mirror of https://github.com/ventoy/Ventoy
145 lines
4.4 KiB
C
145 lines
4.4 KiB
C
/*
|
|
* Unsquash a squashfs filesystem. This is a highly compressed read only
|
|
* filesystem.
|
|
*
|
|
* Copyright (c) 2010, 2012, 2019
|
|
* Phillip Lougher <phillip@squashfs.org.uk>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2,
|
|
* or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
* unsquashfs_xattr.c
|
|
*/
|
|
|
|
#include "unsquashfs.h"
|
|
#include "xattr.h"
|
|
|
|
#include <sys/xattr.h>
|
|
|
|
#define NOSPACE_MAX 10
|
|
|
|
extern int root_process;
|
|
extern int user_xattrs;
|
|
extern int ignore_errors;
|
|
extern int strict_errors;
|
|
|
|
int write_xattr(char *pathname, unsigned int xattr)
|
|
{
|
|
unsigned int count;
|
|
struct xattr_list *xattr_list;
|
|
int i;
|
|
static int nonsuper_error = FALSE;
|
|
static int ignore_xattrs = FALSE;
|
|
static int nospace_error = 0;
|
|
int failed;
|
|
|
|
if(ignore_xattrs || xattr == SQUASHFS_INVALID_XATTR ||
|
|
sBlk.s.xattr_id_table_start == SQUASHFS_INVALID_BLK)
|
|
return TRUE;
|
|
|
|
xattr_list = get_xattr(xattr, &count, &failed);
|
|
if(failed)
|
|
EXIT_UNSQUASH_STRICT("write_xattr: Failed to read one or more xattrs for %s\n", pathname);
|
|
|
|
for(i = 0; i < count; i++) {
|
|
int prefix = xattr_list[i].type & SQUASHFS_XATTR_PREFIX_MASK;
|
|
|
|
if(ignore_xattrs || (user_xattrs && prefix != SQUASHFS_XATTR_USER))
|
|
continue;
|
|
|
|
if(root_process || prefix == SQUASHFS_XATTR_USER) {
|
|
int res = lsetxattr(pathname, xattr_list[i].full_name,
|
|
xattr_list[i].value, xattr_list[i].vsize, 0);
|
|
|
|
if(res == -1) {
|
|
if(errno == ENOTSUP) {
|
|
/*
|
|
* If the destination filesystem cannot
|
|
* suppport xattrs, print error, and
|
|
* disable xattr output as this error is
|
|
* unlikely to go away, and printing
|
|
* screenfulls of the same error message
|
|
* is rather annoying
|
|
*/
|
|
ERROR("write_xattr: failed to write "
|
|
"xattr %s for file %s because "
|
|
"extended attributes are not "
|
|
"supported by the destination "
|
|
"filesystem\n",
|
|
xattr_list[i].full_name,
|
|
pathname);
|
|
ERROR("Ignoring xattrs in "
|
|
"filesystem\n");
|
|
EXIT_UNSQUASH_STRICT("To avoid this error message, "
|
|
"specify -no-xattrs\n");
|
|
ignore_xattrs = TRUE;
|
|
} else if((errno == ENOSPC || errno == EDQUOT)
|
|
&& nospace_error < NOSPACE_MAX) {
|
|
/*
|
|
* Many filesystems like ext2/3/4 have
|
|
* limits on the amount of xattr
|
|
* data that can be stored per file
|
|
* (typically one block or 4K), so
|
|
* we shouldn't disable xattr ouput,
|
|
* as the error may be restriced to one
|
|
* file only. If we get a lot of these
|
|
* then suppress the error messsage
|
|
*/
|
|
EXIT_UNSQUASH_IGNORE("write_xattr: failed to write "
|
|
"xattr %s for file %s because "
|
|
"no extended attribute space "
|
|
"remaining (per file or "
|
|
"filesystem limit)\n",
|
|
xattr_list[i].full_name,
|
|
pathname);
|
|
if(++ nospace_error == NOSPACE_MAX)
|
|
ERROR("%d of these errors "
|
|
"printed, further error "
|
|
"messages of this type "
|
|
"are suppressed!\n",
|
|
NOSPACE_MAX);
|
|
} else
|
|
EXIT_UNSQUASH_IGNORE("write_xattr: failed to write "
|
|
"xattr %s for file %s because "
|
|
"%s\n", xattr_list[i].full_name,
|
|
pathname, strerror(errno));
|
|
failed = TRUE;
|
|
}
|
|
} else if(nonsuper_error == FALSE) {
|
|
/*
|
|
* if extract user xattrs only then
|
|
* error message is suppressed, if not
|
|
* print error, and then suppress further error
|
|
* messages to avoid possible screenfulls of the
|
|
* same error message!
|
|
*/
|
|
ERROR("write_xattr: could not write xattr %s "
|
|
"for file %s because you're not "
|
|
"superuser!\n",
|
|
xattr_list[i].full_name, pathname);
|
|
EXIT_UNSQUASH_STRICT("write_xattr: to avoid this error message, either"
|
|
" specify -user-xattrs, -no-xattrs, or run as "
|
|
"superuser!\n");
|
|
ERROR("Further error messages of this type are "
|
|
"suppressed!\n");
|
|
nonsuper_error = TRUE;
|
|
failed = TRUE;
|
|
}
|
|
}
|
|
|
|
free_xattr(xattr_list, count);
|
|
|
|
return !failed;
|
|
}
|