874 lines
19 KiB
C
874 lines
19 KiB
C
/* Miscellaneous functions, not really specific to GNU tar.
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Copyright (C) 1988, 1992, 1994, 1995, 1996, 1997, 1999, 2000, 2001,
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2003 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 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "system.h"
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#include "rmt.h"
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#include "common.h"
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#include <quotearg.h>
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#include <save-cwd.h>
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static void call_arg_fatal (char const *, char const *)
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__attribute__ ((noreturn));
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/* Handling strings. */
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/* Assign STRING to a copy of VALUE if not zero, or to zero. If
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STRING was nonzero, it is freed first. */
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void
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assign_string (char **string, const char *value)
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{
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if (*string)
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free (*string);
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*string = value ? xstrdup (value) : 0;
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}
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/* Allocate a copy of the string quoted as in C, and returns that. If
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the string does not have to be quoted, it returns a null pointer.
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The allocated copy should normally be freed with free() after the
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caller is done with it.
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This is used in one context only: generating the directory file in
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incremental dumps. The quoted string is not intended for human
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consumption; it is intended only for unquote_string. The quoting
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is locale-independent, so that users needn't worry about locale
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when reading directory files. This means that we can't use
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quotearg, as quotearg is locale-dependent and is meant for human
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consumption. */
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char *
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quote_copy_string (const char *string)
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{
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const char *source = string;
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char *destination = 0;
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char *buffer = 0;
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int copying = 0;
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while (*source)
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{
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int character = *source++;
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switch (character)
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{
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case '\n': case '\\':
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if (!copying)
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{
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size_t length = (source - string) - 1;
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copying = 1;
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buffer = xmalloc (length + 2 + 2 * strlen (source) + 1);
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memcpy (buffer, string, length);
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destination = buffer + length;
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}
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*destination++ = '\\';
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*destination++ = character == '\\' ? '\\' : 'n';
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break;
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default:
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if (copying)
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*destination++ = character;
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break;
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}
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}
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if (copying)
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{
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*destination = '\0';
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return buffer;
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}
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return 0;
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}
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/* Takes a quoted C string (like those produced by quote_copy_string)
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and turns it back into the un-quoted original. This is done in
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place. Returns 0 only if the string was not properly quoted, but
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completes the unquoting anyway.
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This is used for reading the saved directory file in incremental
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dumps. It is used for decoding old `N' records (demangling names).
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But also, it is used for decoding file arguments, would they come
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from the shell or a -T file, and for decoding the --exclude
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argument. */
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int
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unquote_string (char *string)
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{
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int result = 1;
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char *source = string;
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char *destination = string;
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/* Escape sequences other than \\ and \n are no longer generated by
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quote_copy_string, but accept them for backwards compatibility,
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and also because unquote_string is used for purposes other than
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parsing the output of quote_copy_string. */
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while (*source)
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if (*source == '\\')
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switch (*++source)
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{
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case '\\':
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*destination++ = '\\';
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source++;
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break;
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case 'n':
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*destination++ = '\n';
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source++;
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break;
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case 't':
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*destination++ = '\t';
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source++;
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break;
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case 'f':
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*destination++ = '\f';
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source++;
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break;
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case 'b':
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*destination++ = '\b';
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source++;
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break;
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case 'r':
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*destination++ = '\r';
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source++;
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break;
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case '?':
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*destination++ = 0177;
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source++;
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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{
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int value = *source++ - '0';
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if (*source < '0' || *source > '7')
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{
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*destination++ = value;
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break;
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}
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value = value * 8 + *source++ - '0';
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if (*source < '0' || *source > '7')
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{
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*destination++ = value;
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break;
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}
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value = value * 8 + *source++ - '0';
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*destination++ = value;
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break;
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}
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default:
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result = 0;
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*destination++ = '\\';
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if (*source)
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*destination++ = *source++;
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break;
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}
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else if (source != destination)
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*destination++ = *source++;
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else
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source++, destination++;
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if (source != destination)
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*destination = '\0';
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return result;
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}
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/* File handling. */
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/* Saved names in case backup needs to be undone. */
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static char *before_backup_name;
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static char *after_backup_name;
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/* Return 1 if PATH is obviously "." or "/". */
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static bool
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must_be_dot_or_slash (char const *path)
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{
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path += FILESYSTEM_PREFIX_LEN (path);
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if (ISSLASH (path[0]))
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{
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for (;;)
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if (ISSLASH (path[1]))
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path++;
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else if (path[1] == '.' && ISSLASH (path[2 + (path[2] == '.')]))
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path += 2 + (path[2] == '.');
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else
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return ! path[1];
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}
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else
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{
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while (path[0] == '.' && ISSLASH (path[1]))
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{
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path += 2;
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while (ISSLASH (*path))
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path++;
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}
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return ! path[0] || (path[0] == '.' && ! path[1]);
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}
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}
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/* Some implementations of rmdir let you remove '.' or '/'.
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Report an error with errno set to zero for obvious cases of this;
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otherwise call rmdir. */
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static int
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safer_rmdir (const char *path)
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{
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if (must_be_dot_or_slash (path))
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{
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errno = 0;
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return -1;
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}
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return rmdir (path);
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}
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/* Remove PATH, returning 1 on success. If PATH is a directory, then
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if OPTION is RECURSIVE_REMOVE_OPTION is set remove PATH
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recursively; otherwise, remove it only if it is empty. If PATH is
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a directory that cannot be removed (e.g., because it is nonempty)
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and if OPTION is WANT_DIRECTORY_REMOVE_OPTION, then return -1.
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Return 0 on error, with errno set; if PATH is obviously the working
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directory return zero with errno set to zero. */
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int
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remove_any_file (const char *path, enum remove_option option)
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{
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/* Try unlink first if we are not root, as this saves us a system
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call in the common case where we're removing a non-directory. */
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if (! we_are_root)
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{
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if (unlink (path) == 0)
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return 1;
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/* POSIX 1003.1-2001 requires EPERM when attempting to unlink a
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directory without appropriate privileges, but many Linux
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kernels return the more-sensible EISDIR. */
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if (errno != EPERM && errno != EISDIR)
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return 0;
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}
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if (safer_rmdir (path) == 0)
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return 1;
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switch (errno)
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{
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case ENOTDIR:
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return we_are_root && unlink (path) == 0;
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case 0:
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case EEXIST:
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#if defined ENOTEMPTY && ENOTEMPTY != EEXIST
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case ENOTEMPTY:
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#endif
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switch (option)
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{
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case ORDINARY_REMOVE_OPTION:
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break;
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case WANT_DIRECTORY_REMOVE_OPTION:
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return -1;
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case RECURSIVE_REMOVE_OPTION:
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{
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char *directory = savedir (path);
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char const *entry;
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size_t entrylen;
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if (! directory)
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return 0;
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for (entry = directory;
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(entrylen = strlen (entry)) != 0;
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entry += entrylen + 1)
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{
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char *path_buffer = new_name (path, entry);
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int r = remove_any_file (path_buffer, 1);
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int e = errno;
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free (path_buffer);
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if (! r)
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{
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free (directory);
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errno = e;
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return 0;
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}
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}
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free (directory);
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return safer_rmdir (path) == 0;
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}
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}
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break;
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}
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return 0;
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}
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/* Check if PATH already exists and make a backup of it right now.
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Return success (nonzero) only if the backup in either unneeded, or
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successful. For now, directories are considered to never need
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backup. If ARCHIVE is nonzero, this is the archive and so, we do
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not have to backup block or character devices, nor remote entities. */
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int
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maybe_backup_file (const char *path, int archive)
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{
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struct stat file_stat;
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/* Check if we really need to backup the file. */
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if (archive && _remdev (path))
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return 1;
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if (stat (path, &file_stat))
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{
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if (errno == ENOENT)
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return 1;
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stat_error (path);
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return 0;
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}
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if (S_ISDIR (file_stat.st_mode))
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return 1;
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if (archive && (S_ISBLK (file_stat.st_mode) || S_ISCHR (file_stat.st_mode)))
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return 1;
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assign_string (&before_backup_name, path);
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/* A run situation may exist between Emacs or other GNU programs trying to
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make a backup for the same file simultaneously. If theoretically
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possible, real problems are unlikely. Doing any better would require a
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convention, GNU-wide, for all programs doing backups. */
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assign_string (&after_backup_name, 0);
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after_backup_name = find_backup_file_name (path, backup_type);
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if (! after_backup_name)
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xalloc_die ();
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if (rename (before_backup_name, after_backup_name) == 0)
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{
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if (verbose_option)
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fprintf (stdlis, _("Renaming %s to %s\n"),
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quote_n (0, before_backup_name),
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quote_n (1, after_backup_name));
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return 1;
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}
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else
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{
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/* The backup operation failed. */
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int e = errno;
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ERROR ((0, e, _("%s: Cannot rename to %s"),
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quotearg_colon (before_backup_name),
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quote_n (1, after_backup_name)));
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assign_string (&after_backup_name, 0);
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return 0;
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}
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}
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/* Try to restore the recently backed up file to its original name.
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This is usually only needed after a failed extraction. */
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void
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undo_last_backup (void)
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{
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if (after_backup_name)
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{
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if (rename (after_backup_name, before_backup_name) != 0)
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{
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int e = errno;
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ERROR ((0, e, _("%s: Cannot rename to %s"),
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quotearg_colon (after_backup_name),
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quote_n (1, before_backup_name)));
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}
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if (verbose_option)
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fprintf (stdlis, _("Renaming %s back to %s\n"),
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quote_n (0, after_backup_name),
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quote_n (1, before_backup_name));
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assign_string (&after_backup_name, 0);
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}
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}
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/* Depending on DEREF, apply either stat or lstat to (NAME, BUF). */
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int
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deref_stat (bool deref, char const *name, struct stat *buf)
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{
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return deref ? stat (name, buf) : lstat (name, buf);
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}
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/* A description of a working directory. */
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struct wd
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{
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char const *name;
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int saved;
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struct saved_cwd saved_cwd;
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};
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/* A vector of chdir targets. wd[0] is the initial working directory. */
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static struct wd *wd;
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/* The number of working directories in the vector. */
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static size_t wds;
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/* The allocated size of the vector. */
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static size_t wd_alloc;
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/* DIR is the operand of a -C option; add it to vector of chdir targets,
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and return the index of its location. */
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int
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chdir_arg (char const *dir)
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{
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if (wds == wd_alloc)
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{
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wd_alloc = 2 * (wd_alloc + 1);
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wd = xrealloc (wd, sizeof *wd * wd_alloc);
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if (! wds)
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{
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wd[wds].name = ".";
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wd[wds].saved = 0;
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wds++;
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}
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}
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/* Optimize the common special case of the working directory,
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or the working directory as a prefix. */
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if (dir[0])
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{
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while (dir[0] == '.' && ISSLASH (dir[1]))
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for (dir += 2; ISSLASH (*dir); dir++)
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continue;
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if (! dir[dir[0] == '.'])
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return wds - 1;
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}
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wd[wds].name = dir;
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wd[wds].saved = 0;
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return wds++;
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}
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/* Change to directory I. If I is 0, change to the initial working
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directory; otherwise, I must be a value returned by chdir_arg. */
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void
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chdir_do (int i)
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{
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static int previous;
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if (previous != i)
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{
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struct wd *prev = &wd[previous];
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struct wd *curr = &wd[i];
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if (! prev->saved)
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{
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prev->saved = 1;
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if (save_cwd (&prev->saved_cwd) != 0)
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FATAL_ERROR ((0, 0, _("Cannot save working directory")));
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}
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if (curr->saved)
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{
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if (restore_cwd (&curr->saved_cwd))
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FATAL_ERROR ((0, 0, _("Cannot change working directory")));
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}
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else
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{
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if (i && ! ISSLASH (curr->name[0]))
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chdir_do (i - 1);
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if (chdir (curr->name) != 0)
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chdir_fatal (curr->name);
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}
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previous = i;
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}
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}
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/* Decode MODE from its binary form in a stat structure, and encode it
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into a 9-byte string STRING, terminated with a NUL. */
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void
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decode_mode (mode_t mode, char *string)
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{
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*string++ = mode & S_IRUSR ? 'r' : '-';
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*string++ = mode & S_IWUSR ? 'w' : '-';
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*string++ = (mode & S_ISUID
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? (mode & S_IXUSR ? 's' : 'S')
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: (mode & S_IXUSR ? 'x' : '-'));
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*string++ = mode & S_IRGRP ? 'r' : '-';
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*string++ = mode & S_IWGRP ? 'w' : '-';
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*string++ = (mode & S_ISGID
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? (mode & S_IXGRP ? 's' : 'S')
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: (mode & S_IXGRP ? 'x' : '-'));
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*string++ = mode & S_IROTH ? 'r' : '-';
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*string++ = mode & S_IWOTH ? 'w' : '-';
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*string++ = (mode & S_ISVTX
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? (mode & S_IXOTH ? 't' : 'T')
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: (mode & S_IXOTH ? 'x' : '-'));
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*string = '\0';
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}
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/* Report an error associated with the system call CALL and the
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optional name NAME. */
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static void
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call_arg_error (char const *call, char const *name)
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{
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int e = errno;
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ERROR ((0, e, _("%s: Cannot %s"), quotearg_colon (name), call));
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}
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/* Report a fatal error associated with the system call CALL and
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the optional file name NAME. */
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static void
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call_arg_fatal (char const *call, char const *name)
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{
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int e = errno;
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FATAL_ERROR ((0, e, _("%s: Cannot %s"), quotearg_colon (name), call));
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}
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/* Report a warning associated with the system call CALL and
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the optional file name NAME. */
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static void
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call_arg_warn (char const *call, char const *name)
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{
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int e = errno;
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WARN ((0, e, _("%s: Warning: Cannot %s"), quotearg_colon (name), call));
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}
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void
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chdir_fatal (char const *name)
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{
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call_arg_fatal ("chdir", name);
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}
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void
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chmod_error_details (char const *name, mode_t mode)
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{
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int e = errno;
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char buf[10];
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decode_mode (mode, buf);
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ERROR ((0, e, _("%s: Cannot change mode to %s"),
|
||
quotearg_colon (name), buf));
|
||
}
|
||
|
||
void
|
||
chown_error_details (char const *name, uid_t uid, gid_t gid)
|
||
{
|
||
int e = errno;
|
||
ERROR ((0, e, _("%s: Cannot change ownership to uid %lu, gid %lu"),
|
||
quotearg_colon (name), (unsigned long) uid, (unsigned long) gid));
|
||
}
|
||
|
||
void
|
||
close_error (char const *name)
|
||
{
|
||
call_arg_error ("close", name);
|
||
}
|
||
|
||
void
|
||
close_fatal (char const *name)
|
||
{
|
||
call_arg_fatal ("close", name);
|
||
}
|
||
|
||
void
|
||
close_warn (char const *name)
|
||
{
|
||
call_arg_warn ("close", name);
|
||
}
|
||
|
||
void
|
||
exec_fatal (char const *name)
|
||
{
|
||
call_arg_fatal ("exec", name);
|
||
}
|
||
|
||
void
|
||
link_error (char const *target, char const *source)
|
||
{
|
||
int e = errno;
|
||
ERROR ((0, e, _("%s: Cannot hard link to %s"),
|
||
quotearg_colon (source), quote_n (1, target)));
|
||
}
|
||
|
||
void
|
||
mkdir_error (char const *name)
|
||
{
|
||
call_arg_error ("mkdir", name);
|
||
}
|
||
|
||
void
|
||
mkfifo_error (char const *name)
|
||
{
|
||
call_arg_error ("mkfifo", name);
|
||
}
|
||
|
||
void
|
||
mknod_error (char const *name)
|
||
{
|
||
call_arg_error ("mknod", name);
|
||
}
|
||
|
||
void
|
||
open_error (char const *name)
|
||
{
|
||
call_arg_error ("open", name);
|
||
}
|
||
|
||
void
|
||
open_fatal (char const *name)
|
||
{
|
||
call_arg_fatal ("open", name);
|
||
}
|
||
|
||
void
|
||
open_warn (char const *name)
|
||
{
|
||
call_arg_warn ("open", name);
|
||
}
|
||
|
||
void
|
||
read_error (char const *name)
|
||
{
|
||
call_arg_error ("read", name);
|
||
}
|
||
|
||
void
|
||
read_error_details (char const *name, off_t offset, size_t size)
|
||
{
|
||
char buf[UINTMAX_STRSIZE_BOUND];
|
||
int e = errno;
|
||
ERROR ((0, e,
|
||
ngettext ("%s: Read error at byte %s, reading %lu byte",
|
||
"%s: Read error at byte %s, reading %lu bytes",
|
||
size),
|
||
quotearg_colon (name), STRINGIFY_BIGINT (offset, buf),
|
||
(unsigned long) size));
|
||
}
|
||
|
||
void
|
||
read_warn_details (char const *name, off_t offset, size_t size)
|
||
{
|
||
char buf[UINTMAX_STRSIZE_BOUND];
|
||
int e = errno;
|
||
WARN ((0, e,
|
||
ngettext ("%s: Warning: Read error at byte %s, reading %lu byte",
|
||
"%s: Warning: Read error at byte %s, reading %lu bytes",
|
||
size),
|
||
quotearg_colon (name), STRINGIFY_BIGINT (offset, buf),
|
||
(unsigned long) size));
|
||
}
|
||
|
||
void
|
||
read_fatal (char const *name)
|
||
{
|
||
call_arg_fatal ("read", name);
|
||
}
|
||
|
||
void
|
||
read_fatal_details (char const *name, off_t offset, size_t size)
|
||
{
|
||
char buf[UINTMAX_STRSIZE_BOUND];
|
||
int e = errno;
|
||
FATAL_ERROR ((0, e,
|
||
ngettext ("%s: Read error at byte %s, reading %lu byte",
|
||
"%s: Read error at byte %s, reading %lu bytes",
|
||
size),
|
||
quotearg_colon (name), STRINGIFY_BIGINT (offset, buf),
|
||
(unsigned long) size));
|
||
}
|
||
|
||
void
|
||
readlink_error (char const *name)
|
||
{
|
||
call_arg_error ("readlink", name);
|
||
}
|
||
|
||
void
|
||
readlink_warn (char const *name)
|
||
{
|
||
call_arg_warn ("readlink", name);
|
||
}
|
||
|
||
void
|
||
savedir_error (char const *name)
|
||
{
|
||
call_arg_error ("savedir", name);
|
||
}
|
||
|
||
void
|
||
savedir_warn (char const *name)
|
||
{
|
||
call_arg_warn ("savedir", name);
|
||
}
|
||
|
||
void
|
||
seek_error (char const *name)
|
||
{
|
||
call_arg_error ("seek", name);
|
||
}
|
||
|
||
void
|
||
seek_error_details (char const *name, off_t offset)
|
||
{
|
||
char buf[UINTMAX_STRSIZE_BOUND];
|
||
int e = errno;
|
||
ERROR ((0, e, _("%s: Cannot seek to %s"),
|
||
quotearg_colon (name),
|
||
STRINGIFY_BIGINT (offset, buf)));
|
||
}
|
||
|
||
void
|
||
seek_warn (char const *name)
|
||
{
|
||
call_arg_warn ("seek", name);
|
||
}
|
||
|
||
void
|
||
seek_warn_details (char const *name, off_t offset)
|
||
{
|
||
char buf[UINTMAX_STRSIZE_BOUND];
|
||
int e = errno;
|
||
WARN ((0, e, _("%s: Warning: Cannot seek to %s"),
|
||
quotearg_colon (name),
|
||
STRINGIFY_BIGINT (offset, buf)));
|
||
}
|
||
|
||
void
|
||
symlink_error (char const *contents, char const *name)
|
||
{
|
||
int e = errno;
|
||
ERROR ((0, e, _("%s: Cannot create symlink to %s"),
|
||
quotearg_colon (name), quote_n (1, contents)));
|
||
}
|
||
|
||
void
|
||
stat_error (char const *name)
|
||
{
|
||
call_arg_error ("stat", name);
|
||
}
|
||
|
||
void
|
||
stat_warn (char const *name)
|
||
{
|
||
call_arg_warn ("stat", name);
|
||
}
|
||
|
||
void
|
||
truncate_error (char const *name)
|
||
{
|
||
call_arg_error ("truncate", name);
|
||
}
|
||
|
||
void
|
||
truncate_warn (char const *name)
|
||
{
|
||
call_arg_warn ("truncate", name);
|
||
}
|
||
|
||
void
|
||
unlink_error (char const *name)
|
||
{
|
||
call_arg_error ("unlink", name);
|
||
}
|
||
|
||
void
|
||
utime_error (char const *name)
|
||
{
|
||
call_arg_error ("utime", name);
|
||
}
|
||
|
||
void
|
||
waitpid_error (char const *name)
|
||
{
|
||
call_arg_error ("waitpid", name);
|
||
}
|
||
|
||
void
|
||
write_error (char const *name)
|
||
{
|
||
call_arg_error ("write", name);
|
||
}
|
||
|
||
void
|
||
write_error_details (char const *name, ssize_t status, size_t size)
|
||
{
|
||
if (status < 0)
|
||
write_error (name);
|
||
else
|
||
ERROR ((0, 0,
|
||
ngettext ("%s: Wrote only %lu of %lu byte",
|
||
"%s: Wrote only %lu of %lu bytes",
|
||
record_size),
|
||
name, (unsigned long) status, (unsigned long) record_size));
|
||
}
|
||
|
||
void
|
||
write_fatal (char const *name)
|
||
{
|
||
call_arg_fatal ("write", name);
|
||
}
|
||
|
||
void
|
||
write_fatal_details (char const *name, ssize_t status, size_t size)
|
||
{
|
||
write_error_details (name, status, size);
|
||
fatal_exit ();
|
||
}
|
||
|
||
|
||
/* Fork, aborting if unsuccessful. */
|
||
pid_t
|
||
xfork (void)
|
||
{
|
||
pid_t p = fork ();
|
||
if (p == (pid_t) -1)
|
||
call_arg_fatal ("fork", _("child process"));
|
||
return p;
|
||
}
|
||
|
||
/* Create a pipe, aborting if unsuccessful. */
|
||
void
|
||
xpipe (int fd[2])
|
||
{
|
||
if (pipe (fd) < 0)
|
||
call_arg_fatal ("pipe", _("interprocess channel"));
|
||
}
|
||
|
||
/* Return an unambiguous printable representation, allocated in slot N,
|
||
for NAME, suitable for diagnostics. */
|
||
char const *
|
||
quote_n (int n, char const *name)
|
||
{
|
||
return quotearg_n_style (n, locale_quoting_style, name);
|
||
}
|
||
|
||
/* Return an unambiguous printable representation of NAME, suitable
|
||
for diagnostics. */
|
||
char const *
|
||
quote (char const *name)
|
||
{
|
||
return quote_n (0, name);
|
||
}
|