generate: log: Add a log prefix

Add a log prefix. This enables logging the config file that contained
the error or warning, which is helpful when regenerating all containers.

Signed-off-by: Enno Tensing <tenno@suij.in>

generate/log.py

@@ -15,6 +15,7 @@ class Log:
 
     messages: list = []
     logfile: Path
+    prefix: str = ""
 
     def __init__(self, path: str) -> None:
         """Init for Log."""
@@ -25,15 +26,19 @@ class Log:
     def log_error(self, msg: str) -> None:
         """Log an error."""
         now = self.timestamp()
-        prefix = "EE"
-        log_message = f"[{now}] ({prefix}) {msg}"
+        prefix = "(EE)"
+        if self.prefix != "":
+            prefix += f" {self.prefix}:"
+        log_message = f"[{now}] {prefix} {msg}"
         self.write_message(log_message)
 
     def log_warning(self, msg: str) -> None:
         """Log a warning."""
         now = self.timestamp()
-        prefix = "WW"
-        log_message = f"[{now}] ({prefix}) {msg}"
+        prefix = "(WW)"
+        if self.prefix != "":
+            prefix += f" {self.prefix}:"
+        log_message = f"[{now}] {prefix} {msg}"
         self.write_message(log_message)
 
     def write_message(self, msg: str) -> None:
@@ -49,3 +54,7 @@ class Log:
         return datetime.datetime.now(tz=datetime.UTC).strftime(
             "%Y-%m-%d %H:%M:%S",
         )
+
+    def set_prefix(self, prefix: str) -> None:
+        """Set a prefix."""
+        self.prefix = prefix