1 /*
2  * Copyright (c) 2019 Stefan Sperling <stsp@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 
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <sys/queue.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #include <fcntl.h>
24 #include <limits.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <stdint.h>
29 #include <sha1.h>
30 #include <unistd.h>
31 #include <zlib.h>
32 
33 #include "got_error.h"
34 #include "got_object.h"
35 #include "got_repository.h"
36 #include "got_opentemp.h"
37 #include "got_path.h"
38 
39 #include "got_lib_sha1.h"
40 #include "got_lib_deflate.h"
41 #include "got_lib_delta.h"
42 #include "got_lib_object.h"
43 #include "got_lib_object_parse.h"
44 #include "got_lib_lockfile.h"
45 
46 #ifndef nitems
47 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
48 #endif
49 
50 static const struct got_error *
51 create_object_file(struct got_object_id *id, FILE *content,
52     struct got_repository *repo)
53 {
54 	const struct got_error *err = NULL, *unlock_err = NULL;
55 	char *objpath = NULL, *tmppath = NULL;
56 	FILE *tmpfile = NULL;
57 	struct got_lockfile *lf = NULL;
58 	size_t tmplen = 0;
59 
60 	err = got_object_get_path(&objpath, id, repo);
61 	if (err)
62 		return err;
63 
64 	err = got_opentemp_named(&tmppath, &tmpfile, objpath);
65 	if (err) {
66 		char *parent_path;
67 		if (!(err->code == GOT_ERR_ERRNO && errno == ENOENT))
68 			goto done;
69 		err = got_path_dirname(&parent_path, objpath);
70 		if (err)
71 			goto done;
72 		err = got_path_mkdir(parent_path);
73 		free(parent_path);
74 		if (err)
75 			goto done;
76 		err = got_opentemp_named(&tmppath, &tmpfile, objpath);
77 		if (err)
78 			goto done;
79 	}
80 
81 	if (fchmod(fileno(tmpfile), GOT_DEFAULT_FILE_MODE) != 0) {
82 		err = got_error_from_errno2("fchmod", tmppath);
83 		goto done;
84 	}
85 
86 	err = got_deflate_to_file(&tmplen, content, tmpfile, NULL);
87 	if (err)
88 		goto done;
89 
90 	err = got_lockfile_lock(&lf, objpath, -1);
91 	if (err)
92 		goto done;
93 
94 	if (rename(tmppath, objpath) != 0) {
95 		err = got_error_from_errno3("rename", tmppath, objpath);
96 		goto done;
97 	}
98 	free(tmppath);
99 	tmppath = NULL;
100 done:
101 	free(objpath);
102 	if (tmppath) {
103 		if (unlink(tmppath) != 0 && err == NULL)
104 			err = got_error_from_errno2("unlink", tmppath);
105 		free(tmppath);
106 	}
107 	if (tmpfile && fclose(tmpfile) == EOF && err == NULL)
108 		err = got_error_from_errno("fclose");
109 	if (lf)
110 		unlock_err = got_lockfile_unlock(lf, -1);
111 	return err ? err : unlock_err;
112 }
113 
114 const struct got_error *
115 got_object_blob_file_create(struct got_object_id **id, FILE **blobfile,
116     const char *ondisk_path)
117 {
118 	const struct got_error *err = NULL;
119 	char *header = NULL;
120 	int fd = -1;
121 	struct stat sb;
122 	SHA1_CTX sha1_ctx;
123 	size_t headerlen = 0, n;
124 
125 	*id = NULL;
126 	*blobfile = NULL;
127 
128 	SHA1Init(&sha1_ctx);
129 
130 	fd = open(ondisk_path, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
131 	if (fd == -1) {
132 		if (!got_err_open_nofollow_on_symlink())
133 			return got_error_from_errno2("open", ondisk_path);
134 
135 		if (lstat(ondisk_path, &sb) == -1) {
136 			err = got_error_from_errno2("lstat", ondisk_path);
137 			goto done;
138 		}
139 	} else if (fstat(fd, &sb) == -1) {
140 		err = got_error_from_errno2("fstat", ondisk_path);
141 		goto done;
142 	}
143 
144 	if (asprintf(&header, "%s %lld", GOT_OBJ_LABEL_BLOB,
145 		(long long)sb.st_size) == -1) {
146 		err = got_error_from_errno("asprintf");
147 		goto done;
148 	}
149 	headerlen = strlen(header) + 1;
150 	SHA1Update(&sha1_ctx, header, headerlen);
151 
152 	*blobfile = got_opentemp();
153 	if (*blobfile == NULL) {
154 		err = got_error_from_errno("got_opentemp");
155 		goto done;
156 	}
157 
158 	n = fwrite(header, 1, headerlen, *blobfile);
159 	if (n != headerlen) {
160 		err = got_ferror(*blobfile, GOT_ERR_IO);
161 		goto done;
162 	}
163 	for (;;) {
164 		char buf[PATH_MAX * 8];
165 		ssize_t inlen;
166 
167 		if (S_ISLNK(sb.st_mode)) {
168 			inlen = readlink(ondisk_path, buf, sizeof(buf));
169 			if (inlen == -1) {
170 				err = got_error_from_errno("readlink");
171 				goto done;
172 			}
173 		} else {
174 			inlen = read(fd, buf, sizeof(buf));
175 			if (inlen == -1) {
176 				err = got_error_from_errno("read");
177 				goto done;
178 			}
179 		}
180 		if (inlen == 0)
181 			break; /* EOF */
182 		SHA1Update(&sha1_ctx, buf, inlen);
183 		n = fwrite(buf, 1, inlen, *blobfile);
184 		if (n != inlen) {
185 			err = got_ferror(*blobfile, GOT_ERR_IO);
186 			goto done;
187 		}
188 		if (S_ISLNK(sb.st_mode))
189 			break;
190 	}
191 
192 	*id = malloc(sizeof(**id));
193 	if (*id == NULL) {
194 		err = got_error_from_errno("malloc");
195 		goto done;
196 	}
197 	SHA1Final((*id)->sha1, &sha1_ctx);
198 
199 	if (fflush(*blobfile) != 0) {
200 		err = got_error_from_errno("fflush");
201 		goto done;
202 	}
203 	rewind(*blobfile);
204 done:
205 	free(header);
206 	if (fd != -1 && close(fd) == -1 && err == NULL)
207 		err = got_error_from_errno("close");
208 	if (err) {
209 		free(*id);
210 		*id = NULL;
211 		if (*blobfile) {
212 			fclose(*blobfile);
213 			*blobfile = NULL;
214 		}
215 	}
216 	return err;
217 }
218 
219 const struct got_error *
220 got_object_blob_create(struct got_object_id **id, const char *ondisk_path,
221     struct got_repository *repo)
222 {
223 	const struct got_error *err = NULL;
224 	FILE *blobfile = NULL;
225 
226 	err = got_object_blob_file_create(id, &blobfile, ondisk_path);
227 	if (err)
228 		return err;
229 
230 	err = create_object_file(*id, blobfile, repo);
231 	if (fclose(blobfile) == EOF && err == NULL)
232 		err = got_error_from_errno("fclose");
233 	if (err) {
234 		free(*id);
235 		*id = NULL;
236 	}
237 	return err;
238 }
239 
240 static const struct got_error *
241 te_mode2str(char *buf, size_t len, struct got_tree_entry *te)
242 {
243 	int ret;
244 	mode_t mode;
245 
246 	/*
247 	 * Some Git implementations are picky about modes seen in tree entries.
248 	 * For best compatibility we normalize the file/directory mode here.
249 	 */
250 	if (S_ISREG(te->mode)) {
251 		mode = GOT_DEFAULT_FILE_MODE;
252 		if (te->mode & (S_IXUSR | S_IXGRP | S_IXOTH))
253 			mode |= S_IXUSR | S_IXGRP | S_IXOTH;
254 	} else if (got_object_tree_entry_is_submodule(te))
255 		mode = S_IFDIR | S_IFLNK;
256 	else if (S_ISLNK(te->mode))
257 		mode = S_IFLNK; /* Git leaves all the other bits unset. */
258 	else if (S_ISDIR(te->mode))
259 		mode = S_IFDIR; /* Git leaves all the other bits unset. */
260 	else
261 		return got_error(GOT_ERR_BAD_FILETYPE);
262 
263 	ret = snprintf(buf, len, "%o ", mode);
264 	if (ret == -1 || ret >= len)
265 		return got_error(GOT_ERR_NO_SPACE);
266 	return NULL;
267 }
268 
269 /*
270  * Git expects directory tree entries to be sorted with an imaginary slash
271  * appended to their name, and will break otherwise. Let's be nice.
272  * This function is intended to be used with mergesort(3) to sort an
273  * array of pointers to struct got_tree_entry objects.
274  */
275 static int
276 sort_tree_entries_the_way_git_likes_it(const void *arg1, const void *arg2)
277 {
278 	struct got_tree_entry * const *te1 = arg1;
279 	struct got_tree_entry * const *te2 = arg2;
280 	char name1[NAME_MAX + 2];
281 	char name2[NAME_MAX + 2];
282 
283 	strlcpy(name1, (*te1)->name, sizeof(name1));
284 	strlcpy(name2, (*te2)->name, sizeof(name2));
285 	if (S_ISDIR((*te1)->mode))
286 		strlcat(name1, "/", sizeof(name1));
287 	if (S_ISDIR((*te2)->mode))
288 		strlcat(name2, "/", sizeof(name2));
289 	return strcmp(name1, name2);
290 }
291 
292 const struct got_error *
293 got_object_tree_create(struct got_object_id **id,
294     struct got_pathlist_head *paths, int nentries, struct got_repository *repo)
295 {
296 	const struct got_error *err = NULL;
297 	char modebuf[sizeof("100644 ")];
298 	SHA1_CTX sha1_ctx;
299 	char *header = NULL;
300 	size_t headerlen, len = 0, n;
301 	FILE *treefile = NULL;
302 	struct got_pathlist_entry *pe;
303 	struct got_tree_entry **sorted_entries;
304 	struct got_tree_entry *te;
305 	int i;
306 
307 	*id = NULL;
308 
309 	SHA1Init(&sha1_ctx);
310 
311 	sorted_entries = calloc(nentries, sizeof(struct got_tree_entry *));
312 	if (sorted_entries == NULL)
313 		return got_error_from_errno("calloc");
314 
315 	i = 0;
316 	TAILQ_FOREACH(pe, paths, entry)
317 		sorted_entries[i++] = pe->data;
318 	mergesort(sorted_entries, nentries, sizeof(struct got_tree_entry *),
319 	    sort_tree_entries_the_way_git_likes_it);
320 
321 	for (i = 0; i < nentries; i++) {
322 		te = sorted_entries[i];
323 		err = te_mode2str(modebuf, sizeof(modebuf), te);
324 		if (err)
325 			goto done;
326 		len += strlen(modebuf) + strlen(te->name) + 1 +
327 		    SHA1_DIGEST_LENGTH;
328 	}
329 
330 	if (asprintf(&header, "%s %zd", GOT_OBJ_LABEL_TREE, len) == -1) {
331 		err = got_error_from_errno("asprintf");
332 		goto done;
333 	}
334 	headerlen = strlen(header) + 1;
335 	SHA1Update(&sha1_ctx, header, headerlen);
336 
337 	treefile = got_opentemp();
338 	if (treefile == NULL) {
339 		err = got_error_from_errno("got_opentemp");
340 		goto done;
341 	}
342 
343 	n = fwrite(header, 1, headerlen, treefile);
344 	if (n != headerlen) {
345 		err = got_ferror(treefile, GOT_ERR_IO);
346 		goto done;
347 	}
348 
349 	for (i = 0; i < nentries; i++) {
350 		te = sorted_entries[i];
351 		err = te_mode2str(modebuf, sizeof(modebuf), te);
352 		if (err)
353 			goto done;
354 		len = strlen(modebuf);
355 		n = fwrite(modebuf, 1, len, treefile);
356 		if (n != len) {
357 			err = got_ferror(treefile, GOT_ERR_IO);
358 			goto done;
359 		}
360 		SHA1Update(&sha1_ctx, modebuf, len);
361 
362 		len = strlen(te->name) + 1; /* must include NUL */
363 		n = fwrite(te->name, 1, len, treefile);
364 		if (n != len) {
365 			err = got_ferror(treefile, GOT_ERR_IO);
366 			goto done;
367 		}
368 		SHA1Update(&sha1_ctx, te->name, len);
369 
370 		len = SHA1_DIGEST_LENGTH;
371 		n = fwrite(te->id.sha1, 1, len, treefile);
372 		if (n != len) {
373 			err = got_ferror(treefile, GOT_ERR_IO);
374 			goto done;
375 		}
376 		SHA1Update(&sha1_ctx, te->id.sha1, len);
377 	}
378 
379 	*id = malloc(sizeof(**id));
380 	if (*id == NULL) {
381 		err = got_error_from_errno("malloc");
382 		goto done;
383 	}
384 	SHA1Final((*id)->sha1, &sha1_ctx);
385 
386 	if (fflush(treefile) != 0) {
387 		err = got_error_from_errno("fflush");
388 		goto done;
389 	}
390 	rewind(treefile);
391 
392 	err = create_object_file(*id, treefile, repo);
393 done:
394 	free(header);
395 	free(sorted_entries);
396 	if (treefile && fclose(treefile) == EOF && err == NULL)
397 		err = got_error_from_errno("fclose");
398 	if (err) {
399 		free(*id);
400 		*id = NULL;
401 	}
402 	return err;
403 }
404 
405 const struct got_error *
406 got_object_commit_create(struct got_object_id **id,
407     struct got_object_id *tree_id, struct got_object_id_queue *parent_ids,
408     int nparents, const char *author, time_t author_time,
409     const char *committer, time_t committer_time,
410     const char *logmsg, struct got_repository *repo)
411 {
412 	const struct got_error *err = NULL;
413 	SHA1_CTX sha1_ctx;
414 	char *header = NULL, *tree_str = NULL;
415 	char *author_str = NULL, *committer_str = NULL;
416 	char *id_str = NULL;
417 	size_t headerlen, len = 0, n;
418 	FILE *commitfile = NULL;
419 	struct got_object_qid *qid;
420 	char *msg0, *msg;
421 
422 	*id = NULL;
423 
424 	SHA1Init(&sha1_ctx);
425 
426 	msg0 = strdup(logmsg);
427 	if (msg0 == NULL)
428 		return got_error_from_errno("strdup");
429 	msg = msg0;
430 
431 	while (isspace((unsigned char)msg[0]))
432 		msg++;
433 	len = strlen(msg);
434 	while (len > 0 && isspace((unsigned char)msg[len - 1])) {
435 		msg[len - 1] = '\0';
436 		len--;
437 	}
438 
439 	if (asprintf(&author_str, "%s%s %lld +0000\n",
440 	    GOT_COMMIT_LABEL_AUTHOR, author, (long long)author_time) == -1)
441 		return got_error_from_errno("asprintf");
442 
443 	if (asprintf(&committer_str, "%s%s %lld +0000\n",
444 	    GOT_COMMIT_LABEL_COMMITTER, committer ? committer : author,
445 	    (long long)(committer ? committer_time : author_time))
446 	    == -1) {
447 		err = got_error_from_errno("asprintf");
448 		goto done;
449 	}
450 
451 	len = strlen(GOT_COMMIT_LABEL_TREE) + SHA1_DIGEST_STRING_LENGTH +
452 	    nparents *
453 	    (strlen(GOT_COMMIT_LABEL_PARENT) + SHA1_DIGEST_STRING_LENGTH) +
454 	    + strlen(author_str) + strlen(committer_str) + 2 + strlen(msg);
455 
456 	if (asprintf(&header, "%s %zd", GOT_OBJ_LABEL_COMMIT, len) == -1) {
457 		err = got_error_from_errno("asprintf");
458 		goto done;
459 	}
460 	headerlen = strlen(header) + 1;
461 	SHA1Update(&sha1_ctx, header, headerlen);
462 
463 	commitfile = got_opentemp();
464 	if (commitfile == NULL) {
465 		err = got_error_from_errno("got_opentemp");
466 		goto done;
467 	}
468 
469 	n = fwrite(header, 1, headerlen, commitfile);
470 	if (n != headerlen) {
471 		err = got_ferror(commitfile, GOT_ERR_IO);
472 		goto done;
473 	}
474 
475 	err = got_object_id_str(&id_str, tree_id);
476 	if (err)
477 		goto done;
478 	if (asprintf(&tree_str, "%s%s\n", GOT_COMMIT_LABEL_TREE, id_str)
479 	    == -1) {
480 		err = got_error_from_errno("asprintf");
481 		goto done;
482 	}
483 	len = strlen(tree_str);
484 	SHA1Update(&sha1_ctx, tree_str, len);
485 	n = fwrite(tree_str, 1, len, commitfile);
486 	if (n != len) {
487 		err = got_ferror(commitfile, GOT_ERR_IO);
488 		goto done;
489 	}
490 
491 	if (parent_ids) {
492 		free(id_str);
493 		id_str = NULL;
494 		STAILQ_FOREACH(qid, parent_ids, entry) {
495 			char *parent_str = NULL;
496 
497 			err = got_object_id_str(&id_str, qid->id);
498 			if (err)
499 				goto done;
500 			if (asprintf(&parent_str, "%s%s\n",
501 			    GOT_COMMIT_LABEL_PARENT, id_str) == -1) {
502 				err = got_error_from_errno("asprintf");
503 				goto done;
504 			}
505 			len = strlen(parent_str);
506 			SHA1Update(&sha1_ctx, parent_str, len);
507 			n = fwrite(parent_str, 1, len, commitfile);
508 			if (n != len) {
509 				err = got_ferror(commitfile, GOT_ERR_IO);
510 				free(parent_str);
511 				goto done;
512 			}
513 			free(parent_str);
514 			free(id_str);
515 			id_str = NULL;
516 		}
517 	}
518 
519 	len = strlen(author_str);
520 	SHA1Update(&sha1_ctx, author_str, len);
521 	n = fwrite(author_str, 1, len, commitfile);
522 	if (n != len) {
523 		err = got_ferror(commitfile, GOT_ERR_IO);
524 		goto done;
525 	}
526 
527 	len = strlen(committer_str);
528 	SHA1Update(&sha1_ctx, committer_str, len);
529 	n = fwrite(committer_str, 1, len, commitfile);
530 	if (n != len) {
531 		err = got_ferror(commitfile, GOT_ERR_IO);
532 		goto done;
533 	}
534 
535 	SHA1Update(&sha1_ctx, "\n", 1);
536 	n = fwrite("\n", 1, 1, commitfile);
537 	if (n != 1) {
538 		err = got_ferror(commitfile, GOT_ERR_IO);
539 		goto done;
540 	}
541 
542 	len = strlen(msg);
543 	SHA1Update(&sha1_ctx, msg, len);
544 	n = fwrite(msg, 1, len, commitfile);
545 	if (n != len) {
546 		err = got_ferror(commitfile, GOT_ERR_IO);
547 		goto done;
548 	}
549 
550 	SHA1Update(&sha1_ctx, "\n", 1);
551 	n = fwrite("\n", 1, 1, commitfile);
552 	if (n != 1) {
553 		err = got_ferror(commitfile, GOT_ERR_IO);
554 		goto done;
555 	}
556 
557 	*id = malloc(sizeof(**id));
558 	if (*id == NULL) {
559 		err = got_error_from_errno("malloc");
560 		goto done;
561 	}
562 	SHA1Final((*id)->sha1, &sha1_ctx);
563 
564 	if (fflush(commitfile) != 0) {
565 		err = got_error_from_errno("fflush");
566 		goto done;
567 	}
568 	rewind(commitfile);
569 
570 	err = create_object_file(*id, commitfile, repo);
571 done:
572 	free(id_str);
573 	free(msg0);
574 	free(header);
575 	free(tree_str);
576 	free(author_str);
577 	free(committer_str);
578 	if (commitfile && fclose(commitfile) == EOF && err == NULL)
579 		err = got_error_from_errno("fclose");
580 	if (err) {
581 		free(*id);
582 		*id = NULL;
583 	}
584 	return err;
585 }
586 
587 const struct got_error *
588 got_object_tag_create(struct got_object_id **id,
589     const char *tag_name, struct got_object_id *object_id, const char *tagger,
590     time_t tagger_time, const char *tagmsg, struct got_repository *repo)
591 {
592 	const struct got_error *err = NULL;
593 	SHA1_CTX sha1_ctx;
594 	char *header = NULL;
595 	char *tag_str = NULL, *tagger_str = NULL;
596 	char *id_str = NULL, *obj_str = NULL, *type_str = NULL;
597 	size_t headerlen, len = 0, n;
598 	FILE *tagfile = NULL;
599 	char *msg0 = NULL, *msg;
600 	const char *obj_type_str;
601 	int obj_type;
602 
603 	*id = NULL;
604 
605 	SHA1Init(&sha1_ctx);
606 
607 	err = got_object_id_str(&id_str, object_id);
608 	if (err)
609 		goto done;
610 	if (asprintf(&obj_str, "%s%s\n", GOT_TAG_LABEL_OBJECT, id_str) == -1) {
611 		err = got_error_from_errno("asprintf");
612 		goto done;
613 	}
614 
615 	err = got_object_get_type(&obj_type, repo, object_id);
616 	if (err)
617 		goto done;
618 
619 	switch (obj_type) {
620 	case GOT_OBJ_TYPE_BLOB:
621 		obj_type_str = GOT_OBJ_LABEL_BLOB;
622 		break;
623 	case GOT_OBJ_TYPE_TREE:
624 		obj_type_str = GOT_OBJ_LABEL_TREE;
625 		break;
626 	case GOT_OBJ_TYPE_COMMIT:
627 		obj_type_str = GOT_OBJ_LABEL_COMMIT;
628 		break;
629 	case GOT_OBJ_TYPE_TAG:
630 		obj_type_str = GOT_OBJ_LABEL_TAG;
631 		break;
632 	default:
633 		err = got_error(GOT_ERR_OBJ_TYPE);
634 		goto done;
635 	}
636 
637 	if (asprintf(&type_str, "%s%s\n", GOT_TAG_LABEL_TYPE,
638 	    obj_type_str) == -1) {
639 		err = got_error_from_errno("asprintf");
640 		goto done;
641 	}
642 
643 	if (asprintf(&tag_str, "%s%s\n", GOT_TAG_LABEL_TAG, tag_name) == -1) {
644 		err = got_error_from_errno("asprintf");
645 		goto done;
646 	}
647 
648 	if (asprintf(&tagger_str, "%s%s %lld +0000\n",
649 	    GOT_TAG_LABEL_TAGGER, tagger, (long long)tagger_time) == -1)
650 		return got_error_from_errno("asprintf");
651 
652 	msg0 = strdup(tagmsg);
653 	if (msg0 == NULL) {
654 		err = got_error_from_errno("strdup");
655 		goto done;
656 	}
657 	msg = msg0;
658 
659 	while (isspace((unsigned char)msg[0]))
660 		msg++;
661 
662 	len = strlen(obj_str) + strlen(type_str) + strlen(tag_str) +
663 	    strlen(tagger_str) + 1 + strlen(msg) + 1;
664 
665 	if (asprintf(&header, "%s %zd", GOT_OBJ_LABEL_TAG, len) == -1) {
666 		err = got_error_from_errno("asprintf");
667 		goto done;
668 	}
669 
670 	headerlen = strlen(header) + 1;
671 	SHA1Update(&sha1_ctx, header, headerlen);
672 
673 	tagfile = got_opentemp();
674 	if (tagfile == NULL) {
675 		err = got_error_from_errno("got_opentemp");
676 		goto done;
677 	}
678 
679 	n = fwrite(header, 1, headerlen, tagfile);
680 	if (n != headerlen) {
681 		err = got_ferror(tagfile, GOT_ERR_IO);
682 		goto done;
683 	}
684 	len = strlen(obj_str);
685 	SHA1Update(&sha1_ctx, obj_str, len);
686 	n = fwrite(obj_str, 1, len, tagfile);
687 	if (n != len) {
688 		err = got_ferror(tagfile, GOT_ERR_IO);
689 		goto done;
690 	}
691 	len = strlen(type_str);
692 	SHA1Update(&sha1_ctx, type_str, len);
693 	n = fwrite(type_str, 1, len, tagfile);
694 	if (n != len) {
695 		err = got_ferror(tagfile, GOT_ERR_IO);
696 		goto done;
697 	}
698 
699 	len = strlen(tag_str);
700 	SHA1Update(&sha1_ctx, tag_str, len);
701 	n = fwrite(tag_str, 1, len, tagfile);
702 	if (n != len) {
703 		err = got_ferror(tagfile, GOT_ERR_IO);
704 		goto done;
705 	}
706 
707 	len = strlen(tagger_str);
708 	SHA1Update(&sha1_ctx, tagger_str, len);
709 	n = fwrite(tagger_str, 1, len, tagfile);
710 	if (n != len) {
711 		err = got_ferror(tagfile, GOT_ERR_IO);
712 		goto done;
713 	}
714 
715 	SHA1Update(&sha1_ctx, "\n", 1);
716 	n = fwrite("\n", 1, 1, tagfile);
717 	if (n != 1) {
718 		err = got_ferror(tagfile, GOT_ERR_IO);
719 		goto done;
720 	}
721 
722 	len = strlen(msg);
723 	SHA1Update(&sha1_ctx, msg, len);
724 	n = fwrite(msg, 1, len, tagfile);
725 	if (n != len) {
726 		err = got_ferror(tagfile, GOT_ERR_IO);
727 		goto done;
728 	}
729 
730 	SHA1Update(&sha1_ctx, "\n", 1);
731 	n = fwrite("\n", 1, 1, tagfile);
732 	if (n != 1) {
733 		err = got_ferror(tagfile, GOT_ERR_IO);
734 		goto done;
735 	}
736 
737 	*id = malloc(sizeof(**id));
738 	if (*id == NULL) {
739 		err = got_error_from_errno("malloc");
740 		goto done;
741 	}
742 	SHA1Final((*id)->sha1, &sha1_ctx);
743 
744 	if (fflush(tagfile) != 0) {
745 		err = got_error_from_errno("fflush");
746 		goto done;
747 	}
748 	rewind(tagfile);
749 
750 	err = create_object_file(*id, tagfile, repo);
751 done:
752 	free(msg0);
753 	free(header);
754 	free(obj_str);
755 	free(tagger_str);
756 	if (tagfile && fclose(tagfile) == EOF && err == NULL)
757 		err = got_error_from_errno("fclose");
758 	if (err) {
759 		free(*id);
760 		*id = NULL;
761 	}
762 	return err;
763 }