pdist: Add pdistd service for distmaster(s)

To implement out-update on boot, we need a way for a client to trigger a
pdist-update for itself on its distmaster.

Add a service for the distmaster(s), which allows a client to do that by
connecting to a fixed port on the distmaster (`telnet deinemuddah 237`).

install.sh

@@ -265,6 +265,8 @@ install_data misc_etc_files/request-key.d/id_resolver.conf \
                                                           "$DESTDIR$sysconfdir/request-key.d/id_resolver.conf"
 install_symlink /etc/local/access.conf                    "$DESTDIR$sysconfdir/security/access.conf"
 install_data misc_etc_files/cups/client.conf              "$DESTDIR$sysconfdir/cups/client.conf"
+install_data pdist/pdistd.socket                          "$DESTDIR$systemdunitdir/pdistd.socket"
+install_data pdist/pdistd@.service                        "$DESTDIR$systemdunitdir/pdistd@.service"
 
 postinstall
 exit

pdist/pdistd.socket

@@ -0,0 +1,15 @@
+[Install]
+
+WantedBy=multiuser.target
+
+[Unit]
+
+After=startup-tags.service network.target
+ConditionPathExists=/node/tags/distmaster
+
+[Socket]
+
+ListenStream=237
+ReusePort=yes
+Accept=yes
+

pdist/pdistd@.service

@@ -0,0 +1,8 @@
+[Unit]
+
+CollectMode=inactive-or-failed
+
+[Service]
+
+StandardOutput=socket
+ExecStart=bash -c "read ip host <<< $(getent hosts ${REMOTE_ADDR}) ; echo update in progess... ; pdist push $host --timeout 60 --set-pdist-status"