1 /* GNU dump extensions to tar.
3 Copyright 1988, 1992-1994, 1996-1997, 1999-2001, 2003-2009,
4 2013-2014, 2016 Free Software Foundation, Inc.
6 This file is part of GNU tar.
8 GNU tar is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 GNU tar is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 /* Incremental dump specialities. */
28 /* Which child files to save under a directory. */
36 #define DIRF_INIT 0x0001 /* directory structure is initialized
37 (procdir called at least once) */
38 #define DIRF_NFS 0x0002 /* directory is mounted on nfs */
39 #define DIRF_FOUND 0x0004 /* directory is found on fs */
40 #define DIRF_NEW 0x0008 /* directory is new (not found
41 in the previous dump) */
42 #define DIRF_RENAMED 0x0010 /* directory is renamed */
44 #define DIR_IS_INITED(d) ((d)->flags & DIRF_INIT)
45 #define DIR_IS_NFS(d) ((d)->flags & DIRF_NFS)
46 #define DIR_IS_FOUND(d) ((d)->flags & DIRF_FOUND)
47 /* #define DIR_IS_NEW(d) ((d)->flags & DIRF_NEW) FIXME: not used */
48 #define DIR_IS_RENAMED(d) ((d)->flags & DIRF_RENAMED)
50 #define DIR_SET_FLAG(d,f) (d)->flags |= (f)
51 #define DIR_CLEAR_FLAG(d,f) (d)->flags &= ~(f)
53 struct dumpdir /* Dump directory listing */
55 char *contents; /* Actual contents */
56 size_t total; /* Total number of elements */
57 size_t elc; /* Number of D/N/Y elements. */
58 char **elv; /* Array of D/N/Y elements */
61 /* Directory attributes. */
64 struct directory *next;
65 struct timespec mtime; /* Modification time */
66 dev_t device_number; /* device number for directory */
67 ino_t inode_number; /* inode number for directory */
68 struct dumpdir *dump; /* Directory contents */
69 struct dumpdir *idump; /* Initial contents if the directory was
71 enum children children; /* What to save under this directory */
72 unsigned flags; /* See DIRF_ macros above */
73 struct directory *orig; /* If the directory was renamed, points to
74 the original directory structure */
75 const char *tagfile; /* Tag file, if the directory falls under
76 exclusion_tag_under */
77 char *caname; /* canonical name */
78 char *name; /* file name of directory */
81 static struct dumpdir *
82 dumpdir_create0 (const char *contents, const char *cmask)
85 size_t i, total, ctsize, len;
89 for (i = 0, total = 0, ctsize = 1, q = contents; *q; total++, q += len)
93 if (!cmask || strchr (cmask, *q))
96 dump = xmalloc (sizeof (*dump) + ctsize);
97 dump->contents = (char*)(dump + 1);
98 memcpy (dump->contents, contents, ctsize);
101 dump->elv = xcalloc (i + 1, sizeof (dump->elv[0]));
103 for (i = 0, p = dump->contents; *p; p += strlen (p) + 1)
105 if (!cmask || strchr (cmask, *p))
106 dump->elv[i++] = p + 1;
112 static struct dumpdir *
113 dumpdir_create (const char *contents)
115 return dumpdir_create0 (contents, "YND");
119 dumpdir_free (struct dumpdir *dump)
126 compare_dirnames (const void *first, const void *second)
128 char const *const *name1 = first;
129 char const *const *name2 = second;
130 return strcmp (*name1, *name2);
133 /* Locate NAME in the dumpdir array DUMP.
134 Return pointer to the slot in DUMP->contents, or NULL if not found */
136 dumpdir_locate (struct dumpdir *dump, const char *name)
142 ptr = bsearch (&name, dump->elv, dump->elc, sizeof (dump->elv[0]),
144 return ptr ? *ptr - 1: NULL;
149 struct dumpdir *dump; /* Dumpdir being iterated */
150 int all; /* Iterate over all entries, not only D/N/Y */
151 size_t next; /* Index of the next element */
155 dumpdir_next (struct dumpdir_iter *itr)
157 size_t cur = itr->next;
162 ret = itr->dump->contents + cur;
165 itr->next += strlen (ret) + 1;
167 else if (cur < itr->dump->elc)
169 ret = itr->dump->elv[cur] - 1;
177 dumpdir_first (struct dumpdir *dump, int all, struct dumpdir_iter **pitr)
179 struct dumpdir_iter *itr = xmalloc (sizeof (*itr));
184 return dumpdir_next (itr);
187 /* Return size in bytes of the dumpdir array P */
189 dumpdir_size (const char *p)
195 size_t size = strlen (p) + 1;
203 static struct directory *dirhead, *dirtail;
204 static Hash_table *directory_table;
205 static Hash_table *directory_meta_table;
207 #if HAVE_ST_FSTYPE_STRING
208 static char const nfs_string[] = "nfs";
209 # define NFS_FILE_STAT(st) (strcmp ((st).st_fstype, nfs_string) == 0)
211 # define ST_DEV_MSB(st) (~ (dev_t) 0 << (sizeof (st).st_dev * CHAR_BIT - 1))
212 # define NFS_FILE_STAT(st) (((st).st_dev & ST_DEV_MSB (st)) != 0)
215 /* Calculate the hash of a directory. */
217 hash_directory_canonical_name (void const *entry, size_t n_buckets)
219 struct directory const *directory = entry;
220 return hash_string (directory->caname, n_buckets);
223 /* Compare two directories for equality of their names. */
225 compare_directory_canonical_names (void const *entry1, void const *entry2)
227 struct directory const *directory1 = entry1;
228 struct directory const *directory2 = entry2;
229 return strcmp (directory1->caname, directory2->caname) == 0;
233 hash_directory_meta (void const *entry, size_t n_buckets)
235 struct directory const *directory = entry;
236 /* FIXME: Work out a better algorytm */
237 return (directory->device_number + directory->inode_number) % n_buckets;
240 /* Compare two directories for equality of their device and inode numbers. */
242 compare_directory_meta (void const *entry1, void const *entry2)
244 struct directory const *directory1 = entry1;
245 struct directory const *directory2 = entry2;
246 return directory1->device_number == directory2->device_number
247 && directory1->inode_number == directory2->inode_number;
250 /* Make a directory entry for given relative NAME and canonical name CANAME.
251 The latter is "stolen", i.e. the returned directory contains pointer to
253 static struct directory *
254 make_directory (const char *name, char *caname)
256 size_t namelen = strlen (name);
257 struct directory *directory = xmalloc (sizeof (*directory));
258 directory->next = NULL;
259 directory->dump = directory->idump = NULL;
260 directory->orig = NULL;
261 directory->flags = false;
262 if (namelen > 1 && ISSLASH (name[namelen - 1]))
264 directory->name = xmalloc (namelen + 1);
265 memcpy (directory->name, name, namelen);
266 directory->name[namelen] = 0;
267 directory->caname = caname;
268 directory->tagfile = NULL;
273 free_directory (struct directory *dir)
280 static struct directory *
281 attach_directory (const char *name)
283 char *cname = normalize_filename (chdir_current, name);
284 struct directory *dir = make_directory (name, cname);
295 dirlist_replace_prefix (const char *pref, const char *repl)
297 struct directory *dp;
298 size_t pref_len = strlen (pref);
299 size_t repl_len = strlen (repl);
300 for (dp = dirhead; dp; dp = dp->next)
301 replace_prefix (&dp->name, pref, pref_len, repl, repl_len);
305 clear_directory_table (void)
307 struct directory *dp;
310 hash_clear (directory_table);
311 if (directory_meta_table)
312 hash_clear (directory_meta_table);
313 for (dp = dirhead; dp; )
315 struct directory *next = dp->next;
319 dirhead = dirtail = NULL;
322 /* Create and link a new directory entry for directory NAME, having a
323 device number DEV and an inode number INO, with NFS indicating
324 whether it is an NFS device and FOUND indicating whether we have
325 found that the directory exists. */
326 static struct directory *
327 note_directory (char const *name, struct timespec mtime,
328 dev_t dev, ino_t ino, bool nfs, bool found,
329 const char *contents)
331 struct directory *directory = attach_directory (name);
333 directory->mtime = mtime;
334 directory->device_number = dev;
335 directory->inode_number = ino;
336 directory->children = CHANGED_CHILDREN;
338 DIR_SET_FLAG (directory, DIRF_NFS);
340 DIR_SET_FLAG (directory, DIRF_FOUND);
342 directory->dump = dumpdir_create (contents);
344 directory->dump = NULL;
346 if (! ((directory_table
347 || (directory_table = hash_initialize (0, 0,
348 hash_directory_canonical_name,
349 compare_directory_canonical_names,
351 && hash_insert (directory_table, directory)))
354 if (! ((directory_meta_table
355 || (directory_meta_table = hash_initialize (0, 0,
357 compare_directory_meta,
359 && hash_insert (directory_meta_table, directory)))
365 /* Return a directory entry for a given file NAME, or zero if none found. */
366 static struct directory *
367 find_directory (const char *name)
369 if (! directory_table)
373 char *caname = normalize_filename (chdir_current, name);
374 struct directory *dir = make_directory (name, caname);
375 struct directory *ret = hash_lookup (directory_table, dir);
376 free_directory (dir);
382 /* Remove directory entry for the given CANAME */
384 remove_directory (const char *caname)
386 struct directory *dir = make_directory (caname, xstrdup (caname));
387 struct directory *ret = hash_delete (directory_table, dir);
389 free_directory (ret);
390 free_directory (dir);
394 /* If first OLD_PREFIX_LEN bytes of DIR->NAME name match OLD_PREFIX,
395 replace them with NEW_PREFIX. */
397 rebase_directory (struct directory *dir,
398 const char *old_prefix, size_t old_prefix_len,
399 const char *new_prefix, size_t new_prefix_len)
401 replace_prefix (&dir->name, old_prefix, old_prefix_len,
402 new_prefix, new_prefix_len);
405 /* Return a directory entry for a given combination of device and inode
406 numbers, or zero if none found. */
407 static struct directory *
408 find_directory_meta (dev_t dev, ino_t ino)
410 if (! directory_meta_table)
414 struct directory *dir = make_directory ("", NULL);
415 struct directory *ret;
416 dir->device_number = dev;
417 dir->inode_number = ino;
418 ret = hash_lookup (directory_meta_table, dir);
419 free_directory (dir);
425 update_parent_directory (struct tar_stat_info *parent)
427 struct directory *directory = find_directory (parent->orig_file_name);
431 if (fstat (parent->fd, &st) != 0)
432 stat_diag (directory->name);
434 directory->mtime = get_stat_mtime (&st);
438 #define PD_FORCE_CHILDREN 0x10
439 #define PD_FORCE_INIT 0x20
440 #define PD_CHILDREN(f) ((f) & 3)
442 static struct directory *
443 procdir (const char *name_buffer, struct tar_stat_info *st,
447 struct directory *directory;
448 struct stat *stat_data = &st->stat;
449 bool nfs = NFS_FILE_STAT (*stat_data);
450 bool perhaps_renamed = false;
452 if ((directory = find_directory (name_buffer)) != NULL)
454 if (DIR_IS_INITED (directory))
456 if (flag & PD_FORCE_INIT)
458 assign_string (&directory->name, name_buffer);
462 *entry = 'N'; /* Avoid duplicating this directory */
467 if (strcmp (directory->name, name_buffer))
473 /* With NFS, the same file can have two different devices
474 if an NFS directory is mounted in multiple locations,
475 which is relatively common when automounting.
476 To avoid spurious incremental redumping of
477 directories, consider all NFS devices as equal,
478 relying on the i-node to establish differences. */
480 if (! ((!check_device_option
481 || (DIR_IS_NFS (directory) && nfs)
482 || directory->device_number == stat_data->st_dev)
483 && directory->inode_number == stat_data->st_ino))
485 /* FIXME: find_directory_meta ignores nfs */
486 struct directory *d = find_directory_meta (stat_data->st_dev,
490 if (strcmp (d->name, name_buffer))
492 WARNOPT (WARN_RENAME_DIRECTORY,
494 _("%s: Directory has been renamed from %s"),
495 quotearg_colon (name_buffer),
496 quote_n (1, d->name)));
498 DIR_SET_FLAG (directory, DIRF_RENAMED);
499 dirlist_replace_prefix (d->name, name_buffer);
501 directory->children = CHANGED_CHILDREN;
505 perhaps_renamed = true;
506 directory->children = ALL_CHILDREN;
507 directory->device_number = stat_data->st_dev;
508 directory->inode_number = stat_data->st_ino;
511 DIR_SET_FLAG (directory, DIRF_NFS);
514 directory->children = CHANGED_CHILDREN;
516 DIR_SET_FLAG (directory, DIRF_FOUND);
520 struct directory *d = find_directory_meta (stat_data->st_dev,
523 directory = note_directory (name_buffer,
524 get_stat_mtime (stat_data),
533 if (strcmp (d->name, name_buffer))
535 WARNOPT (WARN_RENAME_DIRECTORY,
536 (0, 0, _("%s: Directory has been renamed from %s"),
537 quotearg_colon (name_buffer),
538 quote_n (1, d->name)));
540 DIR_SET_FLAG (directory, DIRF_RENAMED);
541 dirlist_replace_prefix (d->name, name_buffer);
543 directory->children = CHANGED_CHILDREN;
547 DIR_SET_FLAG (directory, DIRF_NEW);
548 WARNOPT (WARN_NEW_DIRECTORY,
549 (0, 0, _("%s: Directory is new"),
550 quotearg_colon (name_buffer)));
551 directory->children =
552 (listed_incremental_option
553 || (OLDER_STAT_TIME (*stat_data, m)
554 || (after_date_option
555 && OLDER_STAT_TIME (*stat_data, c))))
561 if (one_file_system_option && st->parent
562 && stat_data->st_dev != st->parent->stat.st_dev)
566 _("%s: directory is on a different filesystem; not dumped"),
567 quotearg_colon (directory->name)));
568 directory->children = NO_CHILDREN;
569 /* If there is any dumpdir info in that directory, remove it */
572 dumpdir_free (directory->dump);
573 directory->dump = NULL;
575 perhaps_renamed = false;
578 else if (flag & PD_FORCE_CHILDREN)
580 directory->children = PD_CHILDREN(flag);
581 if (directory->children == NO_CHILDREN)
586 WARNOPT (WARN_RENAME_DIRECTORY,
587 (0, 0, _("%s: Directory has been renamed"),
588 quotearg_colon (name_buffer)));
590 DIR_SET_FLAG (directory, DIRF_INIT);
592 if (directory->children != NO_CHILDREN)
594 const char *tag_file_name;
596 switch (check_exclusion_tags (st, &tag_file_name))
598 case exclusion_tag_all:
599 /* This warning can be duplicated by code in dump_file0, but only
600 in case when the topmost directory being archived contains
602 exclusion_tag_warning (name_buffer, tag_file_name,
603 _("directory not dumped"));
605 directory->children = NO_CHILDREN;
608 case exclusion_tag_contents:
609 exclusion_tag_warning (name_buffer, tag_file_name,
610 _("contents not dumped"));
611 directory->children = NO_CHILDREN;
612 directory->tagfile = tag_file_name;
615 case exclusion_tag_under:
616 exclusion_tag_warning (name_buffer, tag_file_name,
617 _("contents not dumped"));
618 directory->tagfile = tag_file_name;
621 case exclusion_tag_none:
629 /* Compare dumpdir array from DIRECTORY with directory listing DIR and
630 build a new dumpdir template.
632 DIR must be returned by a previous call to savedir().
634 File names in DIRECTORY->dump->contents must be sorted
637 DIRECTORY->dump is replaced with the created template. Each entry is
638 prefixed with ' ' if it was present in DUMP and with 'Y' otherwise. */
641 makedumpdir (struct directory *directory, const char *dir)
644 dirsize, /* Number of elements in DIR */
645 len; /* Length of DIR, including terminating nul */
648 char *new_dump, *new_dump_ptr;
649 struct dumpdir *dump;
651 if (directory->children == ALL_CHILDREN)
653 else if (DIR_IS_RENAMED (directory))
654 dump = directory->orig->idump ?
655 directory->orig->idump : directory->orig->dump;
657 dump = directory->dump;
659 /* Count the size of DIR and the number of elements it contains */
662 for (p = dir; *p; p += strlen (p) + 1, dirsize++)
663 len += strlen (p) + 2;
666 /* Create a sorted directory listing */
667 array = xcalloc (dirsize, sizeof array[0]);
668 for (i = 0, p = dir; *p; p += strlen (p) + 1, i++)
671 qsort (array, dirsize, sizeof (array[0]), compare_dirnames);
673 /* Prepare space for new dumpdir */
674 new_dump = xmalloc (len);
675 new_dump_ptr = new_dump;
677 /* Fill in the dumpdir template */
678 for (i = 0; i < dirsize; i++)
680 const char *loc = dumpdir_locate (dump, array[i]);
683 if (directory->tagfile)
689 else if (directory->tagfile)
690 *new_dump_ptr++ = 'I';
692 *new_dump_ptr++ = 'Y'; /* New entry */
694 /* Copy the file name */
695 for (p = array[i]; (*new_dump_ptr++ = *p++); )
699 directory->idump = directory->dump;
700 directory->dump = dumpdir_create0 (new_dump, NULL);
705 /* Create a dumpdir containing only one entry: that for the
708 maketagdumpdir (struct directory *directory)
710 size_t len = strlen (directory->tagfile) + 1;
711 char *new_dump = xmalloc (len + 2);
713 memcpy (new_dump + 1, directory->tagfile, len);
714 new_dump[len + 1] = 0;
716 directory->idump = directory->dump;
717 directory->dump = dumpdir_create0 (new_dump, NULL);
721 /* Recursively scan the directory identified by ST. */
723 scan_directory (struct tar_stat_info *st)
725 char const *dir = st->orig_file_name;
726 char *dirp = get_directory_entries (st);
727 dev_t device = st->stat.st_dev;
728 bool cmdline = ! st->parent;
731 struct directory *directory;
737 info_attach_exclist (st);
742 directory = procdir (tmp, st,
743 (cmdline ? PD_FORCE_INIT : 0),
748 nbuf = namebuf_create (dir);
752 if (directory->children != NO_CHILDREN)
754 char *entry; /* directory entry being scanned */
755 struct dumpdir_iter *itr;
757 makedumpdir (directory, dirp);
759 for (entry = dumpdir_first (directory->dump, 1, &itr);
761 entry = dumpdir_next (itr))
763 char *full_name = namebuf_name (nbuf, entry + 1);
765 if (*entry == 'I') /* Ignored entry */
767 else if (excluded_name (full_name, st))
772 void (*diag) (char const *) = 0;
773 struct tar_stat_info stsub;
774 tar_stat_init (&stsub);
781 else if (fstatat (fd, entry + 1, &stsub.stat,
784 else if (S_ISDIR (stsub.stat.st_mode))
786 int subfd = subfile_open (st, entry + 1,
793 if (fstat (subfd, &stsub.stat) != 0)
800 file_removed_diag (full_name, false, diag);
803 else if (S_ISDIR (stsub.stat.st_mode))
806 if (!recursion_option)
807 pd_flag |= PD_FORCE_CHILDREN | NO_CHILDREN;
808 else if (directory->children == ALL_CHILDREN)
809 pd_flag |= PD_FORCE_CHILDREN | ALL_CHILDREN;
813 procdir (full_name, &stsub, pd_flag, entry);
814 restore_parent_fd (&stsub);
816 else if (one_file_system_option &&
817 device != stsub.stat.st_dev)
819 else if (*entry == 'Y')
820 /* New entry, skip further checks */;
821 /* FIXME: if (S_ISHIDDEN (stat_data.st_mode))?? */
822 else if (OLDER_STAT_TIME (stsub.stat, m)
823 && (!after_date_option
824 || OLDER_STAT_TIME (stsub.stat, c)))
829 tar_stat_destroy (&stsub);
834 else if (directory->tagfile)
835 maketagdumpdir (directory);
845 /* Return pointer to the contents of the directory DIR */
847 directory_contents (struct directory *dir)
851 return dir->dump ? dir->dump->contents : NULL;
854 /* A "safe" version of directory_contents, which never returns NULL. */
856 safe_directory_contents (struct directory *dir)
858 const char *ret = directory_contents (dir);
859 return ret ? ret : "\0\0\0\0";
864 obstack_code_rename (struct obstack *stk, char const *from, char const *to)
868 s = from[0] == 0 ? from :
869 safer_name_suffix (from, false, absolute_names_option);
870 obstack_1grow (stk, 'R');
871 obstack_grow (stk, s, strlen (s) + 1);
874 safer_name_suffix (to, false, absolute_names_option);
875 obstack_1grow (stk, 'T');
876 obstack_grow (stk, s, strlen (s) + 1);
880 store_rename (struct directory *dir, struct obstack *stk)
882 if (DIR_IS_RENAMED (dir))
884 struct directory *prev, *p;
886 /* Detect eventual cycles and clear DIRF_RENAMED flag, so these entries
887 are ignored when hit by this function next time.
888 If the chain forms a cycle, prev points to the entry DIR is renamed
889 from. In this case it still retains DIRF_RENAMED flag, which will be
890 cleared in the 'else' branch below */
891 for (prev = dir; prev && prev->orig != dir; prev = prev->orig)
892 DIR_CLEAR_FLAG (prev, DIRF_RENAMED);
896 for (p = dir; p && p->orig; p = p->orig)
897 obstack_code_rename (stk, p->orig->name, p->name);
903 DIR_CLEAR_FLAG (prev, DIRF_RENAMED);
905 /* Break the cycle by using a temporary name for one of its
907 First, create a temp name stub entry. */
908 temp_name = dir_name (dir->name);
909 obstack_1grow (stk, 'X');
910 obstack_grow (stk, temp_name, strlen (temp_name) + 1);
912 obstack_code_rename (stk, dir->name, "");
914 for (p = dir; p != prev; p = p->orig)
915 obstack_code_rename (stk, p->orig->name, p->name);
917 obstack_code_rename (stk, "", prev->name);
923 append_incremental_renames (struct directory *dir)
927 struct directory *dp;
934 dump = directory_contents (dir);
937 size = dumpdir_size (dump) - 1;
938 obstack_grow (&stk, dump, size);
943 for (dp = dirhead; dp; dp = dp->next)
944 store_rename (dp, &stk);
946 /* FIXME: Is this the right thing to do when DIR is null? */
947 if (dir && obstack_object_size (&stk) != size)
949 obstack_1grow (&stk, 0);
950 dumpdir_free (dir->dump);
951 dir->dump = dumpdir_create (obstack_finish (&stk));
953 obstack_free (&stk, NULL);
958 static FILE *listed_incremental_stream;
960 /* Version of incremental format snapshots (directory files) used by this
961 tar. Currently it is supposed to be a single decimal number. 0 means
962 incremental snapshots as per tar version before 1.15.2.
964 The current tar version supports incremental versions from
965 0 up to TAR_INCREMENTAL_VERSION, inclusive.
966 It is able to create only snapshots of TAR_INCREMENTAL_VERSION */
968 #define TAR_INCREMENTAL_VERSION 2
970 /* Read incremental snapshot formats 0 and 1 */
972 read_incr_db_01 (int version, const char *initbuf)
983 if (getline (&buf, &bufsize, listed_incremental_stream) <= 0)
985 read_error (listed_incremental_option);
993 buf = strdup (initbuf);
994 bufsize = strlen (buf) + 1;
997 newer_mtime_option = decode_timespec (buf, &ebuf, false);
999 if (! valid_timespec (newer_mtime_option))
1000 ERROR ((0, errno, "%s:%ld: %s",
1001 quotearg_colon (listed_incremental_option),
1003 _("Invalid time stamp")));
1006 if (version == 1 && *ebuf)
1008 char const *buf_ns = ebuf + 1;
1010 u = strtoumax (buf_ns, &ebuf, 10);
1011 if (!errno && BILLION <= u)
1013 if (errno || buf_ns == ebuf)
1015 ERROR ((0, errno, "%s:%ld: %s",
1016 quotearg_colon (listed_incremental_option),
1018 _("Invalid time stamp")));
1019 newer_mtime_option.tv_sec = TYPE_MINIMUM (time_t);
1020 newer_mtime_option.tv_nsec = -1;
1023 newer_mtime_option.tv_nsec = u;
1027 while (0 < (n = getline (&buf, &bufsize, listed_incremental_stream)))
1031 bool nfs = buf[0] == '+';
1032 char *strp = buf + nfs;
1033 struct timespec mtime;
1037 if (buf[n - 1] == '\n')
1042 mtime = decode_timespec (strp, &ebuf, false);
1044 if (!valid_timespec (mtime) || *strp != ' ')
1045 ERROR ((0, errno, "%s:%ld: %s",
1046 quotearg_colon (listed_incremental_option), lineno,
1047 _("Invalid modification time")));
1050 u = strtoumax (strp, &ebuf, 10);
1051 if (!errno && BILLION <= u)
1053 if (errno || strp == ebuf || *ebuf != ' ')
1055 ERROR ((0, errno, "%s:%ld: %s",
1056 quotearg_colon (listed_incremental_option), lineno,
1057 _("Invalid modification time (nanoseconds)")));
1065 mtime.tv_sec = mtime.tv_nsec = 0;
1067 dev = strtosysint (strp, &ebuf,
1068 TYPE_MINIMUM (dev_t), TYPE_MAXIMUM (dev_t));
1070 if (errno || *strp != ' ')
1071 ERROR ((0, errno, "%s:%ld: %s",
1072 quotearg_colon (listed_incremental_option), lineno,
1073 _("Invalid device number")));
1075 ino = strtosysint (strp, &ebuf,
1076 TYPE_MINIMUM (ino_t), TYPE_MAXIMUM (ino_t));
1078 if (errno || *strp != ' ')
1079 ERROR ((0, errno, "%s:%ld: %s",
1080 quotearg_colon (listed_incremental_option), lineno,
1081 _("Invalid inode number")));
1084 unquote_string (strp);
1085 note_directory (strp, mtime, dev, ino, nfs, false, NULL);
1090 /* Read a nul-terminated string from FP and store it in STK.
1091 Store the number of bytes read (including nul terminator) in PCOUNT.
1093 Return the last character read or EOF on end of file. */
1095 read_obstack (FILE *fp, struct obstack *stk, size_t *pcount)
1100 for (i = 0, c = getc (fp); c != EOF && c != 0; c = getc (fp), i++)
1101 obstack_1grow (stk, c);
1102 obstack_1grow (stk, 0);
1108 /* Read from file FP a null-terminated string and convert it to an
1109 integer. FIELDNAME is the intended use of the integer, useful for
1110 diagnostics. MIN_VAL and MAX_VAL are its minimum and maximum
1111 permissible values; MIN_VAL must be nonpositive and MAX_VAL positive.
1112 Store into *PVAL the resulting value, converted to intmax_t.
1114 Throw a fatal error if the string cannot be converted or if the
1115 converted value is out of range.
1117 Return true if successful, false if end of file. */
1120 read_num (FILE *fp, char const *fieldname,
1121 intmax_t min_val, uintmax_t max_val, intmax_t *pval)
1124 char buf[INT_BUFSIZE_BOUND (intmax_t)];
1125 char offbuf[INT_BUFSIZE_BOUND (off_t)];
1126 char minbuf[INT_BUFSIZE_BOUND (intmax_t)];
1127 char maxbuf[INT_BUFSIZE_BOUND (intmax_t)];
1128 int conversion_errno;
1130 bool negative = c == '-';
1132 for (i = 0; (i == 0 && negative) || ISDIGIT (c); i++)
1135 if (i == sizeof buf - 1)
1137 _("%s: byte %s: %s %.*s... too long"),
1138 quotearg_colon (listed_incremental_option),
1139 offtostr (ftello (fp), offbuf),
1140 fieldname, i + 1, buf));
1149 read_fatal (listed_incremental_option);
1151 FATAL_ERROR ((0, 0, "%s: %s",
1152 quotearg_colon (listed_incremental_option),
1153 _("Unexpected EOF in snapshot file")));
1161 _("%s: byte %s: %s %s followed by invalid byte 0x%02x"),
1162 quotearg_colon (listed_incremental_option),
1163 offtostr (ftello (fp), offbuf),
1164 fieldname, buf, uc));
1167 *pval = strtosysint (buf, NULL, min_val, max_val);
1168 conversion_errno = errno;
1170 switch (conversion_errno)
1173 FATAL_ERROR ((0, conversion_errno,
1174 _("%s: byte %s: (valid range %s..%s)\n\t%s %s"),
1175 quotearg_colon (listed_incremental_option),
1176 offtostr (ftello (fp), offbuf),
1177 imaxtostr (min_val, minbuf),
1178 umaxtostr (max_val, maxbuf), fieldname, buf));
1180 FATAL_ERROR ((0, conversion_errno,
1181 _("%s: byte %s: %s %s"),
1182 quotearg_colon (listed_incremental_option),
1183 offtostr (ftello (fp), offbuf), fieldname, buf));
1191 /* Read from FP two NUL-terminated strings representing a struct
1192 timespec. Return the resulting value in PVAL.
1194 Throw a fatal error if the string cannot be converted. */
1197 read_timespec (FILE *fp, struct timespec *pval)
1201 if (read_num (fp, "sec", TYPE_MINIMUM (time_t), TYPE_MAXIMUM (time_t), &s)
1202 && read_num (fp, "nsec", 0, BILLION - 1, &ns))
1209 FATAL_ERROR ((0, 0, "%s: %s",
1210 quotearg_colon (listed_incremental_option),
1211 _("Unexpected EOF in snapshot file")));
1215 /* Read incremental snapshot format 2 */
1217 read_incr_db_2 (void)
1220 char offbuf[INT_BUFSIZE_BOUND (off_t)];
1222 obstack_init (&stk);
1224 read_timespec (listed_incremental_stream, &newer_mtime_option);
1229 struct timespec mtime;
1237 if (! read_num (listed_incremental_stream, "nfs", 0, 1, &i))
1238 return; /* Normal return */
1242 read_timespec (listed_incremental_stream, &mtime);
1244 if (! read_num (listed_incremental_stream, "dev",
1245 TYPE_MINIMUM (dev_t), TYPE_MAXIMUM (dev_t), &i))
1249 if (! read_num (listed_incremental_stream, "ino",
1250 TYPE_MINIMUM (ino_t), TYPE_MAXIMUM (ino_t), &i))
1254 if (read_obstack (listed_incremental_stream, &stk, &s))
1257 name = obstack_finish (&stk);
1259 while (read_obstack (listed_incremental_stream, &stk, &s) == 0 && s > 1)
1261 if (getc (listed_incremental_stream) != 0)
1262 FATAL_ERROR ((0, 0, _("%s: byte %s: %s"),
1263 quotearg_colon (listed_incremental_option),
1264 offtostr (ftello (listed_incremental_stream), offbuf),
1265 _("Missing record terminator")));
1267 content = obstack_finish (&stk);
1268 note_directory (name, mtime, dev, ino, nfs, false, content);
1269 obstack_free (&stk, content);
1271 FATAL_ERROR ((0, 0, "%s: %s",
1272 quotearg_colon (listed_incremental_option),
1273 _("Unexpected EOF in snapshot file")));
1276 /* Display (to stdout) the range of allowed values for each field
1277 in the snapshot file. The array below should be kept in sync
1278 with any changes made to the read_num() calls in the parsing
1279 loop inside read_incr_db_2().
1281 (This function is invoked via the --show-snapshot-field-ranges
1282 command line option.) */
1286 char const *fieldname;
1291 static struct field_range const field_ranges[] = {
1293 { "timestamp_sec", TYPE_MINIMUM (time_t), TYPE_MAXIMUM (time_t) },
1294 { "timestamp_nsec", 0, BILLION - 1 },
1295 { "dev", TYPE_MINIMUM (dev_t), TYPE_MAXIMUM (dev_t) },
1296 { "ino", TYPE_MINIMUM (ino_t), TYPE_MAXIMUM (ino_t) },
1301 show_snapshot_field_ranges (void)
1303 struct field_range const *p;
1304 char minbuf[SYSINT_BUFSIZE];
1305 char maxbuf[SYSINT_BUFSIZE];
1307 printf("This tar's snapshot file field ranges are\n");
1308 printf (" (%-15s => [ %s, %s ]):\n\n", "field name", "min", "max");
1310 for (p=field_ranges; p->fieldname != NULL; p++)
1312 printf (" %-15s => [ %s, %s ],\n", p->fieldname,
1313 sysinttostr (p->min_val, p->min_val, p->max_val, minbuf),
1314 sysinttostr (p->max_val, p->min_val, p->max_val, maxbuf));
1321 /* Read incremental snapshot file (directory file).
1322 If the file has older incremental version, make sure that it is processed
1323 correctly and that tar will use the most conservative backup method among
1324 possible alternatives (i.e. prefer ALL_CHILDREN over CHANGED_CHILDREN,
1325 etc.) This ensures that the snapshots are updated to the recent version
1326 without any loss of data. */
1328 read_directory_file (void)
1333 int flags = O_RDWR | O_CREAT;
1335 if (incremental_level == 0)
1337 /* Open the file for both read and write. That way, we can write
1338 it later without having to reopen it, and don't have to worry if
1339 we chdir in the meantime. */
1340 fd = open (listed_incremental_option, flags, MODE_RW);
1343 open_error (listed_incremental_option);
1347 listed_incremental_stream = fdopen (fd, "r+");
1348 if (! listed_incremental_stream)
1350 open_error (listed_incremental_option);
1355 /* Consume the first name from the name list and reset the
1356 list afterwards. This is done to change to the new
1357 directory, if the first name is a chdir request (-C dir),
1358 which is necessary to recreate absolute file names. */
1362 if (0 < getline (&buf, &bufsize, listed_incremental_stream))
1365 uintmax_t incremental_version;
1367 if (strncmp (buf, PACKAGE_NAME, sizeof PACKAGE_NAME - 1) == 0)
1369 ebuf = buf + sizeof PACKAGE_NAME - 1;
1371 ERROR((1, 0, _("Bad incremental file format")));
1372 for (; *ebuf != '-'; ebuf++)
1374 ERROR((1, 0, _("Bad incremental file format")));
1376 incremental_version = strtoumax (ebuf + 1, NULL, 10);
1379 incremental_version = 0;
1381 switch (incremental_version)
1385 read_incr_db_01 (incremental_version, buf);
1388 case TAR_INCREMENTAL_VERSION:
1393 ERROR ((1, 0, _("Unsupported incremental format version: %"PRIuMAX),
1394 incremental_version));
1399 if (ferror (listed_incremental_stream))
1400 read_error (listed_incremental_option);
1404 /* Output incremental data for the directory ENTRY to the file DATA.
1405 Return nonzero if successful, preserving errno on write failure. */
1407 write_directory_file_entry (void *entry, void *data)
1409 struct directory const *directory = entry;
1412 if (DIR_IS_FOUND (directory))
1414 char buf[SYSINT_BUFSIZE];
1417 s = DIR_IS_NFS (directory) ? "1" : "0";
1418 fwrite (s, 2, 1, fp);
1419 s = sysinttostr (directory->mtime.tv_sec, TYPE_MINIMUM (time_t),
1420 TYPE_MAXIMUM (time_t), buf);
1421 fwrite (s, strlen (s) + 1, 1, fp);
1422 s = imaxtostr (directory->mtime.tv_nsec, buf);
1423 fwrite (s, strlen (s) + 1, 1, fp);
1424 s = sysinttostr (directory->device_number,
1425 TYPE_MINIMUM (dev_t), TYPE_MAXIMUM (dev_t), buf);
1426 fwrite (s, strlen (s) + 1, 1, fp);
1427 s = sysinttostr (directory->inode_number,
1428 TYPE_MINIMUM (ino_t), TYPE_MAXIMUM (ino_t), buf);
1429 fwrite (s, strlen (s) + 1, 1, fp);
1431 fwrite (directory->name, strlen (directory->name) + 1, 1, fp);
1432 if (directory->dump)
1435 struct dumpdir_iter *itr;
1437 for (p = dumpdir_first (directory->dump, 0, &itr);
1439 p = dumpdir_next (itr))
1440 fwrite (p, strlen (p) + 1, 1, fp);
1443 fwrite ("\0\0", 2, 1, fp);
1446 return ! ferror (fp);
1450 write_directory_file (void)
1452 FILE *fp = listed_incremental_stream;
1453 char buf[UINTMAX_STRSIZE_BOUND];
1459 if (fseeko (fp, 0L, SEEK_SET) != 0)
1460 seek_error (listed_incremental_option);
1461 if (sys_truncate (fileno (fp)) != 0)
1462 truncate_error (listed_incremental_option);
1464 fprintf (fp, "%s-%s-%d\n", PACKAGE_NAME, PACKAGE_VERSION,
1465 TAR_INCREMENTAL_VERSION);
1467 s = (TYPE_SIGNED (time_t)
1468 ? imaxtostr (start_time.tv_sec, buf)
1469 : umaxtostr (start_time.tv_sec, buf));
1470 fwrite (s, strlen (s) + 1, 1, fp);
1471 s = umaxtostr (start_time.tv_nsec, buf);
1472 fwrite (s, strlen (s) + 1, 1, fp);
1474 if (! ferror (fp) && directory_table)
1475 hash_do_for_each (directory_table, write_directory_file_entry, fp);
1478 write_error (listed_incremental_option);
1479 if (fclose (fp) != 0)
1480 close_error (listed_incremental_option);
1484 /* Restoration of incremental dumps. */
1487 get_gnu_dumpdir (struct tar_stat_info *stat_info)
1491 union block *data_block;
1495 size = stat_info->stat.st_size;
1497 archive_dir = xmalloc (size);
1500 set_next_block_after (current_header);
1501 mv_begin_read (stat_info);
1503 for (; size > 0; size -= copied)
1505 mv_size_left (size);
1506 data_block = find_next_block ();
1508 ERROR ((1, 0, _("Unexpected EOF in archive")));
1509 copied = available_space_after (data_block);
1512 memcpy (to, data_block->buffer, copied);
1514 set_next_block_after ((union block *)
1515 (data_block->buffer + copied - 1));
1520 stat_info->dumpdir = archive_dir;
1521 stat_info->skipped = true; /* For skip_member() and friends
1522 to work correctly */
1525 /* Return T if STAT_INFO represents a dumpdir archive member.
1526 Note: can invalidate current_header. It happens if flush_archive()
1527 gets called within get_gnu_dumpdir() */
1529 is_dumpdir (struct tar_stat_info *stat_info)
1531 if (stat_info->is_dumpdir && !stat_info->dumpdir)
1532 get_gnu_dumpdir (stat_info);
1533 return stat_info->is_dumpdir;
1537 dumpdir_ok (char *dumpdir)
1540 int has_tempdir = 0;
1543 for (p = dumpdir; *p; p += strlen (p) + 1)
1545 if (expect && *p != expect)
1547 unsigned char uc = *p;
1549 _("Malformed dumpdir: expected '%c' but found %#3o"),
1559 _("Malformed dumpdir: 'X' duplicated")));
1572 _("Malformed dumpdir: empty name in 'R'")));
1585 _("Malformed dumpdir: 'T' not preceded by 'R'")));
1588 if (p[1] == 0 && !has_tempdir)
1591 _("Malformed dumpdir: empty name in 'T'")));
1603 /* FIXME: bail out? */
1611 _("Malformed dumpdir: expected '%c' but found end of data"),
1617 WARNOPT (WARN_BAD_DUMPDIR,
1618 (0, 0, _("Malformed dumpdir: 'X' never used")));
1623 /* Examine the directories under directory_name and delete any
1624 files that were not there at the time of the back-up. */
1626 try_purge_directory (char const *directory_name)
1629 char *cur, *arc, *p;
1630 char *temp_stub = NULL;
1631 struct dumpdir *dump;
1633 if (!is_dumpdir (¤t_stat_info))
1636 current_dir = tar_savedir (directory_name, 0);
1639 /* The directory doesn't exist now. It'll be created. In any
1640 case, we don't have to delete any files out of it. */
1643 /* Verify if dump directory is sane */
1644 if (!dumpdir_ok (current_stat_info.dumpdir))
1647 /* Process renames */
1648 for (arc = current_stat_info.dumpdir; *arc; arc += strlen (arc) + 1)
1652 #define TEMP_DIR_TEMPLATE "tar.XXXXXX"
1653 size_t len = strlen (arc + 1);
1654 temp_stub = xrealloc (temp_stub, len + 1 + sizeof TEMP_DIR_TEMPLATE);
1655 memcpy (temp_stub, arc + 1, len);
1656 temp_stub[len] = '/';
1657 memcpy (temp_stub + len + 1, TEMP_DIR_TEMPLATE,
1658 sizeof TEMP_DIR_TEMPLATE);
1659 if (!mkdtemp (temp_stub))
1662 _("Cannot create temporary directory using template %s"),
1663 quote (temp_stub)));
1669 else if (*arc == 'R')
1673 arc += strlen (arc) + 1;
1676 /* Ensure that neither source nor destination are absolute file
1677 names (unless permitted by -P option), and that they do not
1678 contain dubious parts (e.g. ../).
1680 This is an extra safety precaution. Besides, it might be
1681 necessary to extract from archives created with tar versions
1685 src = safer_name_suffix (src, false, absolute_names_option);
1687 dst = safer_name_suffix (dst, false, absolute_names_option);
1694 if (!rename_directory (src, dst))
1698 /* FIXME: Make sure purge_directory(dst) will return
1707 /* Process deletes */
1708 dump = dumpdir_create (current_stat_info.dumpdir);
1710 for (cur = current_dir; *cur; cur += strlen (cur) + 1)
1715 p = make_file_name (directory_name, cur);
1717 if (deref_stat (p, &st) != 0)
1719 if (errno != ENOENT) /* FIXME: Maybe keep a list of renamed
1720 dirs and check it here? */
1723 WARN ((0, 0, _("%s: Not purging directory: unable to stat"),
1724 quotearg_colon (p)));
1729 if (!(entry = dumpdir_locate (dump, cur))
1730 || (*entry == 'D' && !S_ISDIR (st.st_mode))
1731 || (*entry == 'Y' && S_ISDIR (st.st_mode)))
1733 if (one_file_system_option && st.st_dev != root_device)
1736 _("%s: directory is on a different device: not purging"),
1737 quotearg_colon (p)));
1741 if (! interactive_option || confirm ("delete", p))
1744 fprintf (stdlis, _("%s: Deleting %s\n"),
1745 program_name, quote (p));
1746 if (! remove_any_file (p, RECURSIVE_REMOVE_OPTION))
1749 ERROR ((0, e, _("%s: Cannot remove"), quotearg_colon (p)));
1755 dumpdir_free (dump);
1762 purge_directory (char const *directory_name)
1764 if (!try_purge_directory (directory_name))
1769 list_dumpdir (char *buffer, size_t size)
1782 fprintf (stdlis, "%c", *buffer);
1785 fprintf (stdlis, " ");
1793 fputc ('\n', stdlis);
1800 fputc (*buffer, stdlis);