streamapi: use Popen as a context manager

1 files changed, 8 insertions, 7 deletions

diff --git a/mdbp/streamapi.py b/mdbp/streamapi.py
index a32761b..e959efc 100644
--- a/mdbp/streamapi.py
+++ b/mdbp/streamapi.py
@@ -57,13 +57,14 @@ def main() -> None:
                 seenjson = True
             if not seenjson:
                 raise ValueError("input is an empty tar archive")
-        proc = subprocess.Popen([*args.command, str(indir / "build.json")],
-                                stdout=sys.stderr
-                                       if build["output"].get("log", True)
-                                       else subprocess.DEVNULL,
-                                stderr=None if build["output"].get("log", True)
-                                       else subprocess.DEVNULL)
-        code = proc.wait()
+        with subprocess.Popen(
+            [*args.command, str(indir / "build.json")],
+            stdout=sys.stderr if build["output"].get("log", True)
+                              else subprocess.DEVNULL,
+            stderr=None if build["output"].get("log", True)
+                        else subprocess.DEVNULL
+        ) as proc:
+            code = proc.wait()
         if code != 0:
             sys.exit(code)
         with tarfile.open(fileobj=sys.stdout.buffer, mode="w|") as outtar: