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 <sha2.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 "got_compat.h"
42 
43 #include "proc.h"
44 #include "gotwebd.h"
45 
46 static const struct got_error *got_init_repo_commit(struct repo_commit **);
47 static const struct got_error *got_init_repo_tag(struct repo_tag **);
48 static const struct got_error *got_get_repo_commit(struct request *,
49     struct repo_commit *, struct got_commit_object *, struct got_reflist_head *,
50     struct got_object_id *);
51 static const struct got_error *got_gotweb_dupfd(int *, int *);
52 static const struct got_error *got_gotweb_openfile(FILE **, int *, int *);
53 static const struct got_error *got_gotweb_blame_cb(void *, int, int,
54     struct got_commit_object *,struct got_object_id *);
55 
56 const struct got_error *
57 got_gotweb_flushfile(FILE *f, int fd)
58 {
59 	if (fseek(f, 0, SEEK_SET) == -1)
60 		return got_error_from_errno("fseek");
61 
62 	if (ftruncate(fd, 0) == -1)
63 		return got_error_from_errno("ftruncate");
64 
65 	if (fsync(fd) == -1)
66 		return got_error_from_errno("fsync");
67 
68 	if (f && fclose(f) == EOF)
69 		return got_error_from_errno("fclose");
70 
71 	if (fd != -1 && close(fd) != -1)
72 		return got_error_from_errno("close");
73 
74 	return NULL;
75 }
76 
77 static const struct got_error *
78 got_gotweb_openfile(FILE **f, int *priv_fd, int *fd)
79 {
80 	*fd = dup(*priv_fd);
81 	if (*fd == -1)
82 		return got_error_from_errno("dup");
83 
84 	*f = fdopen(*fd, "w+");
85 	if (*f == NULL) {
86 		close(*fd);
87 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
88 	}
89 
90 	return NULL;
91 }
92 
93 static const struct got_error *
94 got_gotweb_dupfd(int *priv_fd, int *fd)
95 {
96 	*fd = dup(*priv_fd);
97 
98 	if (*fd == -1)
99 		return got_error_from_errno("dup");
100 
101 	return NULL;
102 }
103 
104 const struct got_error *
105 got_get_repo_owner(char **owner, struct request *c)
106 {
107 	struct server *srv = c->srv;
108 	struct transport *t = c->t;
109 	struct got_repository *repo = t->repo;
110 	const char *gitconfig_owner;
111 
112 	*owner = NULL;
113 
114 	if (srv->show_repo_owner == 0)
115 		return NULL;
116 
117 	gitconfig_owner = got_repo_get_gitconfig_owner(repo);
118 	if (gitconfig_owner) {
119 		*owner = strdup(gitconfig_owner);
120 		if (*owner == NULL)
121 			return got_error_from_errno("strdup");
122 	} else {
123 		*owner = strdup("");
124 		if (*owner == NULL)
125 			return got_error_from_errno("strdup");
126 	}
127 	return NULL;
128 }
129 
130 const struct got_error *
131 got_get_repo_age(time_t *repo_age, struct request *c, const char *refname)
132 {
133 	const struct got_error *error = NULL;
134 	struct server *srv = c->srv;
135 	struct transport *t = c->t;
136 	struct got_repository *repo = t->repo;
137 	struct got_commit_object *commit = NULL;
138 	struct got_reflist_head refs;
139 	struct got_reflist_entry *re;
140 	time_t committer_time = 0, cmp_time = 0;
141 
142 	TAILQ_INIT(&refs);
143 
144 	if (srv->show_repo_age == 0)
145 		return NULL;
146 
147 	error = got_ref_list(&refs, repo, "refs/heads",
148 	    got_ref_cmp_by_name, NULL);
149 	if (error)
150 		goto done;
151 
152 	/*
153 	 * Find the youngest branch tip in the repository, or the age of
154 	 * the a specific branch tip if a name was provided by the caller.
155 	 */
156 	TAILQ_FOREACH(re, &refs, entry) {
157 		struct got_object_id *id = NULL;
158 
159 		if (refname && strcmp(got_ref_get_name(re->ref), refname) != 0)
160 			continue;
161 
162 		error = got_ref_resolve(&id, repo, re->ref);
163 		if (error)
164 			goto done;
165 
166 		error = got_object_open_as_commit(&commit, repo, id);
167 		free(id);
168 		if (error)
169 			goto done;
170 
171 		committer_time =
172 		    got_object_commit_get_committer_time(commit);
173 		got_object_commit_close(commit);
174 		if (cmp_time < committer_time)
175 			cmp_time = committer_time;
176 
177 		if (refname)
178 			break;
179 	}
180 
181 	if (cmp_time != 0)
182 		*repo_age = cmp_time;
183 done:
184 	got_ref_list_free(&refs);
185 	return error;
186 }
187 
188 static const struct got_error *
189 got_get_repo_commit(struct request *c, struct repo_commit *repo_commit,
190     struct got_commit_object *commit, struct got_reflist_head *refs,
191     struct got_object_id *id)
192 {
193 	const struct got_error *error = NULL;
194 	struct got_reflist_entry *re;
195 	struct got_object_id *id2 = NULL;
196 	struct got_object_qid *parent_id;
197 	struct transport *t = c->t;
198 	struct querystring *qs = c->t->qs;
199 	char *commit_msg = NULL, *commit_msg0;
200 
201 	TAILQ_FOREACH(re, refs, entry) {
202 		char *s;
203 		const char *name;
204 		struct got_tag_object *tag = NULL;
205 		struct got_object_id *ref_id;
206 		int cmp;
207 
208 		if (got_ref_is_symbolic(re->ref))
209 			continue;
210 
211 		name = got_ref_get_name(re->ref);
212 		if (strncmp(name, "refs/", 5) == 0)
213 			name += 5;
214 		if (strncmp(name, "got/", 4) == 0)
215 			continue;
216 		if (strncmp(name, "heads/", 6) == 0)
217 			name += 6;
218 		if (strncmp(name, "remotes/", 8) == 0) {
219 			name += 8;
220 			if (strstr(name, "/" GOT_REF_HEAD) != NULL)
221 				continue;
222 		}
223 		error = got_ref_resolve(&ref_id, t->repo, re->ref);
224 		if (error)
225 			return error;
226 		if (strncmp(name, "tags/", 5) == 0) {
227 			error = got_object_open_as_tag(&tag, t->repo, ref_id);
228 			if (error) {
229 				if (error->code != GOT_ERR_OBJ_TYPE) {
230 					free(ref_id);
231 					continue;
232 				}
233 				/*
234 				 * Ref points at something other
235 				 * than a tag.
236 				 */
237 				error = NULL;
238 				tag = NULL;
239 			}
240 		}
241 		cmp = got_object_id_cmp(tag ?
242 		    got_object_tag_get_object_id(tag) : ref_id, id);
243 		free(ref_id);
244 		if (tag)
245 			got_object_tag_close(tag);
246 		if (cmp != 0)
247 			continue;
248 		s = repo_commit->refs_str;
249 		if (asprintf(&repo_commit->refs_str, "%s%s%s", s ? s : "",
250 		    s ? ", " : "", name) == -1) {
251 			error = got_error_from_errno("asprintf");
252 			free(s);
253 			repo_commit->refs_str = NULL;
254 			return error;
255 		}
256 		free(s);
257 	}
258 
259 	error = got_object_id_str(&repo_commit->commit_id, id);
260 	if (error)
261 		return error;
262 
263 	error = got_object_id_str(&repo_commit->tree_id,
264 	    got_object_commit_get_tree_id(commit));
265 	if (error)
266 		return error;
267 
268 	if (qs->action == DIFF) {
269 		parent_id = STAILQ_FIRST(
270 		    got_object_commit_get_parent_ids(commit));
271 		if (parent_id != NULL) {
272 			id2 = got_object_id_dup(&parent_id->id);
273 			error = got_object_id_str(&repo_commit->parent_id, id2);
274 			if (error)
275 				return error;
276 			free(id2);
277 		} else {
278 			repo_commit->parent_id = strdup("/dev/null");
279 			if (repo_commit->parent_id == NULL) {
280 				error = got_error_from_errno("strdup");
281 				return error;
282 			}
283 		}
284 	}
285 
286 	repo_commit->committer_time =
287 	    got_object_commit_get_committer_time(commit);
288 
289 	repo_commit->author =
290 	    strdup(got_object_commit_get_author(commit));
291 	if (repo_commit->author == NULL) {
292 		error = got_error_from_errno("strdup");
293 		return error;
294 	}
295 	repo_commit->committer =
296 	    strdup(got_object_commit_get_committer(commit));
297 	if (repo_commit->committer == NULL) {
298 		error = got_error_from_errno("strdup");
299 		return error;
300 	}
301 	error = got_object_commit_get_logmsg(&commit_msg0, commit);
302 	if (error)
303 		return error;
304 
305 	commit_msg = commit_msg0;
306 	while (*commit_msg == '\n')
307 		commit_msg++;
308 
309 	repo_commit->commit_msg = strdup(commit_msg);
310 	if (repo_commit->commit_msg == NULL)
311 		error = got_error_from_errno("strdup");
312 	free(commit_msg0);
313 	return error;
314 }
315 
316 const struct got_error *
317 got_get_repo_commits(struct request *c, int limit)
318 {
319 	const struct got_error *error = NULL;
320 	struct got_object_id *id = NULL;
321 	struct got_commit_graph *graph = NULL;
322 	struct got_commit_object *commit = NULL;
323 	struct got_reflist_head refs;
324 	struct got_reference *ref = NULL;
325 	struct repo_commit *repo_commit = NULL;
326 	struct server *srv = c->srv;
327 	struct transport *t = c->t;
328 	struct got_repository *repo = t->repo;
329 	struct querystring *qs = t->qs;
330 	struct repo_dir *repo_dir = t->repo_dir;
331 	char *in_repo_path = NULL, *repo_path = NULL, *file_path = NULL;
332 	int chk_next = 0, chk_multi = 0;
333 
334 	TAILQ_INIT(&refs);
335 
336 	if (qs->file != NULL && strlen(qs->file) > 0)
337 		if (asprintf(&file_path, "%s/%s", qs->folder ? qs->folder : "",
338 		    qs->file) == -1)
339 			return got_error_from_errno("asprintf");
340 
341 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
342 	    repo_dir->name) == -1) {
343 		error = got_error_from_errno("asprintf");
344 		goto done;
345 	}
346 
347 	if (qs->commit) {
348 		error = got_repo_match_object_id_prefix(&id, qs->commit,
349 		    GOT_OBJ_TYPE_COMMIT, repo);
350 		if (error)
351 			goto done;
352 	} else {
353 		error = got_ref_open(&ref, repo, qs->headref, 0);
354 		if (error)
355 			goto done;
356 
357 		error = got_ref_resolve(&id, repo, ref);
358 		if (error)
359 			goto done;
360 	}
361 
362 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
363 	if (error)
364 		goto done;
365 
366 	error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name, NULL);
367 	if (error)
368 		goto done;
369 
370 	if (qs->file != NULL && strlen(qs->file) > 0) {
371 		error = got_commit_graph_open(&graph, file_path, 0);
372 		if (error)
373 			goto done;
374 	} else {
375 		error = got_commit_graph_open(&graph, in_repo_path, 0);
376 		if (error)
377 			goto done;
378 	}
379 
380 	error = got_commit_graph_iter_start(graph, id, repo, NULL, NULL);
381 	if (error)
382 		goto done;
383 
384 	for (;;) {
385 		struct got_object_id next_id;
386 
387 		error = got_commit_graph_iter_next(&next_id, graph, repo, NULL,
388 		    NULL);
389 		if (error) {
390 			if (error->code == GOT_ERR_ITER_COMPLETED)
391 				error = NULL;
392 			goto done;
393 		}
394 
395 		error = got_object_open_as_commit(&commit, repo, &next_id);
396 		if (error)
397 			goto done;
398 
399 		error = got_init_repo_commit(&repo_commit);
400 		if (error)
401 			goto done;
402 
403 		error = got_get_repo_commit(c, repo_commit, commit,
404 		    &refs, &next_id);
405 		if (error) {
406 			gotweb_free_repo_commit(repo_commit);
407 			goto done;
408 		}
409 
410 		TAILQ_INSERT_TAIL(&t->repo_commits, repo_commit, entry);
411 
412 		if (!chk_multi || limit != 1 ||
413 		    srv->max_commits_display == 1) {
414 			chk_multi = 1;
415 
416 			/*
417 			 * check for one more commit before breaking,
418 			 * so we know whether to navigate through briefs
419 			 * commits and summary
420 			 */
421 			if (chk_next && (qs->action == BRIEFS ||
422 			    qs->action == COMMITS || qs->action == SUMMARY)) {
423 				t->more_id = strdup(repo_commit->commit_id);
424 				if (t->more_id == NULL) {
425 					error = got_error_from_errno("strdup");
426 					goto done;
427 				}
428 				got_object_commit_close(commit);
429 				commit = NULL;
430 				TAILQ_REMOVE(&t->repo_commits, repo_commit,
431 				    entry);
432 				gotweb_free_repo_commit(repo_commit);
433 				goto done;
434 			}
435 		}
436 		if (error || (limit && --limit == 0)) {
437 			if (qs->file != NULL && *qs->file != '\0')
438 				if (chk_multi == 0)
439 					break;
440 			chk_next = 1;
441 		}
442 		if (commit) {
443 			got_object_commit_close(commit);
444 			commit = NULL;
445 		}
446 	}
447 done:
448 	if (ref)
449 		got_ref_close(ref);
450 	if (commit)
451 		got_object_commit_close(commit);
452 	if (graph)
453 		got_commit_graph_close(graph);
454 	got_ref_list_free(&refs);
455 	free(in_repo_path);
456 	free(file_path);
457 	free(repo_path);
458 	free(id);
459 	return error;
460 }
461 
462 const struct got_error *
463 got_get_repo_tags(struct request *c, int limit)
464 {
465 	const struct got_error *error = NULL;
466 	struct got_object_id *id = NULL;
467 	struct got_commit_object *commit = NULL;
468 	struct got_reflist_head refs;
469 	struct got_reference *ref;
470 	struct got_reflist_entry *re;
471 	struct server *srv = c->srv;
472 	struct transport *t = c->t;
473 	struct got_repository *repo = t->repo;
474 	struct querystring *qs = t->qs;
475 	struct repo_dir *repo_dir = t->repo_dir;
476 	struct got_tag_object *tag = NULL;
477 	struct repo_tag *rt = NULL, *trt = NULL;
478 	char *in_repo_path = NULL, *repo_path = NULL, *id_str = NULL;
479 	char *tag_commit = NULL, *tag_commit0 = NULL;
480 	char *commit_msg = NULL, *commit_msg0 = NULL;
481 	int chk_next = 0, chk_multi = 1, commit_found = 0, c_cnt = 0;
482 
483 	TAILQ_INIT(&refs);
484 
485 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
486 	    repo_dir->name) == -1)
487 		return got_error_from_errno("asprintf");
488 
489 	if (qs->commit == NULL && (qs->action == TAGS || qs->action == RSS)) {
490 		error = got_ref_open(&ref, repo, qs->headref, 0);
491 		if (error)
492 			goto err;
493 		error = got_ref_resolve(&id, repo, ref);
494 		got_ref_close(ref);
495 		if (error)
496 			goto err;
497 	} else if (qs->commit == NULL && qs->action == TAG) {
498 		error = got_error_msg(GOT_ERR_EOF, "commit id missing");
499 		goto err;
500 	} else {
501 		error = got_repo_match_object_id_prefix(&id, qs->commit,
502 		    GOT_OBJ_TYPE_COMMIT, repo);
503 		if (error)
504 			goto err;
505 	}
506 
507 	if (qs->action != SUMMARY && qs->action != TAGS) {
508 		error = got_object_open_as_commit(&commit, repo, id);
509 		if (error)
510 			goto err;
511 		error = got_object_commit_get_logmsg(&commit_msg0, commit);
512 		if (error)
513 			goto err;
514 		if (commit) {
515 			got_object_commit_close(commit);
516 			commit = NULL;
517 		}
518 	}
519 
520 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
521 	if (error)
522 		goto err;
523 
524 	error = got_ref_list(&refs, repo, "refs/tags", got_ref_cmp_tags,
525 	   repo);
526 	if (error)
527 		goto err;
528 
529 	if (limit == 1)
530 		chk_multi = 0;
531 
532 	/*
533 	 * XXX: again, see previous message about caching
534 	 */
535 
536 	TAILQ_FOREACH(re, &refs, entry) {
537 		struct repo_tag *new_repo_tag = NULL;
538 		error = got_init_repo_tag(&new_repo_tag);
539 		if (error)
540 			goto err;
541 
542 		TAILQ_INSERT_TAIL(&t->repo_tags, new_repo_tag, entry);
543 
544 		new_repo_tag->tag_name = strdup(got_ref_get_name(re->ref));
545 		if (new_repo_tag->tag_name == NULL) {
546 			error = got_error_from_errno("strdup");
547 			goto err;
548 		}
549 
550 		free(id);
551 		id = NULL;
552 
553 		free(id_str);
554 		id_str = NULL;
555 
556 		error = got_ref_resolve(&id, repo, re->ref);
557 		if (error)
558 			goto done;
559 
560 		if (tag)
561 			got_object_tag_close(tag);
562 		error = got_object_open_as_tag(&tag, repo, id);
563 		if (error) {
564 			if (error->code != GOT_ERR_OBJ_TYPE)
565 				goto done;
566 			/* "lightweight" tag */
567 			error = got_object_open_as_commit(&commit, repo, id);
568 			if (error)
569 				goto done;
570 			new_repo_tag->tagger =
571 			    strdup(got_object_commit_get_committer(commit));
572 			if (new_repo_tag->tagger == NULL) {
573 				error = got_error_from_errno("strdup");
574 				goto err;
575 			}
576 			new_repo_tag->tagger_time =
577 			    got_object_commit_get_committer_time(commit);
578 			error = got_object_id_str(&id_str, id);
579 			if (error)
580 				goto err;
581 		} else {
582 			new_repo_tag->tagger =
583 			    strdup(got_object_tag_get_tagger(tag));
584 			if (new_repo_tag->tagger == NULL) {
585 				error = got_error_from_errno("strdup");
586 				goto err;
587 			}
588 			new_repo_tag->tagger_time =
589 			    got_object_tag_get_tagger_time(tag);
590 			error = got_object_id_str(&id_str,
591 			    got_object_tag_get_object_id(tag));
592 			if (error)
593 				goto err;
594 		}
595 
596 		new_repo_tag->commit_id = strdup(id_str);
597 		if (new_repo_tag->commit_id == NULL)
598 			goto err;
599 
600 		if (commit_found == 0 && qs->commit != NULL &&
601 		    strncmp(id_str, qs->commit, strlen(id_str)) != 0)
602 			continue;
603 		else
604 			commit_found = 1;
605 
606 		t->tag_count++;
607 
608 		/*
609 		 * check for one more commit before breaking,
610 		 * so we know whether to navigate through briefs
611 		 * commits and summary
612 		 */
613 		if (chk_next) {
614 			t->next_id = strdup(new_repo_tag->commit_id);
615 			if (t->next_id == NULL) {
616 				error = got_error_from_errno("strdup");
617 				goto err;
618 			}
619 			if (commit) {
620 				got_object_commit_close(commit);
621 				commit = NULL;
622 			}
623 			TAILQ_REMOVE(&t->repo_tags, new_repo_tag, entry);
624 			gotweb_free_repo_tag(new_repo_tag);
625 			goto done;
626 		}
627 
628 		if (commit) {
629 			error = got_object_commit_get_logmsg(&tag_commit0,
630 			    commit);
631 			if (error)
632 				goto err;
633 			got_object_commit_close(commit);
634 			commit = NULL;
635 		} else {
636 			tag_commit0 = strdup(got_object_tag_get_message(tag));
637 			if (tag_commit0 == NULL) {
638 				error = got_error_from_errno("strdup");
639 				goto err;
640 			}
641 		}
642 
643 		tag_commit = tag_commit0;
644 		while (*tag_commit == '\n')
645 			tag_commit++;
646 		new_repo_tag->tag_commit = strdup(tag_commit);
647 		if (new_repo_tag->tag_commit == NULL) {
648 			error = got_error_from_errno("strdup");
649 			free(tag_commit0);
650 			goto err;
651 		}
652 		free(tag_commit0);
653 
654 		if (qs->action != SUMMARY && qs->action != TAGS) {
655 			commit_msg = commit_msg0;
656 			while (*commit_msg == '\n')
657 				commit_msg++;
658 
659 			new_repo_tag->commit_msg = strdup(commit_msg);
660 			if (new_repo_tag->commit_msg == NULL) {
661 				error = got_error_from_errno("strdup");
662 				goto err;
663 			}
664 		}
665 
666 		if (limit && --limit == 0) {
667 			if (chk_multi == 0)
668 				break;
669 			chk_next = 1;
670 		}
671 	}
672 
673 done:
674 	/*
675 	 * we have tailq populated, so find previous commit id
676 	 * for navigation through briefs and commits
677 	 */
678 	if (t->tag_count == 0) {
679 		TAILQ_FOREACH_SAFE(rt, &t->repo_tags, entry, trt) {
680 			TAILQ_REMOVE(&t->repo_tags, rt, entry);
681 			gotweb_free_repo_tag(rt);
682 		}
683 	}
684 	if (t->tag_count > 0 && t->prev_id == NULL && qs->commit != NULL) {
685 		commit_found = 0;
686 		TAILQ_FOREACH_REVERSE(rt, &t->repo_tags, repo_tags_head,
687 		    entry) {
688 			if (commit_found == 0 && rt->commit_id != NULL &&
689 			    strcmp(qs->commit, rt->commit_id) != 0) {
690 				continue;
691 			} else
692 				commit_found = 1;
693 			if (c_cnt == srv->max_commits_display ||
694 			    rt == TAILQ_FIRST(&t->repo_tags)) {
695 				t->prev_id = strdup(rt->commit_id);
696 				if (t->prev_id == NULL)
697 					error = got_error_from_errno("strdup");
698 				break;
699 			}
700 			c_cnt++;
701 		}
702 	}
703 err:
704 	if (commit)
705 		got_object_commit_close(commit);
706 	if (tag)
707 		got_object_tag_close(tag);
708 	got_ref_list_free(&refs);
709 	free(commit_msg0);
710 	free(in_repo_path);
711 	free(repo_path);
712 	free(id);
713 	free(id_str);
714 	return error;
715 }
716 
717 int
718 got_output_repo_tree(struct request *c,
719     int (*cb)(struct template *, struct got_tree_entry *))
720 {
721 	const struct got_error *error = NULL;
722 	struct transport *t = c->t;
723 	struct got_commit_object *commit = NULL;
724 	struct got_repository *repo = t->repo;
725 	struct querystring *qs = t->qs;
726 	struct repo_commit *rc = NULL;
727 	struct got_object_id *tree_id = NULL, *commit_id = NULL;
728 	struct got_reflist_head refs;
729 	struct got_tree_object *tree = NULL;
730 	struct got_tree_entry *te;
731 	struct repo_dir *repo_dir = t->repo_dir;
732 	char *escaped_name = NULL, *path = NULL;
733 	int nentries, i;
734 
735 	TAILQ_INIT(&refs);
736 
737 	rc = TAILQ_FIRST(&t->repo_commits);
738 
739 	if (qs->folder != NULL) {
740 		path = strdup(qs->folder);
741 		if (path == NULL) {
742 			error = got_error_from_errno("strdup");
743 			goto done;
744 		}
745 	} else {
746 		error = got_repo_map_path(&path, repo, repo_dir->path);
747 		if (error)
748 			goto done;
749 	}
750 
751 	error = got_repo_match_object_id(&commit_id, NULL, rc->commit_id,
752 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
753 	if (error)
754 		goto done;
755 
756 	error = got_object_open_as_commit(&commit, repo, commit_id);
757 	if (error)
758 		goto done;
759 
760 	error = got_object_id_by_path(&tree_id, repo, commit, path);
761 	if (error)
762 		goto done;
763 
764 	error = got_object_open_as_tree(&tree, repo, tree_id);
765 	if (error)
766 		goto done;
767 
768 	nentries = got_object_tree_get_nentries(tree);
769 
770 	for (i = 0; i < nentries; i++) {
771 		te = got_object_tree_get_entry(tree, i);
772 		if (cb(c->tp, te) == -1) {
773 			error = got_error(GOT_ERR_CANCELLED);
774 			break;
775 		}
776 	}
777 done:
778 	free(escaped_name);
779 	free(path);
780 	got_ref_list_free(&refs);
781 	if (commit)
782 		got_object_commit_close(commit);
783 	if (tree)
784 		got_object_tree_close(tree);
785 	free(commit_id);
786 	free(tree_id);
787 	if (error) {
788 		log_warnx("%s: %s", __func__, error->msg);
789 		return -1;
790 	}
791 	return 0;
792 }
793 
794 const struct got_error *
795 got_open_blob_for_output(struct got_blob_object **blob, int *fd,
796     int *binary, struct request *c)
797 {
798 	const struct got_error *error = NULL;
799 	struct transport *t = c->t;
800 	struct got_repository *repo = t->repo;
801 	struct querystring *qs = c->t->qs;
802 	struct got_commit_object *commit = NULL;
803 	struct got_object_id *commit_id = NULL;
804 	struct got_reflist_head refs;
805 	char *path = NULL, *in_repo_path = NULL;
806 	int obj_type;
807 
808 	TAILQ_INIT(&refs);
809 
810 	*blob = NULL;
811 	*fd = -1;
812 	*binary = 0;
813 
814 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
815 	    qs->folder ? "/" : "", qs->file) == -1) {
816 		error = got_error_from_errno("asprintf");
817 		goto done;
818 	}
819 
820 	error = got_repo_map_path(&in_repo_path, repo, path);
821 	if (error)
822 		goto done;
823 
824 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
825 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
826 	if (error)
827 		goto done;
828 
829 	error = got_object_open_as_commit(&commit, repo, commit_id);
830 	if (error)
831 		goto done;
832 
833 	error = got_object_id_by_path(&commit_id, repo, commit, in_repo_path);
834 	if (error)
835 		goto done;
836 
837 	if (commit_id == NULL) {
838 		error = got_error(GOT_ERR_NO_OBJ);
839 		goto done;
840 	}
841 
842 	error = got_object_get_type(&obj_type, repo, commit_id);
843 	if (error)
844 		goto done;
845 
846 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
847 		error = got_error(GOT_ERR_OBJ_TYPE);
848 		goto done;
849 	}
850 
851 	error = got_gotweb_dupfd(&c->priv_fd[BLOB_FD_1], fd);
852 	if (error)
853 		goto done;
854 
855 	error = got_object_open_as_blob(blob, repo, commit_id, BUF, *fd);
856 	if (error)
857 		goto done;
858 
859 	error = got_object_blob_is_binary(binary, *blob);
860 	if (error)
861 		goto done;
862 
863  done:
864 	if (commit)
865 		got_object_commit_close(commit);
866 
867 	if (error) {
868 		if (*fd != -1)
869 			close(*fd);
870 		if (*blob)
871 			got_object_blob_close(*blob);
872 		*fd = -1;
873 		*blob = NULL;
874 	}
875 
876 	free(in_repo_path);
877 	free(commit_id);
878 	free(path);
879 	return error;
880 }
881 
882 int
883 got_output_blob_by_lines(struct template *tp, struct got_blob_object *blob,
884     int (*cb)(struct template *, const char *, size_t))
885 {
886 	const struct got_error	*err;
887 	char			*line = NULL;
888 	size_t			 linesize = 0;
889 	size_t			 lineno = 0;
890 	ssize_t			 linelen = 0;
891 
892 	for (;;) {
893 		err = got_object_blob_getline(&line, &linelen, &linesize,
894 		    blob);
895 		if (err || linelen == -1)
896 			break;
897 		lineno++;
898 		if (cb(tp, line, lineno) == -1) {
899 			err = got_error(GOT_ERR_CANCELLED);
900 			break;
901 		}
902 	}
903 
904 	free(line);
905 
906 	if (err) {
907 		log_warnx("%s: got_object_blob_getline failed: %s",
908 		    __func__, err->msg);
909 		return -1;
910 	}
911 	return 0;
912 }
913 
914 struct blame_cb_args {
915 	struct blame_line *lines;
916 	int nlines;
917 	int nlines_prec;
918 	int lineno_cur;
919 	off_t *line_offsets;
920 	FILE *f;
921 	struct got_repository *repo;
922 	struct request *c;
923 	got_render_blame_line_cb cb;
924 };
925 
926 static const struct got_error *
927 got_gotweb_blame_cb(void *arg, int nlines, int lineno,
928     struct got_commit_object *commit, struct got_object_id *id)
929 {
930 	const struct got_error *err = NULL;
931 	struct blame_cb_args *a = arg;
932 	struct blame_line *bline;
933 	struct request *c = a->c;
934 	char *line = NULL;
935 	size_t linesize = 0;
936 	off_t offset;
937 	struct tm tm;
938 	time_t committer_time;
939 
940 	if (nlines != a->nlines ||
941 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
942 		return got_error(GOT_ERR_RANGE);
943 
944 	if (lineno == -1)
945 		return NULL; /* no change in this commit */
946 
947 	/* Annotate this line. */
948 	bline = &a->lines[lineno - 1];
949 	if (bline->annotated)
950 		return NULL;
951 	err = got_object_id_str(&bline->id_str, id);
952 	if (err)
953 		return err;
954 
955 	bline->committer = strdup(got_object_commit_get_committer(commit));
956 	if (bline->committer == NULL) {
957 		err = got_error_from_errno("strdup");
958 		goto done;
959 	}
960 
961 	committer_time = got_object_commit_get_committer_time(commit);
962 	if (gmtime_r(&committer_time, &tm) == NULL)
963 		return got_error_from_errno("gmtime_r");
964 	if (strftime(bline->datebuf, sizeof(bline->datebuf), "%G-%m-%d",
965 	    &tm) == 0) {
966 		err = got_error(GOT_ERR_NO_SPACE);
967 		goto done;
968 	}
969 	bline->annotated = 1;
970 
971 	/* Print lines annotated so far. */
972 	bline = &a->lines[a->lineno_cur - 1];
973 	if (!bline->annotated)
974 		goto done;
975 
976 	offset = a->line_offsets[a->lineno_cur - 1];
977 	if (fseeko(a->f, offset, SEEK_SET) == -1) {
978 		err = got_error_from_errno("fseeko");
979 		goto done;
980 	}
981 
982 	while (a->lineno_cur <= a->nlines && bline->annotated) {
983 		if (getline(&line, &linesize, a->f) == -1) {
984 			if (ferror(a->f))
985 				err = got_error_from_errno("getline");
986 			break;
987 		}
988 
989 		if (a->cb(c->tp, line, bline, a->nlines_prec,
990 		    a->lineno_cur) == -1) {
991 			err = got_error(GOT_ERR_CANCELLED);
992 			break;
993 		}
994 
995 		a->lineno_cur++;
996 		bline = &a->lines[a->lineno_cur - 1];
997 	}
998 done:
999 	free(line);
1000 	return err;
1001 }
1002 
1003 const struct got_error *
1004 got_output_file_blame(struct request *c, got_render_blame_line_cb cb)
1005 {
1006 	const struct got_error *error = NULL;
1007 	struct transport *t = c->t;
1008 	struct got_repository *repo = t->repo;
1009 	struct querystring *qs = c->t->qs;
1010 	struct got_object_id *obj_id = NULL, *commit_id = NULL;
1011 	struct got_commit_object *commit = NULL;
1012 	struct got_reflist_head refs;
1013 	struct got_blob_object *blob = NULL;
1014 	char *path = NULL, *in_repo_path = NULL;
1015 	struct blame_cb_args bca;
1016 	int i, obj_type, fd1 = -1, fd2 = -1, fd3 = -1, fd4 = -1, fd5 = -1;
1017 	int fd6 = -1;
1018 	off_t filesize;
1019 	FILE *f1 = NULL, *f2 = NULL;
1020 
1021 	TAILQ_INIT(&refs);
1022 	bca.f = NULL;
1023 	bca.lines = NULL;
1024 	bca.cb = cb;
1025 
1026 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1027 	    qs->folder ? "/" : "", qs->file) == -1) {
1028 		error = got_error_from_errno("asprintf");
1029 		goto done;
1030 	}
1031 
1032 	error = got_repo_map_path(&in_repo_path, repo, path);
1033 	if (error)
1034 		goto done;
1035 
1036 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1037 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1038 	if (error)
1039 		goto done;
1040 
1041 	error = got_object_open_as_commit(&commit, repo, commit_id);
1042 	if (error)
1043 		goto done;
1044 
1045 	error = got_object_id_by_path(&obj_id, repo, commit, in_repo_path);
1046 	if (error)
1047 		goto done;
1048 
1049 	error = got_object_get_type(&obj_type, repo, obj_id);
1050 	if (error)
1051 		goto done;
1052 
1053 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1054 		error = got_error(GOT_ERR_OBJ_TYPE);
1055 		goto done;
1056 	}
1057 
1058 	error = got_gotweb_openfile(&bca.f, &c->priv_fd[BLAME_FD_1], &fd1);
1059 	if (error)
1060 		goto done;
1061 
1062 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_2], &fd2);
1063 	if (error)
1064 		goto done;
1065 
1066 	error = got_object_open_as_blob(&blob, repo, obj_id, BUF, fd2);
1067 	if (error)
1068 		goto done;
1069 
1070 	error = got_object_blob_dump_to_file(&filesize, &bca.nlines,
1071 	    &bca.line_offsets, bca.f, blob);
1072 	if (error || bca.nlines == 0)
1073 		goto done;
1074 
1075 	/* Don't include \n at EOF in the blame line count. */
1076 	if (bca.line_offsets[bca.nlines - 1] == filesize)
1077 		bca.nlines--;
1078 
1079 	bca.lines = calloc(bca.nlines, sizeof(*bca.lines));
1080 	if (bca.lines == NULL) {
1081 		error = got_error_from_errno("calloc");
1082 		goto done;
1083 	}
1084 	bca.lineno_cur = 1;
1085 	bca.nlines_prec = 0;
1086 	i = bca.nlines;
1087 	while (i > 0) {
1088 		i /= 10;
1089 		bca.nlines_prec++;
1090 	}
1091 	bca.repo = repo;
1092 	bca.c = c;
1093 
1094 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_3], &fd3);
1095 	if (error)
1096 		goto done;
1097 
1098 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_4], &fd4);
1099 	if (error)
1100 		goto done;
1101 
1102 	error = got_gotweb_openfile(&f1, &c->priv_fd[BLAME_FD_5], &fd5);
1103 	if (error)
1104 		goto done;
1105 
1106 	error = got_gotweb_openfile(&f2, &c->priv_fd[BLAME_FD_6], &fd6);
1107 	if (error)
1108 		goto done;
1109 
1110 	error = got_blame(in_repo_path, commit_id, repo,
1111 	    GOT_DIFF_ALGORITHM_MYERS, got_gotweb_blame_cb, &bca, NULL, NULL,
1112 	    fd3, fd4, f1, f2);
1113 
1114 done:
1115 	if (bca.lines) {
1116 		free(bca.line_offsets);
1117 		for (i = 0; i < bca.nlines; i++) {
1118 			struct blame_line *bline = &bca.lines[i];
1119 			free(bline->id_str);
1120 			free(bline->committer);
1121 		}
1122 	}
1123 	free(bca.lines);
1124 	if (fd2 != -1 && close(fd2) == -1 && error == NULL)
1125 		error = got_error_from_errno("close");
1126 	if (fd3 != -1 && close(fd3) == -1 && error == NULL)
1127 		error = got_error_from_errno("close");
1128 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1129 		error = got_error_from_errno("close");
1130 	if (bca.f) {
1131 		const struct got_error *bca_err =
1132 		    got_gotweb_flushfile(bca.f, fd1);
1133 		if (error == NULL)
1134 			error = bca_err;
1135 	}
1136 	if (f1) {
1137 		const struct got_error *f1_err =
1138 		    got_gotweb_flushfile(f1, fd5);
1139 		if (error == NULL)
1140 			error = f1_err;
1141 	}
1142 	if (f2) {
1143 		const struct got_error *f2_err =
1144 		    got_gotweb_flushfile(f2, fd6);
1145 		if (error == NULL)
1146 			error = f2_err;
1147 	}
1148 	if (commit)
1149 		got_object_commit_close(commit);
1150 	if (blob)
1151 		got_object_blob_close(blob);
1152 	free(in_repo_path);
1153 	free(commit_id);
1154 	free(obj_id);
1155 	free(path);
1156 	got_ref_list_free(&refs);
1157 	return error;
1158 }
1159 
1160 const struct got_error *
1161 got_open_diff_for_output(FILE **fp, int *fd, struct request *c)
1162 {
1163 	const struct got_error *error = NULL;
1164 	struct transport *t = c->t;
1165 	struct got_repository *repo = t->repo;
1166 	struct repo_commit *rc = NULL;
1167 	struct got_object_id *id1 = NULL, *id2 = NULL;
1168 	struct got_reflist_head refs;
1169 	FILE *f1 = NULL, *f2 = NULL, *f3 = NULL;
1170 	int obj_type, fd1, fd2, fd3, fd4 = -1, fd5 = -1;
1171 
1172 	*fp = NULL;
1173 	*fd = -1;
1174 
1175 	TAILQ_INIT(&refs);
1176 
1177 	error = got_gotweb_openfile(&f1, &c->priv_fd[DIFF_FD_1], &fd1);
1178 	if (error)
1179 		return error;
1180 
1181 	error = got_gotweb_openfile(&f2, &c->priv_fd[DIFF_FD_2], &fd2);
1182 	if (error)
1183 		return error;
1184 
1185 	error = got_gotweb_openfile(&f3, &c->priv_fd[DIFF_FD_3], &fd3);
1186 	if (error)
1187 		return error;
1188 
1189 	rc = TAILQ_FIRST(&t->repo_commits);
1190 
1191 	if (rc->parent_id != NULL &&
1192 	    strncmp(rc->parent_id, "/dev/null", 9) != 0) {
1193 		error = got_repo_match_object_id(&id1, NULL,
1194 		    rc->parent_id, GOT_OBJ_TYPE_ANY,
1195 		    &refs, repo);
1196 		if (error)
1197 			goto done;
1198 	}
1199 
1200 	error = got_repo_match_object_id(&id2, NULL, rc->commit_id,
1201 	    GOT_OBJ_TYPE_ANY, &refs, repo);
1202 	if (error)
1203 		goto done;
1204 
1205 	error = got_object_get_type(&obj_type, repo, id2);
1206 	if (error)
1207 		goto done;
1208 
1209 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_4], &fd4);
1210 	if (error)
1211 		goto done;
1212 
1213 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_5], &fd5);
1214 	if (error)
1215 		goto done;
1216 
1217 	switch (obj_type) {
1218 	case GOT_OBJ_TYPE_BLOB:
1219 		error = got_diff_objects_as_blobs(NULL, NULL, f1, f2, fd4, fd5,
1220 		     id1, id2, NULL, NULL, GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1221 		     NULL, repo, f3);
1222 		break;
1223 	case GOT_OBJ_TYPE_TREE:
1224 		error = got_diff_objects_as_trees(NULL, NULL, f1, f2, fd4, fd5,
1225 		    id1, id2, NULL, "", "",  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1226 		    NULL, repo, f3);
1227 		break;
1228 	case GOT_OBJ_TYPE_COMMIT:
1229 		error = got_diff_objects_as_commits(NULL, NULL, f1, f2, fd4,
1230 		    fd5, id1, id2, NULL,  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1231 		    NULL, repo, f3);
1232 		break;
1233 	default:
1234 		error = got_error(GOT_ERR_OBJ_TYPE);
1235 	}
1236 	if (error)
1237 		goto done;
1238 
1239 	if (fseek(f1, 0, SEEK_SET) == -1) {
1240 		error = got_ferror(f1, GOT_ERR_IO);
1241 		goto done;
1242 	}
1243 
1244 	if (fseek(f2, 0, SEEK_SET) == -1) {
1245 		error = got_ferror(f2, GOT_ERR_IO);
1246 		goto done;
1247 	}
1248 
1249 	if (fseek(f3, 0, SEEK_SET) == -1) {
1250 		error = got_ferror(f3, GOT_ERR_IO);
1251 		goto done;
1252 	}
1253 
1254 	*fp = f3;
1255 	*fd = fd3;
1256 
1257 done:
1258 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1259 		error = got_error_from_errno("close");
1260 	if (fd5 != -1 && close(fd5) == -1 && error == NULL)
1261 		error = got_error_from_errno("close");
1262 	if (f1) {
1263 		const struct got_error *f1_err =
1264 		    got_gotweb_flushfile(f1, fd1);
1265 		if (error == NULL)
1266 			error = f1_err;
1267 	}
1268 	if (f2) {
1269 		const struct got_error *f2_err =
1270 		    got_gotweb_flushfile(f2, fd2);
1271 		if (error == NULL)
1272 			error = f2_err;
1273 	}
1274 	if (error && f3) {
1275 		got_gotweb_flushfile(f3, fd3);
1276 		*fp = NULL;
1277 		*fd = -1;
1278 	}
1279 	got_ref_list_free(&refs);
1280 	free(id1);
1281 	free(id2);
1282 	return error;
1283 }
1284 
1285 static const struct got_error *
1286 got_init_repo_commit(struct repo_commit **rc)
1287 {
1288 	*rc = calloc(1, sizeof(**rc));
1289 	if (*rc == NULL)
1290 		return got_error_from_errno2("%s: calloc", __func__);
1291 
1292 	(*rc)->path = NULL;
1293 	(*rc)->refs_str = NULL;
1294 	(*rc)->commit_id = NULL;
1295 	(*rc)->committer = NULL;
1296 	(*rc)->author = NULL;
1297 	(*rc)->parent_id = NULL;
1298 	(*rc)->tree_id = NULL;
1299 	(*rc)->commit_msg = NULL;
1300 
1301 	return NULL;
1302 }
1303 
1304 static const struct got_error *
1305 got_init_repo_tag(struct repo_tag **rt)
1306 {
1307 	*rt = calloc(1, sizeof(**rt));
1308 	if (*rt == NULL)
1309 		return got_error_from_errno2("%s: calloc", __func__);
1310 
1311 	(*rt)->commit_id = NULL;
1312 	(*rt)->tag_name = NULL;
1313 	(*rt)->tag_commit = NULL;
1314 	(*rt)->commit_msg = NULL;
1315 	(*rt)->tagger = NULL;
1316 
1317 	return NULL;
1318 }