Allow setting empty environment variables

Trying to set an empty environment variable with `FOO=` would instead
pass the `FOO` variable from the host, which is the expected behavior
when `=` is missing.

diff --git a/mkosi/__init__.py b/mkosi/__init__.py
index 5a66cba1ee48371e0acaf9001f2e265611c6e24f..f6352455b17eddcb59b1153d73c3a636f7a81907 100644 (file)
--- a/mkosi/__init__.py
+++ b/mkosi/__init__.py
@@ -1210,8 +1210,8 @@ def load_args(args: argparse.Namespace) -> MkosiConfig:
     if args.environment:
         env = {}
         for s in args.environment:
-            key, _, value = s.partition("=")
-            value = value or os.getenv(key, "")
+            key, sep, value = s.partition("=")
+            value = value if sep else os.getenv(key, "")
             env[key] = value
         args.environment = env
     else: