fix: do not attempt setting exec permissions for folders on Windows

Not sure of what are the circumstances that make this cause problems on
Windows, but running this shouldn't be necessary on Windows, since the concept
of "execute permissions for directories means traversal permissions" is a
Unixism.

Fixes #991.

1 files changed, 5 insertions, 3 deletions

diff --git a/src/luarocks/fs/lua.lua b/src/luarocks/fs/lua.lua
index e9b4c5d8..ab32eff8 100644
--- a/src/luarocks/fs/lua.lua
+++ b/src/luarocks/fs/lua.lua
@@ -373,9 +373,11 @@ function fs_lua.make_dir(directory)
          if not ok then
             return false, err
          end
-         ok, err = fs.set_permissions(path, "exec", "all")
-         if not ok then
-            return false, err
+         if cfg.is_platform("unix") then
+            ok, err = fs.set_permissions(path, "exec", "all")
+            if not ok then
+               return false, err
+            end
          end
       elseif mode ~= "directory" then
          return false, path.." is not a directory"