Adding upstream version 2.9.4.upstream/2.9.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 216 insertions, 0 deletions

diff --git a/gl/m4/chown.m4 b/gl/m4/chown.m4
new file mode 100644
index 0000000..3638187
--- /dev/null
+++ b/gl/m4/chown.m4
@@ -0,0 +1,216 @@
+# serial 34
+# Determine whether we need the chown wrapper.
+
+dnl Copyright (C) 1997-2001, 2003-2005, 2007, 2009-2020 Free Software
+dnl Foundation, Inc.
+
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+# chown should accept arguments of -1 for uid and gid, and it should
+# dereference symlinks.  If it doesn't, arrange to use the replacement
+# function.
+
+# From Jim Meyering.
+
+# This is taken from the following Autoconf patch:
+# https://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=7fbb553727ed7e0e689a17594b58559ecf3ea6e9
+AC_DEFUN([AC_FUNC_CHOWN],
+[
+  AC_REQUIRE([AC_TYPE_UID_T])dnl
+  AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles
+  AC_CHECK_HEADERS([unistd.h])
+  AC_CACHE_CHECK([for working chown],
+    [ac_cv_func_chown_works],
+    [AC_RUN_IFELSE(
+       [AC_LANG_PROGRAM(
+          [AC_INCLUDES_DEFAULT
+           [#include <fcntl.h>
+          ]],
+          [[
+            char *f = "conftest.chown";
+            struct stat before, after;
+
+            if (creat (f, 0600) < 0)
+              return 1;
+            if (stat (f, &before) < 0)
+              return 1;
+            if (chown (f, (uid_t) -1, (gid_t) -1) == -1)
+              return 1;
+            if (stat (f, &after) < 0)
+              return 1;
+            return ! (before.st_uid == after.st_uid && before.st_gid == after.st_gid);
+          ]])
+       ],
+       [ac_cv_func_chown_works=yes],
+       [ac_cv_func_chown_works=no],
+       [case "$host_os" in # ((
+                           # Guess yes on Linux systems.
+          linux-* | linux) ac_cv_func_chown_works="guessing yes" ;;
+                           # Guess yes on glibc systems.
+          *-gnu* | gnu*)   ac_cv_func_chown_works="guessing yes" ;;
+                           # Guess no on native Windows.
+          mingw*)          ac_cv_func_chown_works="guessing no" ;;
+                           # If we don't know, obey --enable-cross-guesses.
+          *)               ac_cv_func_chown_works="$gl_cross_guess_normal" ;;
+        esac
+       ])
+     rm -f conftest.chown
+    ])
+  case "$ac_cv_func_chown_works" in
+    *yes)
+      AC_DEFINE([HAVE_CHOWN], [1],
+        [Define to 1 if your system has a working `chown' function.])
+      ;;
+  esac
+])# AC_FUNC_CHOWN
+
+AC_DEFUN_ONCE([gl_FUNC_CHOWN],
+[
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_REQUIRE([AC_TYPE_UID_T])
+  AC_REQUIRE([AC_FUNC_CHOWN])
+  AC_REQUIRE([gl_FUNC_CHOWN_FOLLOWS_SYMLINK])
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+  AC_CHECK_FUNCS_ONCE([chown fchown])
+
+  dnl mingw lacks chown altogether.
+  if test $ac_cv_func_chown = no; then
+    HAVE_CHOWN=0
+  else
+    dnl Some old systems treated chown like lchown.
+    case "$gl_cv_func_chown_follows_symlink" in
+      *yes) ;;
+      *) REPLACE_CHOWN=1 ;;
+    esac
+
+    dnl Some old systems tried to use uid/gid -1 literally.
+    case "$ac_cv_func_chown_works" in
+      *no)
+        AC_DEFINE([CHOWN_FAILS_TO_HONOR_ID_OF_NEGATIVE_ONE], [1],
+          [Define if chown is not POSIX compliant regarding IDs of -1.])
+        REPLACE_CHOWN=1
+        ;;
+    esac
+
+    dnl Solaris 9 ignores trailing slash.
+    dnl FreeBSD 7.2 mishandles trailing slash on symlinks.
+    dnl Likewise for AIX 7.1.
+    AC_CACHE_CHECK([whether chown honors trailing slash],
+      [gl_cv_func_chown_slash_works],
+      [touch conftest.file && rm -f conftest.link
+       AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+]], [[    if (symlink ("conftest.file", "conftest.link")) return 1;
+          if (chown ("conftest.link/", getuid (), getgid ()) == 0) return 2;
+        ]])],
+        [gl_cv_func_chown_slash_works=yes],
+        [gl_cv_func_chown_slash_works=no],
+        [case "$host_os" in
+                    # Guess yes on glibc systems.
+           *-gnu*)  gl_cv_func_chown_slash_works="guessing yes" ;;
+                    # Guess yes on musl systems.
+           *-musl*) gl_cv_func_chown_slash_works="guessing yes" ;;
+                    # If we don't know, obey --enable-cross-guesses.
+           *)       gl_cv_func_chown_slash_works="$gl_cross_guess_normal" ;;
+         esac
+        ])
+      rm -f conftest.link conftest.file])
+    case "$gl_cv_func_chown_slash_works" in
+      *yes) ;;
+      *)
+        AC_DEFINE([CHOWN_TRAILING_SLASH_BUG], [1],
+          [Define to 1 if chown mishandles trailing slash.])
+        REPLACE_CHOWN=1
+        ;;
+    esac
+
+    dnl OpenBSD fails to update ctime if ownership does not change.
+    AC_CACHE_CHECK([whether chown always updates ctime],
+      [gl_cv_func_chown_ctime_works],
+      [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+]], [[    struct stat st1, st2;
+          if (close (creat ("conftest.file", 0600))) return 1;
+          if (stat ("conftest.file", &st1)) return 2;
+          sleep (1);
+          if (chown ("conftest.file", st1.st_uid, st1.st_gid)) return 3;
+          if (stat ("conftest.file", &st2)) return 4;
+          if (st2.st_ctime <= st1.st_ctime) return 5;
+        ]])],
+        [gl_cv_func_chown_ctime_works=yes],
+        [gl_cv_func_chown_ctime_works=no],
+        [case "$host_os" in
+                    # Guess yes on glibc systems.
+           *-gnu*)  gl_cv_func_chown_ctime_works="guessing yes" ;;
+                    # Guess yes on musl systems.
+           *-musl*) gl_cv_func_chown_ctime_works="guessing yes" ;;
+                    # If we don't know, obey --enable-cross-guesses.
+           *)       gl_cv_func_chown_ctime_works="$gl_cross_guess_normal" ;;
+         esac
+        ])
+      rm -f conftest.file])
+    case "$gl_cv_func_chown_ctime_works" in
+      *yes) ;;
+      *)
+        AC_DEFINE([CHOWN_CHANGE_TIME_BUG], [1], [Define to 1 if chown fails
+          to change ctime when at least one argument was not -1.])
+        REPLACE_CHOWN=1
+        ;;
+    esac
+  fi
+])
+
+# Determine whether chown follows symlinks (it should).
+AC_DEFUN_ONCE([gl_FUNC_CHOWN_FOLLOWS_SYMLINK],
+[
+  AC_CACHE_CHECK(
+    [whether chown dereferences symlinks],
+    [gl_cv_func_chown_follows_symlink],
+    [
+      AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+
+        int
+        main ()
+        {
+          int result = 0;
+          char const *dangling_symlink = "conftest.dangle";
+
+          unlink (dangling_symlink);
+          if (symlink ("conftest.no-such", dangling_symlink))
+            abort ();
+
+          /* Exit successfully on a conforming system,
+             i.e., where chown must fail with ENOENT.  */
+          if (chown (dangling_symlink, getuid (), getgid ()) == 0)
+            result |= 1;
+          if (errno != ENOENT)
+            result |= 2;
+          return result;
+        }
+        ]])],
+        [gl_cv_func_chown_follows_symlink=yes],
+        [gl_cv_func_chown_follows_symlink=no],
+        [gl_cv_func_chown_follows_symlink="guessing yes"]
+      )
+    ]
+  )
+
+  case "$gl_cv_func_chown_follows_symlink" in
+    *yes) ;;
+    *)
+      AC_DEFINE([CHOWN_MODIFIES_SYMLINK], [1],
+        [Define if chown modifies symlinks.])
+      ;;
+  esac
+])