simple power command

.gitmodules

+[submodule "eins"]
+	path = eins
+	url = git@ssh.git.revreso.de:eins/python-eins.git

eins @ 56e1b2b2

+Subproject commit 56e1b2b22e28a4630499644270c292047b62e7cf

power_command.ini

+[speakers]
+Description=Desktop speakers
+ExecStart=echo speaker turned on
+ExecStop=echo speaker turned off

power_command.py

+#!/usr/bin/env python3
+
+import configparser
+import sys
+import subprocess
+
+from eins import Eins
+
+actors = configparser.ConfigParser()
+actors.read("power_command.ini")
+#XXX: Complain on not present, make name configurable
+
+# Check if all the devices have the required settings
+error = False
+for actor in actors.sections():
+    for key in ["ExecStart", "ExecStop"]:
+        if key not in actors[actor]:
+            #XXX: Logging
+            print("Device {} is missing the required setting {}.".format(actor, key))
+            error = True
+if error:
+    sys.exit(-1)
+
+eins = Eins()
+
+@eins.simple_cmd()
+def power(target, state):
+    if target not in actors.sections():
+        print("Don't know the device {}.".format(target)) #XXX: Logging
+        return
+
+    if state == "on":
+        subprocess.run(actors[target]['ExecStart'], shell=True, check=True)
+        #TODO: catch errors, logging
+    elif state == "off":
+        subprocess.run(actors[target]['ExecStop'], shell=True, check=True)
+        #TODO: above
+    else:
+        print("Unknown power state {}, did you mean \"on\" or \"off\"?".format(target))
+        #XXX: Logging
+
+#TODO: Replace with standardized discovery
+@eins.simple_cmd()
+def commands():
+    print("Known devices:")
+    for key in actors.sections():
+        print(key)
+
+eins.run()