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_blame_cb(void *, int, int,
52     struct got_commit_object *,struct got_object_id *);
53 
54 const struct got_error *
55 got_gotweb_flushfile(FILE *f, int fd)
56 {
57 	if (fseek(f, 0, SEEK_SET) == -1)
58 		return got_error_from_errno("fseek");
59 
60 	if (ftruncate(fd, 0) == -1)
61 		return got_error_from_errno("ftruncate");
62 
63 	if (fsync(fd) == -1)
64 		return got_error_from_errno("fsync");
65 
66 	if (f && fclose(f) == EOF)
67 		return got_error_from_errno("fclose");
68 
69 	if (fd != -1 && close(fd) != -1)
70 		return got_error_from_errno("close");
71 
72 	return NULL;
73 }
74 
75 static const struct got_error *
76 got_gotweb_openfile(FILE **f, int *priv_fd, int *fd)
77 {
78 	*fd = dup(*priv_fd);
79 	if (*fd == -1)
80 		return got_error_from_errno("dup");
81 
82 	*f = fdopen(*fd, "w+");
83 	if (*f == NULL) {
84 		close(*fd);
85 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
86 	}
87 
88 	return NULL;
89 }
90 
91 static const struct got_error *
92 got_gotweb_dupfd(int *priv_fd, int *fd)
93 {
94 	*fd = dup(*priv_fd);
95 
96 	if (*fd < 0)
97 		return NULL;
98 
99 	return NULL;
100 }
101 
102 const struct got_error *
103 got_get_repo_owner(char **owner, struct request *c)
104 {
105 	struct server *srv = c->srv;
106 	struct transport *t = c->t;
107 	struct got_repository *repo = t->repo;
108 	const char *gitconfig_owner;
109 
110 	*owner = NULL;
111 
112 	if (srv->show_repo_owner == 0)
113 		return NULL;
114 
115 	gitconfig_owner = got_repo_get_gitconfig_owner(repo);
116 	if (gitconfig_owner) {
117 		*owner = strdup(gitconfig_owner);
118 		if (*owner == NULL)
119 			return got_error_from_errno("strdup");
120 	} else {
121 		*owner = strdup("");
122 		if (*owner == NULL)
123 			return got_error_from_errno("strdup");
124 	}
125 	return NULL;
126 }
127 
128 const struct got_error *
129 got_get_repo_age(time_t *repo_age, struct request *c, const char *refname)
130 {
131 	const struct got_error *error = NULL;
132 	struct server *srv = c->srv;
133 	struct transport *t = c->t;
134 	struct got_repository *repo = t->repo;
135 	struct got_commit_object *commit = NULL;
136 	struct got_reflist_head refs;
137 	struct got_reflist_entry *re;
138 	time_t committer_time = 0, cmp_time = 0;
139 
140 	TAILQ_INIT(&refs);
141 
142 	if (srv->show_repo_age == 0)
143 		return NULL;
144 
145 	error = got_ref_list(&refs, repo, "refs/heads",
146 	    got_ref_cmp_by_name, NULL);
147 	if (error)
148 		goto done;
149 
150 	/*
151 	 * Find the youngest branch tip in the repository, or the age of
152 	 * the a specific branch tip if a name was provided by the caller.
153 	 */
154 	TAILQ_FOREACH(re, &refs, entry) {
155 		struct got_object_id *id = NULL;
156 
157 		if (refname && strcmp(got_ref_get_name(re->ref), refname) != 0)
158 			continue;
159 
160 		error = got_ref_resolve(&id, repo, re->ref);
161 		if (error)
162 			goto done;
163 
164 		error = got_object_open_as_commit(&commit, repo, id);
165 		free(id);
166 		if (error)
167 			goto done;
168 
169 		committer_time =
170 		    got_object_commit_get_committer_time(commit);
171 		got_object_commit_close(commit);
172 		if (cmp_time < committer_time)
173 			cmp_time = committer_time;
174 
175 		if (refname)
176 			break;
177 	}
178 
179 	if (cmp_time != 0)
180 		*repo_age = cmp_time;
181 done:
182 	got_ref_list_free(&refs);
183 	return error;
184 }
185 
186 static const struct got_error *
187 got_get_repo_commit(struct request *c, struct repo_commit *repo_commit,
188     struct got_commit_object *commit, struct got_reflist_head *refs,
189     struct got_object_id *id)
190 {
191 	const struct got_error *error = NULL;
192 	struct got_reflist_entry *re;
193 	struct got_object_id *id2 = NULL;
194 	struct got_object_qid *parent_id;
195 	struct transport *t = c->t;
196 	struct querystring *qs = c->t->qs;
197 	char *commit_msg = NULL, *commit_msg0;
198 
199 	TAILQ_FOREACH(re, refs, entry) {
200 		char *s;
201 		const char *name;
202 		struct got_tag_object *tag = NULL;
203 		struct got_object_id *ref_id;
204 		int cmp;
205 
206 		if (got_ref_is_symbolic(re->ref))
207 			continue;
208 
209 		name = got_ref_get_name(re->ref);
210 		if (strncmp(name, "refs/", 5) == 0)
211 			name += 5;
212 		if (strncmp(name, "got/", 4) == 0)
213 			continue;
214 		if (strncmp(name, "heads/", 6) == 0)
215 			name += 6;
216 		if (strncmp(name, "remotes/", 8) == 0) {
217 			name += 8;
218 			if (strstr(name, "/" GOT_REF_HEAD) != NULL)
219 				continue;
220 		}
221 		error = got_ref_resolve(&ref_id, t->repo, re->ref);
222 		if (error)
223 			return error;
224 		if (strncmp(name, "tags/", 5) == 0) {
225 			error = got_object_open_as_tag(&tag, t->repo, ref_id);
226 			if (error) {
227 				if (error->code != GOT_ERR_OBJ_TYPE) {
228 					free(ref_id);
229 					continue;
230 				}
231 				/*
232 				 * Ref points at something other
233 				 * than a tag.
234 				 */
235 				error = NULL;
236 				tag = NULL;
237 			}
238 		}
239 		cmp = got_object_id_cmp(tag ?
240 		    got_object_tag_get_object_id(tag) : ref_id, id);
241 		free(ref_id);
242 		if (tag)
243 			got_object_tag_close(tag);
244 		if (cmp != 0)
245 			continue;
246 		s = repo_commit->refs_str;
247 		if (asprintf(&repo_commit->refs_str, "%s%s%s", s ? s : "",
248 		    s ? ", " : "", name) == -1) {
249 			error = got_error_from_errno("asprintf");
250 			free(s);
251 			repo_commit->refs_str = NULL;
252 			return error;
253 		}
254 		free(s);
255 	}
256 
257 	error = got_object_id_str(&repo_commit->commit_id, id);
258 	if (error)
259 		return error;
260 
261 	error = got_object_id_str(&repo_commit->tree_id,
262 	    got_object_commit_get_tree_id(commit));
263 	if (error)
264 		return error;
265 
266 	if (qs->action == DIFF) {
267 		parent_id = STAILQ_FIRST(
268 		    got_object_commit_get_parent_ids(commit));
269 		if (parent_id != NULL) {
270 			id2 = got_object_id_dup(&parent_id->id);
271 			error = got_object_id_str(&repo_commit->parent_id, id2);
272 			if (error)
273 				return error;
274 			free(id2);
275 		} else {
276 			repo_commit->parent_id = strdup("/dev/null");
277 			if (repo_commit->parent_id == NULL) {
278 				error = got_error_from_errno("strdup");
279 				return error;
280 			}
281 		}
282 	}
283 
284 	repo_commit->committer_time =
285 	    got_object_commit_get_committer_time(commit);
286 
287 	repo_commit->author =
288 	    strdup(got_object_commit_get_author(commit));
289 	if (repo_commit->author == NULL) {
290 		error = got_error_from_errno("strdup");
291 		return error;
292 	}
293 	repo_commit->committer =
294 	    strdup(got_object_commit_get_committer(commit));
295 	if (repo_commit->committer == NULL) {
296 		error = got_error_from_errno("strdup");
297 		return error;
298 	}
299 	error = got_object_commit_get_logmsg(&commit_msg0, commit);
300 	if (error)
301 		return error;
302 
303 	commit_msg = commit_msg0;
304 	while (*commit_msg == '\n')
305 		commit_msg++;
306 
307 	repo_commit->commit_msg = strdup(commit_msg);
308 	if (repo_commit->commit_msg == NULL)
309 		error = got_error_from_errno("strdup");
310 	free(commit_msg0);
311 	return error;
312 }
313 
314 const struct got_error *
315 got_get_repo_commits(struct request *c, int limit)
316 {
317 	const struct got_error *error = NULL;
318 	struct got_object_id *id = NULL;
319 	struct got_commit_graph *graph = NULL;
320 	struct got_commit_object *commit = NULL;
321 	struct got_reflist_head refs;
322 	struct got_reference *ref = NULL;
323 	struct repo_commit *repo_commit = NULL;
324 	struct server *srv = c->srv;
325 	struct transport *t = c->t;
326 	struct got_repository *repo = t->repo;
327 	struct querystring *qs = t->qs;
328 	struct repo_dir *repo_dir = t->repo_dir;
329 	char *in_repo_path = NULL, *repo_path = NULL, *file_path = NULL;
330 	int chk_next = 0, chk_multi = 0;
331 
332 	TAILQ_INIT(&refs);
333 
334 	if (qs->file != NULL && strlen(qs->file) > 0)
335 		if (asprintf(&file_path, "%s/%s", qs->folder ? qs->folder : "",
336 		    qs->file) == -1)
337 			return got_error_from_errno("asprintf");
338 
339 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
340 	    repo_dir->name) == -1) {
341 		error = got_error_from_errno("asprintf");
342 		goto done;
343 	}
344 
345 	if (qs->commit) {
346 		error = got_repo_match_object_id_prefix(&id, qs->commit,
347 		    GOT_OBJ_TYPE_COMMIT, repo);
348 		if (error)
349 			goto done;
350 	} else {
351 		error = got_ref_open(&ref, repo, qs->headref, 0);
352 		if (error)
353 			goto done;
354 
355 		error = got_ref_resolve(&id, repo, ref);
356 		if (error)
357 			goto done;
358 	}
359 
360 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
361 	if (error)
362 		goto done;
363 
364 	error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name, NULL);
365 	if (error)
366 		goto done;
367 
368 	if (qs->file != NULL && strlen(qs->file) > 0) {
369 		error = got_commit_graph_open(&graph, file_path, 0);
370 		if (error)
371 			goto done;
372 	} else {
373 		error = got_commit_graph_open(&graph, in_repo_path, 0);
374 		if (error)
375 			goto done;
376 	}
377 
378 	error = got_commit_graph_iter_start(graph, id, repo, NULL, NULL);
379 	if (error)
380 		goto done;
381 
382 	for (;;) {
383 		struct got_object_id next_id;
384 
385 		error = got_commit_graph_iter_next(&next_id, graph, repo, NULL,
386 		    NULL);
387 		if (error) {
388 			if (error->code == GOT_ERR_ITER_COMPLETED)
389 				error = NULL;
390 			goto done;
391 		}
392 
393 		error = got_object_open_as_commit(&commit, repo, &next_id);
394 		if (error)
395 			goto done;
396 
397 		error = got_init_repo_commit(&repo_commit);
398 		if (error)
399 			goto done;
400 
401 		error = got_get_repo_commit(c, repo_commit, commit,
402 		    &refs, &next_id);
403 		if (error) {
404 			gotweb_free_repo_commit(repo_commit);
405 			goto done;
406 		}
407 
408 		TAILQ_INSERT_TAIL(&t->repo_commits, repo_commit, entry);
409 
410 		if (!chk_multi || limit != 1 ||
411 		    srv->max_commits_display == 1) {
412 			chk_multi = 1;
413 
414 			/*
415 			 * check for one more commit before breaking,
416 			 * so we know whether to navigate through briefs
417 			 * commits and summary
418 			 */
419 			if (chk_next && (qs->action == BRIEFS ||
420 			    qs->action == COMMITS || qs->action == SUMMARY)) {
421 				t->next_id = strdup(repo_commit->commit_id);
422 				if (t->next_id == NULL) {
423 					error = got_error_from_errno("strdup");
424 					goto done;
425 				}
426 				if (commit) {
427 					got_object_commit_close(commit);
428 					commit = NULL;
429 				}
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 			break;
774 	}
775 done:
776 	free(escaped_name);
777 	free(path);
778 	got_ref_list_free(&refs);
779 	if (commit)
780 		got_object_commit_close(commit);
781 	if (tree)
782 		got_object_tree_close(tree);
783 	free(commit_id);
784 	free(tree_id);
785 	if (error) {
786 		log_warnx("%s: %s", __func__, error->msg);
787 		return -1;
788 	}
789 	return 0;
790 }
791 
792 const struct got_error *
793 got_open_blob_for_output(struct got_blob_object **blob, int *fd,
794     int *binary, struct request *c)
795 {
796 	const struct got_error *error = NULL;
797 	struct transport *t = c->t;
798 	struct got_repository *repo = t->repo;
799 	struct querystring *qs = c->t->qs;
800 	struct got_commit_object *commit = NULL;
801 	struct got_object_id *commit_id = NULL;
802 	struct got_reflist_head refs;
803 	char *path = NULL, *in_repo_path = NULL;
804 	int obj_type;
805 
806 	TAILQ_INIT(&refs);
807 
808 	*blob = NULL;
809 	*fd = -1;
810 	*binary = 0;
811 
812 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
813 	    qs->folder ? "/" : "", qs->file) == -1) {
814 		error = got_error_from_errno("asprintf");
815 		goto done;
816 	}
817 
818 	error = got_repo_map_path(&in_repo_path, repo, path);
819 	if (error)
820 		goto done;
821 
822 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
823 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
824 	if (error)
825 		goto done;
826 
827 	error = got_object_open_as_commit(&commit, repo, commit_id);
828 	if (error)
829 		goto done;
830 
831 	error = got_object_id_by_path(&commit_id, repo, commit, in_repo_path);
832 	if (error)
833 		goto done;
834 
835 	if (commit_id == NULL) {
836 		error = got_error(GOT_ERR_NO_OBJ);
837 		goto done;
838 	}
839 
840 	error = got_object_get_type(&obj_type, repo, commit_id);
841 	if (error)
842 		goto done;
843 
844 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
845 		error = got_error(GOT_ERR_OBJ_TYPE);
846 		goto done;
847 	}
848 
849 	error = got_gotweb_dupfd(&c->priv_fd[BLOB_FD_1], fd);
850 	if (error)
851 		goto done;
852 
853 	error = got_object_open_as_blob(blob, repo, commit_id, BUF, *fd);
854 	if (error)
855 		goto done;
856 
857 	error = got_object_blob_is_binary(binary, *blob);
858 	if (error)
859 		goto done;
860 
861  done:
862 	if (commit)
863 		got_object_commit_close(commit);
864 
865 	if (error) {
866 		if (*fd != -1)
867 			close(*fd);
868 		if (*blob)
869 			got_object_blob_close(*blob);
870 		*fd = -1;
871 		*blob = NULL;
872 	}
873 
874 	free(in_repo_path);
875 	free(commit_id);
876 	free(path);
877 	return error;
878 }
879 
880 int
881 got_output_blob_by_lines(struct template *tp, struct got_blob_object *blob,
882     int (*cb)(struct template *, const char *, size_t))
883 {
884 	const struct got_error	*err;
885 	char			*line = NULL;
886 	size_t			 linesize = 0;
887 	size_t			 lineno = 0;
888 	ssize_t			 linelen = 0;
889 
890 	for (;;) {
891 		err = got_object_blob_getline(&line, &linelen, &linesize,
892 		    blob);
893 		if (err || linelen == -1)
894 			break;
895 		lineno++;
896 		if (cb(tp, line, lineno) == -1)
897 			break;
898 	}
899 
900 	free(line);
901 
902 	if (err) {
903 		log_warnx("%s: got_object_blob_getline failed: %s",
904 		    __func__, err->msg);
905 		return -1;
906 	}
907 	return 0;
908 }
909 
910 struct blame_cb_args {
911 	struct blame_line *lines;
912 	int nlines;
913 	int nlines_prec;
914 	int lineno_cur;
915 	off_t *line_offsets;
916 	FILE *f;
917 	struct got_repository *repo;
918 	struct request *c;
919 	got_render_blame_line_cb cb;
920 };
921 
922 static const struct got_error *
923 got_gotweb_blame_cb(void *arg, int nlines, int lineno,
924     struct got_commit_object *commit, struct got_object_id *id)
925 {
926 	const struct got_error *err = NULL;
927 	struct blame_cb_args *a = arg;
928 	struct blame_line *bline;
929 	struct request *c = a->c;
930 	char *line = NULL;
931 	size_t linesize = 0;
932 	off_t offset;
933 	struct tm tm;
934 	time_t committer_time;
935 
936 	if (nlines != a->nlines ||
937 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
938 		return got_error(GOT_ERR_RANGE);
939 
940 	if (lineno == -1)
941 		return NULL; /* no change in this commit */
942 
943 	/* Annotate this line. */
944 	bline = &a->lines[lineno - 1];
945 	if (bline->annotated)
946 		return NULL;
947 	err = got_object_id_str(&bline->id_str, id);
948 	if (err)
949 		return err;
950 
951 	bline->committer = strdup(got_object_commit_get_committer(commit));
952 	if (bline->committer == NULL) {
953 		err = got_error_from_errno("strdup");
954 		goto done;
955 	}
956 
957 	committer_time = got_object_commit_get_committer_time(commit);
958 	if (gmtime_r(&committer_time, &tm) == NULL)
959 		return got_error_from_errno("gmtime_r");
960 	if (strftime(bline->datebuf, sizeof(bline->datebuf), "%G-%m-%d",
961 	    &tm) == 0) {
962 		err = got_error(GOT_ERR_NO_SPACE);
963 		goto done;
964 	}
965 	bline->annotated = 1;
966 
967 	/* Print lines annotated so far. */
968 	bline = &a->lines[a->lineno_cur - 1];
969 	if (!bline->annotated)
970 		goto done;
971 
972 	offset = a->line_offsets[a->lineno_cur - 1];
973 	if (fseeko(a->f, offset, SEEK_SET) == -1) {
974 		err = got_error_from_errno("fseeko");
975 		goto done;
976 	}
977 
978 	while (a->lineno_cur <= a->nlines && bline->annotated) {
979 		if (getline(&line, &linesize, a->f) == -1) {
980 			if (ferror(a->f))
981 				err = got_error_from_errno("getline");
982 			break;
983 		}
984 
985 		if (a->cb(c->tp, line, bline, a->nlines_prec,
986 		    a->lineno_cur) == -1)
987 			break;
988 
989 		a->lineno_cur++;
990 		bline = &a->lines[a->lineno_cur - 1];
991 	}
992 done:
993 	free(line);
994 	return err;
995 }
996 
997 const struct got_error *
998 got_output_file_blame(struct request *c, got_render_blame_line_cb cb)
999 {
1000 	const struct got_error *error = NULL;
1001 	struct transport *t = c->t;
1002 	struct got_repository *repo = t->repo;
1003 	struct querystring *qs = c->t->qs;
1004 	struct got_object_id *obj_id = NULL, *commit_id = NULL;
1005 	struct got_commit_object *commit = NULL;
1006 	struct got_reflist_head refs;
1007 	struct got_blob_object *blob = NULL;
1008 	char *path = NULL, *in_repo_path = NULL;
1009 	struct blame_cb_args bca;
1010 	int i, obj_type, fd1 = -1, fd2 = -1, fd3 = -1, fd4 = -1, fd5 = -1;
1011 	int fd6 = -1;
1012 	off_t filesize;
1013 	FILE *f1 = NULL, *f2 = NULL;
1014 
1015 	TAILQ_INIT(&refs);
1016 	bca.f = NULL;
1017 	bca.lines = NULL;
1018 	bca.cb = cb;
1019 
1020 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1021 	    qs->folder ? "/" : "", qs->file) == -1) {
1022 		error = got_error_from_errno("asprintf");
1023 		goto done;
1024 	}
1025 
1026 	error = got_repo_map_path(&in_repo_path, repo, path);
1027 	if (error)
1028 		goto done;
1029 
1030 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1031 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1032 	if (error)
1033 		goto done;
1034 
1035 	error = got_object_open_as_commit(&commit, repo, commit_id);
1036 	if (error)
1037 		goto done;
1038 
1039 	error = got_object_id_by_path(&obj_id, repo, commit, in_repo_path);
1040 	if (error)
1041 		goto done;
1042 
1043 	error = got_object_get_type(&obj_type, repo, obj_id);
1044 	if (error)
1045 		goto done;
1046 
1047 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1048 		error = got_error(GOT_ERR_OBJ_TYPE);
1049 		goto done;
1050 	}
1051 
1052 	error = got_gotweb_openfile(&bca.f, &c->priv_fd[BLAME_FD_1], &fd1);
1053 	if (error)
1054 		goto done;
1055 
1056 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_2], &fd2);
1057 	if (error)
1058 		goto done;
1059 
1060 	error = got_object_open_as_blob(&blob, repo, obj_id, BUF, fd2);
1061 	if (error)
1062 		goto done;
1063 
1064 	error = got_object_blob_dump_to_file(&filesize, &bca.nlines,
1065 	    &bca.line_offsets, bca.f, blob);
1066 	if (error || bca.nlines == 0)
1067 		goto done;
1068 
1069 	/* Don't include \n at EOF in the blame line count. */
1070 	if (bca.line_offsets[bca.nlines - 1] == filesize)
1071 		bca.nlines--;
1072 
1073 	bca.lines = calloc(bca.nlines, sizeof(*bca.lines));
1074 	if (bca.lines == NULL) {
1075 		error = got_error_from_errno("calloc");
1076 		goto done;
1077 	}
1078 	bca.lineno_cur = 1;
1079 	bca.nlines_prec = 0;
1080 	i = bca.nlines;
1081 	while (i > 0) {
1082 		i /= 10;
1083 		bca.nlines_prec++;
1084 	}
1085 	bca.repo = repo;
1086 	bca.c = c;
1087 
1088 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_3], &fd3);
1089 	if (error)
1090 		goto done;
1091 
1092 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_4], &fd4);
1093 	if (error)
1094 		goto done;
1095 
1096 	error = got_gotweb_openfile(&f1, &c->priv_fd[BLAME_FD_5], &fd5);
1097 	if (error)
1098 		goto done;
1099 
1100 	error = got_gotweb_openfile(&f2, &c->priv_fd[BLAME_FD_6], &fd6);
1101 	if (error)
1102 		goto done;
1103 
1104 	error = got_blame(in_repo_path, commit_id, repo,
1105 	    GOT_DIFF_ALGORITHM_MYERS, got_gotweb_blame_cb, &bca, NULL, NULL,
1106 	    fd3, fd4, f1, f2);
1107 
1108 done:
1109 	if (bca.lines) {
1110 		free(bca.line_offsets);
1111 		for (i = 0; i < bca.nlines; i++) {
1112 			struct blame_line *bline = &bca.lines[i];
1113 			free(bline->id_str);
1114 			free(bline->committer);
1115 		}
1116 	}
1117 	free(bca.lines);
1118 	if (fd2 != -1 && close(fd2) == -1 && error == NULL)
1119 		error = got_error_from_errno("close");
1120 	if (fd3 != -1 && close(fd3) == -1 && error == NULL)
1121 		error = got_error_from_errno("close");
1122 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1123 		error = got_error_from_errno("close");
1124 	if (bca.f) {
1125 		const struct got_error *bca_err =
1126 		    got_gotweb_flushfile(bca.f, fd1);
1127 		if (error == NULL)
1128 			error = bca_err;
1129 	}
1130 	if (f1) {
1131 		const struct got_error *f1_err =
1132 		    got_gotweb_flushfile(f1, fd5);
1133 		if (error == NULL)
1134 			error = f1_err;
1135 	}
1136 	if (f2) {
1137 		const struct got_error *f2_err =
1138 		    got_gotweb_flushfile(f2, fd6);
1139 		if (error == NULL)
1140 			error = f2_err;
1141 	}
1142 	if (commit)
1143 		got_object_commit_close(commit);
1144 	if (blob)
1145 		got_object_blob_close(blob);
1146 	free(in_repo_path);
1147 	free(commit_id);
1148 	free(obj_id);
1149 	free(path);
1150 	got_ref_list_free(&refs);
1151 	return error;
1152 }
1153 
1154 const struct got_error *
1155 got_open_diff_for_output(FILE **fp, int *fd, struct request *c)
1156 {
1157 	const struct got_error *error = NULL;
1158 	struct transport *t = c->t;
1159 	struct got_repository *repo = t->repo;
1160 	struct repo_commit *rc = NULL;
1161 	struct got_object_id *id1 = NULL, *id2 = NULL;
1162 	struct got_reflist_head refs;
1163 	FILE *f1 = NULL, *f2 = NULL, *f3 = NULL;
1164 	int obj_type, fd1, fd2, fd3, fd4 = -1, fd5 = -1;
1165 
1166 	*fp = NULL;
1167 	*fd = -1;
1168 
1169 	TAILQ_INIT(&refs);
1170 
1171 	error = got_gotweb_openfile(&f1, &c->priv_fd[DIFF_FD_1], &fd1);
1172 	if (error)
1173 		return error;
1174 
1175 	error = got_gotweb_openfile(&f2, &c->priv_fd[DIFF_FD_2], &fd2);
1176 	if (error)
1177 		return error;
1178 
1179 	error = got_gotweb_openfile(&f3, &c->priv_fd[DIFF_FD_3], &fd3);
1180 	if (error)
1181 		return error;
1182 
1183 	rc = TAILQ_FIRST(&t->repo_commits);
1184 
1185 	if (rc->parent_id != NULL &&
1186 	    strncmp(rc->parent_id, "/dev/null", 9) != 0) {
1187 		error = got_repo_match_object_id(&id1, NULL,
1188 		    rc->parent_id, GOT_OBJ_TYPE_ANY,
1189 		    &refs, repo);
1190 		if (error)
1191 			goto done;
1192 	}
1193 
1194 	error = got_repo_match_object_id(&id2, NULL, rc->commit_id,
1195 	    GOT_OBJ_TYPE_ANY, &refs, repo);
1196 	if (error)
1197 		goto done;
1198 
1199 	error = got_object_get_type(&obj_type, repo, id2);
1200 	if (error)
1201 		goto done;
1202 
1203 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_4], &fd4);
1204 	if (error)
1205 		goto done;
1206 
1207 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_5], &fd5);
1208 	if (error)
1209 		goto done;
1210 
1211 	switch (obj_type) {
1212 	case GOT_OBJ_TYPE_BLOB:
1213 		error = got_diff_objects_as_blobs(NULL, NULL, f1, f2, fd4, fd5,
1214 		     id1, id2, NULL, NULL, GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1215 		     NULL, repo, f3);
1216 		break;
1217 	case GOT_OBJ_TYPE_TREE:
1218 		error = got_diff_objects_as_trees(NULL, NULL, f1, f2, fd4, fd5,
1219 		    id1, id2, NULL, "", "",  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1220 		    NULL, repo, f3);
1221 		break;
1222 	case GOT_OBJ_TYPE_COMMIT:
1223 		error = got_diff_objects_as_commits(NULL, NULL, f1, f2, fd4,
1224 		    fd5, id1, id2, NULL,  GOT_DIFF_ALGORITHM_MYERS, 3, 0, 0,
1225 		    NULL, repo, f3);
1226 		break;
1227 	default:
1228 		error = got_error(GOT_ERR_OBJ_TYPE);
1229 	}
1230 	if (error)
1231 		goto done;
1232 
1233 	if (fseek(f1, 0, SEEK_SET) == -1) {
1234 		error = got_ferror(f1, GOT_ERR_IO);
1235 		goto done;
1236 	}
1237 
1238 	if (fseek(f2, 0, SEEK_SET) == -1) {
1239 		error = got_ferror(f2, GOT_ERR_IO);
1240 		goto done;
1241 	}
1242 
1243 	if (fseek(f3, 0, SEEK_SET) == -1) {
1244 		error = got_ferror(f3, GOT_ERR_IO);
1245 		goto done;
1246 	}
1247 
1248 	*fp = f3;
1249 	*fd = fd3;
1250 
1251 done:
1252 	if (fd4 != -1 && close(fd4) == -1 && error == NULL)
1253 		error = got_error_from_errno("close");
1254 	if (fd5 != -1 && close(fd5) == -1 && error == NULL)
1255 		error = got_error_from_errno("close");
1256 	if (f1) {
1257 		const struct got_error *f1_err =
1258 		    got_gotweb_flushfile(f1, fd1);
1259 		if (error == NULL)
1260 			error = f1_err;
1261 	}
1262 	if (f2) {
1263 		const struct got_error *f2_err =
1264 		    got_gotweb_flushfile(f2, fd2);
1265 		if (error == NULL)
1266 			error = f2_err;
1267 	}
1268 	if (error && f3) {
1269 		got_gotweb_flushfile(f3, fd3);
1270 		*fp = NULL;
1271 		*fd = -1;
1272 	}
1273 	got_ref_list_free(&refs);
1274 	free(id1);
1275 	free(id2);
1276 	return error;
1277 }
1278 
1279 static const struct got_error *
1280 got_init_repo_commit(struct repo_commit **rc)
1281 {
1282 	*rc = calloc(1, sizeof(**rc));
1283 	if (*rc == NULL)
1284 		return got_error_from_errno2("%s: calloc", __func__);
1285 
1286 	(*rc)->path = NULL;
1287 	(*rc)->refs_str = NULL;
1288 	(*rc)->commit_id = NULL;
1289 	(*rc)->committer = NULL;
1290 	(*rc)->author = NULL;
1291 	(*rc)->parent_id = NULL;
1292 	(*rc)->tree_id = NULL;
1293 	(*rc)->commit_msg = NULL;
1294 
1295 	return NULL;
1296 }
1297 
1298 static const struct got_error *
1299 got_init_repo_tag(struct repo_tag **rt)
1300 {
1301 	*rt = calloc(1, sizeof(**rt));
1302 	if (*rt == NULL)
1303 		return got_error_from_errno2("%s: calloc", __func__);
1304 
1305 	(*rt)->commit_id = NULL;
1306 	(*rt)->tag_name = NULL;
1307 	(*rt)->tag_commit = NULL;
1308 	(*rt)->commit_msg = NULL;
1309 	(*rt)->tagger = NULL;
1310 
1311 	return NULL;
1312 }