1 /*
2  * Copyright (c) 2022 Omar Polo <op@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  *
16  * Apply patches.
17  *
18  * Things that are still missing:
19  *     + "No final newline" handling
20  *
21  * Things that we may want to support:
22  *     + support indented patches?
23  *     + support other kinds of patches?
24  */
25 
26 #include <sys/types.h>
27 #include <sys/queue.h>
28 #include <sys/socket.h>
29 #include <sys/uio.h>
30 
31 #include <errno.h>
32 #include <limits.h>
33 #include <stdint.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <unistd.h>
38 #include <imsg.h>
39 
40 #include "got_error.h"
41 #include "got_object.h"
42 #include "got_path.h"
43 #include "got_reference.h"
44 #include "got_cancel.h"
45 #include "got_worktree.h"
46 #include "got_opentemp.h"
47 #include "got_patch.h"
48 
49 #include "got_lib_delta.h"
50 #include "got_lib_object.h"
51 #include "got_lib_privsep.h"
52 
53 #define MIN(a, b) ((a) < (b) ? (a) : (b))
54 
55 struct got_patch_hunk {
56 	STAILQ_ENTRY(got_patch_hunk) entries;
57 	long	old_from;
58 	long	old_lines;
59 	long	new_from;
60 	long	new_lines;
61 	size_t	len;
62 	size_t	cap;
63 	char	**lines;
64 };
65 
66 struct got_patch {
67 	char	*old;
68 	char	*new;
69 	STAILQ_HEAD(, got_patch_hunk) head;
70 };
71 
72 static const struct got_error *
73 send_patch(struct imsgbuf *ibuf, int fd)
74 {
75 	const struct got_error *err = NULL;
76 
77 	if (imsg_compose(ibuf, GOT_IMSG_PATCH_FILE, 0, 0, fd,
78 	    NULL, 0) == -1) {
79 		err = got_error_from_errno(
80 		    "imsg_compose GOT_IMSG_PATCH_FILE");
81 		close(fd);
82 		return err;
83 	}
84 
85 	if (imsg_flush(ibuf) == -1) {
86 		err = got_error_from_errno("imsg_flush");
87 		imsg_clear(ibuf);
88 	}
89 
90 	return err;
91 }
92 
93 static void
94 patch_free(struct got_patch *p)
95 {
96 	struct got_patch_hunk *h;
97 	size_t i;
98 
99 	while (!STAILQ_EMPTY(&p->head)) {
100 		h = STAILQ_FIRST(&p->head);
101 		STAILQ_REMOVE_HEAD(&p->head, entries);
102 
103 		for (i = 0; i < h->len; ++i)
104 			free(h->lines[i]);
105 		free(h->lines);
106 		free(h);
107 	}
108 
109 	free(p->new);
110 	free(p->old);
111 }
112 
113 static const struct got_error *
114 pushline(struct got_patch_hunk *h, const char *line)
115 {
116 	void 	*t;
117 	size_t	 newcap;
118 
119 	if (h->len == h->cap) {
120 		if ((newcap = h->cap * 1.5) == 0)
121 			newcap = 16;
122 		t = recallocarray(h->lines, h->cap, newcap,
123 		    sizeof(h->lines[0]));
124 		if (t == NULL)
125 			return got_error_from_errno("recallocarray");
126 		h->lines = t;
127 		h->cap = newcap;
128 	}
129 
130 	if ((t = strdup(line)) == NULL)
131 		return got_error_from_errno("strdup");
132 
133 	h->lines[h->len++] = t;
134 	return NULL;
135 }
136 
137 static const struct got_error *
138 recv_patch(struct imsgbuf *ibuf, int *done, struct got_patch *p)
139 {
140 	const struct got_error *err = NULL;
141 	struct imsg imsg;
142 	struct got_imsg_patch_hunk hdr;
143 	struct got_imsg_patch patch;
144 	struct got_patch_hunk *h = NULL;
145 	size_t datalen;
146 
147 	memset(p, 0, sizeof(*p));
148 	STAILQ_INIT(&p->head);
149 
150 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
151 	if (err)
152 		return err;
153 	if (imsg.hdr.type == GOT_IMSG_PATCH_EOF) {
154 		*done = 1;
155 		goto done;
156 	}
157 	if (imsg.hdr.type != GOT_IMSG_PATCH) {
158 		err = got_error(GOT_ERR_PRIVSEP_MSG);
159 		goto done;
160 	}
161 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
162 	if (datalen != sizeof(patch)) {
163 		err = got_error(GOT_ERR_PRIVSEP_LEN);
164 		goto done;
165 	}
166 	memcpy(&patch, imsg.data, sizeof(patch));
167 	if (*patch.old != '\0' && (p->old = strdup(patch.old)) == NULL) {
168 		err = got_error_from_errno("strdup");
169 		goto done;
170 	}
171 	if (*patch.new != '\0' && (p->new = strdup(patch.new)) == NULL) {
172 		err = got_error_from_errno("strdup");
173 		goto done;
174 	}
175 	if (p->old == NULL && p->new == NULL) {
176 		err = got_error(GOT_ERR_PATCH_MALFORMED);
177 		goto done;
178 	}
179 
180 	imsg_free(&imsg);
181 
182 	for (;;) {
183 		char *t;
184 
185 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
186 		if (err)
187 			return err;
188 
189 		switch (imsg.hdr.type) {
190 		case GOT_IMSG_PATCH_DONE:
191 			goto done;
192 		case GOT_IMSG_PATCH_HUNK:
193 			datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
194 			if (datalen != sizeof(hdr)) {
195 				err = got_error(GOT_ERR_PRIVSEP_LEN);
196 				goto done;
197 			}
198 			memcpy(&hdr, imsg.data, sizeof(hdr));
199 			if ((h = calloc(1, sizeof(*h))) == NULL) {
200 				err = got_error_from_errno("calloc");
201 				goto done;
202 			}
203 			h->old_from = hdr.oldfrom;
204 			h->old_lines = hdr.oldlines;
205 			h->new_from = hdr.newfrom;
206 			h->new_lines = hdr.newlines;
207 			STAILQ_INSERT_TAIL(&p->head, h, entries);
208 			break;
209 		case GOT_IMSG_PATCH_LINE:
210 			if (h == NULL) {
211 				err = got_error(GOT_ERR_PRIVSEP_MSG);
212 				goto done;
213 			}
214 			datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
215 			t = imsg.data;
216 			/* at least one char plus newline */
217 			if (datalen < 2 || t[datalen-1] != '\0') {
218 				err = got_error(GOT_ERR_PRIVSEP_MSG);
219 				goto done;
220 			}
221 			if (*t != ' ' && *t != '-' && *t != '+') {
222 				err = got_error(GOT_ERR_PRIVSEP_MSG);
223 				goto done;
224 			}
225 			err = pushline(h, t);
226 			if (err)
227 				goto done;
228 			break;
229 		default:
230 			err = got_error(GOT_ERR_PRIVSEP_MSG);
231 			goto done;
232 		}
233 
234 		imsg_free(&imsg);
235 	}
236 
237 done:
238 	imsg_free(&imsg);
239 	return err;
240 }
241 
242 /*
243  * Copy data from orig starting at copypos until pos into tmp.
244  * If pos is -1, copy until EOF.
245  */
246 static const struct got_error *
247 copy(FILE *tmp, FILE *orig, off_t copypos, off_t pos)
248 {
249 	char buf[BUFSIZ];
250 	size_t len, r, w;
251 
252 	if (fseek(orig, copypos, SEEK_SET) == -1)
253 		return got_error_from_errno("fseek");
254 
255 	while (pos == -1 || copypos < pos) {
256 		len = sizeof(buf);
257 		if (pos > 0)
258 			len = MIN(len, (size_t)pos - copypos);
259 		r = fread(buf, 1, len, orig);
260 		if (r != len && ferror(orig))
261 			return got_error_from_errno("fread");
262 		w = fwrite(buf, 1, r, tmp);
263 		if (w != r)
264 			return got_error_from_errno("fwrite");
265 		copypos += len;
266 		if (r != len && feof(orig)) {
267 			if (pos == -1)
268 				return NULL;
269 			return got_error(GOT_ERR_PATCH_DONT_APPLY);
270 		}
271 	}
272 	return NULL;
273 }
274 
275 static const struct got_error *
276 locate_hunk(FILE *orig, struct got_patch_hunk *h, long *lineno)
277 {
278 	const struct got_error *err = NULL;
279 	char *line = NULL;
280 	char mode = *h->lines[0];
281 	size_t linesize = 0;
282 	ssize_t linelen;
283 	off_t match = -1;
284 	long match_lineno = -1;
285 
286 	for (;;) {
287 		linelen = getline(&line, &linesize, orig);
288 		if (linelen == -1) {
289 			if (ferror(orig))
290 				err = got_error_from_errno("getline");
291 			else if (match == -1)
292 				err = got_error(GOT_ERR_PATCH_DONT_APPLY);
293 			break;
294 		}
295 		(*lineno)++;
296 
297 		if ((mode == ' ' && !strcmp(h->lines[0]+1, line)) ||
298 		    (mode == '-' && !strcmp(h->lines[0]+1, line)) ||
299 		    (mode == '+' && *lineno == h->old_from)) {
300 			match = ftello(orig);
301 			if (match == -1) {
302 				err = got_error_from_errno("ftello");
303 				break;
304 			}
305 			match -= linelen;
306 			match_lineno = (*lineno)-1;
307 		}
308 
309 		if (*lineno >= h->old_from && match != -1)
310 			break;
311 	}
312 
313 	if (err == NULL) {
314 		*lineno = match_lineno;
315 		if (fseek(orig, match, SEEK_SET) == -1)
316 			err = got_error_from_errno("fseek");
317 	}
318 
319 	free(line);
320 	return err;
321 }
322 
323 static const struct got_error *
324 test_hunk(FILE *orig, struct got_patch_hunk *h)
325 {
326 	const struct got_error *err = NULL;
327 	char *line = NULL;
328 	size_t linesize = 0, i = 0;
329 	ssize_t linelen;
330 
331 	for (i = 0; i < h->len; ++i) {
332 		switch (*h->lines[i]) {
333 		case '+':
334 			continue;
335 		case ' ':
336 		case '-':
337 			linelen = getline(&line, &linesize, orig);
338 			if (linelen == -1) {
339 				if (ferror(orig))
340 					err = got_error_from_errno("getline");
341 				else
342 					err = got_error(
343 					    GOT_ERR_PATCH_DONT_APPLY);
344 				goto done;
345 			}
346 			if (strcmp(h->lines[i]+1, line)) {
347 				err = got_error(GOT_ERR_PATCH_DONT_APPLY);
348 				goto done;
349 			}
350 			break;
351 		}
352 	}
353 
354 done:
355 	free(line);
356 	return err;
357 }
358 
359 static const struct got_error *
360 apply_hunk(FILE *tmp, struct got_patch_hunk *h, long *lineno)
361 {
362 	size_t i = 0;
363 
364 	for (i = 0; i < h->len; ++i) {
365 		switch (*h->lines[i]) {
366 		case ' ':
367 			if (fprintf(tmp, "%s", h->lines[i]+1) < 0)
368 				return got_error_from_errno("fprintf");
369 			/* fallthrough */
370 		case '-':
371 			(*lineno)++;
372 			break;
373 		case '+':
374 			if (fprintf(tmp, "%s", h->lines[i]+1) < 0)
375 				return got_error_from_errno("fprintf");
376 			break;
377 		}
378 	}
379 	return NULL;
380 }
381 
382 static const struct got_error *
383 patch_file(struct got_patch *p, const char *path, FILE *tmp)
384 {
385 	const struct got_error *err = NULL;
386 	struct got_patch_hunk *h;
387 	size_t i;
388 	long lineno = 0;
389 	FILE *orig;
390 	off_t copypos, pos;
391 	char *line = NULL;
392 	size_t linesize = 0;
393 	ssize_t linelen;
394 
395 	if (p->old == NULL) {				/* create */
396 		h = STAILQ_FIRST(&p->head);
397 		if (h == NULL || STAILQ_NEXT(h, entries) != NULL)
398 			return got_error(GOT_ERR_PATCH_MALFORMED);
399 		for (i = 0; i < h->len; ++i) {
400 			if (fprintf(tmp, "%s", h->lines[i]+1) < 0)
401 				return got_error_from_errno("fprintf");
402 		}
403 		return err;
404 	}
405 
406 	if ((orig = fopen(path, "r")) == NULL) {
407 		err = got_error_from_errno2("fopen", path);
408 		goto done;
409 	}
410 
411 	copypos = 0;
412 	STAILQ_FOREACH(h, &p->head, entries) {
413 		if (h->lines == NULL)
414 			break;
415 
416 	tryagain:
417 		err = locate_hunk(orig, h, &lineno);
418 		if (err != NULL)
419 			goto done;
420 		if ((pos = ftello(orig)) == -1) {
421 			err = got_error_from_errno("ftello");
422 			goto done;
423 		}
424 		err = copy(tmp, orig, copypos, pos);
425 		if (err != NULL)
426 			goto done;
427 		copypos = pos;
428 
429 		err = test_hunk(orig, h);
430 		if (err != NULL && err->code == GOT_ERR_PATCH_DONT_APPLY) {
431 			/*
432 			 * try to apply the hunk again starting the search
433 			 * after the previous partial match.
434 			 */
435 			if (fseek(orig, pos, SEEK_SET) == -1) {
436 				err = got_error_from_errno("fseek");
437 				goto done;
438 			}
439 			linelen = getline(&line, &linesize, orig);
440 			if (linelen == -1) {
441 				err = got_error_from_errno("getline");
442 				goto done;
443 			}
444 			lineno++;
445 			goto tryagain;
446 		}
447 		if (err != NULL)
448 			goto done;
449 
450 		err = apply_hunk(tmp, h, &lineno);
451 		if (err != NULL)
452 			goto done;
453 		
454 		copypos = ftello(orig);
455 		if (copypos == -1) {
456 			err = got_error_from_errno("ftello");
457 			goto done;
458 		}
459 	}
460 
461 	if (!feof(orig))
462 		err = copy(tmp, orig, copypos, -1);
463 
464 done:
465 	if (orig != NULL)
466 		fclose(orig);
467 	return err;
468 }
469 
470 static const struct got_error *
471 build_pathlist(const char *p, char **path, struct got_pathlist_head *head,
472     struct got_worktree *worktree)
473 {
474 	const struct got_error *err;
475 	struct got_pathlist_entry *pe;
476 
477 	err = got_worktree_resolve_path(path, worktree, p);
478 	if (err == NULL)
479 		err = got_pathlist_insert(&pe, head, *path, NULL);
480 	return err;
481 }
482 
483 static const struct got_error *
484 can_rm(void *arg, unsigned char status, unsigned char staged_status,
485     const char *path, struct got_object_id *blob_id,
486     struct got_object_id *staged_blob_id, struct got_object_id *commit_id,
487     int dirfd, const char *de_name)
488 {
489 	if (status == GOT_STATUS_NONEXISTENT)
490 		return got_error_set_errno(ENOENT, path);
491 	if (status != GOT_STATUS_NO_CHANGE &&
492 	    status != GOT_STATUS_ADD &&
493 	    status != GOT_STATUS_MODIFY &&
494 	    status != GOT_STATUS_MODE_CHANGE)
495 		return got_error_path(path, GOT_ERR_FILE_STATUS);
496 	if (staged_status == GOT_STATUS_DELETE)
497 		return got_error_path(path, GOT_ERR_FILE_STATUS);
498 	return NULL;
499 }
500 
501 static const struct got_error *
502 can_add(void *arg, unsigned char status, unsigned char staged_status,
503     const char *path, struct got_object_id *blob_id,
504     struct got_object_id *staged_blob_id, struct got_object_id *commit_id,
505     int dirfd, const char *de_name)
506 {
507 	if (status != GOT_STATUS_NONEXISTENT)
508 		return got_error_path(path, GOT_ERR_FILE_STATUS);
509 	return NULL;
510 }
511 
512 static const struct got_error *
513 can_edit(void *arg, unsigned char status, unsigned char staged_status,
514     const char *path, struct got_object_id *blob_id,
515     struct got_object_id *staged_blob_id, struct got_object_id *commit_id,
516     int dirfd, const char *de_name)
517 {
518 	if (status == GOT_STATUS_NONEXISTENT)
519 		return got_error_set_errno(ENOENT, path);
520 	if (status != GOT_STATUS_NO_CHANGE &&
521 	    status != GOT_STATUS_ADD &&
522 	    status != GOT_STATUS_MODIFY)
523 		return got_error_path(path, GOT_ERR_FILE_STATUS);
524 	if (staged_status == GOT_STATUS_DELETE)
525 		return got_error_path(path, GOT_ERR_FILE_STATUS);
526 	return NULL;
527 }
528 
529 static const struct got_error *
530 check_file_status(struct got_patch *p, int file_renamed,
531     struct got_worktree *worktree, struct got_repository *repo,
532     struct got_pathlist_head *old, struct got_pathlist_head *new,
533     got_cancel_cb cancel_cb, void *cancel_arg)
534 {
535 	static const struct got_error *err;
536 
537 	if (p->old != NULL && p->new == NULL)
538 		return got_worktree_status(worktree, old, repo, 0,
539 		    can_rm, NULL, cancel_cb, cancel_arg);
540 	else if (file_renamed) {
541 		err = got_worktree_status(worktree, old, repo, 0,
542 		    can_rm, NULL, cancel_cb, cancel_arg);
543 		if (err)
544 			return err;
545 		return got_worktree_status(worktree, new, repo, 0,
546 		    can_add, NULL, cancel_cb, cancel_arg);
547 	} else if (p->old == NULL)
548 		return got_worktree_status(worktree, new, repo, 0,
549 		    can_add, NULL, cancel_cb, cancel_arg);
550 	else
551 		return got_worktree_status(worktree, new, repo, 0,
552 		    can_edit, NULL, cancel_cb, cancel_arg);
553 }
554 
555 static const struct got_error *
556 apply_patch(struct got_worktree *worktree, struct got_repository *repo,
557     struct got_patch *p, got_worktree_delete_cb delete_cb, void *delete_arg,
558     got_worktree_checkout_cb add_cb, void *add_arg, got_cancel_cb cancel_cb,
559     void *cancel_arg)
560 {
561 	const struct got_error *err = NULL;
562 	struct got_pathlist_head oldpaths, newpaths;
563 	int file_renamed = 0;
564 	char *oldpath = NULL, *newpath = NULL;
565 	char *tmppath = NULL, *template = NULL;
566 	FILE *tmp = NULL;
567 
568 	TAILQ_INIT(&oldpaths);
569 	TAILQ_INIT(&newpaths);
570 
571 	err = build_pathlist(p->old != NULL ? p->old : p->new, &oldpath,
572 	    &oldpaths, worktree);
573 	if (err)
574 		goto done;
575 
576 	err = build_pathlist(p->new != NULL ? p->new : p->old, &newpath,
577 	    &newpaths, worktree);
578 	if (err)
579 		goto done;
580 
581 	if (p->old != NULL && p->new != NULL && strcmp(p->old, p->new))
582 		file_renamed = 1;
583 
584 	err = check_file_status(p, file_renamed, worktree, repo, &oldpaths,
585 	    &newpaths, cancel_cb, cancel_arg);
586 	if (err)
587 		goto done;
588 
589 	if (p->old != NULL && p->new == NULL) {
590 		/*
591 		 * special case: delete a file.  don't try to match
592 		 * the lines but just schedule the removal.
593 		 */
594 		err = got_worktree_schedule_delete(worktree, &oldpaths,
595 		    0, NULL, delete_cb, delete_arg, repo, 0, 0);
596 		goto done;
597 	}
598 
599 	if (asprintf(&template, "%s/got-patch",
600 	    got_worktree_get_root_path(worktree)) == -1) {
601 		err = got_error_from_errno(template);
602 		goto done;
603 	}
604 
605 	err = got_opentemp_named(&tmppath, &tmp, template);
606 	if (err)
607 		goto done;
608 	err = patch_file(p, oldpath, tmp);
609 	if (err)
610 		goto done;
611 
612 	if (rename(tmppath, newpath) == -1) {
613 		err = got_error_from_errno3("rename", tmppath, newpath);
614 		goto done;
615 	}
616 
617 	if (file_renamed) {
618 		err = got_worktree_schedule_delete(worktree, &oldpaths,
619 		    0, NULL, delete_cb, delete_arg, repo, 0, 0);
620 		if (err == NULL)
621 			err = got_worktree_schedule_add(worktree, &newpaths,
622 			    add_cb, add_arg, repo, 1);
623 	} else if (p->old == NULL)
624 		err = got_worktree_schedule_add(worktree, &newpaths,
625 		    add_cb, add_arg, repo, 1);
626 	else
627 		printf("M  %s\n", oldpath); /* XXX */
628 
629 done:
630 	if (err != NULL && newpath != NULL && (file_renamed || p->old == NULL))
631 		unlink(newpath);
632 	free(template);
633 	if (tmppath != NULL)
634 		unlink(tmppath);
635 	free(tmppath);
636 	got_pathlist_free(&oldpaths);
637 	got_pathlist_free(&newpaths);
638 	free(oldpath);
639 	free(newpath);
640 	return err;
641 }
642 
643 const struct got_error *
644 got_patch(int fd, struct got_worktree *worktree, struct got_repository *repo,
645     got_worktree_delete_cb delete_cb, void *delete_arg,
646     got_worktree_checkout_cb add_cb, void *add_arg, got_cancel_cb cancel_cb,
647     void *cancel_arg)
648 {
649 	const struct got_error *err = NULL;
650 	struct imsgbuf *ibuf;
651 	int imsg_fds[2] = {-1, -1};
652 	int done = 0;
653 	pid_t pid;
654 
655 	ibuf = calloc(1, sizeof(*ibuf));
656 	if (ibuf == NULL) {
657 		err = got_error_from_errno("calloc");
658 		goto done;
659 	}
660 
661 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
662 		err = got_error_from_errno("socketpair");
663 		goto done;
664 	}
665 
666 	pid = fork();
667 	if (pid == -1) {
668 		err = got_error_from_errno("fork");
669 		goto done;
670 	} else if (pid == 0) {
671 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_PATCH,
672 		    NULL);
673 		/* not reached */
674 	}
675 
676 	if (close(imsg_fds[1]) == -1) {
677 		err = got_error_from_errno("close");
678 		goto done;
679 	}
680 	imsg_fds[1] = -1;
681 	imsg_init(ibuf, imsg_fds[0]);
682 
683 	err = send_patch(ibuf, fd);
684 	fd = -1;
685 	if (err)
686 		goto done;
687 
688 	while (!done && err == NULL) {
689 		struct got_patch p;
690 
691 		err = recv_patch(ibuf, &done, &p);
692 		if (err || done)
693 			break;
694 
695 		err = apply_patch(worktree, repo, &p, delete_cb, delete_arg,
696 		    add_cb, add_arg, cancel_cb, cancel_arg);
697 		patch_free(&p);
698 		if (err)
699 			break;
700 	}
701 
702 done:
703 	if (fd != -1 && close(fd) == -1 && err == NULL)
704 		err = got_error_from_errno("close");
705 	if (ibuf != NULL)
706 		imsg_clear(ibuf);
707 	if (imsg_fds[0] != -1 && close(imsg_fds[0]) == -1 && err == NULL)
708 		err = got_error_from_errno("close");
709 	if (imsg_fds[1] != -1 && close(imsg_fds[1]) == -1 && err == NULL)
710 		err = got_error_from_errno("close");
711 	return err;
712 }