1 files changed, 211 insertions, 0 deletions
diff --git a/m4/acl.m4 b/m4/acl.m4
new file mode 100644
index 0000000..8909442
--- /dev/null
+++ b/m4/acl.m4
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+# acl.m4 - check for access control list (ACL) primitives
+# serial 24
+
+# Copyright (C) 2002, 2004-2022 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_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 "$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 (GNU/Linux, FreeBSD, Mac OS X,
+      dnl IRIX, Tru64, Cygwin >= 2.5).
+      dnl -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
+             LIB_ACL=$ac_cv_search_acl_get_file
+           fi
+           AC_CHECK_FUNCS(
+             [acl_get_file acl_get_fd acl_set_file acl_set_fd \
+              acl_free acl_from_mode acl_from_text \
+              acl_delete_def_file acl_extended_file \
+              acl_delete_fd_np acl_delete_file_np \
+              acl_copy_ext_native acl_create_entry_np \
+              acl_to_short_text acl_free_text])
+           # 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 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],
+               [gl_cv_acl_ACL_FIRST_ENTRY],
+               [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[[#include <sys/types.h>
+#include <sys/acl.h>
+int type = ACL_FIRST_ENTRY;]])],
+                  [gl_cv_acl_ACL_FIRST_ENTRY=yes],
+                  [gl_cv_acl_ACL_FIRST_ENTRY=no])])
+             if test $gl_cv_acl_ACL_FIRST_ENTRY = yes; then
+               AC_DEFINE([HAVE_ACL_FIRST_ENTRY], [1],
+                 [Define to 1 if the constant ACL_FIRST_ENTRY exists.])
+             fi
+             dnl On Mac OS X, other types of ACLs are supported.
+             AC_CACHE_CHECK([for ACL_TYPE_EXTENDED],
+               [gl_cv_acl_ACL_TYPE_EXTENDED],
+               [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[[#include <sys/types.h>
+#include <sys/acl.h>
+int type = ACL_TYPE_EXTENDED;]])],
+                  [gl_cv_acl_ACL_TYPE_EXTENDED=yes],
+                  [gl_cv_acl_ACL_TYPE_EXTENDED=no])])
+             if test $gl_cv_acl_ACL_TYPE_EXTENDED = yes; then
+               AC_DEFINE([HAVE_ACL_TYPE_EXTENDED], [1],
+                 [Define to 1 if the ACL type ACL_TYPE_EXTENDED exists.])
+             fi
+           else
+             LIB_ACL=
+           fi
+          ])
+      fi
+
+      dnl Test for Solaris API (Solaris, Cygwin).
+      if test $use_acl = 0; then
+        AC_CHECK_FUNCS([facl])
+        if test $ac_cv_func_facl = yes; then
+          AC_SEARCH_LIBS([acl_trivial], [sec],
+            [if test "$ac_cv_search_acl_trivial" != "none required"; then
+               LIB_ACL=$ac_cv_search_acl_trivial
+             fi
+            ])
+          AC_CHECK_FUNCS([acl_trivial])
+          use_acl=1
+        fi
+      fi
+
+      dnl Test for HP-UX API.
+      if test $use_acl = 0; then
+        AC_CHECK_FUNCS([getacl])
+        if test $ac_cv_func_getacl = yes; then
+          use_acl=1
+        fi
+        dnl Test for HP-UX 11.11 API.
+        AC_CHECK_HEADERS([aclv.h], [], [], [#include <sys/types.h>])
+      fi
+
+      dnl Test for AIX API (AIX 5.3 or newer).
+      if test $use_acl = 0; then
+        AC_CHECK_FUNCS([aclx_get])
+        if test $ac_cv_func_aclx_get = yes; then
+          use_acl=1
+        fi
+      fi
+
+      dnl Test for older AIX API.
+      if test $use_acl = 0 || test "$ac_cv_func_aclx_get" = yes; then
+        AC_CHECK_FUNCS([statacl])
+        if test $ac_cv_func_statacl = yes; then
+          use_acl=1
+        fi
+      fi
+
+      dnl Test for NonStop Kernel API.
+      if test $use_acl = 0; then
+        AC_CHECK_FUNCS([aclsort])
+        if test $ac_cv_func_aclsort = yes; then
+          use_acl=1
+        fi
+      fi
+
+      LIBS=$ac_save_LIBS
+    fi
+
+    if test "$enable_acl$use_acl" = yes0; then
+      AC_MSG_ERROR([ACLs enabled but support not detected])
+    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 -n "$gl_need_lib_has_acl" && LIB_HAS_ACL=$LIB_ACL
+  AC_SUBST([LIB_ACL])
+  AC_DEFINE_UNQUOTED([USE_ACL], [$use_acl],
+    [Define to nonzero if you want access control list support.])
+  USE_ACL=$use_acl
+  AC_SUBST([USE_ACL])
+])
+
+# 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.
+# 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],
+    [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>
+          ]],
+          [[acl_t acl = acl_get_file (".", ACL_TYPE_ACCESS);
+            return acl ? acl_free (acl) != 0 : errno == ENOENT;
+          ]])],
+       [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], [$2])
+])
+
+# On GNU/Linux, testing if a file has an acl can be done with the getxattr
+# syscall which doesn't require linking against additional libraries.
+AC_DEFUN([gl_FILE_HAS_ACL],
+[
+  AC_REQUIRE([gl_FUNC_ACL_ARG])
+  if test "$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])
+])