coverage and fixes for SSHProxy

- ipcluster engines forwards signals by default
- call `ipython profile create` remotely for remote_profile_dir to ensure subdirectories exist
- expose ipclsuter_args and default to `$python -m ipyparallel.cluster` for ipcluster_cmd in SSHProxy
- add SSHProxy to test_ssh

Author: minrk

ipyparallel/cluster/app.py

@@ -10,6 +10,7 @@
 import re
 import signal
 import sys
+from functools import partial
 
 import zmq
 from IPython.core.profiledir import ProfileDir
@@ -308,7 +309,28 @@ def init_cluster(self):
 
     def init_signal(self):
         # Setup signals
+        for signame in ("SIGUSR1", "SIGUSR2", "SIGINFO"):
+            try:
+                signum = getattr(signal, signame)
+            except AttributeError:
+                self.log.debug(f"Not forwarding {signame}")
+                pass
+            else:
+                self.log.debug(f"Forwarding {signame} to engines")
+                signal.signal(signum, self.relay_signal)
         signal.signal(signal.SIGINT, self.sigint_handler)
+        signal.signal(signal.SIGTERM, self.sigint_handler)
+
+    def relay_signal(self, signum, frame):
+        self.log.debug(f"Received signal {signum} received, relaying to engines...")
+        self.loop.add_callback_from_signal(partial(self.cluster.signal_engines, signum))
+
+    def sigint_handler(self, signum, frame):
+        return self.relay_signal(signum, frame)
+
+    def sigterm_handler(self, signum, frame):
+        self.log.debug(f"Received signal {signum} received, stopping launchers...")
+        self.loop.add_callback_from_signal(self.stop_cluster)
 
     def engines_started_ok(self):
         self.log.info("Engines appear to have started successfully")
@@ -374,10 +396,6 @@ async def stop_cluster(self, r=None):
             await self.cluster.stop_cluster()
             self.loop.add_callback(self.loop.stop)
 
-    def sigint_handler(self, signum, frame):
-        self.log.debug("SIGINT received, stopping launchers...")
-        self.loop.add_callback_from_signal(self.stop_cluster)
-
     def start_logging(self):
         # Remove old log files of the controller and engine
         if self.clean_logs:
@@ -463,6 +481,11 @@ def controller_stopped(self, stop_data):
             self.log.warning("Controller stopped. Shutting down.")
             self.loop.add_callback(self.stop_cluster)
 
+    def sigint_handler(self, signum, frame):
+        """Unlike engines, SIGINT shuts down `ipcluster start`"""
+        self.log.debug(f"Received signal {signum} received, stopping launchers...")
+        self.loop.add_callback_from_signal(self.stop_cluster)
+
     def start(self):
         """Start the app for the start subcommand."""
         # First see if the cluster is already running

ipyparallel/cluster/launcher.py

@@ -967,6 +967,26 @@ def start(self, hostname=None, user=None, port=None):
                 self.scp_args.append('-P')
                 self.scp_args.append(str(port))
 
+        # create remote profile dir
+        check_output(
+            self.ssh_cmd
+            + self.ssh_args
+            + [
+                self.location,
+                shlex_join(
+                    [
+                        self.remote_python,
+                        "-m",
+                        "IPython",
+                        "profile",
+                        "create",
+                        "--profile-dir",
+                        self.remote_profile_dir,
+                    ]
+                ),
+            ],
+            input=None,
+        )
         self.send_files()
         self.pid = sshx(
             self.ssh_cmd + self.ssh_args + [self.location],
@@ -1192,7 +1212,17 @@ class SSHProxyEngineSetLauncher(SSHLauncher):
     """
 
     n = Integer().tag(to_dict=True)
-    ipcluster_cmd = List(['ipcluster'], config=True)
+    ipcluster_cmd = List(Unicode(), config=True)
+
+    @default("ipcluster_cmd")
+    def _default_ipcluster_cmd(self):
+        return [self.remote_python, "-m", "ipyparallel.cluster"]
+
+    ipcluster_args = List(
+        Unicode(),
+        config=True,
+        help="""Extra CLI arguments to pass to ipcluster engines""",
+    )
 
     @property
     def program(self):
@@ -1207,7 +1237,7 @@ def program_args(self):
             self.remote_profile_dir,
             '--cluster-id',
             self.cluster_id,
-        ]
+        ] + self.ipcluster_args
 
     @default("to_send")
     def _to_send_default(self):

ipyparallel/tests/test_ssh.py

@@ -12,23 +12,29 @@
 # import tests that use engine_launcher_class fixture
 
 
-@pytest.fixture
-def ssh_config(ssh_key):
+@pytest.fixture(params=["SSH", "SSHProxy"])
+def ssh_config(ssh_key, request):
     c = Config()
     c.Cluster.controller_ip = '0.0.0.0'
-    c.Cluster.engine_launcher_class = 'SSH'
-    c.SSHEngineSetLauncher.scp_args = c.SSHLauncher.ssh_args = [
+    c.Cluster.engine_launcher_class = request.param
+    engine_set_cfg = c[f"{request.param}EngineSetLauncher"]
+    engine_set_cfg.ssh_args = [
         "-o",
         "UserKnownHostsFile=/dev/null",
         "-o",
         "StrictHostKeyChecking=no",
         "-i",
         ssh_key,
     ]
+    engine_set_cfg.scp_args = list(engine_set_cfg.ssh_args)  # copy
+    engine_set_cfg.remote_python = "/opt/conda/bin/python3"
+    engine_set_cfg.remote_profile_dir = "/home/ciuser/.ipython/profile_default"
+    engine_set_cfg.engine_args = ['--debug']
+    c.SSHProxyEngineSetLauncher.hostname = "127.0.0.1"
+    c.SSHProxyEngineSetLauncher.ssh_args.append("-p2222")
+    c.SSHProxyEngineSetLauncher.scp_args.append("-P2222")
+    c.SSHProxyEngineSetLauncher.user = "ciuser"
     c.SSHEngineSetLauncher.engines = {"ciuser@127.0.0.1:2222": 4}
-    c.SSHEngineSetLauncher.remote_python = "/opt/conda/bin/python3"
-    c.SSHEngineSetLauncher.remote_profile_dir = "/home/ciuser/.ipython/profile_default"
-    c.SSHEngineSetLauncher.engine_args = ['--debug']
     return c
 
 
@@ -41,4 +47,4 @@ def Cluster(ssh_config, BaseCluster):  # noqa: F811
 # override engine_launcher_class
 @pytest.fixture
 def engine_launcher_class(ssh_config):
-    return 'SSH'
+    return ssh_config.Cluster.engine_launcher_class