centralized ensure dir

build.cm

@@ -118,19 +118,7 @@ function get_build_dir() {
   return shop.get_build_dir()
 }
 
-function ensure_dir(path) {
-  if (fd.stat(path).isDirectory) return
-  var parts = array(path, '/')
-  var current = starts_with(path, '/') ? '/' : ''
-  var i = 0
-  for (i = 0; i < length(parts); i++) {
-    if (parts[i] == '') continue
-    current += parts[i] + '/'
-    if (!fd.stat(current).isDirectory) fd.mkdir(current)
-  }
-}
-
-Build.ensure_dir = ensure_dir
+Build.ensure_dir = fd.ensure_dir
 
 // ============================================================================
 // Dependency scanning helpers
@@ -267,7 +255,7 @@ Build.compile_file = function(pkg, file, target, opts) {
   var fail_path = cache_path(quick_content, SALT_FAIL)
 
   var build_dir = get_build_dir()
-  ensure_dir(build_dir)
+  fd.ensure_dir(build_dir)
 
   // Check for cached failure (skip files that previously failed to compile)
   if (fd.is_file(fail_path)) {
@@ -429,7 +417,7 @@ Build.build_module_dylib = function(pkg, file, target, opts) {
   all_objects = array(all_objects, _extra)
   var link_content = compute_link_content(all_objects, resolved_ldflags, target_ldflags, {target: _target, cc: cc})
   var build_dir = get_build_dir()
-  ensure_dir(build_dir)
+  fd.ensure_dir(build_dir)
   var dylib_path = cache_path(link_content, SALT_DYLIB)
   var cmd_parts = null
   var cmd_str = null
@@ -703,7 +691,7 @@ Build.compile_native = function(src_path, target, buildtype, pkg) {
   var src = text(fd.slurp(src_path))
   var native_key = native_cache_content(src, _target, san_flags)
   var build_dir = get_build_dir()
-  ensure_dir(build_dir)
+  fd.ensure_dir(build_dir)
 
   var dylib_path = cache_path(native_key, SALT_NATIVE)
   if (fd.is_file(dylib_path))
@@ -775,7 +763,7 @@ Build.compile_native_ir = function(optimized, src_path, opts) {
   var src = text(fd.slurp(src_path))
   var native_key = native_cache_content(src, _target, san_flags)
   var build_dir = get_build_dir()
-  ensure_dir(build_dir)
+  fd.ensure_dir(build_dir)
 
   var dylib_path = cache_path(native_key, SALT_NATIVE)
   if (fd.is_file(dylib_path))