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 <sha2.h>
26 #include <stdlib.h>
27 #include <stdio.h>
28 #include <string.h>
29 #include <unistd.h>
30 
31 #include "got_error.h"
32 #include "got_object.h"
33 #include "got_reference.h"
34 #include "got_repository.h"
35 #include "got_path.h"
36 #include "got_cancel.h"
37 #include "got_diff.h"
38 #include "got_commit_graph.h"
39 #include "got_blame.h"
40 #include "got_privsep.h"
41 
42 #include "proc.h"
43 #include "gotwebd.h"
44 
45 static const struct got_error *got_init_repo_commit(struct repo_commit **);
46 static const struct got_error *got_init_repo_tag(struct repo_tag **);
47 static const struct got_error *got_get_repo_commit(struct request *,
48     struct repo_commit *, struct got_commit_object *, struct got_reflist_head *,
49     struct got_object_id *);
50 static const struct got_error *got_gotweb_dupfd(int *, int *);
51 static const struct got_error *got_gotweb_openfile(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 const struct got_error *
56 got_gotweb_closefile(FILE *f)
57 {
58 	const struct got_error *err = NULL;
59 
60 	if (fseek(f, 0, SEEK_SET) == -1)
61 		err = got_error_from_errno("fseek");
62 
63 	if (err == NULL && ftruncate(fileno(f), 0) == -1)
64 		err = got_error_from_errno("ftruncate");
65 
66 	if (fclose(f) == EOF && err == NULL)
67 		err = got_error_from_errno("fclose");
68 
69 	return err;
70 }
71 
72 static const struct got_error *
73 got_gotweb_openfile(FILE **f, int *priv_fd)
74 {
75 	int fd;
76 
77 	fd = dup(*priv_fd);
78 	if (fd == -1)
79 		return got_error_from_errno("dup");
80 
81 	*f = fdopen(fd, "w+");
82 	if (*f == NULL) {
83 		close(fd);
84 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
85 	}
86 
87 	return NULL;
88 }
89 
90 static const struct got_error *
91 got_gotweb_dupfd(int *priv_fd, int *fd)
92 {
93 	*fd = dup(*priv_fd);
94 
95 	if (*fd == -1)
96 		return got_error_from_errno("dup");
97 
98 	return NULL;
99 }
100 
101 const struct got_error *
102 got_get_repo_owner(char **owner, struct request *c)
103 {
104 	struct server *srv = c->srv;
105 	struct transport *t = c->t;
106 	struct got_repository *repo = t->repo;
107 	const char *gitconfig_owner;
108 
109 	*owner = NULL;
110 
111 	if (srv->show_repo_owner == 0)
112 		return NULL;
113 
114 	gitconfig_owner = got_repo_get_gitconfig_owner(repo);
115 	if (gitconfig_owner) {
116 		*owner = strdup(gitconfig_owner);
117 		if (*owner == NULL)
118 			return got_error_from_errno("strdup");
119 	} else {
120 		*owner = strdup("");
121 		if (*owner == NULL)
122 			return got_error_from_errno("strdup");
123 	}
124 	return NULL;
125 }
126 
127 const struct got_error *
128 got_get_repo_age(time_t *repo_age, struct request *c, const char *refname)
129 {
130 	const struct got_error *error = NULL;
131 	struct server *srv = c->srv;
132 	struct transport *t = c->t;
133 	struct got_repository *repo = t->repo;
134 	struct got_commit_object *commit = NULL;
135 	struct got_reflist_head refs;
136 	struct got_reflist_entry *re;
137 	time_t committer_time = 0, cmp_time = 0;
138 
139 	TAILQ_INIT(&refs);
140 
141 	if (srv->show_repo_age == 0)
142 		return NULL;
143 
144 	error = got_ref_list(&refs, repo, "refs/heads",
145 	    got_ref_cmp_by_name, NULL);
146 	if (error)
147 		goto done;
148 
149 	/*
150 	 * Find the youngest branch tip in the repository, or the age of
151 	 * the a specific branch tip if a name was provided by the caller.
152 	 */
153 	TAILQ_FOREACH(re, &refs, entry) {
154 		struct got_object_id *id = NULL;
155 
156 		if (refname && strcmp(got_ref_get_name(re->ref), refname) != 0)
157 			continue;
158 
159 		error = got_ref_resolve(&id, repo, re->ref);
160 		if (error)
161 			goto done;
162 
163 		error = got_object_open_as_commit(&commit, repo, id);
164 		free(id);
165 		if (error)
166 			goto done;
167 
168 		committer_time =
169 		    got_object_commit_get_committer_time(commit);
170 		got_object_commit_close(commit);
171 		if (cmp_time < committer_time)
172 			cmp_time = committer_time;
173 
174 		if (refname)
175 			break;
176 	}
177 
178 	if (cmp_time != 0)
179 		*repo_age = cmp_time;
180  done:
181 	got_ref_list_free(&refs);
182 	return error;
183 }
184 
185 static const struct got_error *
186 got_get_repo_commit(struct request *c, struct repo_commit *repo_commit,
187     struct got_commit_object *commit, struct got_reflist_head *refs,
188     struct got_object_id *id)
189 {
190 	const struct got_error *error = NULL;
191 	struct got_reflist_entry *re;
192 	struct got_object_id *id2 = NULL;
193 	struct got_object_qid *parent_id;
194 	struct transport *t = c->t;
195 	struct querystring *qs = c->t->qs;
196 	char *commit_msg = NULL, *commit_msg0;
197 
198 	TAILQ_FOREACH(re, refs, entry) {
199 		char *s;
200 		const char *name;
201 		struct got_tag_object *tag = NULL;
202 		struct got_object_id *ref_id;
203 		int cmp;
204 
205 		if (got_ref_is_symbolic(re->ref))
206 			continue;
207 
208 		name = got_ref_get_name(re->ref);
209 		if (strncmp(name, "refs/", 5) == 0)
210 			name += 5;
211 		if (strncmp(name, "got/", 4) == 0)
212 			continue;
213 		if (strncmp(name, "heads/", 6) == 0)
214 			name += 6;
215 		if (strncmp(name, "remotes/", 8) == 0) {
216 			name += 8;
217 			if (strstr(name, "/" GOT_REF_HEAD) != NULL)
218 				continue;
219 		}
220 		error = got_ref_resolve(&ref_id, t->repo, re->ref);
221 		if (error)
222 			return error;
223 		if (strncmp(name, "tags/", 5) == 0) {
224 			error = got_object_open_as_tag(&tag, t->repo, ref_id);
225 			if (error) {
226 				if (error->code != GOT_ERR_OBJ_TYPE) {
227 					free(ref_id);
228 					continue;
229 				}
230 				/*
231 				 * Ref points at something other
232 				 * than a tag.
233 				 */
234 				error = NULL;
235 				tag = NULL;
236 			}
237 		}
238 		cmp = got_object_id_cmp(tag ?
239 		    got_object_tag_get_object_id(tag) : ref_id, id);
240 		free(ref_id);
241 		if (tag)
242 			got_object_tag_close(tag);
243 		if (cmp != 0)
244 			continue;
245 		s = repo_commit->refs_str;
246 		if (asprintf(&repo_commit->refs_str, "%s%s%s", s ? s : "",
247 		    s ? ", " : "", name) == -1) {
248 			error = got_error_from_errno("asprintf");
249 			free(s);
250 			repo_commit->refs_str = NULL;
251 			return error;
252 		}
253 		free(s);
254 	}
255 
256 	error = got_object_id_str(&repo_commit->commit_id, id);
257 	if (error)
258 		return error;
259 
260 	error = got_object_id_str(&repo_commit->tree_id,
261 	    got_object_commit_get_tree_id(commit));
262 	if (error)
263 		return error;
264 
265 	if (qs->action == DIFF) {
266 		parent_id = STAILQ_FIRST(
267 		    got_object_commit_get_parent_ids(commit));
268 		if (parent_id != NULL) {
269 			id2 = got_object_id_dup(&parent_id->id);
270 			error = got_object_id_str(&repo_commit->parent_id, id2);
271 			if (error)
272 				return error;
273 			free(id2);
274 		} else {
275 			repo_commit->parent_id = strdup("/dev/null");
276 			if (repo_commit->parent_id == NULL) {
277 				error = got_error_from_errno("strdup");
278 				return error;
279 			}
280 		}
281 	}
282 
283 	repo_commit->committer_time =
284 	    got_object_commit_get_committer_time(commit);
285 
286 	repo_commit->author =
287 	    strdup(got_object_commit_get_author(commit));
288 	if (repo_commit->author == NULL) {
289 		error = got_error_from_errno("strdup");
290 		return error;
291 	}
292 	repo_commit->committer =
293 	    strdup(got_object_commit_get_committer(commit));
294 	if (repo_commit->committer == NULL) {
295 		error = got_error_from_errno("strdup");
296 		return error;
297 	}
298 	error = got_object_commit_get_logmsg(&commit_msg0, commit);
299 	if (error)
300 		return error;
301 
302 	commit_msg = commit_msg0;
303 	while (*commit_msg == '\n')
304 		commit_msg++;
305 
306 	repo_commit->commit_msg = strdup(commit_msg);
307 	if (repo_commit->commit_msg == NULL)
308 		error = got_error_from_errno("strdup");
309 	free(commit_msg0);
310 	return error;
311 }
312 
313 const struct got_error *
314 got_get_repo_commits(struct request *c, int limit)
315 {
316 	const struct got_error *error = NULL;
317 	struct got_object_id *id = NULL;
318 	struct got_commit_graph *graph = NULL;
319 	struct got_commit_object *commit = NULL;
320 	struct got_reflist_head refs;
321 	struct got_reference *ref = NULL;
322 	struct repo_commit *repo_commit = NULL;
323 	struct server *srv = c->srv;
324 	struct transport *t = c->t;
325 	struct got_repository *repo = t->repo;
326 	struct querystring *qs = t->qs;
327 	struct repo_dir *repo_dir = t->repo_dir;
328 	char *in_repo_path = NULL, *repo_path = NULL, *file_path = NULL;
329 	int chk_next = 0, chk_multi = 0;
330 
331 	TAILQ_INIT(&refs);
332 
333 	if (qs->file != NULL && strlen(qs->file) > 0)
334 		if (asprintf(&file_path, "%s/%s", qs->folder ? qs->folder : "",
335 		    qs->file) == -1)
336 			return got_error_from_errno("asprintf");
337 
338 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
339 	    repo_dir->name) == -1) {
340 		error = got_error_from_errno("asprintf");
341 		goto done;
342 	}
343 
344 	if (qs->commit) {
345 		error = got_repo_match_object_id_prefix(&id, qs->commit,
346 		    GOT_OBJ_TYPE_COMMIT, repo);
347 		if (error)
348 			goto done;
349 	} else {
350 		error = got_ref_open(&ref, repo, qs->headref, 0);
351 		if (error)
352 			goto done;
353 
354 		error = got_ref_resolve(&id, repo, ref);
355 		if (error)
356 			goto done;
357 	}
358 
359 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
360 	if (error)
361 		goto done;
362 
363 	error = got_ref_list(&refs, repo, NULL, got_ref_cmp_by_name, NULL);
364 	if (error)
365 		goto done;
366 
367 	if (qs->file != NULL && strlen(qs->file) > 0) {
368 		error = got_commit_graph_open(&graph, file_path, 0);
369 		if (error)
370 			goto done;
371 	} else {
372 		error = got_commit_graph_open(&graph, in_repo_path, 0);
373 		if (error)
374 			goto done;
375 	}
376 
377 	error = got_commit_graph_iter_start(graph, id, repo, NULL, NULL);
378 	if (error)
379 		goto done;
380 
381 	for (;;) {
382 		struct got_object_id next_id;
383 
384 		error = got_commit_graph_iter_next(&next_id, graph, repo, NULL,
385 		    NULL);
386 		if (error) {
387 			if (error->code == GOT_ERR_ITER_COMPLETED)
388 				error = NULL;
389 			goto done;
390 		}
391 
392 		error = got_object_open_as_commit(&commit, repo, &next_id);
393 		if (error)
394 			goto done;
395 
396 		error = got_init_repo_commit(&repo_commit);
397 		if (error)
398 			goto done;
399 
400 		error = got_get_repo_commit(c, repo_commit, commit,
401 		    &refs, &next_id);
402 		if (error) {
403 			gotweb_free_repo_commit(repo_commit);
404 			goto done;
405 		}
406 
407 		TAILQ_INSERT_TAIL(&t->repo_commits, repo_commit, entry);
408 
409 		if (!chk_multi || limit != 1 ||
410 		    srv->max_commits_display == 1) {
411 			chk_multi = 1;
412 
413 			/*
414 			 * check for one more commit before breaking,
415 			 * so we know whether to navigate through briefs
416 			 * commits and summary
417 			 */
418 			if (chk_next && (qs->action == BRIEFS ||
419 			    qs->action == COMMITS || qs->action == SUMMARY)) {
420 				t->more_id = strdup(repo_commit->commit_id);
421 				if (t->more_id == NULL) {
422 					error = got_error_from_errno("strdup");
423 					goto done;
424 				}
425 				got_object_commit_close(commit);
426 				commit = NULL;
427 				TAILQ_REMOVE(&t->repo_commits, repo_commit,
428 				    entry);
429 				gotweb_free_repo_commit(repo_commit);
430 				goto done;
431 			}
432 		}
433 		if (error || (limit && --limit == 0)) {
434 			if (qs->file != NULL && *qs->file != '\0')
435 				if (chk_multi == 0)
436 					break;
437 			chk_next = 1;
438 		}
439 		if (commit) {
440 			got_object_commit_close(commit);
441 			commit = NULL;
442 		}
443 	}
444  done:
445 	if (ref)
446 		got_ref_close(ref);
447 	if (commit)
448 		got_object_commit_close(commit);
449 	if (graph)
450 		got_commit_graph_close(graph);
451 	got_ref_list_free(&refs);
452 	free(in_repo_path);
453 	free(file_path);
454 	free(repo_path);
455 	free(id);
456 	return error;
457 }
458 
459 const struct got_error *
460 got_get_repo_tags(struct request *c, int limit)
461 {
462 	const struct got_error *error = NULL;
463 	struct got_object_id *id = NULL;
464 	struct got_commit_object *commit = NULL;
465 	struct got_reflist_head refs;
466 	struct got_reference *ref;
467 	struct got_reflist_entry *re;
468 	struct server *srv = c->srv;
469 	struct transport *t = c->t;
470 	struct got_repository *repo = t->repo;
471 	struct querystring *qs = t->qs;
472 	struct repo_dir *repo_dir = t->repo_dir;
473 	struct got_tag_object *tag = NULL;
474 	struct repo_tag *rt = NULL, *trt = NULL;
475 	char *in_repo_path = NULL, *repo_path = NULL, *id_str = NULL;
476 	char *tag_commit = NULL, *tag_commit0 = NULL;
477 	char *commit_msg = NULL, *commit_msg0 = NULL;
478 	int chk_next = 0, chk_multi = 1, commit_found = 0, c_cnt = 0;
479 
480 	TAILQ_INIT(&refs);
481 
482 	if (asprintf(&repo_path, "%s/%s", srv->repos_path,
483 	    repo_dir->name) == -1)
484 		return got_error_from_errno("asprintf");
485 
486 	if (qs->commit == NULL && (qs->action == TAGS || qs->action == RSS)) {
487 		error = got_ref_open(&ref, repo, qs->headref, 0);
488 		if (error)
489 			goto err;
490 		error = got_ref_resolve(&id, repo, ref);
491 		got_ref_close(ref);
492 		if (error)
493 			goto err;
494 	} else if (qs->commit == NULL && qs->action == TAG) {
495 		error = got_error_msg(GOT_ERR_EOF, "commit id missing");
496 		goto err;
497 	} else {
498 		error = got_repo_match_object_id_prefix(&id, qs->commit,
499 		    GOT_OBJ_TYPE_COMMIT, repo);
500 		if (error)
501 			goto err;
502 	}
503 
504 	if (qs->action != SUMMARY && qs->action != TAGS) {
505 		error = got_object_open_as_commit(&commit, repo, id);
506 		if (error)
507 			goto err;
508 		error = got_object_commit_get_logmsg(&commit_msg0, commit);
509 		if (error)
510 			goto err;
511 		if (commit) {
512 			got_object_commit_close(commit);
513 			commit = NULL;
514 		}
515 	}
516 
517 	error = got_repo_map_path(&in_repo_path, repo, repo_path);
518 	if (error)
519 		goto err;
520 
521 	error = got_ref_list(&refs, repo, "refs/tags", got_ref_cmp_tags,
522 	   repo);
523 	if (error)
524 		goto err;
525 
526 	if (limit == 1)
527 		chk_multi = 0;
528 
529 	/*
530 	 * XXX: again, see previous message about caching
531 	 */
532 
533 	TAILQ_FOREACH(re, &refs, entry) {
534 		struct repo_tag *new_repo_tag = NULL;
535 		error = got_init_repo_tag(&new_repo_tag);
536 		if (error)
537 			goto err;
538 
539 		TAILQ_INSERT_TAIL(&t->repo_tags, new_repo_tag, entry);
540 
541 		new_repo_tag->tag_name = strdup(got_ref_get_name(re->ref));
542 		if (new_repo_tag->tag_name == NULL) {
543 			error = got_error_from_errno("strdup");
544 			goto err;
545 		}
546 
547 		free(id);
548 		id = NULL;
549 
550 		free(id_str);
551 		id_str = NULL;
552 
553 		error = got_ref_resolve(&id, repo, re->ref);
554 		if (error)
555 			goto done;
556 
557 		if (tag)
558 			got_object_tag_close(tag);
559 		error = got_object_open_as_tag(&tag, repo, id);
560 		if (error) {
561 			if (error->code != GOT_ERR_OBJ_TYPE)
562 				goto done;
563 			/* "lightweight" tag */
564 			error = got_object_open_as_commit(&commit, repo, id);
565 			if (error)
566 				goto done;
567 			new_repo_tag->tagger =
568 			    strdup(got_object_commit_get_committer(commit));
569 			if (new_repo_tag->tagger == NULL) {
570 				error = got_error_from_errno("strdup");
571 				goto err;
572 			}
573 			new_repo_tag->tagger_time =
574 			    got_object_commit_get_committer_time(commit);
575 			error = got_object_id_str(&id_str, id);
576 			if (error)
577 				goto err;
578 		} else {
579 			new_repo_tag->tagger =
580 			    strdup(got_object_tag_get_tagger(tag));
581 			if (new_repo_tag->tagger == NULL) {
582 				error = got_error_from_errno("strdup");
583 				goto err;
584 			}
585 			new_repo_tag->tagger_time =
586 			    got_object_tag_get_tagger_time(tag);
587 			error = got_object_id_str(&id_str,
588 			    got_object_tag_get_object_id(tag));
589 			if (error)
590 				goto err;
591 		}
592 
593 		new_repo_tag->commit_id = strdup(id_str);
594 		if (new_repo_tag->commit_id == NULL)
595 			goto err;
596 
597 		if (commit_found == 0 && qs->commit != NULL &&
598 		    strncmp(id_str, qs->commit, strlen(id_str)) != 0)
599 			continue;
600 		else
601 			commit_found = 1;
602 
603 		t->tag_count++;
604 
605 		/*
606 		 * check for one more commit before breaking,
607 		 * so we know whether to navigate through briefs
608 		 * commits and summary
609 		 */
610 		if (chk_next) {
611 			t->next_id = strdup(new_repo_tag->commit_id);
612 			if (t->next_id == NULL) {
613 				error = got_error_from_errno("strdup");
614 				goto err;
615 			}
616 			if (commit) {
617 				got_object_commit_close(commit);
618 				commit = NULL;
619 			}
620 			TAILQ_REMOVE(&t->repo_tags, new_repo_tag, entry);
621 			gotweb_free_repo_tag(new_repo_tag);
622 			goto done;
623 		}
624 
625 		if (commit) {
626 			error = got_object_commit_get_logmsg(&tag_commit0,
627 			    commit);
628 			if (error)
629 				goto err;
630 			got_object_commit_close(commit);
631 			commit = NULL;
632 		} else {
633 			tag_commit0 = strdup(got_object_tag_get_message(tag));
634 			if (tag_commit0 == NULL) {
635 				error = got_error_from_errno("strdup");
636 				goto err;
637 			}
638 		}
639 
640 		tag_commit = tag_commit0;
641 		while (*tag_commit == '\n')
642 			tag_commit++;
643 		new_repo_tag->tag_commit = strdup(tag_commit);
644 		if (new_repo_tag->tag_commit == NULL) {
645 			error = got_error_from_errno("strdup");
646 			free(tag_commit0);
647 			goto err;
648 		}
649 		free(tag_commit0);
650 
651 		if (qs->action != SUMMARY && qs->action != TAGS) {
652 			commit_msg = commit_msg0;
653 			while (*commit_msg == '\n')
654 				commit_msg++;
655 
656 			new_repo_tag->commit_msg = strdup(commit_msg);
657 			if (new_repo_tag->commit_msg == NULL) {
658 				error = got_error_from_errno("strdup");
659 				goto err;
660 			}
661 		}
662 
663 		if (limit && --limit == 0) {
664 			if (chk_multi == 0)
665 				break;
666 			chk_next = 1;
667 		}
668 	}
669 
670  done:
671 	/*
672 	 * we have tailq populated, so find previous commit id
673 	 * for navigation through briefs and commits
674 	 */
675 	if (t->tag_count == 0) {
676 		TAILQ_FOREACH_SAFE(rt, &t->repo_tags, entry, trt) {
677 			TAILQ_REMOVE(&t->repo_tags, rt, entry);
678 			gotweb_free_repo_tag(rt);
679 		}
680 	}
681 	if (t->tag_count > 0 && t->prev_id == NULL && qs->commit != NULL) {
682 		commit_found = 0;
683 		TAILQ_FOREACH_REVERSE(rt, &t->repo_tags, repo_tags_head,
684 		    entry) {
685 			if (commit_found == 0 && rt->commit_id != NULL &&
686 			    strcmp(qs->commit, rt->commit_id) != 0) {
687 				continue;
688 			} else
689 				commit_found = 1;
690 			if (c_cnt == srv->max_commits_display ||
691 			    rt == TAILQ_FIRST(&t->repo_tags)) {
692 				t->prev_id = strdup(rt->commit_id);
693 				if (t->prev_id == NULL)
694 					error = got_error_from_errno("strdup");
695 				break;
696 			}
697 			c_cnt++;
698 		}
699 	}
700  err:
701 	if (commit)
702 		got_object_commit_close(commit);
703 	if (tag)
704 		got_object_tag_close(tag);
705 	got_ref_list_free(&refs);
706 	free(commit_msg0);
707 	free(in_repo_path);
708 	free(repo_path);
709 	free(id);
710 	free(id_str);
711 	return error;
712 }
713 
714 int
715 got_output_repo_tree(struct request *c,
716     int (*cb)(struct template *, struct got_tree_entry *))
717 {
718 	const struct got_error *error = NULL;
719 	struct transport *t = c->t;
720 	struct got_commit_object *commit = NULL;
721 	struct got_repository *repo = t->repo;
722 	struct querystring *qs = t->qs;
723 	struct repo_commit *rc = NULL;
724 	struct got_object_id *tree_id = NULL, *commit_id = NULL;
725 	struct got_reflist_head refs;
726 	struct got_tree_object *tree = NULL;
727 	struct got_tree_entry *te;
728 	struct repo_dir *repo_dir = t->repo_dir;
729 	char *escaped_name = NULL, *path = NULL;
730 	int nentries, i;
731 
732 	TAILQ_INIT(&refs);
733 
734 	rc = TAILQ_FIRST(&t->repo_commits);
735 
736 	if (qs->folder != NULL) {
737 		path = strdup(qs->folder);
738 		if (path == NULL) {
739 			error = got_error_from_errno("strdup");
740 			goto done;
741 		}
742 	} else {
743 		error = got_repo_map_path(&path, repo, repo_dir->path);
744 		if (error)
745 			goto done;
746 	}
747 
748 	error = got_repo_match_object_id(&commit_id, NULL, rc->commit_id,
749 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
750 	if (error)
751 		goto done;
752 
753 	error = got_object_open_as_commit(&commit, repo, commit_id);
754 	if (error)
755 		goto done;
756 
757 	error = got_object_id_by_path(&tree_id, repo, commit, path);
758 	if (error)
759 		goto done;
760 
761 	error = got_object_open_as_tree(&tree, repo, tree_id);
762 	if (error)
763 		goto done;
764 
765 	nentries = got_object_tree_get_nentries(tree);
766 
767 	for (i = 0; i < nentries; i++) {
768 		te = got_object_tree_get_entry(tree, i);
769 		if (cb(c->tp, te) == -1) {
770 			error = got_error(GOT_ERR_CANCELLED);
771 			break;
772 		}
773 	}
774  done:
775 	free(escaped_name);
776 	free(path);
777 	got_ref_list_free(&refs);
778 	if (commit)
779 		got_object_commit_close(commit);
780 	if (tree)
781 		got_object_tree_close(tree);
782 	free(commit_id);
783 	free(tree_id);
784 	if (error) {
785 		if (error->code != GOT_ERR_CANCELLED)
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 			err = got_error(GOT_ERR_CANCELLED);
898 			break;
899 		}
900 	}
901 
902 	free(line);
903 
904 	if (err) {
905 		if (err->code != GOT_ERR_CANCELLED)
906 			log_warnx("%s: got_object_blob_getline failed: %s",
907 			    __func__, err->msg);
908 		return -1;
909 	}
910 	return 0;
911 }
912 
913 struct blame_cb_args {
914 	struct blame_line *lines;
915 	int nlines;
916 	int nlines_prec;
917 	int lineno_cur;
918 	off_t *line_offsets;
919 	FILE *f;
920 	struct got_repository *repo;
921 	struct request *c;
922 	got_render_blame_line_cb cb;
923 };
924 
925 static const struct got_error *
926 got_gotweb_blame_cb(void *arg, int nlines, int lineno,
927     struct got_commit_object *commit, struct got_object_id *id)
928 {
929 	const struct got_error *err = NULL;
930 	struct blame_cb_args *a = arg;
931 	struct blame_line *bline;
932 	struct request *c = a->c;
933 	char *line = NULL;
934 	size_t linesize = 0;
935 	off_t offset;
936 	struct tm tm;
937 	time_t committer_time;
938 
939 	if (nlines != a->nlines ||
940 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
941 		return got_error(GOT_ERR_RANGE);
942 
943 	if (lineno == -1)
944 		return NULL; /* no change in this commit */
945 
946 	/* Annotate this line. */
947 	bline = &a->lines[lineno - 1];
948 	if (bline->annotated)
949 		return NULL;
950 	err = got_object_id_str(&bline->id_str, id);
951 	if (err)
952 		return err;
953 
954 	bline->committer = strdup(got_object_commit_get_committer(commit));
955 	if (bline->committer == NULL) {
956 		err = got_error_from_errno("strdup");
957 		goto done;
958 	}
959 
960 	committer_time = got_object_commit_get_committer_time(commit);
961 	if (gmtime_r(&committer_time, &tm) == NULL)
962 		return got_error_from_errno("gmtime_r");
963 	if (strftime(bline->datebuf, sizeof(bline->datebuf), "%G-%m-%d",
964 	    &tm) == 0) {
965 		err = got_error(GOT_ERR_NO_SPACE);
966 		goto done;
967 	}
968 	bline->annotated = 1;
969 
970 	/* Print lines annotated so far. */
971 	bline = &a->lines[a->lineno_cur - 1];
972 	if (!bline->annotated)
973 		goto done;
974 
975 	offset = a->line_offsets[a->lineno_cur - 1];
976 	if (fseeko(a->f, offset, SEEK_SET) == -1) {
977 		err = got_error_from_errno("fseeko");
978 		goto done;
979 	}
980 
981 	while (a->lineno_cur <= a->nlines && bline->annotated) {
982 		if (getline(&line, &linesize, a->f) == -1) {
983 			if (ferror(a->f))
984 				err = got_error_from_errno("getline");
985 			break;
986 		}
987 
988 		if (a->cb(c->tp, line, bline, a->nlines_prec,
989 		    a->lineno_cur) == -1) {
990 			err = got_error(GOT_ERR_CANCELLED);
991 			break;
992 		}
993 
994 		a->lineno_cur++;
995 		bline = &a->lines[a->lineno_cur - 1];
996 	}
997  done:
998 	free(line);
999 	return err;
1000 }
1001 
1002 const struct got_error *
1003 got_output_file_blame(struct request *c, got_render_blame_line_cb cb)
1004 {
1005 	const struct got_error *error = NULL;
1006 	struct transport *t = c->t;
1007 	struct got_repository *repo = t->repo;
1008 	struct querystring *qs = c->t->qs;
1009 	struct got_object_id *obj_id = NULL, *commit_id = NULL;
1010 	struct got_commit_object *commit = NULL;
1011 	struct got_reflist_head refs;
1012 	struct got_blob_object *blob = NULL;
1013 	char *path = NULL, *in_repo_path = NULL;
1014 	struct blame_cb_args bca;
1015 	int i, obj_type, blobfd = -1, fd1 = -1, fd2 = -1;
1016 	off_t filesize;
1017 	FILE *f1 = NULL, *f2 = NULL;
1018 
1019 	TAILQ_INIT(&refs);
1020 	bca.f = NULL;
1021 	bca.lines = NULL;
1022 	bca.cb = cb;
1023 
1024 	if (asprintf(&path, "%s%s%s", qs->folder ? qs->folder : "",
1025 	    qs->folder ? "/" : "", qs->file) == -1) {
1026 		error = got_error_from_errno("asprintf");
1027 		goto done;
1028 	}
1029 
1030 	error = got_repo_map_path(&in_repo_path, repo, path);
1031 	if (error)
1032 		goto done;
1033 
1034 	error = got_repo_match_object_id(&commit_id, NULL, qs->commit,
1035 	    GOT_OBJ_TYPE_COMMIT, &refs, repo);
1036 	if (error)
1037 		goto done;
1038 
1039 	error = got_object_open_as_commit(&commit, repo, commit_id);
1040 	if (error)
1041 		goto done;
1042 
1043 	error = got_object_id_by_path(&obj_id, repo, commit, in_repo_path);
1044 	if (error)
1045 		goto done;
1046 
1047 	error = got_object_get_type(&obj_type, repo, obj_id);
1048 	if (error)
1049 		goto done;
1050 
1051 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
1052 		error = got_error(GOT_ERR_OBJ_TYPE);
1053 		goto done;
1054 	}
1055 
1056 	error = got_gotweb_openfile(&bca.f, &c->priv_fd[BLAME_FD_1]);
1057 	if (error)
1058 		goto done;
1059 
1060 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_2], &blobfd);
1061 	if (error)
1062 		goto done;
1063 
1064 	error = got_object_open_as_blob(&blob, repo, obj_id, BUF, blobfd);
1065 	if (error)
1066 		goto done;
1067 
1068 	error = got_object_blob_dump_to_file(&filesize, &bca.nlines,
1069 	    &bca.line_offsets, bca.f, blob);
1070 	if (error || bca.nlines == 0)
1071 		goto done;
1072 
1073 	/* Don't include \n at EOF in the blame line count. */
1074 	if (bca.line_offsets[bca.nlines - 1] == filesize)
1075 		bca.nlines--;
1076 
1077 	bca.lines = calloc(bca.nlines, sizeof(*bca.lines));
1078 	if (bca.lines == NULL) {
1079 		error = got_error_from_errno("calloc");
1080 		goto done;
1081 	}
1082 	bca.lineno_cur = 1;
1083 	bca.nlines_prec = 0;
1084 	i = bca.nlines;
1085 	while (i > 0) {
1086 		i /= 10;
1087 		bca.nlines_prec++;
1088 	}
1089 	bca.repo = repo;
1090 	bca.c = c;
1091 
1092 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_3], &fd1);
1093 	if (error)
1094 		goto done;
1095 
1096 	error = got_gotweb_dupfd(&c->priv_fd[BLAME_FD_4], &fd2);
1097 	if (error)
1098 		goto done;
1099 
1100 	error = got_gotweb_openfile(&f1, &c->priv_fd[BLAME_FD_5]);
1101 	if (error)
1102 		goto done;
1103 
1104 	error = got_gotweb_openfile(&f2, &c->priv_fd[BLAME_FD_6]);
1105 	if (error)
1106 		goto done;
1107 
1108 	error = got_blame(in_repo_path, commit_id, repo,
1109 	    GOT_DIFF_ALGORITHM_MYERS, got_gotweb_blame_cb, &bca, NULL, NULL,
1110 	    fd1, fd2, f1, f2);
1111 
1112  done:
1113 	if (bca.lines) {
1114 		free(bca.line_offsets);
1115 		for (i = 0; i < bca.nlines; i++) {
1116 			struct blame_line *bline = &bca.lines[i];
1117 			free(bline->id_str);
1118 			free(bline->committer);
1119 		}
1120 	}
1121 	free(bca.lines);
1122 	if (blobfd != -1 && close(blobfd) == -1 && error == NULL)
1123 		error = got_error_from_errno("close");
1124 	if (fd1 != -1 && close(fd1) == -1 && error == NULL)
1125 		error = got_error_from_errno("close");
1126 	if (fd2 != -1 && close(fd2) == -1 && error == NULL)
1127 		error = got_error_from_errno("close");
1128 	if (bca.f) {
1129 		const struct got_error *bca_err = got_gotweb_closefile(bca.f);
1130 		if (error == NULL)
1131 			error = bca_err;
1132 	}
1133 	if (f1) {
1134 		const struct got_error *f1_err = got_gotweb_closefile(f1);
1135 		if (error == NULL)
1136 			error = f1_err;
1137 	}
1138 	if (f2) {
1139 		const struct got_error *f2_err = got_gotweb_closefile(f2);
1140 		if (error == NULL)
1141 			error = f2_err;
1142 	}
1143 	if (commit)
1144 		got_object_commit_close(commit);
1145 	if (blob)
1146 		got_object_blob_close(blob);
1147 	free(in_repo_path);
1148 	free(commit_id);
1149 	free(obj_id);
1150 	free(path);
1151 	got_ref_list_free(&refs);
1152 	return error;
1153 }
1154 
1155 const struct got_error *
1156 got_open_diff_for_output(FILE **fp, struct request *c)
1157 {
1158 	const struct got_error *error = NULL;
1159 	struct transport *t = c->t;
1160 	struct got_repository *repo = t->repo;
1161 	struct repo_commit *rc = NULL;
1162 	struct got_object_id *id1 = NULL, *id2 = NULL;
1163 	struct got_reflist_head refs;
1164 	FILE *f1 = NULL, *f2 = NULL, *f3 = NULL;
1165 	int obj_type, fd1 = -1, fd2 = -1;
1166 
1167 	*fp = NULL;
1168 
1169 	TAILQ_INIT(&refs);
1170 
1171 	error = got_gotweb_openfile(&f1, &c->priv_fd[DIFF_FD_1]);
1172 	if (error)
1173 		return error;
1174 
1175 	error = got_gotweb_openfile(&f2, &c->priv_fd[DIFF_FD_2]);
1176 	if (error)
1177 		return error;
1178 
1179 	error = got_gotweb_openfile(&f3, &c->priv_fd[DIFF_FD_3]);
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], &fd1);
1204 	if (error)
1205 		goto done;
1206 
1207 	error = got_gotweb_dupfd(&c->priv_fd[DIFF_FD_5], &fd2);
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, fd1, fd2,
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, fd1, fd2,
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, fd1,
1224 		    fd2, 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(f3, 0, SEEK_SET) == -1) {
1234 		error = got_ferror(f3, GOT_ERR_IO);
1235 		goto done;
1236 	}
1237 
1238 	*fp = f3;
1239 
1240  done:
1241 	if (fd1 != -1 && close(fd1) == -1 && error == NULL)
1242 		error = got_error_from_errno("close");
1243 	if (fd2 != -1 && close(fd2) == -1 && error == NULL)
1244 		error = got_error_from_errno("close");
1245 	if (f1) {
1246 		const struct got_error *f1_err = got_gotweb_closefile(f1);
1247 		if (error == NULL)
1248 			error = f1_err;
1249 	}
1250 	if (f2) {
1251 		const struct got_error *f2_err = got_gotweb_closefile(f2);
1252 		if (error == NULL)
1253 			error = f2_err;
1254 	}
1255 	if (error && f3) {
1256 		got_gotweb_closefile(f3);
1257 		*fp = NULL;
1258 	}
1259 	got_ref_list_free(&refs);
1260 	free(id1);
1261 	free(id2);
1262 	return error;
1263 }
1264 
1265 static const struct got_error *
1266 got_init_repo_commit(struct repo_commit **rc)
1267 {
1268 	*rc = calloc(1, sizeof(**rc));
1269 	if (*rc == NULL)
1270 		return got_error_from_errno2(__func__, "calloc");
1271 
1272 	(*rc)->path = NULL;
1273 	(*rc)->refs_str = NULL;
1274 	(*rc)->commit_id = NULL;
1275 	(*rc)->committer = NULL;
1276 	(*rc)->author = NULL;
1277 	(*rc)->parent_id = NULL;
1278 	(*rc)->tree_id = NULL;
1279 	(*rc)->commit_msg = NULL;
1280 
1281 	return NULL;
1282 }
1283 
1284 static const struct got_error *
1285 got_init_repo_tag(struct repo_tag **rt)
1286 {
1287 	*rt = calloc(1, sizeof(**rt));
1288 	if (*rt == NULL)
1289 		return got_error_from_errno2(__func__, "calloc");
1290 
1291 	(*rt)->commit_id = NULL;
1292 	(*rt)->tag_name = NULL;
1293 	(*rt)->tag_commit = NULL;
1294 	(*rt)->commit_msg = NULL;
1295 	(*rt)->tagger = NULL;
1296 
1297 	return NULL;
1298 }