Sync with FreeBSD. This adds read-only support for zip and ISO9660.
[dragonfly.git] / contrib / bsdtar / write.c
1 /*-
2  * Copyright (c) 2003-2004 Tim Kientzle
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer
10  *    in this position and unchanged.
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 1.40 2005/04/24 05:53:37 kientzle Exp $");
29
30 #include <sys/stat.h>
31 #include <sys/types.h>
32 #ifdef HAVE_POSIX_ACL
33 #include <sys/acl.h>
34 #endif
35 #include <archive.h>
36 #include <archive_entry.h>
37 #include <errno.h>
38 #include <fcntl.h>
39 #include <fnmatch.h>
40 #include <grp.h>
41 #include <limits.h>
42 #include <pwd.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <unistd.h>
47 #ifdef __linux
48 #include <ext2fs/ext2_fs.h>
49 #include <sys/ioctl.h>
50 #endif
51
52 #include "bsdtar.h"
53 #include "tree.h"
54
55 /* Fixed size of uname/gname caches. */
56 #define name_cache_size 101
57
58 static const char * const NO_NAME = "(noname)";
59
60 /* Initial size of link cache. */
61 #define links_cache_initial_size 1024
62
63 struct archive_dir_entry {
64         struct archive_dir_entry        *next;
65         time_t                   mtime_sec;
66         int                      mtime_nsec;
67         char                    *name;
68 };
69
70 struct archive_dir {
71         struct archive_dir_entry *head, *tail;
72 };
73
74 struct links_cache {
75         unsigned long             number_entries;
76         size_t                    number_buckets;
77         struct links_entry      **buckets;
78 };
79
80 struct links_entry {
81         struct links_entry      *next;
82         struct links_entry      *previous;
83         int                      links;
84         dev_t                    dev;
85         ino_t                    ino;
86         char                    *name;
87 };
88
89 struct name_cache {
90         int     probes;
91         int     hits;
92         size_t  size;
93         struct {
94                 id_t id;
95                 const char *name;
96         } cache[name_cache_size];
97 };
98
99 static void              add_dir_list(struct bsdtar *bsdtar, const char *path,
100                              time_t mtime_sec, int mtime_nsec);
101 static int               append_archive(struct bsdtar *, struct archive *,
102                              const char *fname);
103 static void              archive_names_from_file(struct bsdtar *bsdtar,
104                              struct archive *a);
105 static int               archive_names_from_file_helper(struct bsdtar *bsdtar,
106                              const char *line);
107 static void              create_cleanup(struct bsdtar *);
108 static void              free_buckets(struct bsdtar *, struct links_cache *);
109 static void              free_cache(struct name_cache *cache);
110 static const char *      lookup_gname(struct bsdtar *bsdtar, gid_t gid);
111 static int               lookup_gname_helper(struct bsdtar *bsdtar,
112                              const char **name, id_t gid);
113 static void              lookup_hardlink(struct bsdtar *,
114                              struct archive_entry *entry, const struct stat *);
115 static const char *      lookup_uname(struct bsdtar *bsdtar, uid_t uid);
116 static int               lookup_uname_helper(struct bsdtar *bsdtar,
117                              const char **name, id_t uid);
118 static int               new_enough(struct bsdtar *, const char *path,
119                              const struct stat *);
120 static void              setup_acls(struct bsdtar *, struct archive_entry *,
121                              const char *path);
122 static void              test_for_append(struct bsdtar *);
123 static void              write_archive(struct archive *, struct bsdtar *);
124 static void              write_entry(struct bsdtar *, struct archive *,
125                              const struct stat *, const char *pathname,
126                              unsigned pathlen, const char *accpath);
127 static int               write_file_data(struct bsdtar *, struct archive *,
128                              int fd);
129 static void              write_hierarchy(struct bsdtar *, struct archive *,
130                              const char *);
131
132 void
133 tar_mode_c(struct bsdtar *bsdtar)
134 {
135         struct archive *a;
136         int r;
137
138         if (*bsdtar->argv == NULL && bsdtar->names_from_file == NULL)
139                 bsdtar_errc(bsdtar, 1, 0, "no files or directories specified");
140
141         a = archive_write_new();
142
143         /* Support any format that the library supports. */
144         if (bsdtar->create_format == NULL) {
145                 r = archive_write_set_format_pax_restricted(a);
146                 bsdtar->create_format = "pax restricted";
147         } else {
148                 r = archive_write_set_format_by_name(a, bsdtar->create_format);
149         }
150         if (r != ARCHIVE_OK) {
151                 fprintf(stderr, "Can't use format %s: %s\n",
152                     bsdtar->create_format,
153                     archive_error_string(a));
154                 usage(bsdtar);
155         }
156
157         /*
158          * If user explicitly set the block size, then assume they
159          * want the last block padded as well.  Otherwise, use the
160          * default block size and accept archive_write_open_file()'s
161          * default padding decisions.
162          */
163         if (bsdtar->bytes_per_block != 0) {
164                 archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block);
165                 archive_write_set_bytes_in_last_block(a,
166                     bsdtar->bytes_per_block);
167         } else
168                 archive_write_set_bytes_per_block(a, DEFAULT_BYTES_PER_BLOCK);
169
170         switch (bsdtar->create_compression) {
171         case 0:
172                 break;
173 #ifdef HAVE_LIBBZ2
174         case 'j': case 'y':
175                 archive_write_set_compression_bzip2(a);
176                 break;
177 #endif
178 #ifdef HAVE_LIBZ
179         case 'z':
180                 archive_write_set_compression_gzip(a);
181                 break;
182 #endif
183         default:
184                 bsdtar_errc(bsdtar, 1, 0,
185                     "Unrecognized compression option -%c",
186                     bsdtar->create_compression);
187         }
188
189         r = archive_write_open_file(a, bsdtar->filename);
190         if (r != ARCHIVE_OK)
191                 bsdtar_errc(bsdtar, 1, 0, archive_error_string(a));
192
193         write_archive(a, bsdtar);
194
195         if (bsdtar->option_totals) {
196                 fprintf(stderr, "Total bytes written: " BSDTAR_FILESIZE_PRINTF "\n",
197                     (BSDTAR_FILESIZE_TYPE)archive_position_compressed(a));
198         }
199
200         archive_write_finish(a);
201 }
202
203 /*
204  * Same as 'c', except we only support tar formats in uncompressed
205  * files on disk.
206  */
207 void
208 tar_mode_r(struct bsdtar *bsdtar)
209 {
210         off_t   end_offset;
211         int     format;
212         struct archive *a;
213         struct archive_entry *entry;
214
215         /* Sanity-test some arguments and the file. */
216         test_for_append(bsdtar);
217
218         format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;
219
220         bsdtar->fd = open(bsdtar->filename, O_RDWR);
221         if (bsdtar->fd < 0)
222                 bsdtar_errc(bsdtar, 1, errno,
223                     "Cannot open %s", bsdtar->filename);
224
225         a = archive_read_new();
226         archive_read_support_compression_all(a);
227         archive_read_support_format_tar(a);
228         archive_read_support_format_gnutar(a);
229         archive_read_open_fd(a, bsdtar->fd, 10240);
230         while (0 == archive_read_next_header(a, &entry)) {
231                 if (archive_compression(a) != ARCHIVE_COMPRESSION_NONE) {
232                         archive_read_finish(a);
233                         close(bsdtar->fd);
234                         bsdtar_errc(bsdtar, 1, 0,
235                             "Cannot append to compressed archive.");
236                 }
237                 /* Keep going until we hit end-of-archive */
238                 format = archive_format(a);
239         }
240
241         end_offset = archive_read_header_position(a);
242         archive_read_finish(a);
243
244         /* Re-open archive for writing */
245         a = archive_write_new();
246         archive_write_set_compression_none(a);
247         /*
248          * Set format to same one auto-detected above, except use
249          * ustar for appending to GNU tar, since the library doesn't
250          * write GNU tar format.
251          */
252         if (format == ARCHIVE_FORMAT_TAR_GNUTAR)
253                 format = ARCHIVE_FORMAT_TAR_USTAR;
254         archive_write_set_format(a, format);
255         lseek(bsdtar->fd, end_offset, SEEK_SET); /* XXX check return val XXX */
256         archive_write_open_fd(a, bsdtar->fd); /* XXX check return val XXX */
257
258         write_archive(a, bsdtar); /* XXX check return val XXX */
259
260         if (bsdtar->option_totals) {
261                 fprintf(stderr, "Total bytes written: " BSDTAR_FILESIZE_PRINTF "\n",
262                     (BSDTAR_FILESIZE_TYPE)archive_position_compressed(a));
263         }
264
265         archive_write_finish(a);
266         close(bsdtar->fd);
267         bsdtar->fd = -1;
268 }
269
270 void
271 tar_mode_u(struct bsdtar *bsdtar)
272 {
273         off_t                    end_offset;
274         struct archive          *a;
275         struct archive_entry    *entry;
276         const char              *filename;
277         int                      format;
278         struct archive_dir_entry        *p;
279         struct archive_dir       archive_dir;
280
281         bsdtar->archive_dir = &archive_dir;
282         memset(&archive_dir, 0, sizeof(archive_dir));
283
284         filename = NULL;
285         format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED;
286
287         /* Sanity-test some arguments and the file. */
288         test_for_append(bsdtar);
289
290         bsdtar->fd = open(bsdtar->filename, O_RDWR);
291         if (bsdtar->fd < 0)
292                 bsdtar_errc(bsdtar, 1, errno,
293                     "Cannot open %s", bsdtar->filename);
294
295         a = archive_read_new();
296         archive_read_support_compression_all(a);
297         archive_read_support_format_tar(a);
298         archive_read_support_format_gnutar(a);
299         archive_read_open_fd(a, bsdtar->fd,
300             bsdtar->bytes_per_block != 0 ? bsdtar->bytes_per_block :
301             DEFAULT_BYTES_PER_BLOCK);
302
303         /* Build a list of all entries and their recorded mod times. */
304         while (0 == archive_read_next_header(a, &entry)) {
305                 if (archive_compression(a) != ARCHIVE_COMPRESSION_NONE) {
306                         archive_read_finish(a);
307                         close(bsdtar->fd);
308                         bsdtar_errc(bsdtar, 1, 0,
309                             "Cannot append to compressed archive.");
310                 }
311                 add_dir_list(bsdtar, archive_entry_pathname(entry),
312                     archive_entry_mtime(entry),
313                     archive_entry_mtime_nsec(entry));
314                 /* Record the last format determination we see */
315                 format = archive_format(a);
316                 /* Keep going until we hit end-of-archive */
317         }
318
319         end_offset = archive_read_header_position(a);
320         archive_read_finish(a);
321
322         /* Re-open archive for writing. */
323         a = archive_write_new();
324         archive_write_set_compression_none(a);
325         /*
326          * Set format to same one auto-detected above, except that
327          * we don't write GNU tar format, so use ustar instead.
328          */
329         if (format == ARCHIVE_FORMAT_TAR_GNUTAR)
330                 format = ARCHIVE_FORMAT_TAR_USTAR;
331         archive_write_set_format(a, format);
332         if (bsdtar->bytes_per_block != 0) {
333                 archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block);
334                 archive_write_set_bytes_in_last_block(a,
335                     bsdtar->bytes_per_block);
336         } else
337                 archive_write_set_bytes_per_block(a, DEFAULT_BYTES_PER_BLOCK);
338         lseek(bsdtar->fd, end_offset, SEEK_SET);
339         ftruncate(bsdtar->fd, end_offset);
340         archive_write_open_fd(a, bsdtar->fd);
341
342         write_archive(a, bsdtar);
343
344         if (bsdtar->option_totals) {
345                 fprintf(stderr, "Total bytes written: " BSDTAR_FILESIZE_PRINTF "\n",
346                     (BSDTAR_FILESIZE_TYPE)archive_position_compressed(a));
347         }
348
349         archive_write_finish(a);
350         close(bsdtar->fd);
351         bsdtar->fd = -1;
352
353         while (bsdtar->archive_dir->head != NULL) {
354                 p = bsdtar->archive_dir->head->next;
355                 free(bsdtar->archive_dir->head->name);
356                 free(bsdtar->archive_dir->head);
357                 bsdtar->archive_dir->head = p;
358         }
359         bsdtar->archive_dir->tail = NULL;
360 }
361
362
363 /*
364  * Write user-specified files/dirs to opened archive.
365  */
366 static void
367 write_archive(struct archive *a, struct bsdtar *bsdtar)
368 {
369         const char *arg;
370
371         if (bsdtar->names_from_file != NULL)
372                 archive_names_from_file(bsdtar, a);
373
374         while (*bsdtar->argv) {
375                 arg = *bsdtar->argv;
376                 if (arg[0] == '-' && arg[1] == 'C') {
377                         arg += 2;
378                         if (*arg == '\0') {
379                                 bsdtar->argv++;
380                                 arg = *bsdtar->argv;
381                                 if (arg == NULL) {
382                                         bsdtar_warnc(bsdtar, 1, 0,
383                                             "Missing argument for -C");
384                                         bsdtar->return_value = 1;
385                                         return;
386                                 }
387                         }
388                         set_chdir(bsdtar, arg);
389                 } else {
390                         if (*arg != '/' || (arg[0] == '@' && arg[1] != '/'))
391                                 do_chdir(bsdtar); /* Handle a deferred -C */
392                         if (*arg == '@') {
393                                 if (append_archive(bsdtar, a, arg + 1) != 0)
394                                         break;
395                         } else
396                                 write_hierarchy(bsdtar, a, arg);
397                 }
398                 bsdtar->argv++;
399         }
400
401         create_cleanup(bsdtar);
402         archive_write_close(a);
403 }
404
405 /*
406  * Archive names specified in file.
407  *
408  * Unless --null was specified, a line containing exactly "-C" will
409  * cause the next line to be a directory to pass to chdir().  If
410  * --null is specified, then a line "-C" is just another filename.
411  */
412 void
413 archive_names_from_file(struct bsdtar *bsdtar, struct archive *a)
414 {
415         bsdtar->archive = a;
416
417         bsdtar->next_line_is_dir = 0;
418         process_lines(bsdtar, bsdtar->names_from_file,
419             archive_names_from_file_helper);
420         if (bsdtar->next_line_is_dir)
421                 bsdtar_errc(bsdtar, 1, errno,
422                     "Unexpected end of filename list; "
423                     "directory expected after -C");
424 }
425
426 static int
427 archive_names_from_file_helper(struct bsdtar *bsdtar, const char *line)
428 {
429         if (bsdtar->next_line_is_dir) {
430                 set_chdir(bsdtar, line);
431                 bsdtar->next_line_is_dir = 0;
432         } else if (!bsdtar->option_null && strcmp(line, "-C") == 0)
433                 bsdtar->next_line_is_dir = 1;
434         else {
435                 if (*line != '/')
436                         do_chdir(bsdtar); /* Handle a deferred -C */
437                 write_hierarchy(bsdtar, bsdtar->archive, line);
438         }
439         return (0);
440 }
441
442 /*
443  * Copy from specified archive to current archive.
444  * Returns non-zero on fatal error (i.e., output errors).  Errors
445  * reading the input archive set bsdtar->return_value, but this
446  * function will still return zero.
447  */
448 static int
449 append_archive(struct bsdtar *bsdtar, struct archive *a, const char *filename)
450 {
451         struct archive *ina;
452         struct archive_entry *in_entry;
453         int bytes_read, bytes_written;
454         char buff[8192];
455
456         if (strcmp(filename, "-") == 0)
457                 filename = NULL; /* Library uses NULL for stdio. */
458
459         ina = archive_read_new();
460         archive_read_support_format_all(ina);
461         archive_read_support_compression_all(ina);
462         if (archive_read_open_file(ina, filename, 10240)) {
463                 bsdtar_warnc(bsdtar, 0, "%s", archive_error_string(ina));
464                 bsdtar->return_value = 1;
465                 return (0);
466         }
467         while (0 == archive_read_next_header(ina, &in_entry)) {
468                 if (!new_enough(bsdtar, archive_entry_pathname(in_entry),
469                         archive_entry_stat(in_entry)))
470                         continue;
471                 if (excluded(bsdtar, archive_entry_pathname(in_entry)))
472                         continue;
473                 if (bsdtar->option_interactive &&
474                     !yes("copy '%s'", archive_entry_pathname(in_entry)))
475                         continue;
476                 if (bsdtar->verbose)
477                         safe_fprintf(stderr, "a %s",
478                             archive_entry_pathname(in_entry));
479                 /* XXX handle/report errors XXX */
480                 if (archive_write_header(a, in_entry)) {
481                         bsdtar_warnc(bsdtar, 0, "%s",
482                             archive_error_string(ina));
483                         bsdtar->return_value = 1;
484                         return (-1);
485                 }
486                 bytes_read = archive_read_data(ina, buff, sizeof(buff));
487                 while (bytes_read > 0) {
488                         bytes_written =
489                             archive_write_data(a, buff, bytes_read);
490                         if (bytes_written < bytes_read) {
491                                 bsdtar_warnc(bsdtar, archive_errno(a), "%s",
492                                     archive_error_string(a));
493                                 return (-1);
494                         }
495                         bytes_read =
496                             archive_read_data(ina, buff, sizeof(buff));
497                 }
498                 if (bsdtar->verbose)
499                         fprintf(stderr, "\n");
500
501         }
502         if (archive_errno(ina)) {
503                 bsdtar_warnc(bsdtar, 0, "Error reading archive %s: %s",
504                     filename, archive_error_string(ina));
505                 bsdtar->return_value = 1;
506         }
507
508         return (0); /* TODO: Return non-zero on error */
509 }
510
511 /*
512  * Add the file or dir hierarchy named by 'path' to the archive
513  */
514 static void
515 write_hierarchy(struct bsdtar *bsdtar, struct archive *a, const char *path)
516 {
517         struct tree *tree;
518         char symlink_mode = bsdtar->symlink_mode;
519         dev_t first_dev = 0;
520         int dev_recorded = 0;
521         int tree_ret;
522 #ifdef __linux
523         int      fd, r;
524         unsigned long fflags;
525 #endif
526
527         tree = tree_open(path);
528
529         if (!tree) {
530                 bsdtar_warnc(bsdtar, errno, "%s: Cannot open", path);
531                 bsdtar->return_value = 1;
532                 return;
533         }
534
535         while ((tree_ret = tree_next(tree))) {
536                 const char *name = tree_current_path(tree);
537                 const struct stat *st = NULL, *lst = NULL;
538                 int descend;
539
540                 if (tree_ret == TREE_ERROR)
541                         bsdtar_warnc(bsdtar, errno, "%s", name);
542                 if (tree_ret != TREE_REGULAR)
543                         continue;
544                 lst = tree_current_lstat(tree);
545                 if (lst == NULL) {
546                         /* Couldn't lstat(); must not exist. */
547                         bsdtar_warnc(bsdtar, errno, "%s: Cannot open", path);
548                         bsdtar->return_value = 1;
549                         continue;
550                 }
551                 if (S_ISLNK(lst->st_mode))
552                         st = tree_current_stat(tree);
553                 /* Default: descend into any dir or symlink to dir. */
554                 /* We'll adjust this later on. */
555                 descend = 0;
556                 if ((st != NULL) && S_ISDIR(st->st_mode))
557                         descend = 1;
558                 if ((lst != NULL) && S_ISDIR(lst->st_mode))
559                         descend = 1;
560
561                 /*
562                  * If user has asked us not to cross mount points,
563                  * then don't descend into into a dir on a different
564                  * device.
565                  */
566                 if (!dev_recorded) {
567                         first_dev = lst->st_dev;
568                         dev_recorded = 1;
569                 }
570                 if (bsdtar->option_dont_traverse_mounts) {
571                         if (lst != NULL && lst->st_dev != first_dev)
572                                 descend = 0;
573                 }
574
575                 /*
576                  * If this file/dir is flagged "nodump" and we're
577                  * honoring such flags, skip this file/dir.
578                  */
579 #ifdef HAVE_CHFLAGS
580                 if (bsdtar->option_honor_nodump &&
581                     (lst->st_flags & UF_NODUMP))
582                         continue;
583 #endif
584
585 #ifdef __linux
586                 /*
587                  * Linux has a nodump flag too but to read it
588                  * we have to open() the file/dir and do an ioctl on it...
589                  */
590                 if (bsdtar->option_honor_nodump &&
591                     ((fd = open(name, O_RDONLY|O_NONBLOCK)) >= 0) &&
592                     ((r = ioctl(fd, EXT2_IOC_GETFLAGS, &fflags)),
593                         close(fd), r) >= 0 &&
594                     (fflags & EXT2_NODUMP_FL))
595                         continue;
596 #endif
597
598                 /*
599                  * If this file/dir is excluded by a filename
600                  * pattern, skip it.
601                  */
602                 if (excluded(bsdtar, name))
603                         continue;
604
605                 /*
606                  * If the user vetoes this file/directory, skip it.
607                  */
608                 if (bsdtar->option_interactive &&
609                     !yes("add '%s'", name))
610                         continue;
611
612                 /*
613                  * If this is a dir, decide whether or not to recurse.
614                  */
615                 if (bsdtar->option_no_subdirs)
616                         descend = 0;
617
618                 /*
619                  * Distinguish 'L'/'P'/'H' symlink following.
620                  */
621                 switch(symlink_mode) {
622                 case 'H':
623                         /* 'H': First item (from command line) like 'L'. */
624                         lst = tree_current_stat(tree);
625                         /* 'H': After the first item, rest like 'P'. */
626                         symlink_mode = 'P';
627                         break;
628                 case 'L':
629                         /* 'L': Do descend through a symlink to dir. */
630                         /* 'L': Archive symlink to file as file. */
631                         lst = tree_current_stat(tree);
632                         break;
633                 default:
634                         /* 'P': Don't descend through a symlink to dir. */
635                         if (!S_ISDIR(lst->st_mode))
636                                 descend = 0;
637                         /* 'P': Archive symlink to file as symlink. */
638                         /* lst = tree_current_lstat(tree); */
639                         break;
640                 }
641
642                 if (descend)
643                         tree_descend(tree);
644
645                 /*
646                  * In -u mode, we need to check whether this
647                  * is newer than what's already in the archive.
648                  * In all modes, we need to obey --newerXXX flags.
649                  */
650                 if (new_enough(bsdtar, name, lst)) {
651                         write_entry(bsdtar, a, lst, name,
652                             tree_current_pathlen(tree),
653                             tree_current_access_path(tree));
654                 }
655         }
656         tree_close(tree);
657 }
658
659 /*
660  * Add a single filesystem object to the archive.
661  */
662 static void
663 write_entry(struct bsdtar *bsdtar, struct archive *a, const struct stat *st,
664     const char *pathname, unsigned pathlen, const char *accpath)
665 {
666         struct archive_entry    *entry;
667         int                      e;
668         int                      fd;
669 #ifdef __linux
670         int                      r;
671         unsigned long            stflags;
672 #endif
673         static char              linkbuffer[PATH_MAX+1];
674
675         (void)pathlen; /* UNUSED */
676
677         fd = -1;
678         entry = archive_entry_new();
679
680         archive_entry_set_pathname(entry, pathname);
681
682         /*
683          * Rewrite the pathname to be archived.  If rewrite
684          * fails, skip the entry.
685          */
686         if (edit_pathname(bsdtar, entry))
687                 goto abort;
688
689         if (!S_ISDIR(st->st_mode) && (st->st_nlink > 1))
690                 lookup_hardlink(bsdtar, entry, st);
691
692         /* Display entry as we process it. This format is required by SUSv2. */
693         if (bsdtar->verbose)
694                 safe_fprintf(stderr, "a %s", archive_entry_pathname(entry));
695
696         /* Read symbolic link information. */
697         if ((st->st_mode & S_IFMT) == S_IFLNK) {
698                 int lnklen;
699
700                 lnklen = readlink(accpath, linkbuffer, PATH_MAX);
701                 if (lnklen < 0) {
702                         if (!bsdtar->verbose)
703                                 bsdtar_warnc(bsdtar, errno,
704                                     "%s: Couldn't read symbolic link",
705                                     pathname);
706                         else
707                                 safe_fprintf(stderr,
708                                     ": Couldn't read symbolic link: %s",
709                                     strerror(errno));
710                         goto cleanup;
711                 }
712                 linkbuffer[lnklen] = 0;
713                 archive_entry_set_symlink(entry, linkbuffer);
714         }
715
716         /* Look up username and group name. */
717         archive_entry_set_uname(entry, lookup_uname(bsdtar, st->st_uid));
718         archive_entry_set_gname(entry, lookup_gname(bsdtar, st->st_gid));
719
720 #ifdef HAVE_CHFLAGS
721         if (st->st_flags != 0)
722                 archive_entry_set_fflags(entry, st->st_flags, 0);
723 #endif
724
725 #ifdef __linux
726         if ((S_ISREG(st->st_mode) || S_ISDIR(st->st_mode)) &&
727             ((fd = open(accpath, O_RDONLY|O_NONBLOCK)) >= 0) &&
728             ((r = ioctl(fd, EXT2_IOC_GETFLAGS, &stflags)), close(fd), (fd = -1), r) >= 0 &&
729             stflags) {
730                 archive_entry_set_fflags(entry, stflags, 0);
731         }
732 #endif
733
734         archive_entry_copy_stat(entry, st);
735         setup_acls(bsdtar, entry, accpath);
736
737         /*
738          * If it's a regular file (and non-zero in size) make sure we
739          * can open it before we start to write.  In particular, note
740          * that we can always archive a zero-length file, even if we
741          * can't read it.
742          */
743         if (S_ISREG(st->st_mode) && st->st_size > 0) {
744                 fd = open(accpath, O_RDONLY);
745                 if (fd < 0) {
746                         if (!bsdtar->verbose)
747                                 bsdtar_warnc(bsdtar, errno, "%s", pathname);
748                         else
749                                 fprintf(stderr, ": %s", strerror(errno));
750                         goto cleanup;
751                 }
752         }
753
754         /* Non-regular files get archived with zero size. */
755         if (!S_ISREG(st->st_mode))
756                 archive_entry_set_size(entry, 0);
757
758         e = archive_write_header(a, entry);
759         if (e != ARCHIVE_OK) {
760                 if (!bsdtar->verbose)
761                         bsdtar_warnc(bsdtar, 0, "%s: %s", pathname,
762                             archive_error_string(a));
763                 else
764                         fprintf(stderr, ": %s", archive_error_string(a));
765         }
766
767         if (e == ARCHIVE_FATAL)
768                 exit(1);
769
770         /*
771          * If we opened a file earlier, write it out now.  Note that
772          * the format handler might have reset the size field to zero
773          * to inform us that the archive body won't get stored.  In
774          * that case, just skip the write.
775          */
776         if (fd >= 0 && archive_entry_size(entry) > 0)
777                 write_file_data(bsdtar, a, fd);
778
779 cleanup:
780         if (bsdtar->verbose)
781                 fprintf(stderr, "\n");
782
783 abort:
784         if (fd >= 0)
785                 close(fd);
786
787         if (entry != NULL)
788                 archive_entry_free(entry);
789 }
790
791
792 /* Helper function to copy file to archive, with stack-allocated buffer. */
793 static int
794 write_file_data(struct bsdtar *bsdtar, struct archive *a, int fd)
795 {
796         char    buff[64*1024];
797         ssize_t bytes_read;
798         ssize_t bytes_written;
799
800         /* XXX TODO: Allocate buffer on heap and store pointer to
801          * it in bsdtar structure; arrange cleanup as well. XXX */
802         (void)bsdtar;
803
804         bytes_read = read(fd, buff, sizeof(buff));
805         while (bytes_read > 0) {
806                 bytes_written = archive_write_data(a, buff, bytes_read);
807                 if (bytes_written <= 0)
808                         return (-1); /* Write failed; this is bad */
809                 bytes_read = read(fd, buff, sizeof(buff));
810         }
811         return 0;
812 }
813
814
815 static void
816 create_cleanup(struct bsdtar *bsdtar)
817 {
818         /* Free inode->pathname map used for hardlink detection. */
819         if (bsdtar->links_cache != NULL) {
820                 free_buckets(bsdtar, bsdtar->links_cache);
821                 free(bsdtar->links_cache);
822                 bsdtar->links_cache = NULL;
823         }
824
825         free_cache(bsdtar->uname_cache);
826         bsdtar->uname_cache = NULL;
827         free_cache(bsdtar->gname_cache);
828         bsdtar->gname_cache = NULL;
829 }
830
831
832 static void
833 free_buckets(struct bsdtar *bsdtar, struct links_cache *links_cache)
834 {
835         size_t i;
836
837         if (links_cache->buckets == NULL)
838                 return;
839
840         for (i = 0; i < links_cache->number_buckets; i++) {
841                 while (links_cache->buckets[i] != NULL) {
842                         struct links_entry *lp = links_cache->buckets[i]->next;
843                         if (bsdtar->option_warn_links)
844                                 bsdtar_warnc(bsdtar, 0, "Missing links to %s",
845                                     links_cache->buckets[i]->name);
846                         if (links_cache->buckets[i]->name != NULL)
847                                 free(links_cache->buckets[i]->name);
848                         free(links_cache->buckets[i]);
849                         links_cache->buckets[i] = lp;
850                 }
851         }
852         free(links_cache->buckets);
853         links_cache->buckets = NULL;
854 }
855
856 static void
857 lookup_hardlink(struct bsdtar *bsdtar, struct archive_entry *entry,
858     const struct stat *st)
859 {
860         struct links_cache      *links_cache;
861         struct links_entry      *le, **new_buckets;
862         int                      hash;
863         size_t                   i, new_size;
864
865         /* If necessary, initialize the links cache. */
866         links_cache = bsdtar->links_cache;
867         if (links_cache == NULL) {
868                 bsdtar->links_cache = malloc(sizeof(struct links_cache));
869                 if (bsdtar->links_cache == NULL)
870                         bsdtar_errc(bsdtar, 1, ENOMEM,
871                             "No memory for hardlink detection.");
872                 links_cache = bsdtar->links_cache;
873                 memset(links_cache, 0, sizeof(struct links_cache));
874                 links_cache->number_buckets = links_cache_initial_size;
875                 links_cache->buckets = malloc(links_cache->number_buckets *
876                     sizeof(links_cache->buckets[0]));
877                 if (links_cache->buckets == NULL) {
878                         bsdtar_errc(bsdtar, 1, ENOMEM,
879                             "No memory for hardlink detection.");
880                 }
881                 for (i = 0; i < links_cache->number_buckets; i++)
882                         links_cache->buckets[i] = NULL;
883         }
884
885         /* If the links cache overflowed and got flushed, don't bother. */
886         if (links_cache->buckets == NULL)
887                 return;
888
889         /* If the links cache is getting too full, enlarge the hash table. */
890         if (links_cache->number_entries > links_cache->number_buckets * 2)
891         {
892                 int count;
893
894                 new_size = links_cache->number_buckets * 2;
895                 new_buckets = malloc(new_size * sizeof(struct links_entry *));
896
897                 count = 0;
898
899                 if (new_buckets != NULL) {
900                         memset(new_buckets, 0,
901                             new_size * sizeof(struct links_entry *));
902                         for (i = 0; i < links_cache->number_buckets; i++) {
903                                 while (links_cache->buckets[i] != NULL) {
904                                         /* Remove entry from old bucket. */
905                                         le = links_cache->buckets[i];
906                                         links_cache->buckets[i] = le->next;
907
908                                         /* Add entry to new bucket. */
909                                         hash = (le->dev ^ le->ino) % new_size;
910
911                                         if (new_buckets[hash] != NULL)
912                                                 new_buckets[hash]->previous =
913                                                     le;
914                                         le->next = new_buckets[hash];
915                                         le->previous = NULL;
916                                         new_buckets[hash] = le;
917                                 }
918                         }
919                         free(links_cache->buckets);
920                         links_cache->buckets = new_buckets;
921                         links_cache->number_buckets = new_size;
922                 } else {
923                         free_buckets(bsdtar, links_cache);
924                         bsdtar_warnc(bsdtar, ENOMEM,
925                             "No more memory for recording hard links");
926                         bsdtar_warnc(bsdtar, 0,
927                             "Remaining links will be dumped as full files");
928                 }
929         }
930
931         /* Try to locate this entry in the links cache. */
932         hash = ( st->st_dev ^ st->st_ino ) % links_cache->number_buckets;
933         for (le = links_cache->buckets[hash]; le != NULL; le = le->next) {
934                 if (le->dev == st->st_dev && le->ino == st->st_ino) {
935                         archive_entry_copy_hardlink(entry, le->name);
936
937                         /*
938                          * Decrement link count each time and release
939                          * the entry if it hits zero.  This saves
940                          * memory and is necessary for proper -l
941                          * implementation.
942                          */
943                         if (--le->links <= 0) {
944                                 if (le->previous != NULL)
945                                         le->previous->next = le->next;
946                                 if (le->next != NULL)
947                                         le->next->previous = le->previous;
948                                 if (le->name != NULL)
949                                         free(le->name);
950                                 if (links_cache->buckets[hash] == le)
951                                         links_cache->buckets[hash] = le->next;
952                                 links_cache->number_entries--;
953                                 free(le);
954                         }
955
956                         return;
957                 }
958         }
959
960         /* Add this entry to the links cache. */
961         le = malloc(sizeof(struct links_entry));
962         if (le != NULL)
963                 le->name = strdup(archive_entry_pathname(entry));
964         if ((le == NULL) || (le->name == NULL)) {
965                 free_buckets(bsdtar, links_cache);
966                 bsdtar_warnc(bsdtar, ENOMEM,
967                     "No more memory for recording hard links");
968                 bsdtar_warnc(bsdtar, 0,
969                     "Remaining hard links will be dumped as full files");
970                 if (le != NULL)
971                         free(le);
972                 return;
973         }
974         if (links_cache->buckets[hash] != NULL)
975                 links_cache->buckets[hash]->previous = le;
976         links_cache->number_entries++;
977         le->next = links_cache->buckets[hash];
978         le->previous = NULL;
979         links_cache->buckets[hash] = le;
980         le->dev = st->st_dev;
981         le->ino = st->st_ino;
982         le->links = st->st_nlink - 1;
983 }
984
985 #ifdef HAVE_POSIX_ACL
986 void                    setup_acl(struct bsdtar *bsdtar,
987                              struct archive_entry *entry, const char *accpath,
988                              int acl_type, int archive_entry_acl_type);
989
990 void
991 setup_acls(struct bsdtar *bsdtar, struct archive_entry *entry,
992     const char *accpath)
993 {
994         archive_entry_acl_clear(entry);
995
996         setup_acl(bsdtar, entry, accpath,
997             ACL_TYPE_ACCESS, ARCHIVE_ENTRY_ACL_TYPE_ACCESS);
998         /* Only directories can have default ACLs. */
999         if (S_ISDIR(archive_entry_mode(entry)))
1000                 setup_acl(bsdtar, entry, accpath,
1001                     ACL_TYPE_DEFAULT, ARCHIVE_ENTRY_ACL_TYPE_DEFAULT);
1002 }
1003
1004 void
1005 setup_acl(struct bsdtar *bsdtar, struct archive_entry *entry,
1006     const char *accpath, int acl_type, int archive_entry_acl_type)
1007 {
1008         acl_t            acl;
1009         acl_tag_t        acl_tag;
1010         acl_entry_t      acl_entry;
1011         acl_permset_t    acl_permset;
1012         int              s, ae_id, ae_tag, ae_perm;
1013         const char      *ae_name;
1014
1015         /* Retrieve access ACL from file. */
1016         acl = acl_get_file(accpath, acl_type);
1017         if (acl != NULL) {
1018                 s = acl_get_entry(acl, ACL_FIRST_ENTRY, &acl_entry);
1019                 while (s == 1) {
1020                         ae_id = -1;
1021                         ae_name = NULL;
1022
1023                         acl_get_tag_type(acl_entry, &acl_tag);
1024                         if (acl_tag == ACL_USER) {
1025                                 ae_id = (int)*(uid_t *)acl_get_qualifier(acl_entry);
1026                                 ae_name = lookup_uname(bsdtar, ae_id);
1027                                 ae_tag = ARCHIVE_ENTRY_ACL_USER;
1028                         } else if (acl_tag == ACL_GROUP) {
1029                                 ae_id = (int)*(gid_t *)acl_get_qualifier(acl_entry);
1030                                 ae_name = lookup_gname(bsdtar, ae_id);
1031                                 ae_tag = ARCHIVE_ENTRY_ACL_GROUP;
1032                         } else if (acl_tag == ACL_MASK) {
1033                                 ae_tag = ARCHIVE_ENTRY_ACL_MASK;
1034                         } else if (acl_tag == ACL_USER_OBJ) {
1035                                 ae_tag = ARCHIVE_ENTRY_ACL_USER_OBJ;
1036                         } else if (acl_tag == ACL_GROUP_OBJ) {
1037                                 ae_tag = ARCHIVE_ENTRY_ACL_GROUP_OBJ;
1038                         } else if (acl_tag == ACL_OTHER) {
1039                                 ae_tag = ARCHIVE_ENTRY_ACL_OTHER;
1040                         } else {
1041                                 /* Skip types that libarchive can't support. */
1042                                 continue;
1043                         }
1044
1045                         acl_get_permset(acl_entry, &acl_permset);
1046                         ae_perm = 0;
1047                         /*
1048                          * acl_get_perm() is spelled differently on different
1049                          * platforms; see bsdtar_platform.h for details.
1050                          */
1051                         if (ACL_GET_PERM(acl_permset, ACL_EXECUTE))
1052                                 ae_perm |= ARCHIVE_ENTRY_ACL_EXECUTE;
1053                         if (ACL_GET_PERM(acl_permset, ACL_READ))
1054                                 ae_perm |= ARCHIVE_ENTRY_ACL_READ;
1055                         if (ACL_GET_PERM(acl_permset, ACL_WRITE))
1056                                 ae_perm |= ARCHIVE_ENTRY_ACL_WRITE;
1057
1058                         archive_entry_acl_add_entry(entry,
1059                             archive_entry_acl_type, ae_perm, ae_tag,
1060                             ae_id, ae_name);
1061
1062                         s = acl_get_entry(acl, ACL_NEXT_ENTRY, &acl_entry);
1063                 }
1064                 acl_free(acl);
1065         }
1066 }
1067 #else
1068 void
1069 setup_acls(struct bsdtar *bsdtar, struct archive_entry *entry,
1070     const char *accpath)
1071 {
1072         (void)bsdtar;
1073         (void)entry;
1074         (void)accpath;
1075 }
1076 #endif
1077
1078 static void
1079 free_cache(struct name_cache *cache)
1080 {
1081         size_t i;
1082
1083         if (cache != NULL) {
1084                 for(i = 0; i < cache->size; i++) {
1085                         if (cache->cache[i].name != NULL &&
1086                             cache->cache[i].name != NO_NAME)
1087                                 free((void *)(uintptr_t)cache->cache[i].name);
1088                 }
1089                 free(cache);
1090         }
1091 }
1092
1093 /*
1094  * Lookup uid/gid from uname/gname, return NULL if no match.
1095  */
1096 static const char *
1097 lookup_name(struct bsdtar *bsdtar, struct name_cache **name_cache_variable,
1098     int (*lookup_fn)(struct bsdtar *, const char **, id_t), id_t id)
1099 {
1100         struct name_cache       *cache;
1101         const char *name;
1102         int slot;
1103
1104
1105         if (*name_cache_variable == NULL) {
1106                 *name_cache_variable = malloc(sizeof(struct name_cache));
1107                 if (*name_cache_variable == NULL)
1108                         bsdtar_errc(bsdtar, 1, ENOMEM, "No more memory");
1109                 memset(*name_cache_variable, 0, sizeof(struct name_cache));
1110                 (*name_cache_variable)->size = name_cache_size;
1111         }
1112
1113         cache = *name_cache_variable;
1114         cache->probes++;
1115
1116         slot = id % cache->size;
1117         if (cache->cache[slot].name != NULL) {
1118                 if (cache->cache[slot].id == id) {
1119                         cache->hits++;
1120                         if (cache->cache[slot].name == NO_NAME)
1121                                 return (NULL);
1122                         return (cache->cache[slot].name);
1123                 }
1124                 if (cache->cache[slot].name != NO_NAME)
1125                         free((void *)(uintptr_t)cache->cache[slot].name);
1126                 cache->cache[slot].name = NULL;
1127         }
1128
1129         if (lookup_fn(bsdtar, &name, id) == 0) {
1130                 if (name == NULL || name[0] == '\0') {
1131                         /* Cache the negative response. */
1132                         cache->cache[slot].name = NO_NAME;
1133                         cache->cache[slot].id = id;
1134                 } else {
1135                         cache->cache[slot].name = strdup(name);
1136                         if (cache->cache[slot].name != NULL) {
1137                                 cache->cache[slot].id = id;
1138                                 return (cache->cache[slot].name);
1139                         }
1140                         /*
1141                          * Conveniently, NULL marks an empty slot, so
1142                          * if the strdup() fails, we've just failed to
1143                          * cache it.  No recovery necessary.
1144                          */
1145                 }
1146         }
1147         return (NULL);
1148 }
1149
1150 static const char *
1151 lookup_uname(struct bsdtar *bsdtar, uid_t uid)
1152 {
1153         return (lookup_name(bsdtar, &bsdtar->uname_cache,
1154                     &lookup_uname_helper, (id_t)uid));
1155 }
1156
1157 static int
1158 lookup_uname_helper(struct bsdtar *bsdtar, const char **name, id_t id)
1159 {
1160         struct passwd   *pwent;
1161
1162         (void)bsdtar; /* UNUSED */
1163
1164         errno = 0;
1165         pwent = getpwuid((uid_t)id);
1166         if (pwent == NULL) {
1167                 *name = NULL;
1168                 if (errno != 0)
1169                         bsdtar_warnc(bsdtar, errno, "getpwuid(%d) failed", id);
1170                 return (errno);
1171         }
1172
1173         *name = pwent->pw_name;
1174         return (0);
1175 }
1176
1177 static const char *
1178 lookup_gname(struct bsdtar *bsdtar, gid_t gid)
1179 {
1180         return (lookup_name(bsdtar, &bsdtar->gname_cache,
1181                     &lookup_gname_helper, (id_t)gid));
1182 }
1183
1184 static int
1185 lookup_gname_helper(struct bsdtar *bsdtar, const char **name, id_t id)
1186 {
1187         struct group    *grent;
1188
1189         (void)bsdtar; /* UNUSED */
1190
1191         errno = 0;
1192         grent = getgrgid((gid_t)id);
1193         if (grent == NULL) {
1194                 *name = NULL;
1195                 if (errno != 0)
1196                         bsdtar_warnc(bsdtar, errno, "getgrgid(%d) failed", id);
1197                 return (errno);
1198         }
1199
1200         *name = grent->gr_name;
1201         return (0);
1202 }
1203
1204 /*
1205  * Test if the specified file is new enough to include in the archive.
1206  */
1207 int
1208 new_enough(struct bsdtar *bsdtar, const char *path, const struct stat *st)
1209 {
1210         struct archive_dir_entry *p;
1211
1212         /*
1213          * If this file/dir is excluded by a time comparison, skip it.
1214          */
1215         if (bsdtar->newer_ctime_sec > 0) {
1216                 if (st->st_ctime < bsdtar->newer_ctime_sec)
1217                         return (0); /* Too old, skip it. */
1218                 if (st->st_ctime == bsdtar->newer_ctime_sec
1219                     && ARCHIVE_STAT_CTIME_NANOS(st)
1220                     <= bsdtar->newer_ctime_nsec)
1221                         return (0); /* Too old, skip it. */
1222         }
1223         if (bsdtar->newer_mtime_sec > 0) {
1224                 if (st->st_mtime < bsdtar->newer_mtime_sec)
1225                         return (0); /* Too old, skip it. */
1226                 if (st->st_mtime == bsdtar->newer_mtime_sec
1227                     && ARCHIVE_STAT_MTIME_NANOS(st)
1228                     <= bsdtar->newer_mtime_nsec)
1229                         return (0); /* Too old, skip it. */
1230         }
1231
1232         /*
1233          * In -u mode, we only write an entry if it's newer than
1234          * what was already in the archive.
1235          */
1236         if (bsdtar->archive_dir != NULL &&
1237             bsdtar->archive_dir->head != NULL) {
1238                 /* Ignore leading './' when comparing names. */
1239                 if (path[0] == '.' && path[1] == '/' && path[2] != '\0')
1240                         path += 2;
1241
1242                 for (p = bsdtar->archive_dir->head; p != NULL; p = p->next) {
1243                         if (strcmp(path, p->name)==0)
1244                                 return (p->mtime_sec < st->st_mtime ||
1245                                     (p->mtime_sec == st->st_mtime &&
1246                                         p->mtime_nsec
1247                                         < ARCHIVE_STAT_MTIME_NANOS(st)));
1248                 }
1249         }
1250
1251         /* If the file wasn't rejected, include it. */
1252         return (1);
1253 }
1254
1255 /*
1256  * Add an entry to the dir list for 'u' mode.
1257  *
1258  * XXX TODO: Make this fast.
1259  */
1260 static void
1261 add_dir_list(struct bsdtar *bsdtar, const char *path,
1262     time_t mtime_sec, int mtime_nsec)
1263 {
1264         struct archive_dir_entry        *p;
1265
1266         if (path[0] == '.' && path[1] == '/' && path[2] != '\0')
1267                 path += 2;
1268
1269         /*
1270          * Search entire list to see if this file has appeared before.
1271          * If it has, override the timestamp data.
1272          */
1273         p = bsdtar->archive_dir->head;
1274         while (p != NULL) {
1275                 if (strcmp(path, p->name)==0) {
1276                         p->mtime_sec = mtime_sec;
1277                         p->mtime_nsec = mtime_nsec;
1278                         return;
1279                 }
1280                 p = p->next;
1281         }
1282
1283         p = malloc(sizeof(*p));
1284         if (p == NULL)
1285                 bsdtar_errc(bsdtar, 1, ENOMEM, "Can't read archive directory");
1286
1287         p->name = strdup(path);
1288         if (p->name == NULL)
1289                 bsdtar_errc(bsdtar, 1, ENOMEM, "Can't read archive directory");
1290         p->mtime_sec = mtime_sec;
1291         p->mtime_nsec = mtime_nsec;
1292         p->next = NULL;
1293         if (bsdtar->archive_dir->tail == NULL) {
1294                 bsdtar->archive_dir->head = bsdtar->archive_dir->tail = p;
1295         } else {
1296                 bsdtar->archive_dir->tail->next = p;
1297                 bsdtar->archive_dir->tail = p;
1298         }
1299 }
1300
1301 void
1302 test_for_append(struct bsdtar *bsdtar)
1303 {
1304         struct stat s;
1305
1306         if (*bsdtar->argv == NULL)
1307                 bsdtar_errc(bsdtar, 1, 0, "no files or directories specified");
1308         if (bsdtar->filename == NULL)
1309                 bsdtar_errc(bsdtar, 1, 0, "Cannot append to stdout.");
1310
1311         if (bsdtar->create_compression != 0)
1312                 bsdtar_errc(bsdtar, 1, 0,
1313                     "Cannot append to %s with compression", bsdtar->filename);
1314
1315         if (stat(bsdtar->filename, &s) != 0)
1316                 bsdtar_errc(bsdtar, 1, errno,
1317                     "Cannot stat %s", bsdtar->filename);
1318
1319         if (!S_ISREG(s.st_mode))
1320                 bsdtar_errc(bsdtar, 1, 0,
1321                     "Cannot append to %s: not a regular file.",
1322                     bsdtar->filename);
1323 }