install_*: FileMode doesn't need to be None

There's no reason to allow None into the backend, it already has code to
check that all of the values of the FileMode object are None, so let's
use that, which is much simpler all the way down.

1 files changed, 6 insertions, 6 deletions

diff --git a/mesonbuild/build.py b/mesonbuild/build.py
index 83dd3f0..ee3b9c9 100644
--- a/mesonbuild/build.py
+++ b/mesonbuild/build.py
@@ -135,7 +135,7 @@ class DependencyOverride(HoldableObject):
 class Headers(HoldableObject):
 
     def __init__(self, sources: T.List[File], install_subdir: T.Optional[str],
-                 install_dir: T.Optional[str], install_mode: T.Optional['FileMode'],
+                 install_dir: T.Optional[str], install_mode: 'FileMode',
                  subproject: str):
         self.sources = sources
         self.install_subdir = install_subdir
@@ -158,14 +158,14 @@ class Headers(HoldableObject):
     def get_custom_install_dir(self) -> T.Optional[str]:
         return self.custom_install_dir
 
-    def get_custom_install_mode(self) -> T.Optional['FileMode']:
+    def get_custom_install_mode(self) -> 'FileMode':
         return self.custom_install_mode
 
 
 class Man(HoldableObject):
 
     def __init__(self, sources: T.List[File], install_dir: T.Optional[str],
-                 install_mode: T.Optional['FileMode'], subproject: str,
+                 install_mode: 'FileMode', subproject: str,
                  locale: T.Optional[str]):
         self.sources = sources
         self.custom_install_dir = install_dir
@@ -176,7 +176,7 @@ class Man(HoldableObject):
     def get_custom_install_dir(self) -> T.Optional[str]:
         return self.custom_install_dir
 
-    def get_custom_install_mode(self) -> T.Optional['FileMode']:
+    def get_custom_install_mode(self) -> 'FileMode':
         return self.custom_install_mode
 
     def get_sources(self) -> T.List['File']:
@@ -186,7 +186,7 @@ class Man(HoldableObject):
 class InstallDir(HoldableObject):
 
     def __init__(self, src_subdir: str, inst_subdir: str, install_dir: str,
-                 install_mode: T.Optional['FileMode'],
+                 install_mode: 'FileMode',
                  exclude: T.Tuple[T.Set[str], T.Set[str]],
                  strip_directory: bool, subproject: str,
                  from_source_dir: bool = True):
@@ -2611,7 +2611,7 @@ class ConfigurationData(HoldableObject):
 # during install.
 class Data(HoldableObject):
     def __init__(self, sources: T.List[File], install_dir: str,
-                 install_mode: T.Optional['FileMode'], subproject: str,
+                 install_mode: 'FileMode', subproject: str,
                  rename: T.List[str] = None):
         self.sources = sources
         self.install_dir = install_dir