error = f3_err;
1611 	}
1612 	got_ref_list_free(&refs);
1613 	free(line);
1614 	free(eline);
1615 	free(label1);
1616 	free(label2);
1617 	free(id1);
1618 	free(id2);
1619 	return error;
1620 }
1621 
1622 static const struct got_error *
1623 got_init_repo_commit(struct repo_commit **rc)
1624 {
1625 	*rc = calloc(1, sizeof(**rc));
1626 	if (*rc == NULL)
1627 		return got_error_from_errno2("%s: calloc", __func__);
1628 
1629 	(*rc)->path = NULL;
1630 	(*rc)->refs_str = NULL;
1631 	(*rc)->commit_id = NULL;
1632 	(*rc)->committer = NULL;
1633 	(*rc)->author = NULL;
1634 	(*rc)->parent_id = NULL;
1635 	(*rc)->tree_id = NULL;
1636 	(*rc)->commit_msg = NULL;
1637 
1638 	return NULL;
1639 }
1640 
1641 static const struct got_error *
1642 got_init_repo_tag(struct repo_tag **rt)
1643 {
1644 	*rt = calloc(1, sizeof(**rt));
1645 	if (*rt == NULL)
1646 		return got_error_from_errno2("%s: calloc", __func__);
1647 
1648 	(*rt)->commit_id = NULL;
1649 	(*rt)->tag_name = NULL;
1650 	(*rt)->tag_commit = NULL;
1651 	(*rt)->commit_msg = NULL;
1652 	(*rt)->tagger = NULL;
1653 
1654 	return NULL;
1655 }