fix broken fs.copyfile function that crashed if you tried to use it

At least, if you tried to use it when passing an install_dir. Because
T.Sequence is horrible and we should never use it, and the annotations
are a lie that produces bugs.

So, fix the annotations on CustomTarget to never allow this to happen
again, and also fix the function too. Move some definitions elsewhere
inline to satisfy the linter.

Fixes #11157

mesonbuild/build.py

@@ -2416,7 +2416,7 @@ class CustomTarget(Target, CommandBase):
                  env: T.Optional[EnvironmentVariables] = None,
                  feed: bool = False,
                  install: bool = False,
-                 install_dir: T.Optional[T.Sequence[T.Union[str, Literal[False]]]] = None,
+                 install_dir: T.Optional[T.List[T.Union[str, Literal[False]]]] = None,
                  install_mode: T.Optional[FileMode] = None,
                  install_tag: T.Optional[T.List[T.Optional[str]]] = None,
                  absolute_paths: bool = False,

mesonbuild/modules/fs.py

@@ -302,7 +302,7 @@ class FSModule(ExtensionModule):
             [dest],
             build_by_default=True,
             install=kwargs['install'],
-            install_dir=kwargs['install_dir'],
+            install_dir=[kwargs['install_dir']],
             install_mode=kwargs['install_mode'],
             install_tag=[kwargs['install_tag']],
             backend=state.backend,

mesonbuild/modules/i18n.py

@@ -189,7 +189,6 @@ class I18nModule(ExtensionModule):
         if build_by_default is None:
             build_by_default = kwargs['install']
 
-        install_dir = [kwargs['install_dir']] if kwargs['install_dir'] is not None else None
         install_tag = [kwargs['install_tag']] if kwargs['install_tag'] is not None else None
 
         ct = build.CustomTarget(
@@ -202,7 +201,7 @@ class I18nModule(ExtensionModule):
             [kwargs['output']],
             build_by_default=build_by_default,
             install=kwargs['install'],
-            install_dir=install_dir,
+            install_dir=[kwargs['install_dir']] if kwargs['install_dir'] is not None else None,
             install_tag=install_tag,
         )
 
@@ -367,7 +366,6 @@ class I18nModule(ExtensionModule):
         if build_by_default is None:
             build_by_default = kwargs['install']
 
-        install_dir = [kwargs['install_dir']] if kwargs['install_dir'] is not None else None
         install_tag = [kwargs['install_tag']] if kwargs['install_tag'] is not None else None
 
         ct = build.CustomTarget(
@@ -381,7 +379,7 @@ class I18nModule(ExtensionModule):
             build_by_default=build_by_default,
             extra_depends=mo_targets,
             install=kwargs['install'],
-            install_dir=install_dir,
+            install_dir=[kwargs['install_dir']] if kwargs['install_dir'] is not None else None,
             install_tag=install_tag,
         )
 

test cases/common/14 configure file/meson.build

@@ -210,7 +210,11 @@ endif
 # Test the fs replacement
 # Test copying of an empty configuration data object
 inf = 'invalid-utf8.bin.in'
-outf = fs.copyfile(inf, 'invalid-utf8-1.bin')
+outf = fs.copyfile(inf, 'invalid-utf8-1.bin',
+  install: true,
+  install_dir: get_option('datadir') / meson.project_name(),
+  install_tag: 'copyfile',
+)
 test('fs.copyfile string', check_file, args: [files(inf), outf])
 
 # Test with default outname of string

test cases/common/14 configure file/test.json

@@ -3,6 +3,7 @@
     {"type": "file", "file": "usr/share/appdir/config2.h"},
     {"type": "file", "file": "usr/share/appdir/config2b.h"},
     {"type": "file", "file": "usr/share/appdireh/config2-1.h"},
-    {"type": "file", "file": "usr/share/appdirok/config2-2.h"}
+    {"type": "file", "file": "usr/share/appdirok/config2-2.h"},
+    {"type": "file", "file": "usr/share/configure file test/invalid-utf8-1.bin"}
   ]
 }