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