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/* Copy extended attributes between files. */
/* Copyright (C) 2002 Andreas Gruenbacher <agruen@suse.de>, SuSE Linux AG.
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; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#if defined (HAVE_CONFIG_H)
#include "config.h"
#endif
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#if defined(HAVE_ALLOCA_H)
# include <alloca.h>
#endif
#if defined(HAVE_ATTR_XATTR_H)
# include <attr/xattr.h>
#endif
#if defined(HAVE_ATTR_LIBATTR_H)
# include "attr/libattr.h"
#endif
#define ERROR_CONTEXT_MACROS
#include "error_context.h"
#if !defined(ENOTSUP)
# define ENOTSUP (-1)
#endif
#if defined(HAVE_ALLOCA)
# define my_alloc(size) alloca (size)
# define my_free(ptr) do { } while(0)
#else
# define my_alloc(size) malloc (size)
# define my_free(ptr) free (ptr)
#endif
/* Copy extended attributes from src_path to dst_path. If the file
has an extended Access ACL (system.posix_acl_access) and that is
copied successfully, the file mode permission bits are copied as
a side effect. This may not always the case, so the file mode
and/or ownership must be copied separately. */
int
attr_copy_fd(const char *src_path, int src_fd,
const char *dst_path, int dst_fd,
int (*check) (const char *, struct error_context *),
struct error_context *ctx)
{
#if defined(HAVE_FLISTXATTR) && defined(HAVE_FGETXATTR) && \
defined(HAVE_FSETXATTR)
int ret = 0;
ssize_t size;
char *names = NULL, *end_names, *name, *value = NULL;
/* ignore acls by default */
if (check == NULL)
check = attr_copy_check_permissions;
size = flistxattr (src_fd, NULL, 0);
if (size < 0) {
if (errno != ENOSYS && errno != ENOTSUP) {
const char *qpath = quote (ctx, src_path);
error (ctx, _("listing attributes of %s"), qpath);
quote_free (ctx, qpath);
ret = -1;
}
goto getout;
}
names = (char *) my_alloc (size+1);
if (names == NULL) {
error (ctx, "");
ret = -1;
goto getout;
}
size = flistxattr (src_fd, names, size);
if (size < 0) {
const char *qpath = quote (ctx, src_path);
error (ctx, _("listing attributes of %s"), qpath);
quote_free (ctx, qpath);
my_free (names);
ret = -1;
goto getout;
} else {
names[size] = '\0';
end_names = names + size;
}
for (name = names; name != end_names; name = strchr(name, '\0') + 1) {
void *old_value;
/* check if this attribute shall be preserved */
if (!*name || !check(name, ctx))
continue;
size = fgetxattr (src_fd, name, NULL, 0);
if (size < 0) {
const char *qpath = quote (ctx, src_path);
const char *qname = quote (ctx, name);
error (ctx, _("getting attribute %s of %s"),
qpath, qname);
quote_free (ctx, qname);
quote_free (ctx, qpath);
ret = -1;
continue; /* may not have permission to access */
}
value = (char *) realloc (old_value = value, size);
if (size != 0 && value == NULL) {
free(old_value);
error (ctx, "");
ret = -1;
}
size = fgetxattr (src_fd, name, value, size);
if (size < 0) {
const char *qpath = quote (ctx, src_path);
const char *qname = quote (ctx, name);
error (ctx, _("getting attribute %s of %s"),
qname, qpath);
quote_free (ctx, qname);
quote_free (ctx, qpath);
ret = -1;
}
if (fsetxattr (dst_fd, name, value, size, 0) != 0)
{
const char *qpath = quote (ctx, dst_path);
if (errno == ENOSYS) {
error (ctx, _("setting attributes for %s"),
qpath);
ret = -1;
break; /* no hope of getting any further */
} else {
const char *qname = quote (ctx, name);
error (ctx, _("setting attribute %s for %s"),
qname, qpath);
quote_free (ctx, qname);
ret = -1;
}
quote_free (ctx, qpath);
}
}
getout:
free (value);
my_free (names);
return ret;
#else
return 0;
#endif
}
|
