LegacyBackend: init

nixops/plugin.py

@@ -1,8 +1,9 @@
 from typing import Dict, Type
 import nixops.plugins
 from nixops.storage import StorageBackend
+from nixops.storage.legacy import LegacyBackend
 
 
 @nixops.plugins.hookimpl
 def register_backends() -> Dict[str, Type[StorageBackend]]:
- return {}
+ return {"legacy": LegacyBackend}

nixops/script_defs.py

@@ -83,7 +83,6 @@ def network_state(args: Namespace) -> Generator[nixops.statefile.StateFile, None
  with TemporaryDirectory("nixops") as statedir:
  statefile = statedir + "/state.nixops"
  storage.fetchToFile(statefile)
-
  state = nixops.statefile.StateFile(statefile)
  try:
  storage.onOpen(state)

nixops/storage/legacy.py

@@ -0,0 +1,54 @@
+from nixops.storage import StorageArgDescriptions, StorageArgValues
+import nixops.statefile
+import sys
+import os
+import os.path
+
+class LegacyBackend:
+ @staticmethod
+ def arguments() -> StorageArgDescriptions:
+ raise NotImplementedError
+
+ def __init__(self, args: StorageArgValues) -> None:
+ pass
+
+ # fetchToFile: acquire a lock and download the state file to
+ # the local disk. Note: no arguments will be passed over kwargs.
+ # Making it part of the type definition allows adding new
+ # arguments later.
+ def fetchToFile(self, path: str, **kwargs) -> None:
+ os.symlink(os.path.abspath(self.state_location()), path)
+
+ def onOpen(self, sf: nixops.statefile.StateFile, **kwargs) -> None:
+ pass
+
+ def state_location(self) -> str:
+ env_override = os.environ.get("NIXOPS_STATE", os.environ.get("CHARON_STATE"))
+ if env_override is not None:
+ return env_override
+
+ home_dir = os.environ.get("HOME", "")
+ charon_dir = f"{home_dir}/.charon"
+ nixops_dir = f"{home_dir}/.nixops"
+
+ if not os.path.exists(nixops_dir):
+ if os.path.exists(charon_dir):
+ sys.stderr.write(
+ "renaming ‘{0}’ to ‘{1}’...\n".format(charon_dir, nixops_dir)
+ )
+ os.rename(charon_dir, nixops_dir)
+ if os.path.exists(nixops_dir + "/deployments.charon"):
+ os.rename(
+ nixops_dir + "/deployments.charon",
+ nixops_dir + "/deployments.nixops",
+ )
+ else:
+ os.makedirs(nixops_dir, 0o700)
+
+ return nixops_dir + "/deployments.nixops"
+
+ # uploadFromFile: upload the new state file and release any locks
+ # Note: no arguments will be passed over kwargs. Making it part of
+ # the type definition allows adding new arguments later.
+ def uploadFromFile(self, path: str, **kwargs) -> None:
+ pass