riotctrl_ctrl: provide helper class for native reset

dist/pythonlibs/riotctrl_ctrl/native.py

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+# Copyright (C) 2021 Freie Universität Berlin
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+import riotctrl.ctrl
+
+import psutil
+
+
+class NativeRIOTCtrl(riotctrl.ctrl.RIOTCtrl):
+    """RIOTCtrl abstraction for a native node
+
+    This works exactly as a normal RIOTCtrl, with the exception that
+    `DEBUG_ADAPTER_ID` is set in the environment to the PID of the `native`
+    process, whenever a terminal is started. This allows for `reset()` to also
+    work for a the `native` instance.
+    """
+    def _set_debug_adapter_id(self, child):
+        if child.name().endswith('.elf'):
+            self.env['DEBUG_ADAPTER_ID'] = str(child.pid)
+            return True
+        return False
+
+    def start_term(self, *args, **kwargs):
+        super().start_term(*args, **kwargs)
+        for child in psutil.Process(pid=self._term_pid()).children():
+            if self._set_debug_adapter_id(child):
+                break

dist/pythonlibs/riotctrl_ctrl/requirements.txt

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+psutil
+riotctrl