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