use stdin-closing for pidfile cleanup too

src/allmydata/scripts/tahoe_run.py

@@ -30,6 +30,7 @@ from allmydata.util.configutil import UnknownConfigError
 from allmydata.util.deferredutil import HookMixin
 from allmydata.util.pid import (
     check_pid_process,
+    cleanup_pidfile,
     ProcessInTheWay,
     InvalidPidFile,
 )

src/allmydata/test/cli/test_run.py

@@ -176,14 +176,8 @@ class RunTests(SyncTestCase):
         config['basedir'] = basedir.path
         config.twistd_args = []
 
-        class DummyRunner:
         runs = []
-            _exitSignal = None
-
-            def run(self):
-                self.runs.append(True)
-
-        result_code = run(config, runner=DummyRunner())
+        result_code = run(config, runApp=runs.append)
         self.assertThat(
             config.stderr.getvalue(),
             Contains("found invalid PID file in"),
@@ -191,7 +185,7 @@ class RunTests(SyncTestCase):
         # because the pidfile is invalid we shouldn't get to the
         # .run() call itself.
         self.assertThat(
-            DummyRunner.runs,
+            runs,
             Equals([])
         )
 

src/allmydata/util/pid.py

@@ -1,8 +1,5 @@
 import os
 import psutil
-from contextlib import (
-    contextmanager,
-)
 
 
 class ProcessInTheWay(Exception):
@@ -17,7 +14,12 @@ class InvalidPidFile(Exception):
     """
 
 
-@contextmanager
+class CannotRemovePidFile(Exception):
+    """
+    something went wrong removing the pidfile
+    """
+
+
 def check_pid_process(pidfile, find_process=None):
     """
     If another instance appears to be running already, raise an
@@ -72,12 +74,15 @@ def check_pid_process(pidfile, find_process=None):
     with pidfile.open("w") as f:
         f.write("{} {}\n".format(pid, starttime).encode("utf8"))
 
-    yield  # setup completed, await cleanup
 
+def cleanup_pidfile(pidfile):
+    """
+    Safely clean up a PID-file
+    """
     try:
         pidfile.remove()
     except Exception as e:
-        print(
+        raise CannotRemovePidFile(
             "Couldn't remove '{pidfile}': {err}.".format(
                 pidfile=pidfile.path,
                 err=e,