fixing DbusRemote

there was a typo where self.remote should have been self.host ... I also added an example (also reformat run.py)

examples/connect_to_remote_bus.py

@@ -0,0 +1,34 @@
+import os
+
+from pystemd.systemd1 import Unit
+from pystemd.dbuslib import DBusRemote
+
+
+def full_example():
+    # DBusRemote will use ssh to connect to another bus, so whatever a valid ssh conection
+    # string is, we can use it, you could also use DBusAddress, but thats harder
+    with DBusRemote(b"localhost") as bus, Unit(b"postfix.service", bus=bus) as sd_unit:
+        print("ConditionTimestamp", sd_unit.Unit.ConditionTimestamp)
+        print("StopWhenUnneeded", sd_unit.Unit.StopWhenUnneeded)
+        print("StartLimitAction", sd_unit.Unit.StartLimitAction)
+        print("StartLimitBurst", sd_unit.Unit.StartLimitBurst)
+        print("StartupBlockIOWeight", sd_unit.Service.StartupBlockIOWeight)
+        print("SyslogPriority", sd_unit.Service.SyslogPriority)
+        print("SyslogFacility", sd_unit.Service.SyslogFacility)
+        print("SyslogLevelPrefix", sd_unit.Service.SyslogLevelPrefix)
+        print("After", sd_unit.Unit.After)
+        print("Conditions", sd_unit.Unit.Conditions)
+        print("Job", sd_unit.Unit.Job)
+        print("InvocationID", sd_unit.Unit.InvocationID)
+        print("ExecStart", sd_unit.Service.ExecStart)
+
+        # next one require sudo powers!
+        if os.geteuid() == 0:
+            print(".GetProcesses", sd_unit.Service.GetProcesses())
+            print(".Start(b'replace')", sd_unit.Unit.Start(b"replace"))
+        else:
+            print("no root user, no complex method for you!")
+
+
+if __name__ == "__main__":
+    full_example()

pystemd/dbuslib.pyx

@@ -566,15 +566,24 @@ cdef class DBusMachine(DBus):
 
 
 cdef class DBusRemote(DBus):
-  "DBus class that connects to a remote host"
+  """
+  DBus class that connects to a remote host, this is using ssh, 
+  this uses [sd_bus_open_system_remote](https://manpages.debian.org/testing/libsystemd-dev/sd_bus_open_system_remote.3.en.html)
+  that will:
+
+    connects to the system bus on the specified host using ssh(1). host consists of an optional user name followed by the "@" symbol, 
+    and the hostname, optionally followed by a ":" and a port, optionally followed by a "/" and a machine name. If the machine name is 
+    given, a connection is created to the system bus in the specified container on the remote machine, and otherwise a connection to 
+    the system bus on the specified host is created.
+  """
 
   cdef char* host
 
   def __init__(self, char* host):
     self.host = host
 
   cdef int open_dbus_bus(self):
-    return dbusc.sd_bus_open_system_remote(&(self.bus), self.remote)
+    return dbusc.sd_bus_open_system_remote(&(self.bus), self.host)
 
 cdef class DBusAddress(DBus):
   "DBus class that connects to custom address"

pystemd/run.py

@@ -210,12 +210,12 @@ def bus_factory():
             unit_properties.update(
                 {
                     b"StandardInputFileDescriptor": get_fno(stdin) if stdin else stdin,
-                    b"StandardOutputFileDescriptor": get_fno(stdout)
-                    if stdout
-                    else stdout,
-                    b"StandardErrorFileDescriptor": get_fno(stderr)
-                    if stderr
-                    else stderr,
+                    b"StandardOutputFileDescriptor": (
+                        get_fno(stdout) if stdout else stdout
+                    ),
+                    b"StandardErrorFileDescriptor": (
+                        get_fno(stderr) if stderr else stderr
+                    ),
                 }
             )