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Use correct headers/libraries when providing xattr support

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See https://savannah.gnu.org/patch/index.php?8252. Patch provided
by Anthony G. Basile.

* acinclude.m4 (TAR_HEADERS_ATTR_XATTR_H): Look for <sys/xattr.h>
first and then for <attr/xattr.h>.  Link against libattr.so if
needed.
* lib/xattr-at.h: Include sys/xattr.h or attr/xattr.h, depending
on which one is detected.
* src/Makefile.am [TAR_LIB_ATTR] (tar_LDADD): Link against -lattr.
This commit is contained in:
Sergey Poznyakoff
2014-02-14 10:55:26 +02:00
parent 46da9968df
commit 48a546b02c
3 changed files with 40 additions and 6 deletions
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32
acinclude.m4
View File

@@ -37,18 +37,40 @@ AC_DEFUN([TAR_HEADERS_ATTR_XATTR_H],
[], [with_xattrs=maybe]
)
AC_CHECK_HEADERS([attr/xattr.h])
AM_CONDITIONAL([TAR_COND_XATTR_H],[test "$ac_cv_header_attr_xattr_h" = yes])
if test "$ac_cv_header_attr_xattr_h" = yes; then
# First check for <sys/xattr.h>
AC_CHECK_HEADERS([sys/xattr.h])
AM_CONDITIONAL([TAR_COND_XATTR_H],[test "$ac_cv_header_sys_xattr_h" = yes])
AM_CONDITIONAL([TAR_LIB_ATTR],[false])
if test "$ac_cv_header_sys_xattr_h" = yes; then
AC_CHECK_FUNCS(getxattr fgetxattr lgetxattr \
setxattr fsetxattr lsetxattr \
listxattr flistxattr llistxattr,
# only when functions are present
AC_DEFINE([HAVE_ATTR_XATTR_H], [1],
[define to 1 if we have <attr/xattr.h> header])
AC_DEFINE([HAVE_SYS_XATTR_H], [1],
[define to 1 if we have <sys/xattr.h> header])
if test "$with_xattrs" != no; then
AC_DEFINE([HAVE_XATTRS],,[Define when we have working linux xattrs.])
fi
)
fi
# If <sys/xattr.h> is not found, then check for <attr/xattr.h>
if test "$ac_cv_header_sys_xattr_h" != yes; then
AC_CHECK_HEADERS([attr/xattr.h])
AM_CONDITIONAL([TAR_COND_XATTR_H],[test "$ac_cv_header_attr_xattr_h" = yes])
AC_CHECK_LIB([attr],[fgetxattr])
AM_CONDITIONAL([TAR_LIB_ATTR],[test "$ac_cv_lib_attr_fgetxattr" = yes])
if test "$ac_cv_header_attr_xattr_h" = yes; then
AC_CHECK_FUNCS(getxattr fgetxattr lgetxattr \
setxattr fsetxattr lsetxattr \
listxattr flistxattr llistxattr,
# only when functions are present
AC_DEFINE([HAVE_ATTR_XATTR_H], [1],
[define to 1 if we have <attr/xattr.h> header])
if test "$with_xattrs" != no; then
AC_DEFINE([HAVE_XATTRS],,[Define when we have working linux xattrs.])
fi
)
fi
fi
])

10
lib/xattr-at.h
View File

@@ -20,7 +20,15 @@
#define XATTRS_AT_H
#include <sys/types.h>
#include <attr/xattr.h>
#if defined(HAVE_SYS_XATTR_H)
# include <sys/xattr.h>
#elif defined(HAVE_ATTR_XATTR_H)
# include <attr/xattr.h>
#endif
#ifndef ENOATTR
# define ENOATTR ENODATA /* No such attribute */
#endif
/* These are the dir-fd-relative variants of the functions without the
"at" suffix. For example, setxattrat (AT_FDCWD, path, name, value, size,

4
src/Makefile.am
View File

@@ -51,3 +51,7 @@ AM_CFLAGS = $(WARN_CFLAGS) $(WERROR_CFLAGS)
LDADD = ../lib/libtar.a ../gnu/libgnu.a $(LIBINTL) $(LIBICONV)
tar_LDADD = $(LIBS) $(LDADD) $(LIB_CLOCK_GETTIME) $(LIB_EACCESS) $(LIB_SELINUX)
if TAR_LIB_ATTR
tar_LDADD += -lattr
endif