platform: rearrange imports

src/borg/platform.py

@@ -1,10 +1,24 @@
 import sys
 
-from .platform_base import acl_get, acl_set, SyncFile, sync_dir, set_flags, get_flags, swidth, API_VERSION
+"""
+Platform-specific APIs.
+
+Public APIs are documented in platform_base.
+"""
+
+from .platform_base import acl_get, acl_set
+from .platform_base import set_flags, get_flags
+from .platform_base import SyncFile, sync_dir, fdatasync
+from .platform_base import swidth, API_VERSION
 
 if sys.platform.startswith('linux'):  # pragma: linux only
-    from .platform_linux import acl_get, acl_set, SyncFile, set_flags, get_flags, swidth, API_VERSION
+    from .platform_linux import acl_get, acl_set
+    from .platform_linux import set_flags, get_flags
+    from .platform_linux import SyncFile
+    from .platform_linux import swidth, API_VERSION
 elif sys.platform.startswith('freebsd'):  # pragma: freebsd only
-    from .platform_freebsd import acl_get, acl_set, swidth, API_VERSION
+    from .platform_freebsd import acl_get, acl_set
+    from .platform_freebsd import swidth, API_VERSION
 elif sys.platform == 'darwin':  # pragma: darwin only
-    from .platform_darwin import acl_get, acl_set, swidth, API_VERSION
+    from .platform_darwin import acl_get, acl_set
+    from .platform_darwin import swidth, API_VERSION