Adapt the MS-Windows build to 'nofollow' changes

* nt/gnulib-cfg.mk (OMIT_GNULIB_MODULE_fchmodat)
(OMIT_GNULIB_MODULE_lchmod): Set to true to omit building these
modules on MS-Windows.
* nt/mingw-cfg.site (ac_cv_func_fchmodat)
(gl_cv_func_fchmodat_works, ac_cv_func_lchmod): Disable tests on
MS-Windows.

* src/w32.c (chmod_worker, lchmod, fchmodat): New functions.
(sys_chmod): Move most of the code to chmod_worker.
* src/w32.h (fchmodat, lchmod): Add prototypes.

1 files changed, 38 insertions, 3 deletions

diff --git a/src/w32.c b/src/w32.c
index a3b9a5683ad..cf1a3b37678 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -4320,10 +4320,9 @@ sys_chdir (const char * path)
     }
 }
 
-int
-sys_chmod (const char * path, int mode)
+static int
+chmod_worker (const char * path, int mode)
 {
-  path = chase_symlinks (map_w32_filename (path, NULL));
   if (w32_unicode_filenames)
     {
       wchar_t path_w[MAX_PATH];
@@ -4341,6 +4340,20 @@ sys_chmod (const char * path, int mode)
 }
 
 int
+sys_chmod (const char * path, int mode)
+{
+  path = chase_symlinks (map_w32_filename (path, NULL));
+  return chmod_worker (path, mode);
+}
+
+int
+lchmod (const char * path, mode_t mode)
+{
+  path = map_w32_filename (path, NULL);
+  return chmod_worker (path, mode);
+}
+
+int
 sys_creat (const char * path, int mode)
 {
   path = map_w32_filename (path, NULL);
@@ -4619,6 +4632,28 @@ fchmod (int fd, mode_t mode)
 }
 
 int
+fchmodat (int fd, char const *path, mode_t mode, int flags)
+{
+  /* Rely on a hack: an open directory is modeled as file descriptor 0,
+     as in fstatat.  FIXME: Add proper support for fchmodat.  */
+  char fullname[MAX_UTF8_PATH];
+
+  if (fd != AT_FDCWD)
+    {
+      if (_snprintf (fullname, sizeof fullname, "%s/%s", dir_pathname, path)
+          < 0)
+        {
+          errno = ENAMETOOLONG;
+          return -1;
+        }
+      path = fullname;
+    }
+
+  return
+    flags == AT_SYMLINK_NOFOLLOW ? lchmod (path, mode) : sys_chmod (path, mode);
+}
+
+int
 sys_rename_replace (const char *oldname, const char *newname, BOOL force)
 {
   BOOL result;