716 lines
18 KiB
C
716 lines
18 KiB
C
/* GNU dump extensions to tar.
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Copyright (C) 1988, 92, 93, 94, 96, 97 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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59 Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "system.h"
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#include <time.h>
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time_t time ();
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#define ISDIGIT(Char) (ISASCII (Char) && isdigit (Char))
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#define ISSPACE(Char) (ISASCII (Char) && isspace (Char))
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#include "common.h"
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/* Variable sized generic character buffers. */
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struct accumulator
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{
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int allocated;
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int length;
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char *pointer;
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};
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/* Amount of space guaranteed just after a reallocation. */
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#define ACCUMULATOR_SLACK 50
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/*---------------------------------------------------------.
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| Return the accumulated data from an ACCUMULATOR buffer. |
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`---------------------------------------------------------*/
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static char *
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get_accumulator (struct accumulator *accumulator)
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{
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return accumulator->pointer;
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}
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/*-----------------------------------------------.
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| Allocate and return a new accumulator buffer. |
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`-----------------------------------------------*/
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static struct accumulator *
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new_accumulator (void)
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{
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struct accumulator *accumulator
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= (struct accumulator *) xmalloc (sizeof (struct accumulator));
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accumulator->allocated = ACCUMULATOR_SLACK;
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accumulator->pointer = (char *) xmalloc (ACCUMULATOR_SLACK);
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accumulator->length = 0;
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return accumulator;
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}
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/*-----------------------------------.
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| Deallocate an ACCUMULATOR buffer. |
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`-----------------------------------*/
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static void
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delete_accumulator (struct accumulator *accumulator)
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{
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free (accumulator->pointer);
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free (accumulator);
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}
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/*----------------------------------------------------------------------.
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| At the end of an ACCUMULATOR buffer, add a DATA block of SIZE bytes. |
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`----------------------------------------------------------------------*/
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static void
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add_to_accumulator (struct accumulator *accumulator,
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const char *data, int size)
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{
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if (accumulator->length + size > accumulator->allocated)
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{
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accumulator->allocated = accumulator->length + size + ACCUMULATOR_SLACK;
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accumulator->pointer = (char *)
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xrealloc (accumulator->pointer, (size_t) accumulator->allocated);
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}
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memcpy (accumulator->pointer + accumulator->length, data, (size_t) size);
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accumulator->length += size;
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}
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/* Incremental dump specialities. */
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/* Current time. */
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static time_t time_now;
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/* List of directory names. */
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struct directory
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{
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struct directory *next; /* next entry in list */
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const char *name; /* path name of directory */
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int device_number; /* device number for directory */
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int inode_number; /* inode number for directory */
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int allnew;
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const char *dir_text;
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};
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static struct directory *directory_list = NULL;
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/*-------------------------------------------------------------------.
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| Create and link a new directory entry for directory NAME, having a |
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| DEVICE_NUMBER and a INODE_NUMBER, with some TEXT. |
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`-------------------------------------------------------------------*/
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static void
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note_directory (char *name, dev_t device_number, ino_t inode_number,
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const char *text)
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{
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struct directory *directory
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= (struct directory *) xmalloc (sizeof (struct directory));
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directory->next = directory_list;
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directory_list = directory;
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directory->device_number = device_number;
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directory->inode_number = inode_number;
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directory->name = xstrdup (name);
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directory->dir_text = text;
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directory->allnew = 0;
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}
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/*------------------------------------------------------------------------.
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| Return a directory entry for a given path NAME, or NULL if none found. |
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`------------------------------------------------------------------------*/
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static struct directory *
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find_directory (char *name)
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{
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struct directory *directory;
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for (directory = directory_list;
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directory;
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directory = directory->next)
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{
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if (!strcmp (directory->name, name))
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return directory;
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}
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return NULL;
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}
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/*---.
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| ? |
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`---*/
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static int
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compare_dirents (const voidstar first, const voidstar second)
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{
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return strcmp ((*(char *const *) first) + 1,
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(*(char *const *) second) + 1);
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}
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/*---.
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| ? |
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`---*/
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char *
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get_directory_contents (char *path, int device)
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{
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struct accumulator *accumulator;
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/* Recursively scan the given PATH. */
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{
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DIR *dirp = opendir (path); /* for scanning directory */
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struct dirent *entry; /* directory entry being scanned */
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char *name_buffer; /* directory, `/', and directory member */
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int name_buffer_size; /* allocated size of name_buffer, minus 2 */
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int name_length; /* used length in name_buffer */
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struct directory *directory; /* for checking if already already seen */
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int all_children;
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if (dirp == NULL)
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{
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ERROR ((0, errno, _("Cannot open directory %s"), path));
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return NULL;
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}
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errno = 0; /* FIXME: errno should be read-only */
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name_buffer_size = strlen (path) + NAME_FIELD_SIZE;
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name_buffer = xmalloc ((size_t) (name_buffer_size + 2));
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strcpy (name_buffer, path);
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if (path[strlen (path) - 1] != '/')
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strcat (name_buffer, "/");
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name_length = strlen (name_buffer);
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directory = find_directory (path);
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all_children = directory ? directory->allnew : 0;
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accumulator = new_accumulator ();
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while (entry = readdir (dirp), entry)
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{
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struct stat stat_data;
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/* Skip `.' and `..'. */
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if (is_dot_or_dotdot (entry->d_name))
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continue;
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if ((int) NAMLEN (entry) + name_length >= name_buffer_size)
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{
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while ((int) NAMLEN (entry) + name_length >= name_buffer_size)
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name_buffer_size += NAME_FIELD_SIZE;
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name_buffer = (char *)
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xrealloc (name_buffer, (size_t) (name_buffer_size + 2));
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}
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strcpy (name_buffer + name_length, entry->d_name);
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if (dereference_option
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#ifdef AIX
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? statx (name_buffer, &stat_data, STATSIZE, STX_HIDDEN)
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: statx (name_buffer, &stat_data, STATSIZE, STX_HIDDEN | STX_LINK)
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#else
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? stat (name_buffer, &stat_data)
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: lstat (name_buffer, &stat_data)
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#endif
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)
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{
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ERROR ((0, errno, _("Cannot stat %s"), name_buffer));
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continue;
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}
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if ((one_file_system_option && device != stat_data.st_dev)
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|| (exclude_option && check_exclude (name_buffer)))
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add_to_accumulator (accumulator, "N", 1);
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#ifdef AIX
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else if (S_ISHIDDEN (stat_data.st_mode))
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{
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add_to_accumulator (accumulator, "D", 1);
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strcat (entry->d_name, "A");
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entry->d_namlen++;
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}
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#endif
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else if (S_ISDIR (stat_data.st_mode))
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{
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if (directory = find_directory (name_buffer), directory)
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{
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/* Devices having the high bit set are NFS devices, which are
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attributed somewhat randomly in automounting situations.
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For avoiding spurious incremental redumping of directories,
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we have to plainly consider all NFS devices as equal,
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relying on the i-node only to establish differences. */
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/* FIXME: G<>ran Uddeborg <goeran@uddeborg.pp.se> says, on
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1996-09-20, that SunOS 5/Solaris 2 uses unsigned long for
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the device number type. */
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if ((((short) directory->device_number >= 0
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|| (short) stat_data.st_dev >= 0)
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&& directory->device_number != stat_data.st_dev)
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|| directory->inode_number != stat_data.st_ino)
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{
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if (verbose_option)
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WARN ((0, 0, _("Directory %s has been renamed"),
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name_buffer));
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directory->allnew = 1;
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directory->device_number = stat_data.st_dev;
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directory->inode_number = stat_data.st_ino;
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}
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directory->dir_text = "";
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}
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else
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{
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if (verbose_option)
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WARN ((0, 0, _("Directory %s is new"), name_buffer));
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note_directory (name_buffer, stat_data.st_dev, stat_data.st_ino,
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"");
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directory = find_directory (name_buffer);
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directory->allnew = 1;
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}
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if (all_children && directory)
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directory->allnew = 1;
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add_to_accumulator (accumulator, "D", 1);
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}
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else
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if (!all_children
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&& stat_data.st_mtime < newer_mtime_option
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&& (!after_date_option
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|| stat_data.st_ctime < newer_ctime_option))
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add_to_accumulator (accumulator, "N", 1);
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else
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add_to_accumulator (accumulator, "Y", 1);
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add_to_accumulator (accumulator,
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entry->d_name, (int) (NAMLEN (entry) + 1));
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}
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add_to_accumulator (accumulator, "\000\000", 2);
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free (name_buffer);
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closedir (dirp);
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}
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/* Sort the contents of the directory, now that we have it all. */
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{
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char *pointer = get_accumulator (accumulator);
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size_t counter;
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char *cursor;
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char *buffer;
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char **array;
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char **array_cursor;
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counter = 0;
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for (cursor = pointer; *cursor; cursor += strlen (cursor) + 1)
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counter++;
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if (counter == 0)
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{
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delete_accumulator (accumulator);
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return NULL;
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}
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array = (char **) xmalloc (sizeof (char *) * (counter + 1));
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array_cursor = array;
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for (cursor = pointer; *cursor; cursor += strlen (cursor) + 1)
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*array_cursor++ = cursor;
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*array_cursor = NULL;
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qsort ((voidstar) array, counter, sizeof (char *), compare_dirents);
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buffer = (char *) xmalloc ((size_t) (cursor - pointer + 2));
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cursor = buffer;
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for (array_cursor = array; *array_cursor; array_cursor++)
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{
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char *string = *array_cursor;
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while ((*cursor++ = *string++))
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continue;
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}
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*cursor = '\0';
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delete_accumulator (accumulator);
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free (array);
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return buffer;
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}
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}
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/*----------------------------------------------------------------------.
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| Add all the files in PATH, which is a directory, to the namelist. If |
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| any of the files is a directory, recurse on the subdirectory. |
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`----------------------------------------------------------------------*/
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static void
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add_hierarchy_to_namelist (char *path, int device)
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{
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char *buffer = get_directory_contents (path, device);
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{
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struct name *name;
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for (name = namelist; name; name = name->next)
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if (strcmp (name->name, path) == 0)
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break;
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if (name)
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name->dir_contents = buffer ? buffer : "\0\0\0\0";
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}
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if (buffer)
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{
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int name_length = strlen (path);
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int allocated_length = (name_length >= NAME_FIELD_SIZE
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? name_length + NAME_FIELD_SIZE
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: NAME_FIELD_SIZE);
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char *name_buffer = xmalloc ((size_t) (allocated_length + 1));
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/* FIXME: + 2 above? */
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char *string;
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int string_length;
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strcpy (name_buffer, path);
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if (name_buffer[name_length - 1] != '/')
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{
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name_buffer[name_length++] = '/';
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name_buffer[name_length] = '\0';
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}
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for (string = buffer; *string; string += string_length + 1)
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{
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string_length = strlen (string);
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if (*string == 'D')
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{
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if (name_length + string_length >= allocated_length)
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{
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while (name_length + string_length >= allocated_length)
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allocated_length += NAME_FIELD_SIZE;
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name_buffer = (char *)
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xrealloc (name_buffer, (size_t) (allocated_length + 1));
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}
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strcpy (name_buffer + name_length, string + 1);
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addname (name_buffer);
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add_hierarchy_to_namelist (name_buffer, device);
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}
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}
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free (name_buffer);
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}
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}
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/*---.
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| ? |
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`---*/
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static void
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read_directory_file (void)
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{
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dev_t device_number;
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ino_t inode_number;
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char *strp;
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FILE *fp;
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char buf[512];
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static char *path = NULL;
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if (path == NULL)
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path = xmalloc (PATH_MAX);
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time (&time_now);
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if (listed_incremental_option[0] != '/')
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{
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#if HAVE_GETCWD
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if (!getcwd (path, PATH_MAX))
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FATAL_ERROR ((0, 0, _("Could not get current directory")));
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#else
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char *getwd ();
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if (!getwd (path))
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FATAL_ERROR ((0, 0, _("Could not get current directory: %s"), path));
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#endif
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if (strlen (path) + 1 + strlen (listed_incremental_option) + 1 > PATH_MAX)
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ERROR ((TAREXIT_FAILURE, 0, _("File name %s/%s too long"),
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path, listed_incremental_option));
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strcat (path, "/");
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strcat (path, listed_incremental_option);
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listed_incremental_option = path;
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}
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fp = fopen (listed_incremental_option, "r");
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if (fp == 0 && errno != ENOENT)
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{
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ERROR ((0, errno, _("Cannot open %s"), listed_incremental_option));
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return;
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}
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if (!fp)
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return;
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fgets (buf, sizeof (buf), fp);
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/* FIXME: Using after_date_option as a first time flag looks fairly
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dubious to me! So, using -N with incremental might be buggy just
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because of the next few lines. I saw a few unexplained, almost harsh
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advices, from other GNU people, about *not* using -N with incremental
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dumps, and here might lie (part of) the reason. */
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if (!after_date_option)
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{
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newer_mtime_option = atol (buf);
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after_date_option = 1;
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}
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while (fgets (buf, sizeof (buf), fp))
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{
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strp = &buf[strlen (buf)];
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if (strp[-1] == '\n')
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strp[-1] = '\0';
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/* FIXME: For files ending with an incomplete line, maybe a NUL might
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be missing, here... */
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strp = buf;
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device_number = atol (strp);
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while (ISDIGIT (*strp))
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strp++;
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inode_number = atol (strp);
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while (ISSPACE (*strp))
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strp++;
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while (ISDIGIT (*strp))
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strp++;
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strp++;
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unquote_string (strp);
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note_directory (strp, device_number, inode_number, NULL);
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}
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if (fclose (fp) == EOF)
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ERROR ((0, errno, "%s", listed_incremental_option));
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}
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/*---.
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| ? |
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`---*/
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void
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write_dir_file (void)
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{
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FILE *fp;
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struct directory *directory;
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char *str;
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fp = fopen (listed_incremental_option, "w");
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if (fp == 0)
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{
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ERROR ((0, errno, _("Cannot write to %s"), listed_incremental_option));
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return;
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}
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fprintf (fp, "%lu\n", time_now);
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for (directory = directory_list; directory; directory = directory->next)
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{
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if (!directory->dir_text)
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continue;
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str = quote_copy_string (directory->name);
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if (str)
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{
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fprintf (fp, "%u %u %s\n", directory->device_number,
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directory->inode_number, str);
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free (str);
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}
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else
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fprintf (fp, "%u %u %s\n", directory->device_number,
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directory->inode_number, directory->name);
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}
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if (fclose (fp) == EOF)
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ERROR ((0, errno, "%s", listed_incremental_option));
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}
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/*---.
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| ? |
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`---*/
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static int
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compare_names (char *param1, char *param2)
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{
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struct name *n1 = (struct name *) param1;
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struct name *n2 = (struct name *) param2;
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if (n1->found)
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return n2->found ? strcmp (n1->name, n2->name) : -1;
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if (n2->found)
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return 1;
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return strcmp (n1->name, n2->name);
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}
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/*-------------------------------------------------------------------------.
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| Collect all the names from argv[] (or whatever), then expand them into a |
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| directory tree, and put all the directories at the beginning. |
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`-------------------------------------------------------------------------*/
|
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void
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collect_and_sort_names (void)
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{
|
||
struct name *name;
|
||
struct name *next_name;
|
||
int num_names;
|
||
struct stat statbuf;
|
||
|
||
name_gather ();
|
||
|
||
if (listed_incremental_option)
|
||
read_directory_file ();
|
||
|
||
if (!namelist)
|
||
addname (".");
|
||
|
||
for (name = namelist; name; name = next_name)
|
||
{
|
||
next_name = name->next;
|
||
if (name->found || name->dir_contents)
|
||
continue;
|
||
if (name->regexp) /* FIXME: just skip regexps for now */
|
||
continue;
|
||
if (name->change_dir)
|
||
if (chdir (name->change_dir) < 0)
|
||
{
|
||
ERROR ((0, errno, _("Cannot chdir to %s"), name->change_dir));
|
||
continue;
|
||
}
|
||
|
||
if (
|
||
#ifdef AIX
|
||
statx (name->name, &statbuf, STATSIZE, STX_HIDDEN | STX_LINK)
|
||
#else
|
||
lstat (name->name, &statbuf) < 0
|
||
#endif
|
||
)
|
||
{
|
||
ERROR ((0, errno, _("Cannot stat %s"), name->name));
|
||
continue;
|
||
}
|
||
if (S_ISDIR (statbuf.st_mode))
|
||
{
|
||
name->found = 1;
|
||
add_hierarchy_to_namelist (name->name, statbuf.st_dev);
|
||
}
|
||
}
|
||
|
||
num_names = 0;
|
||
for (name = namelist; name; name = name->next)
|
||
num_names++;
|
||
namelist = (struct name *)
|
||
merge_sort ((voidstar) namelist, num_names,
|
||
(char *) (&(namelist->next)) - (char *) namelist,
|
||
compare_names);
|
||
|
||
for (name = namelist; name; name = name->next)
|
||
name->found = 0;
|
||
|
||
if (listed_incremental_option)
|
||
write_dir_file ();
|
||
}
|
||
|
||
/* Restoration of incremental dumps. */
|
||
|
||
/*---.
|
||
| ? |
|
||
`---*/
|
||
|
||
void
|
||
gnu_restore (int skipcrud)
|
||
{
|
||
char *current_dir;
|
||
char *archive_dir;
|
||
struct accumulator *accumulator;
|
||
char *p;
|
||
DIR *dirp;
|
||
struct dirent *d;
|
||
char *cur, *arc;
|
||
long size, copied;
|
||
union block *data_block;
|
||
char *to;
|
||
|
||
#define CURRENT_FILE_NAME (skipcrud + current_file_name)
|
||
|
||
dirp = opendir (CURRENT_FILE_NAME);
|
||
|
||
if (!dirp)
|
||
{
|
||
/* The directory doesn't exist now. It'll be created. In any
|
||
case, we don't have to delete any files out of it. */
|
||
|
||
skip_file ((long) current_stat.st_size);
|
||
return;
|
||
}
|
||
|
||
accumulator = new_accumulator ();
|
||
while (d = readdir (dirp), d)
|
||
{
|
||
if (is_dot_or_dotdot (d->d_name))
|
||
continue;
|
||
|
||
add_to_accumulator (accumulator, d->d_name, (int) (NAMLEN (d) + 1));
|
||
}
|
||
closedir (dirp);
|
||
add_to_accumulator (accumulator, "", 1);
|
||
|
||
current_dir = get_accumulator (accumulator);
|
||
archive_dir = (char *) xmalloc ((size_t) current_stat.st_size);
|
||
to = archive_dir;
|
||
for (size = current_stat.st_size; size > 0; size -= copied)
|
||
{
|
||
data_block = find_next_block ();
|
||
if (!data_block)
|
||
{
|
||
ERROR ((0, 0, _("Unexpected EOF in archive")));
|
||
break; /* FIXME: What happens then? */
|
||
}
|
||
copied = available_space_after (data_block);
|
||
if (copied > size)
|
||
copied = size;
|
||
memcpy (to, data_block->buffer, (size_t) copied);
|
||
to += copied;
|
||
set_next_block_after ((union block *)
|
||
(data_block->buffer + copied - 1));
|
||
}
|
||
|
||
for (cur = current_dir; *cur; cur += strlen (cur) + 1)
|
||
{
|
||
for (arc = archive_dir; *arc; arc += strlen (arc) + 1)
|
||
{
|
||
arc++;
|
||
if (!strcmp (arc, cur))
|
||
break;
|
||
}
|
||
if (*arc == '\0')
|
||
{
|
||
p = new_name (CURRENT_FILE_NAME, cur);
|
||
if (interactive_option && !confirm ("delete", p))
|
||
{
|
||
free (p);
|
||
continue;
|
||
}
|
||
if (verbose_option)
|
||
fprintf (stdlis, _("%s: Deleting %s\n"), program_name, p);
|
||
if (!remove_any_file (p, 1))
|
||
ERROR ((0, errno, _("Error while deleting %s"), p));
|
||
free (p);
|
||
}
|
||
|
||
}
|
||
delete_accumulator (accumulator);
|
||
free (archive_dir);
|
||
|
||
#undef CURRENT_FILE_NAME
|
||
}
|