pmb: Make RunOutputTypeDefault and RunOutputTypePopen enums

This allows us to get rid of some of the validation in sanity_checks()
as mypy handles this validation at "build time", and any typos in the
enum instantiation would be a runtime error rather than a silent
failure.

Additionally, it allows us to encode some of the behaviour of the
different output types into the type definition itself by using methods.

Part-of: https://gitlab.postmarketos.org/postmarketOS/pmbootstrap/-/merge_requests/2642

pmb/types.py

@@ -58,8 +58,55 @@ class CrossCompile(enum.Enum):
                 return Chroot.native()
 
 
-RunOutputTypeDefault = Literal["log", "stdout", "interactive", "tui", "null"]
-RunOutputTypePopen = Literal["background", "pipe"]
+class RunOutputTypeDefault(enum.Enum):
+    LOG = enum.auto()
+    STDOUT = enum.auto()
+    INTERACTIVE = enum.auto()
+    TUI = enum.auto()
+    NULL = enum.auto()
+
+    def is_to_stdout(self) -> bool:
+        match self:
+            case self.STDOUT | self.INTERACTIVE:
+                return True
+            case self.LOG | self.TUI | self.NULL:
+                return False
+            case _:
+                raise AssertionError
+
+    def has_timeout(self) -> bool:
+        match self:
+            case self.LOG | self.STDOUT:
+                return True
+            case self.INTERACTIVE | self.TUI | self.NULL:
+                return False
+            case _:
+                raise AssertionError
+
+    def has_pass_stdin(self) -> bool:
+        match self:
+            case self.INTERACTIVE | self.TUI:
+                return True
+            case self.LOG | self.STDOUT | self.NULL:
+                return False
+            case _:
+                raise AssertionError
+
+
+class RunOutputTypePopen(enum.Enum):
+    BACKGROUND = enum.auto()
+    PIPE = enum.auto()
+
+    def is_to_stdout(self) -> bool:
+        return False
+
+    def has_timeout(self) -> bool:
+        return False
+
+    def has_pass_stdin(self) -> bool:
+        return False
+
+
 RunOutputType = RunOutputTypeDefault | RunOutputTypePopen
 RunReturnType = str | int | subprocess.Popen
 PathString = Path | str