xref: /dragonfly/contrib/libarchive/tar/write.c (revision 335b9e93)
1 /*-
2  * Copyright (c) 2003-2007 Tim Kientzle
3  * Copyright (c) 2012 Michihiro NAKAJIMA
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26 
27 #include "bsdtar_platform.h"
28 __FBSDID("$FreeBSD: src/usr.bin/tar/write.c,v 1.79 2008/11/27 05:49:52 kientzle Exp $");
29 
30 #ifdef HAVE_SYS_TYPES_H
31 #include <sys/types.h>
32 #endif
33 #ifdef HAVE_SYS_STAT_H
34 #include <sys/stat.h>
35 #endif
36 #ifdef HAVE_ATTR_XATTR_H
37 #include <attr/xattr.h>
38 #endif
39 #ifdef HAVE_ERRNO_H
40 #include <errno.h>
41 #endif
42 #ifdef HAVE_FCNTL_H
43 #include <fcntl.h>
44 #endif
45 #ifdef HAVE_GRP_H
46 #include <grp.h>
47 #endif
48 #ifdef HAVE_IO_H
49 #include <io.h>
50 #endif
51 #ifdef HAVE_LIBGEN_H
52 #include <libgen.h>
53 #endif
54 #ifdef HAVE_LIMITS_H
55 #include <limits.h>
56 #endif
57 #ifdef HAVE_PATHS_H
58 #include <paths.h>
59 #endif
60 #ifdef HAVE_PWD_H
61 #include <pwd.h>
62 #endif
63 #ifdef HAVE_STDINT_H
64 #include <stdint.h>
65 #endif
66 #include <stdio.h>
67 #ifdef HAVE_STDLIB_H
68 #include <stdlib.h>
69 #endif
70 #ifdef HAVE_STRING_H
71 #include <string.h>
72 #endif
73 #ifdef HAVE_UNISTD_H
74 #include <unistd.h>
75 #endif
76 
77 #include "bsdtar.h"
78 #include "err.h"
79 #include "line_reader.h"
80 
81 #ifndef O_BINARY
82 #define	O_BINARY 0
83 #endif
84 
85 struct archive_dir_entry {
86 	struct archive_dir_entry	*next;
87 	time_t			 mtime_sec;
88 	int			 mtime_nsec;
89 	char			*name;
90 };
91 
92 struct archive_dir {
93 	struct archive_dir_entry *head, *tail;
94 };
95 
96 static int		 append_archive(struct bsdtar *, struct archive *,
97 			     struct archive *ina);
98 static int		 append_archive_filename(struct bsdtar *,
99 			     struct archive *, const char *fname);
100 static void		 archive_names_from_file(struct bsdtar *bsdtar,
101 			     struct archive *a);
102 static int		 copy_file_data_block(struct bsdtar *,
103 			     struct archive *a, struct archive *,
104 			     struct archive_entry *);
105 static void		 excluded_callback(struct archive *, void *,
106 			     struct archive_entry *);
107 static void		 report_write(struct bsdtar *, struct archive *,
108 			     struct archive_entry *, int64_t progress);
109 static void		 test_for_append(struct bsdtar *);
110 static int		 metadata_filter(struct archive *, void *,
111 			     struct archive_entry *);
112 static void		 write_archive(struct archive *, struct bsdtar *);
113 static void		 write_entry(struct bsdtar *, struct archive *,
114 			     struct archive_entry *);
115 static void		 write_file(struct bsdtar *, struct archive *,
116 			     struct archive_entry *);
117 static void		 write_hierarchy(struct bsdtar *, struct archive *,
118 			     const char *);
119 
120 #if defined(_WIN32) && !defined(__CYGWIN__)
121 /* Not a full lseek() emulation, but enough for our needs here. */
122 static int
123 seek_file(int fd, int64_t offset, int whence)
124 {
125 	LARGE_INTEGER distance;
126 	(void)whence; /* UNUSED */
127 	distance.QuadPart = offset;
128 	return (SetFilePointerEx((HANDLE)_get_osfhandle(fd),
129 		distance, NULL, FILE_BEGIN) ? 1 : -1);
130 }
131 #define	open _open
132 #define	close _close
133 #define	read _read
134 #ifdef lseek
135 #undef lseek
136 #endif
137 #define	lseek seek_file
138 #endif
139 
140 static void
141 set_writer_options(struct bsdtar *bsdtar, struct archive *a)
142 {
143 	const char *writer_options;
144 	int r;
145 
146 	writer_options = getenv(ENV_WRITER_OPTIONS);
147 	if (writer_options != NULL) {
148 		size_t module_len = sizeof(IGNORE_WRONG_MODULE_NAME) - 1;
149 		size_t opt_len = strlen(writer_options) + 1;
150 		char *p;
151 		/* Set default write options. */
152 		if ((p = malloc(module_len + opt_len)) == NULL)
153 			lafe_errc(1, errno, "Out of memory");
154 		/* Prepend magic code to ignore options for
155 		 * a format or filters which are not added to
156 		 * the archive write object. */
157 		memcpy(p, IGNORE_WRONG_MODULE_NAME, module_len);
158 		memcpy(p, writer_options, opt_len);
159 		r = archive_write_set_options(a, p);
160 		free(p);
161 		if (r < ARCHIVE_WARN)
162 			lafe_errc(1, 0, "%s", archive_error_string(a));
163 		else
164 			archive_clear_error(a);
165 	}
166 	if (ARCHIVE_OK != archive_write_set_options(a, bsdtar->option_options))
167 		lafe_errc(1, 0, "%s", archive_error_string(a));
168 }
169 
170 static void
171 set_reader_options(struct bsdtar *bsdtar, struct archive *a)
172 {
173 	const char *reader_options;
174 	int r;
175 
176 	(void)bsdtar; /* UNUSED */
177 
178 	reader_options = getenv(ENV_READER_OPTIONS);
179 	if (reader_options != NULL) {
180 		size_t module_len = sizeof(IGNORE_WRONG_MODULE_NAME) - 1;
181 		size_t opt_len = strlen(reader_options) + 1;
182 		char *p;
183 		/* Set default write options. */
184 		if ((p = malloc(module_len + opt_len)) == NULL)
185 		if (p == NULL)
186 			lafe_errc(1, errno, "Out of memory");
187 		/* Prepend magic code to ignore options for
188 		 * a format or filters which are not added to
189 		 * the archive write object. */
190 		memcpy(p, IGNORE_WRONG_MODULE_NAME, module_len);
191 		memcpy(p, reader_options, opt_len);
192 		r = archive_read_set_options(a, p);
193 		free(p);
194 		if (r < ARCHIVE_WARN)
195 			lafe_errc(1, 0, "%s", archive_error_string(a));
196 		else
197 			archive_clear_error(a);
198 	}
199 }
200 
201 void
202 tar_mode_c(struct bsdtar *bsdtar)
203 {
204 	struct archive *a;
205 	const void *filter_name;
206 	int r;
207 
208 	if (*bsdtar->argv == NULL && bsdtar->names_from_file == NULL)
209 		lafe_errc(1, 0, "no files or directories specified");
210 
211 	a = archive_write_new();
212 
213 	/* Support any format that the library supports. */
214 	if (cset_get_format(bsdtar->cset) == NULL) {
215 		r = archive_write_set_format_pax_restricted(a);
216 		cset_set_format(bsdtar->cset, "pax restricted");
217 	} else {
218 		r = archive_write_set_format_by_name(a,
219 			cset_get_format(bsdtar->cset));
220 	}
221 	if (r != ARCHIVE_OK) {
222 		fprintf(stderr, "Can't use format %s: %s\n",
223 		    cset_get_format(bsdtar->cset),
224 		    archive_error_string(a));
225 		usage();
226 	}
227 
228 	archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block);
229 	archive_write_set_bytes_in_last_block(a, bsdtar->bytes_in_last_block);
230 
231 	r = cset_write_add_filters(bsdtar->cset, a, &filter_name);
232 	if (r < ARCHIVE_WARN) {
233 		lafe_errc(1, 0, "Unsupported compression option --%s",
234 		    (const char *)filter_name);
235 	}
236 
237 	set_writer_options(bsdtar, a);
238 	if (bsdtar->passphrase != NULL)
239 		r = archive_write_set_passphrase(a, bsdtar->passphrase);
240 	else
241 		r = archive_write_set_passphrase_callback(a, bsdtar,
242 			&passphrase_callback);
243 	if (r != ARCHIVE_OK)
244 		lafe_errc(1, 0, "%s", archive_error_string(a));
245 	if (ARCHIVE_OK != archive_write_open_filename(a, bsdtar->filename))
246 		lafe_errc(1, 0, "%s", archive_error_string(a));
247 	write_archive(a, bsdtar);
248 }
249 
250 /*
251  * Same as 'c', except we only support tar or empty formats in
252  * uncompressed files on disk.
253  */
254 void
255 tar_mode_r(struct bsdtar *bsdtar)
256 {
257 	int64_t	end_offset;
258 	int	format;
259 	struct archive *a;
260 	struct archive_entry *entry;
261 	int	r;
262 
263 	/* Sanity-test some arguments and the file. */
264 	test_for_append(bsdtar);
265 
266 	format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;
267 
268 #if defined(__BORLANDC__)
269 	bsdtar->fd = open(bsdtar->filename, O_RDWR | O_CREAT | O_BINARY);
270 #else
271 	bsdtar->fd = open(bsdtar->filename, O_RDWR | O_CREAT | O_BINARY, 0666);
272 #endif
273 	if (bsdtar->fd < 0)
274 		lafe_errc(1, errno,
275 		    "Cannot open %s", bsdtar->filename);
276 
277 	a = archive_read_new();
278 	archive_read_support_filter_all(a);
279 	archive_read_support_format_empty(a);
280 	archive_read_support_format_tar(a);
281 	archive_read_support_format_gnutar(a);
282 	set_reader_options(bsdtar, a);
283 	r = archive_read_open_fd(a, bsdtar->fd, 10240);
284 	if (r != ARCHIVE_OK)
285 		lafe_errc(1, archive_errno(a),
286 		    "Can't read archive %s: %s", bsdtar->filename,
287 		    archive_error_string(a));
288 	while (0 == archive_read_next_header(a, &entry)) {
289 		if (archive_filter_code(a, 0) != ARCHIVE_FILTER_NONE) {
290 			archive_read_free(a);
291 			close(bsdtar->fd);
292 			lafe_errc(1, 0,
293 			    "Cannot append to compressed archive.");
294 		}
295 		/* Keep going until we hit end-of-archive */
296 		format = archive_format(a);
297 	}
298 
299 	end_offset = archive_read_header_position(a);
300 	archive_read_free(a);
301 
302 	/* Re-open archive for writing */
303 	a = archive_write_new();
304 	/*
305 	 * Set the format to be used for writing.  To allow people to
306 	 * extend empty files, we need to allow them to specify the format,
307 	 * which opens the possibility that they will specify a format that
308 	 * doesn't match the existing format.  Hence, the following bit
309 	 * of arcane ugliness.
310 	 */
311 
312 	if (cset_get_format(bsdtar->cset) != NULL) {
313 		/* If the user requested a format, use that, but ... */
314 		archive_write_set_format_by_name(a,
315 		    cset_get_format(bsdtar->cset));
316 		/* ... complain if it's not compatible. */
317 		format &= ARCHIVE_FORMAT_BASE_MASK;
318 		if (format != (int)(archive_format(a) & ARCHIVE_FORMAT_BASE_MASK)
319 		    && format != ARCHIVE_FORMAT_EMPTY) {
320 			lafe_errc(1, 0,
321 			    "Format %s is incompatible with the archive %s.",
322 			    cset_get_format(bsdtar->cset), bsdtar->filename);
323 		}
324 	} else {
325 		/*
326 		 * Just preserve the current format, with a little care
327 		 * for formats that libarchive can't write.
328 		 */
329 		if (format == ARCHIVE_FORMAT_EMPTY)
330 			format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;
331 		archive_write_set_format(a, format);
332 	}
333 	if (lseek(bsdtar->fd, end_offset, SEEK_SET) < 0)
334 		lafe_errc(1, errno, "Could not seek to archive end");
335 	set_writer_options(bsdtar, a);
336 	if (ARCHIVE_OK != archive_write_open_fd(a, bsdtar->fd))
337 		lafe_errc(1, 0, "%s", archive_error_string(a));
338 
339 	write_archive(a, bsdtar); /* XXX check return val XXX */
340 
341 	close(bsdtar->fd);
342 	bsdtar->fd = -1;
343 }
344 
345 void
346 tar_mode_u(struct bsdtar *bsdtar)
347 {
348 	int64_t			 end_offset;
349 	struct archive		*a;
350 	struct archive_entry	*entry;
351 	int			 format;
352 	struct archive_dir_entry	*p;
353 	struct archive_dir	 archive_dir;
354 
355 	bsdtar->archive_dir = &archive_dir;
356 	memset(&archive_dir, 0, sizeof(archive_dir));
357 
358 	format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;
359 
360 	/* Sanity-test some arguments and the file. */
361 	test_for_append(bsdtar);
362 
363 	bsdtar->fd = open(bsdtar->filename, O_RDWR | O_BINARY);
364 	if (bsdtar->fd < 0)
365 		lafe_errc(1, errno,
366 		    "Cannot open %s", bsdtar->filename);
367 
368 	a = archive_read_new();
369 	archive_read_support_filter_all(a);
370 	archive_read_support_format_tar(a);
371 	archive_read_support_format_gnutar(a);
372 	set_reader_options(bsdtar, a);
373 	if (archive_read_open_fd(a, bsdtar->fd, bsdtar->bytes_per_block)
374 	    != ARCHIVE_OK) {
375 		lafe_errc(1, 0,
376 		    "Can't open %s: %s", bsdtar->filename,
377 		    archive_error_string(a));
378 	}
379 
380 	/* Build a list of all entries and their recorded mod times. */
381 	while (0 == archive_read_next_header(a, &entry)) {
382 		if (archive_filter_code(a, 0) != ARCHIVE_FILTER_NONE) {
383 			archive_read_free(a);
384 			close(bsdtar->fd);
385 			lafe_errc(1, 0,
386 			    "Cannot append to compressed archive.");
387 		}
388 		if (archive_match_exclude_entry(bsdtar->matching,
389 		    ARCHIVE_MATCH_MTIME | ARCHIVE_MATCH_OLDER |
390 		    ARCHIVE_MATCH_EQUAL, entry) != ARCHIVE_OK)
391 			lafe_errc(1, 0, "Error : %s",
392 			    archive_error_string(bsdtar->matching));
393 		/* Record the last format determination we see */
394 		format = archive_format(a);
395 		/* Keep going until we hit end-of-archive */
396 	}
397 
398 	end_offset = archive_read_header_position(a);
399 	archive_read_free(a);
400 
401 	/* Re-open archive for writing. */
402 	a = archive_write_new();
403 	/*
404 	 * Set format to same one auto-detected above.
405 	 */
406 	archive_write_set_format(a, format);
407 	archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block);
408 	archive_write_set_bytes_in_last_block(a, bsdtar->bytes_in_last_block);
409 
410 	if (lseek(bsdtar->fd, end_offset, SEEK_SET) < 0)
411 		lafe_errc(1, errno, "Could not seek to archive end");
412 	set_writer_options(bsdtar, a);
413 	if (ARCHIVE_OK != archive_write_open_fd(a, bsdtar->fd))
414 		lafe_errc(1, 0, "%s", archive_error_string(a));
415 
416 	write_archive(a, bsdtar);
417 
418 	close(bsdtar->fd);
419 	bsdtar->fd = -1;
420 
421 	while (bsdtar->archive_dir->head != NULL) {
422 		p = bsdtar->archive_dir->head->next;
423 		free(bsdtar->archive_dir->head->name);
424 		free(bsdtar->archive_dir->head);
425 		bsdtar->archive_dir->head = p;
426 	}
427 	bsdtar->archive_dir->tail = NULL;
428 }
429 
430 
431 /*
432  * Write user-specified files/dirs to opened archive.
433  */
434 static void
435 write_archive(struct archive *a, struct bsdtar *bsdtar)
436 {
437 	const char *arg;
438 	struct archive_entry *entry, *sparse_entry;
439 
440 	/* Choose a suitable copy buffer size */
441 	bsdtar->buff_size = 64 * 1024;
442 	while (bsdtar->buff_size < (size_t)bsdtar->bytes_per_block)
443 	  bsdtar->buff_size *= 2;
444 	/* Try to compensate for space we'll lose to alignment. */
445 	bsdtar->buff_size += 16 * 1024;
446 
447 	/* Allocate a buffer for file data. */
448 	if ((bsdtar->buff = malloc(bsdtar->buff_size)) == NULL)
449 		lafe_errc(1, 0, "cannot allocate memory");
450 
451 	if ((bsdtar->resolver = archive_entry_linkresolver_new()) == NULL)
452 		lafe_errc(1, 0, "cannot create link resolver");
453 	archive_entry_linkresolver_set_strategy(bsdtar->resolver,
454 	    archive_format(a));
455 
456 	/* Create a read_disk object. */
457 	if ((bsdtar->diskreader = archive_read_disk_new()) == NULL)
458 		lafe_errc(1, 0, "Cannot create read_disk object");
459 	/* Tell the read_disk how handle symlink. */
460 	switch (bsdtar->symlink_mode) {
461 	case 'H':
462 		archive_read_disk_set_symlink_hybrid(bsdtar->diskreader);
463 		break;
464 	case 'L':
465 		archive_read_disk_set_symlink_logical(bsdtar->diskreader);
466 		break;
467 	default:
468 		archive_read_disk_set_symlink_physical(bsdtar->diskreader);
469 		break;
470 	}
471 	/* Register entry filters. */
472 	archive_read_disk_set_matching(bsdtar->diskreader,
473 	    bsdtar->matching, excluded_callback, bsdtar);
474 	archive_read_disk_set_metadata_filter_callback(
475 	    bsdtar->diskreader, metadata_filter, bsdtar);
476 	/* Set the behavior of archive_read_disk. */
477 	archive_read_disk_set_behavior(bsdtar->diskreader,
478 	    bsdtar->readdisk_flags);
479 	archive_read_disk_set_standard_lookup(bsdtar->diskreader);
480 
481 	if (bsdtar->names_from_file != NULL)
482 		archive_names_from_file(bsdtar, a);
483 
484 	while (*bsdtar->argv) {
485 		arg = *bsdtar->argv;
486 		if (arg[0] == '-' && arg[1] == 'C') {
487 			arg += 2;
488 			if (*arg == '\0') {
489 				bsdtar->argv++;
490 				arg = *bsdtar->argv;
491 				if (arg == NULL) {
492 					lafe_warnc(0, "%s",
493 					    "Missing argument for -C");
494 					bsdtar->return_value = 1;
495 					goto cleanup;
496 				}
497 				if (*arg == '\0') {
498 					lafe_warnc(0,
499 					    "Meaningless argument for -C: ''");
500 					bsdtar->return_value = 1;
501 					goto cleanup;
502 				}
503 			}
504 			set_chdir(bsdtar, arg);
505 		} else {
506 			if (*arg != '/')
507 				do_chdir(bsdtar); /* Handle a deferred -C */
508 			if (*arg == '@') {
509 				if (append_archive_filename(bsdtar, a,
510 				    arg + 1) != 0)
511 					break;
512 			} else
513 				write_hierarchy(bsdtar, a, arg);
514 		}
515 		bsdtar->argv++;
516 	}
517 
518 	archive_read_disk_set_matching(bsdtar->diskreader, NULL, NULL, NULL);
519 	archive_read_disk_set_metadata_filter_callback(
520 	    bsdtar->diskreader, NULL, NULL);
521 	entry = NULL;
522 	archive_entry_linkify(bsdtar->resolver, &entry, &sparse_entry);
523 	while (entry != NULL) {
524 		int r;
525 		struct archive_entry *entry2;
526 		struct archive *disk = bsdtar->diskreader;
527 
528 		/*
529 		 * This tricky code here is to correctly read the contents
530 		 * of the entry because the disk reader bsdtar->diskreader
531 		 * is pointing at does not have any information about the
532 		 * entry by this time and using archive_read_data_block()
533 		 * with the disk reader consequently must fail. And we
534 		 * have to re-open the entry to read the contents.
535 		 */
536 		/* TODO: Work with -C option as well. */
537 		r = archive_read_disk_open(disk,
538 			archive_entry_sourcepath(entry));
539 		if (r != ARCHIVE_OK) {
540 			lafe_warnc(archive_errno(disk),
541 			    "%s", archive_error_string(disk));
542 			bsdtar->return_value = 1;
543 			archive_entry_free(entry);
544 			continue;
545 		}
546 
547 		/*
548 		 * Invoke archive_read_next_header2() to work
549 		 * archive_read_data_block(), which is called via write_file(),
550 		 * without failure.
551 		 */
552 		entry2 = archive_entry_new();
553 		r = archive_read_next_header2(disk, entry2);
554 		archive_entry_free(entry2);
555 		if (r != ARCHIVE_OK) {
556 			lafe_warnc(archive_errno(disk),
557 			    "%s", archive_error_string(disk));
558 			if (r == ARCHIVE_FATAL)
559 				bsdtar->return_value = 1;
560 			else
561 				archive_read_close(disk);
562 			archive_entry_free(entry);
563 			continue;
564 		}
565 
566 		write_file(bsdtar, a, entry);
567 		archive_entry_free(entry);
568 		archive_read_close(disk);
569 		entry = NULL;
570 		archive_entry_linkify(bsdtar->resolver, &entry, &sparse_entry);
571 	}
572 
573 	if (archive_write_close(a)) {
574 		lafe_warnc(0, "%s", archive_error_string(a));
575 		bsdtar->return_value = 1;
576 	}
577 
578 cleanup:
579 	/* Free file data buffer. */
580 	free(bsdtar->buff);
581 	archive_entry_linkresolver_free(bsdtar->resolver);
582 	bsdtar->resolver = NULL;
583 	archive_read_free(bsdtar->diskreader);
584 	bsdtar->diskreader = NULL;
585 
586 	if (bsdtar->flags & OPTFLAG_TOTALS) {
587 		fprintf(stderr, "Total bytes written: %s\n",
588 		    tar_i64toa(archive_filter_bytes(a, -1)));
589 	}
590 
591 	archive_write_free(a);
592 }
593 
594 /*
595  * Archive names specified in file.
596  *
597  * Unless --null was specified, a line containing exactly "-C" will
598  * cause the next line to be a directory to pass to chdir().  If
599  * --null is specified, then a line "-C" is just another filename.
600  */
601 static void
602 archive_names_from_file(struct bsdtar *bsdtar, struct archive *a)
603 {
604 	struct lafe_line_reader *lr;
605 	const char *line;
606 
607 	bsdtar->next_line_is_dir = 0;
608 
609 	lr = lafe_line_reader(bsdtar->names_from_file,
610 	    (bsdtar->flags & OPTFLAG_NULL));
611 	while ((line = lafe_line_reader_next(lr)) != NULL) {
612 		if (bsdtar->next_line_is_dir) {
613 			if (*line != '\0')
614 				set_chdir(bsdtar, line);
615 			else {
616 				lafe_warnc(0,
617 				    "Meaningless argument for -C: ''");
618 				bsdtar->return_value = 1;
619 			}
620 			bsdtar->next_line_is_dir = 0;
621 		} else if (((bsdtar->flags & OPTFLAG_NULL) == 0) &&
622 		    strcmp(line, "-C") == 0)
623 			bsdtar->next_line_is_dir = 1;
624 		else {
625 			if (*line != '/')
626 				do_chdir(bsdtar); /* Handle a deferred -C */
627 			write_hierarchy(bsdtar, a, line);
628 		}
629 	}
630 	lafe_line_reader_free(lr);
631 	if (bsdtar->next_line_is_dir)
632 		lafe_errc(1, errno,
633 		    "Unexpected end of filename list; "
634 		    "directory expected after -C");
635 }
636 
637 /*
638  * Copy from specified archive to current archive.  Returns non-zero
639  * for write errors (which force us to terminate the entire archiving
640  * operation).  If there are errors reading the input archive, we set
641  * bsdtar->return_value but return zero, so the overall archiving
642  * operation will complete and return non-zero.
643  */
644 static int
645 append_archive_filename(struct bsdtar *bsdtar, struct archive *a,
646     const char *raw_filename)
647 {
648 	struct archive *ina;
649 	const char *filename = raw_filename;
650 	int rc;
651 
652 	if (strcmp(filename, "-") == 0)
653 		filename = NULL; /* Library uses NULL for stdio. */
654 
655 	ina = archive_read_new();
656 	archive_read_support_format_all(ina);
657 	archive_read_support_filter_all(ina);
658 	set_reader_options(bsdtar, ina);
659 	archive_read_set_options(ina, "mtree:checkfs");
660 	if (bsdtar->passphrase != NULL)
661 		rc = archive_read_add_passphrase(a, bsdtar->passphrase);
662 	else
663 		rc = archive_read_set_passphrase_callback(ina, bsdtar,
664 			&passphrase_callback);
665 	if (rc != ARCHIVE_OK)
666 		lafe_errc(1, 0, "%s", archive_error_string(a));
667 	if (archive_read_open_filename(ina, filename,
668 					bsdtar->bytes_per_block)) {
669 		lafe_warnc(0, "%s", archive_error_string(ina));
670 		bsdtar->return_value = 1;
671 		return (0);
672 	}
673 
674 	rc = append_archive(bsdtar, a, ina);
675 
676 	if (rc != ARCHIVE_OK) {
677 		lafe_warnc(0, "Error reading archive %s: %s",
678 		    raw_filename, archive_error_string(ina));
679 		bsdtar->return_value = 1;
680 	}
681 	archive_read_free(ina);
682 
683 	return (rc);
684 }
685 
686 static int
687 append_archive(struct bsdtar *bsdtar, struct archive *a, struct archive *ina)
688 {
689 	struct archive_entry *in_entry;
690 	int e;
691 
692 	while (ARCHIVE_OK == (e = archive_read_next_header(ina, &in_entry))) {
693 		if (archive_match_excluded(bsdtar->matching, in_entry))
694 			continue;
695 		if ((bsdtar->flags & OPTFLAG_INTERACTIVE) &&
696 		    !yes("copy '%s'", archive_entry_pathname(in_entry)))
697 			continue;
698 		if (bsdtar->verbose > 1) {
699 			safe_fprintf(stderr, "a ");
700 			list_item_verbose(bsdtar, stderr, in_entry);
701 		} else if (bsdtar->verbose > 0)
702 			safe_fprintf(stderr, "a %s",
703 			    archive_entry_pathname(in_entry));
704 		if (need_report())
705 			report_write(bsdtar, a, in_entry, 0);
706 
707 		e = archive_write_header(a, in_entry);
708 		if (e != ARCHIVE_OK) {
709 			if (!bsdtar->verbose)
710 				lafe_warnc(0, "%s: %s",
711 				    archive_entry_pathname(in_entry),
712 				    archive_error_string(a));
713 			else
714 				fprintf(stderr, ": %s", archive_error_string(a));
715 		}
716 		if (e == ARCHIVE_FATAL)
717 			exit(1);
718 
719 		if (e >= ARCHIVE_WARN) {
720 			if (archive_entry_size(in_entry) == 0)
721 				archive_read_data_skip(ina);
722 			else if (copy_file_data_block(bsdtar, a, ina, in_entry))
723 				exit(1);
724 		}
725 
726 		if (bsdtar->verbose)
727 			fprintf(stderr, "\n");
728 	}
729 
730 	return (e == ARCHIVE_EOF ? ARCHIVE_OK : e);
731 }
732 
733 /* Helper function to copy file to archive. */
734 static int
735 copy_file_data_block(struct bsdtar *bsdtar, struct archive *a,
736     struct archive *in_a, struct archive_entry *entry)
737 {
738 	size_t	bytes_read;
739 	ssize_t	bytes_written;
740 	int64_t	offset, progress = 0;
741 	char *null_buff = NULL;
742 	const void *buff;
743 	int r;
744 
745 	while ((r = archive_read_data_block(in_a, &buff,
746 	    &bytes_read, &offset)) == ARCHIVE_OK) {
747 		if (need_report())
748 			report_write(bsdtar, a, entry, progress);
749 
750 		if (offset > progress) {
751 			int64_t sparse = offset - progress;
752 			size_t ns;
753 
754 			if (null_buff == NULL) {
755 				null_buff = bsdtar->buff;
756 				memset(null_buff, 0, bsdtar->buff_size);
757 			}
758 
759 			while (sparse > 0) {
760 				if (sparse > (int64_t)bsdtar->buff_size)
761 					ns = bsdtar->buff_size;
762 				else
763 					ns = (size_t)sparse;
764 				bytes_written =
765 				    archive_write_data(a, null_buff, ns);
766 				if (bytes_written < 0) {
767 					/* Write failed; this is bad */
768 					lafe_warnc(0, "%s",
769 					     archive_error_string(a));
770 					return (-1);
771 				}
772 				if ((size_t)bytes_written < ns) {
773 					/* Write was truncated; warn but
774 					 * continue. */
775 					lafe_warnc(0,
776 					    "%s: Truncated write; file may "
777 					    "have grown while being archived.",
778 					    archive_entry_pathname(entry));
779 					return (0);
780 				}
781 				progress += bytes_written;
782 				sparse -= bytes_written;
783 			}
784 		}
785 
786 		bytes_written = archive_write_data(a, buff, bytes_read);
787 		if (bytes_written < 0) {
788 			/* Write failed; this is bad */
789 			lafe_warnc(0, "%s", archive_error_string(a));
790 			return (-1);
791 		}
792 		if ((size_t)bytes_written < bytes_read) {
793 			/* Write was truncated; warn but continue. */
794 			lafe_warnc(0,
795 			    "%s: Truncated write; file may have grown "
796 			    "while being archived.",
797 			    archive_entry_pathname(entry));
798 			return (0);
799 		}
800 		progress += bytes_written;
801 	}
802 	if (r < ARCHIVE_WARN) {
803 		lafe_warnc(archive_errno(a), "%s", archive_error_string(a));
804 		return (-1);
805 	}
806 	return (0);
807 }
808 
809 static void
810 excluded_callback(struct archive *a, void *_data, struct archive_entry *entry)
811 {
812 	struct bsdtar *bsdtar = (struct bsdtar *)_data;
813 
814 	if (bsdtar->flags & OPTFLAG_NO_SUBDIRS)
815 		return;
816 	if (!archive_read_disk_can_descend(a))
817 		return;
818 	if ((bsdtar->flags & OPTFLAG_INTERACTIVE) &&
819 	    !yes("add '%s'", archive_entry_pathname(entry)))
820 		return;
821 	archive_read_disk_descend(a);
822 }
823 
824 static int
825 metadata_filter(struct archive *a, void *_data, struct archive_entry *entry)
826 {
827 	struct bsdtar *bsdtar = (struct bsdtar *)_data;
828 
829 	/* XXX TODO: check whether this filesystem is
830 	 * synthetic and/or local.  Add a new
831 	 * --local-only option to skip non-local
832 	 * filesystems.  Skip synthetic filesystems
833 	 * regardless.
834 	 *
835 	 * The results should be cached, since
836 	 * tree.c doesn't usually visit a directory
837 	 * and the directory contents together.  A simple
838 	 * move-to-front list should perform quite well.
839 	 *
840 	 * Use archive_read_disk_current_filesystem_is_remote().
841 	 */
842 
843 	/*
844 	 * If the user vetoes this file/directory, skip it.
845 	 * We want this to be fairly late; if some other
846 	 * check would veto this file, we shouldn't bother
847 	 * the user with it.
848 	 */
849 	if ((bsdtar->flags & OPTFLAG_INTERACTIVE) &&
850 	    !yes("add '%s'", archive_entry_pathname(entry)))
851 		return (0);
852 
853 	/* Note: if user vetoes, we won't descend. */
854 	if (((bsdtar->flags & OPTFLAG_NO_SUBDIRS) == 0) &&
855 	    archive_read_disk_can_descend(a))
856 		archive_read_disk_descend(a);
857 
858 	return (1);
859 }
860 
861 /*
862  * Add the file or dir hierarchy named by 'path' to the archive
863  */
864 static void
865 write_hierarchy(struct bsdtar *bsdtar, struct archive *a, const char *path)
866 {
867 	struct archive *disk = bsdtar->diskreader;
868 	struct archive_entry *entry = NULL, *spare_entry = NULL;
869 	int r;
870 
871 	r = archive_read_disk_open(disk, path);
872 	if (r != ARCHIVE_OK) {
873 		lafe_warnc(archive_errno(disk),
874 		    "%s", archive_error_string(disk));
875 		bsdtar->return_value = 1;
876 		return;
877 	}
878 	bsdtar->first_fs = -1;
879 
880 	for (;;) {
881 		archive_entry_free(entry);
882 		entry = archive_entry_new();
883 		r = archive_read_next_header2(disk, entry);
884 		if (r == ARCHIVE_EOF)
885 			break;
886 		else if (r != ARCHIVE_OK) {
887 			lafe_warnc(archive_errno(disk),
888 			    "%s", archive_error_string(disk));
889 			if (r == ARCHIVE_FATAL || r == ARCHIVE_FAILED) {
890 				bsdtar->return_value = 1;
891 				archive_entry_free(entry);
892 				archive_read_close(disk);
893 				return;
894 			} else if (r < ARCHIVE_WARN)
895 				continue;
896 		}
897 
898 		if (bsdtar->uid >= 0) {
899 			archive_entry_set_uid(entry, bsdtar->uid);
900 			if (!bsdtar->uname)
901 				archive_entry_set_uname(entry,
902 				    archive_read_disk_uname(bsdtar->diskreader,
903 					bsdtar->uid));
904 		}
905 		if (bsdtar->gid >= 0) {
906 			archive_entry_set_gid(entry, bsdtar->gid);
907 			if (!bsdtar->gname)
908 				archive_entry_set_gname(entry,
909 				    archive_read_disk_gname(bsdtar->diskreader,
910 					bsdtar->gid));
911 		}
912 		if (bsdtar->uname)
913 			archive_entry_set_uname(entry, bsdtar->uname);
914 		if (bsdtar->gname)
915 			archive_entry_set_gname(entry, bsdtar->gname);
916 
917 		/*
918 		 * Rewrite the pathname to be archived.  If rewrite
919 		 * fails, skip the entry.
920 		 */
921 		if (edit_pathname(bsdtar, entry))
922 			continue;
923 
924 		/* Display entry as we process it. */
925 		if (bsdtar->verbose > 1) {
926 			safe_fprintf(stderr, "a ");
927 			list_item_verbose(bsdtar, stderr, entry);
928 		} else if (bsdtar->verbose > 0) {
929 		/* This format is required by SUSv2. */
930 			safe_fprintf(stderr, "a %s",
931 			    archive_entry_pathname(entry));
932 		}
933 
934 		/* Non-regular files get archived with zero size. */
935 		if (archive_entry_filetype(entry) != AE_IFREG)
936 			archive_entry_set_size(entry, 0);
937 
938 		archive_entry_linkify(bsdtar->resolver, &entry, &spare_entry);
939 
940 		while (entry != NULL) {
941 			write_file(bsdtar, a, entry);
942 			archive_entry_free(entry);
943 			entry = spare_entry;
944 			spare_entry = NULL;
945 		}
946 
947 		if (bsdtar->verbose)
948 			fprintf(stderr, "\n");
949 	}
950 	archive_entry_free(entry);
951 	archive_read_close(disk);
952 }
953 
954 /*
955  * Write a single file (or directory or other filesystem object) to
956  * the archive.
957  */
958 static void
959 write_file(struct bsdtar *bsdtar, struct archive *a,
960     struct archive_entry *entry)
961 {
962 	write_entry(bsdtar, a, entry);
963 }
964 
965 /*
966  * Write a single entry to the archive.
967  */
968 static void
969 write_entry(struct bsdtar *bsdtar, struct archive *a,
970     struct archive_entry *entry)
971 {
972 	int e;
973 
974 	e = archive_write_header(a, entry);
975 	if (e != ARCHIVE_OK) {
976 		if (bsdtar->verbose > 1) {
977 			safe_fprintf(stderr, "a ");
978 			list_item_verbose(bsdtar, stderr, entry);
979 			lafe_warnc(0, ": %s", archive_error_string(a));
980 		} else if (bsdtar->verbose > 0) {
981 			lafe_warnc(0, "%s: %s",
982 			    archive_entry_pathname(entry),
983 			    archive_error_string(a));
984 		} else
985 			fprintf(stderr, ": %s", archive_error_string(a));
986 	}
987 
988 	if (e == ARCHIVE_FATAL)
989 		exit(1);
990 
991 	/*
992 	 * If we opened a file earlier, write it out now.  Note that
993 	 * the format handler might have reset the size field to zero
994 	 * to inform us that the archive body won't get stored.  In
995 	 * that case, just skip the write.
996 	 */
997 	if (e >= ARCHIVE_WARN && archive_entry_size(entry) > 0) {
998 		if (copy_file_data_block(bsdtar, a, bsdtar->diskreader, entry))
999 			exit(1);
1000 	}
1001 }
1002 
1003 static void
1004 report_write(struct bsdtar *bsdtar, struct archive *a,
1005     struct archive_entry *entry, int64_t progress)
1006 {
1007 	uint64_t comp, uncomp;
1008 	int compression;
1009 
1010 	if (bsdtar->verbose)
1011 		fprintf(stderr, "\n");
1012 	comp = archive_filter_bytes(a, -1);
1013 	uncomp = archive_filter_bytes(a, 0);
1014 	fprintf(stderr, "In: %d files, %s bytes;",
1015 	    archive_file_count(a), tar_i64toa(uncomp));
1016 	if (comp >= uncomp)
1017 		compression = 0;
1018 	else
1019 		compression = (int)((uncomp - comp) * 100 / uncomp);
1020 	fprintf(stderr,
1021 	    " Out: %s bytes, compression %d%%\n",
1022 	    tar_i64toa(comp), compression);
1023 	/* Can't have two calls to tar_i64toa() pending, so split the output. */
1024 	safe_fprintf(stderr, "Current: %s (%s",
1025 	    archive_entry_pathname(entry),
1026 	    tar_i64toa(progress));
1027 	fprintf(stderr, "/%s bytes)\n",
1028 	    tar_i64toa(archive_entry_size(entry)));
1029 }
1030 
1031 static void
1032 test_for_append(struct bsdtar *bsdtar)
1033 {
1034 	struct stat s;
1035 
1036 	if (*bsdtar->argv == NULL && bsdtar->names_from_file == NULL)
1037 		lafe_errc(1, 0, "no files or directories specified");
1038 	if (bsdtar->filename == NULL)
1039 		lafe_errc(1, 0, "Cannot append to stdout.");
1040 
1041 	if (stat(bsdtar->filename, &s) != 0)
1042 		return;
1043 
1044 	if (!S_ISREG(s.st_mode) && !S_ISBLK(s.st_mode))
1045 		lafe_errc(1, 0,
1046 		    "Cannot append to %s: not a regular file.",
1047 		    bsdtar->filename);
1048 
1049 /* Is this an appropriate check here on Windows? */
1050 /*
1051 	if (GetFileType(handle) != FILE_TYPE_DISK)
1052 		lafe_errc(1, 0, "Cannot append");
1053 */
1054 
1055 }
1056