From 2947852ee491953d81acb6d0822bc45da5a36c41 Mon Sep 17 00:00:00 2001
From: "Eric S. Raymond" <esr@thyrsus.com>
Date: Fri, 29 Apr 2005 18:12:48 +0000
Subject: Refactored, we're probably going to put most of this code in a
 library module soon.

---
 gpsd.hotplug | 82 +++++++++++++++++++++++++++++-------------------------------
 1 file changed, 40 insertions(+), 42 deletions(-)

(limited to 'gpsd.hotplug')

diff --git a/gpsd.hotplug b/gpsd.hotplug
index 27876875..7b0635cd 100755
--- a/gpsd.hotplug
+++ b/gpsd.hotplug
@@ -1,7 +1,8 @@
 #!/usr/bin/python
 # Hotplug script for gpsd by Eric S. Raymond, March 2005
 # This script is part of the gpsd distribution: see http://gpsd.berlios.de
-# Can be called like "gpsd.hotplug [+-]/dev/ttyUSB0" for test purposes.
+# Can be called like "gpsd.hotplug [add|remove] /dev/ttyUSB0" for test
+# purposes.
 import sys, os, syslog, glob, socket
 
 CONTROL_SOCKET = "/var/run/gpsd.sock"
@@ -23,56 +24,53 @@ def gpsd_control_connect():
     else:
         return sockfile
 
-def wake_up_gpsd(devpath, action):
-    subnodes = glob.glob("/sys" + devpath + "/*")
-    subnodes = map(os.path.basename, subnodes)
-    subnodes = filter(lambda s: s.startswith("ttyUSB"), subnodes) 
-    if len(subnodes) == 0:
-        syslog.syslog("no ttyUSB device under " + devpath)
-        return
-    elif len(subnodes) > 1:
-        syslog.syslog("too many ttyUSB devices under " + devpath)
-        return
-    else:
-        tty = "/dev/" + subnodes[0]
-        syslog.syslog(tty + " has gone active")
-
-        # Next get a connection to gpsd; start one if not already running
-        connect = gpsd_connect()
-        if connect:
-            syslog.syslog("reached a running gpsd")
-        elif action == 'add':
-            syslog.syslog("attempting to launch gpsd")
-            os.system("gpsd -F " + CONTROL_SOCKET)
-            connect = gpsd_control_connect()
-        if not connect:
-            return
-
-        # We've got a live connection to the gpsd control socket.  No
-        # need to parse response, because gpsd will lock on to the
-        # device if it's really a GPS and ignore it if it's not.
-        if action == 'add':
-            connect.write("+%s\r\n" % tty)
-        elif action == 'remove':
-            connect.write("-%s\r\n" % tty)
-        connect.close()
-        return
+def gpsd_control(action, argument):
+    "Pass a command to gpsd; start the daemon if not already running."
+    connect = gpsd_control_connect()
+    if connect:
+        syslog.syslog("reached a running gpsd")
+    elif action == 'add':
+        syslog.syslog("attempting to launch gpsd")
+        os.system("gpsd -F " + CONTROL_SOCKET)
+        connect = gpsd_control_connect()
+    if not connect:
+        return None
+    # We've got a live connection to the gpsd control socket.  No
+    # need to parse the response, because gpsd will lock on to the
+    # device if it's really a GPS and ignore it if it's not.
+    if action == 'add':
+        connect.write("+%s\r\n" % argument)
+    elif action == 'remove':
+        connect.write("-%s\r\n" % argument)
+    connect.close()
+    return action
 
 def hotplug(action, devpath):
-    syslog.openlog('gpsdplug', 0, syslog.LOG_DAEMON)
-    syslog.syslog("gpsdplug begins with action: %s" % action)
+    syslog.openlog('gpsd.hotplug', 0, syslog.LOG_DAEMON)
+    syslog.syslog("gpsd.hotplug begins with action: %s" % action)
     if not devpath:
         syslog.syslog("No device")
     else:
-        wake_up_gpsd(devpath, action)
+        subnodes = glob.glob("/sys" + devpath + "/*")
+        subnodes = map(os.path.basename, subnodes)
+        subnodes = filter(lambda s: s.startswith("ttyUSB"), subnodes) 
+        if len(subnodes) == 0:
+            syslog.syslog("no ttyUSB device under " + devpath)
+            return
+        elif len(subnodes) > 1:
+            syslog.syslog("too many ttyUSB devices under " + devpath)
+            return
+        else:
+            tty = "/dev/" + subnodes[0]
+            syslog.syslog(tty + " has gone active")
 
-    syslog.syslog("gpsdplug ends")
+            gpsd_control(action, tty)
+            return
+    syslog.syslog("gpsd.hotplug ends")
     syslog.closelog()
 
 if __name__ == '__main__':
     if len(sys.argv) == 1:	# Called as hotplug script
         hotplug(os.getenv("ACTION"), os.getenv("DEVPATH"))
     else:			# Called by hand for testing
-        fp = gpsd_control_connect()
-        fp.write(sys.argv[1]+"\n")
-        fp.close()
+        gpsd_control(sys.argv[1], sys.argv[2])
-- 
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