Move constants to top-level module

src/trick17/__init__.py

@@ -1,3 +1,10 @@
 # SPDX-FileCopyrightText: 2023-present Stefano Miccoli <[email protected]>
 #
 # SPDX-License-Identifier: MIT
+
+# systemd notable paths
+SD_BOOTED_PATH = "/run/systemd/system"
+SD_JOURNAL_SOCKET_PATH = "/run/systemd/journal/socket"
+
+# environmet variables possibly set by systemd
+SD_JOURNAL_STREAM_ENV = "JOURNAL_STREAM"

src/trick17/journal.py

@@ -13,16 +13,21 @@
 import sys
 import syslog
 
+import trick17
+
 
 def stderr_is_journal() -> bool:
  stat = os.fstat(sys.stderr.fileno())
- return os.environ.get("JOURNAL_STREAM", "") == f"{stat.st_dev}:{stat.st_ino}"
+ return (
+ os.environ.get(trick17.SD_JOURNAL_STREAM_ENV, "")
+ == f"{stat.st_dev}:{stat.st_ino}"
+ )
 
 
 class JournalHandler(logging.Handler):
  """Simple logger for the Systemd Native Journal Protocol"""
 
- SADDR: str = "/run/systemd/journal/socket"
+ SADDR: str = trick17.SD_JOURNAL_SOCKET_PATH
 
  @staticmethod
  def _serialize(key: bytes, val: bytes) -> bytes: