1  /*
       2    Copyright (C) 2009  Andreas Gruenbacher <agruen@suse.de>
       3  
       4    This program is free software: you can redistribute it and/or modify it
       5    under the terms of the GNU General Public License as published by
       6    the Free Software Foundation, either version 2 of the License, or
       7    (at your option) any later version.
       8  
       9    This program is distributed in the hope that it will be useful,
      10    but WITHOUT ANY WARRANTY; without even the implied warranty of
      11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12    GNU General Public License for more details.
      13  
      14    You should have received a copy of the GNU General Public License
      15    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      16   */
      17  
      18  /*
      19   * Example how to preserve Extended Attributes in file manager style
      20   * applications. This does NOT also copy Access Control Lists!
      21   *
      22   * Andreas Gruenbacher, SuSE Labs, SuSE Linux AG
      23   * 23 January 2003
      24   */
      25  
      26  #include "config.h"
      27  
      28  #include <sys/stat.h>
      29  #include <stdlib.h>
      30  #include <stdio.h>
      31  #include <string.h>
      32  #include <errno.h>
      33  #include <stdarg.h>
      34  #include <locale.h>
      35  /* #include <libintl.h> */
      36  #ifdef HAVE_ATTR_ERROR_CONTEXT_H
      37  # include <attr/error_context.h>
      38  #endif
      39  #ifdef HAVE_ATTR_LIBATTR_H
      40  # include <attr/libattr.h>
      41  #endif
      42  
      43  /*
      44   * We don't fully internationalize this example!
      45   */
      46  #define _(msg) (msg)
      47  
      48  /*
      49   * Optional error handler for attr_copy_file(). CTX is the error
      50   * context passed to attr_copy_file(), ERR is the errno value
      51   * that occurred. FMT and the rest are printf style arguments.
      52   */
      53  static void
      54  error(struct error_context *ctx, const char *fmt, ...)
      55  {
      56  	va_list ap;
      57  
      58  	va_start(ap, fmt);
      59  	if (vfprintf(stderr, fmt, ap))
      60  		fprintf(stderr, ": ");
      61  	fprintf(stderr, "%s\n", strerror(errno));
      62  	va_end(ap);
      63  }
      64  
      65  /*
      66   * Optional handler for quoting path names in error messages.
      67   * (This is a very stupid example!)
      68   */
      69  static const char *
      70  quote(struct error_context *ctx, const char *pathname)
      71  {
      72  	char *pn = strdup(pathname), *p;
      73  	pathname = strdup(pathname);
      74  	for (p = pn; *p != '\0'; p++)
      75  		if (*p & 0x80)
      76  			*p='?';
      77  	return pn;
      78  }
      79  
      80  static void
      81  quote_free(struct error_context *ctx, const char *name)
      82  {
      83  	free((void *)name);
      84  }
      85  
      86  /*
      87   * The error context we pass to attr_copy_file().
      88   */
      89  struct error_context ctx = { error, quote, quote_free };
      90  
      91  /*
      92   * Optional attribute filter for attr_copy_file(). This example
      93   * excludes all attributes other than extended user attributes.
      94   */
      95  static int is_user_attr(const char *name, struct error_context *ctx)
      96  {
      97  	return strcmp(name, "user.") == 0;
      98  }
      99  
     100  int
     101  main(int argc, char *argv[])
     102  {
     103  	int ret;
     104  
     105  	/*
     106  	 * Set the locale to enable message translation
     107  	 */
     108  	setlocale(LC_MESSAGES, "");
     109  	setlocale(LC_CTYPE, "");
     110  
     111  	if (argc != 3) {
     112  		fprintf(stderr, _("Usage: %s from to\n"), argv[0]);
     113  		exit(1);
     114  	}
     115  
     116  #if defined(HAVE_ATTR_COPY_FILE)
     117  	/*
     118  	 * If the third parameter is NULL, all extended attributes
     119  	 * except those that define Access Control Lists are copied.
     120  	 * ACLs are excluded by default because copying them between
     121  	 * file systems with and without ACL support needs some
     122  	 * additional logic so that no unexpected permissions result.
     123  	 *
     124  	 * For copying ACLs, please use perm_copy_file() from libacl.
     125  	 *
     126  	 * The CTX parameter could also be NULL, in which case attr_copy_file
     127  	 * would print no error messages.
     128  	 */
     129  	ret = attr_copy_file(argv[1], argv[2], is_user_attr, &ctx);
     130  #else
     131  	fprintf(stderr, _("No support for copying extended attributes\n"));
     132  	ret = -1;
     133  #endif
     134  
     135  	if (ret != 0)
     136  		return EXIT_FAILURE;
     137  	return EXIT_SUCCESS;
     138  }
     139