# acl.m4 - check for access control list (ACL) primitives
-# serial 15
+# serial 22
-# Copyright (C) 2002, 2004-2013 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2004-2016 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
# Written by Paul Eggert and Jim Meyering.
-AC_DEFUN([gl_FUNC_ACL],
+AC_DEFUN([gl_FUNC_ACL_ARG],
[
+ gl_need_lib_has_acl=
AC_ARG_ENABLE([acl],
AS_HELP_STRING([--disable-acl], [do not support ACLs]),
, [enable_acl=auto])
+])
+
+AC_DEFUN([gl_FUNC_ACL],
+[
+ AC_REQUIRE([gl_FUNC_ACL_ARG])
+ AC_CHECK_FUNCS_ONCE([fchmod])
LIB_ACL=
use_acl=0
- if test "x$enable_acl" != "xno"; then
+ if test "$enable_acl" != no; then
dnl On all platforms, the ACL related API is declared in <sys/acl.h>.
AC_CHECK_HEADERS([sys/acl.h])
if test $ac_cv_header_sys_acl_h = yes; then
ac_save_LIBS=$LIBS
- dnl Test for POSIX-draft-like API (Linux, FreeBSD, Mac OS X, IRIX, Tru64).
- dnl -lacl is needed on Linux, -lpacl is needed on OSF/1.
+ dnl Test for POSIX-draft-like API (GNU/Linux, FreeBSD, Mac OS X,
+ dnl IRIX, Tru64). -lacl is needed on GNU/Linux, -lpacl on OSF/1.
if test $use_acl = 0; then
AC_SEARCH_LIBS([acl_get_file], [acl pacl],
[if test "$ac_cv_search_acl_get_file" != "none required"; then
# If the acl_get_file bug is detected, don't enable the ACL support.
gl_ACL_GET_FILE([use_acl=1], [])
if test $use_acl = 1; then
- dnl On
Linux, additional API is declared in <acl/libacl.h>.
+ dnl On
GNU/Linux, an additional API is declared in <acl/libacl.h>.
AC_CHECK_HEADERS([acl/libacl.h])
AC_REPLACE_FUNCS([acl_entries])
AC_CACHE_CHECK([for ACL_FIRST_ENTRY],
LIBS=$ac_save_LIBS
fi
- if test "x$enable_acl$use_acl" = "xyes0"; then
+
+ if test "$enable_acl$use_acl" = yes0; then
AC_MSG_ERROR([ACLs enabled but support not detected])
- elif test "x$enable_acl$use_acl" = "xauto0"; then
+ elif test "$enable_acl$use_acl" = auto0; then
AC_MSG_WARN([libacl development library was not found or not usable.])
AC_MSG_WARN([AC_PACKAGE_NAME will be built without ACL support.])
fi
fi
+ test $gl_need_lib_has_acl && LIB_HAS_ACL=$LIB_ACL
AC_SUBST([LIB_ACL])
AC_DEFINE_UNQUOTED([USE_ACL], [$use_acl],
[Define to nonzero if you want access control list support.])
])
# gl_ACL_GET_FILE(IF-WORKS, IF-NOT)
-# -------------------------------------
+# ---------------------------------
# If 'acl_get_file' works (does not have a particular bug),
# run IF-WORKS, otherwise, IF-NOT.
-# This tests for a Darwin 8.7.0 bug, whereby acl_get_file returns NULL,
-# but sets errno = ENOENT for an existing file or directory.
+# When building natively, test for a Darwin 8.7.0 bug, whereby acl_get_file
+# returns NULL, but sets errno = ENOENT for an existing file or directory.
+# When cross-compiling, assume that this old bug no longer applies.
AC_DEFUN([gl_ACL_GET_FILE],
[
AC_CACHE_CHECK([for working acl_get_file], [gl_cv_func_working_acl_get_file],
- [AC_RUN_IFELSE(
+ [gl_cv_func_working_acl_get_file=no
+ AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/types.h>
#include <sys/acl.h>
#include <errno.h>
]],
- [[if (!acl_get_file (".", ACL_TYPE_ACCESS) && errno == ENOENT)
- return 1;
- return 0;
+ [[acl_t acl = acl_get_file (".", ACL_TYPE_ACCESS);
+ return acl ? acl_free (acl) != 0 : errno == ENOENT;
]])],
- [gl_cv_func_working_acl_get_file=yes],
- [gl_cv_func_working_acl_get_file=no],
- [gl_cv_func_working_acl_get_file=cross-compiling])])
+ [if test $cross_compiling = yes; then
+ gl_cv_func_working_acl_get_file="guessing yes"
+ elif ./conftest$ac_exeext; then
+ gl_cv_func_working_acl_get_file=yes
+ fi])])
+ AS_IF([test "$gl_cv_func_working_acl_get_file" != no], [$1], [$2])
+])
- AS_IF([test $gl_cv_func_working_acl_get_file = yes], [$1], [$2])
+# On GNU/Linux, testing if a file has an acl can be done with the getxattr
+# syscall which doesn't require linking against additional libraries.
+AC_DEFUN([gl_FILE_HAS_ACL],
+[
+ AC_REQUIRE([gl_FUNC_ACL_ARG])
+ if test "$enable_acl" != no; then
+ AC_CACHE_CHECK([for getxattr with XATTR_NAME_POSIX_ACL macros],
+ [gl_cv_getxattr_with_posix_acls],
+ [gl_cv_getxattr_with_posix_acls=no
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <sys/types.h>
+ #include <sys/xattr.h>
+ #include <linux/xattr.h>
+ ]],
+ [[ssize_t a = getxattr (".", XATTR_NAME_POSIX_ACL_ACCESS, 0, 0);
+ ssize_t b = getxattr (".", XATTR_NAME_POSIX_ACL_DEFAULT, 0, 0);
+ return a < 0 || b < 0;
+ ]])],
+ [gl_cv_getxattr_with_posix_acls=yes])])
+ fi
+ if test "$gl_cv_getxattr_with_posix_acls" = yes; then
+ LIB_HAS_ACL=
+ AC_DEFINE([GETXATTR_WITH_POSIX_ACLS], 1,
+ [Define to 1 if getxattr works with XATTR_NAME_POSIX_ACL_ACCESS
+ and XATTR_NAME_POSIX_ACL_DEFAULT.])
+ else
+ dnl Set gl_need_lib_has_acl to a nonempty value, so that any
+ dnl later gl_FUNC_ACL call will set LIB_HAS_ACL=$LIB_ACL.
+ gl_need_lib_has_acl=1
+ LIB_HAS_ACL=$LIB_ACL
+ fi
+ AC_SUBST([LIB_HAS_ACL])
])