1/*
2 * Unsquash a squashfs filesystem.  This is a highly compressed read only
3 * filesystem.
4 *
5 * Copyright (c) 2010
6 * Phillip Lougher <phillip@lougher.demon.co.uk>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2,
11 * or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 *
22 * unsquashfs_xattr.c
23 */
24
25#include "unsquashfs.h"
26#include "xattr.h"
27
28#include <sys/xattr.h>
29
30extern int root_process;
31
32void write_xattr(char *pathname, unsigned int xattr)
33{
34	unsigned int count;
35	struct xattr_list *xattr_list;
36	int i;
37
38	if(xattr == SQUASHFS_INVALID_XATTR ||
39			sBlk.s.xattr_id_table_start == SQUASHFS_INVALID_BLK)
40		return;
41
42	xattr_list = get_xattr(xattr, &count);
43	if(xattr_list == NULL) {
44		ERROR("Failed to read xattrs for file %s\n", pathname);
45		return;
46	}
47
48	for(i = 0; i < count; i++) {
49		int prefix = xattr_list[i].type & SQUASHFS_XATTR_PREFIX_MASK;
50
51		if(root_process || prefix == SQUASHFS_XATTR_USER) {
52			int res = lsetxattr(pathname, xattr_list[i].full_name,
53				xattr_list[i].value, xattr_list[i].vsize, 0);
54
55			if(res == -1)
56				ERROR("write_xattr: failed to write xattr %s"
57					" for file %s because %s\n",
58					xattr_list[i].full_name, pathname,
59					errno == ENOSPC || errno == EDQUOT ?
60					"no extended attribute space remaining "
61					"on destination filesystem" :
62					errno == ENOTSUP ?
63					"extended attributes are not supported "
64					"by the destination filesystem" :
65					"a weird error occurred");
66		} else
67			ERROR("write_xattr: could not write xattr %s "
68					"for file %s because you're not "
69					"superuser!\n",
70					xattr_list[i].full_name, pathname);
71	}
72}
73