diff options
Diffstat (limited to 'm4/acl.m4')
| -rw-r--r-- | m4/acl.m4 | 86 |
1 files changed, 66 insertions, 20 deletions
@@ -1,29 +1,36 @@ # acl.m4 - check for access control list (ACL) primitives -# serial 15 +# serial 22 -# Copyright (C) 2002, 2004-2012 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 @@ -39,7 +46,7 @@ AC_DEFUN([gl_FUNC_ACL], # If the acl_get_file bug is detected, don't enable the ACL support. gl_ACL_GET_FILE([use_acl=1], []) if test $use_acl = 1; then - dnl On Linux, additional API is declared in <acl/libacl.h>. + dnl On GNU/Linux, an additional API is declared in <acl/libacl.h>. AC_CHECK_HEADERS([acl/libacl.h]) AC_REPLACE_FUNCS([acl_entries]) AC_CACHE_CHECK([for ACL_FIRST_ENTRY], @@ -123,13 +130,15 @@ int type = ACL_TYPE_EXTENDED;]])], LIBS=$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.]) @@ -138,27 +147,64 @@ int type = ACL_TYPE_EXTENDED;]])], ]) # 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]) ]) |