Add init framework and automatic start-stop

50-mustang.rules

@@ -1,11 +1,7 @@
-SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0004", GROUP="plugdev"
+# Mustang III (original)
-SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0005", GROUP="plugdev"
+ACTION=="add|change", SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0005", GROUP="plugdev", RUN+="/bin/bash -c '/bin/echo /usr/local/bin/mustang_bridge_start | /usr/bin/at now'"
-SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0006", GROUP="plugdev"
+ACTION=="remove", ENV{ID_VENDOR_ID}=="1ed8", ENV{ID_MODEL_ID}=="0005", ENV{DEVTYPE}=="usb_device", RUN+="/usr/local/bin/mustang_bridge_stop"
-SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0007", GROUP="plugdev"
+
-SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0010", GROUP="plugdev"
+# Mustang III v2
-SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0011", GROUP="plugdev"
+ACTION=="add|change", SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0016", GROUP="plugdev", RUN+="/bin/bash -c '/bin/echo /usr/local/bin/mustang_bridge_start | /usr/bin/at now'"
-SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0012", GROUP="plugdev"
+ACTION=="remove", ENV{ID_VENDOR_ID}=="1ed8", ENV{ID_MODEL_ID}=="0016", ENV{DEVTYPE}=="usb_device", RUN+="/usr/local/bin/mustang_bridge_stop"
-SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0013", GROUP="plugdev"
-SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0014", GROUP="plugdev"
-SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0015", GROUP="plugdev"
-SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0016", GROUP="plugdev"

60-midi.rules

@@ -0,0 +1,2 @@
+ACTION=="add|change", SUBSYSTEM=="usb", ATTRS{idVendor}=="0763", ATTRS{idProduct}=="0160", RUN+="/bin/bash -c '/bin/echo /usr/local/bin/mustang_bridge_start | /usr/bin/at now'"
+ACTION=="remove", ENV{ID_VENDOR_ID}=="0763", ENV{ID_MODEL_ID}=="0160", ENV{DEVTYPE}=="usb_device", RUN+="/usr/local/bin/mustang_bridge_stop"

install.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+BINDIR=/usr/local/bin
+INITDIR=/etc/init.d
+UDEVDIR=/etc/udev/rules.d
+
+if [ ! -f "mustang_midi" ]; then
+    echo "Must build mustang_midi first!"
+    exit 1
+fi
+
+echo "Create non-privileged user for MIDI bridge"
+
+useradd -M -s /bin/false mustang-user
+
+echo "Copy program and support scripts to $BINDIR"
+
+cp -f mustang_bridge_start $BINDIR
+chmod 0755 $BINDIR/mustang_bridge_start
+chown root:root $BINDIR/mustang_bridge_start
+
+cp -f mustang_bridge_stop $BINDIR
+chmod 0755 $BINDIR/mustang_bridge_stop
+chown root:root $BINDIR/mustang_bridge_stop
+
+cp -f mustang_midi $BINDIR
+chmod 0755 $BINDIR/mustang_midi
+chown root:root $BINDIR/mustang_midi
+
+echo "Copy init script to $INITDIR and register"
+
+cp -f mustang_bridge $INITDIR
+chmod 0755 $INITDIR/mustang_bridge
+chown root:root $INITDIR/mustang_bridge
+
+update-rc.d mustang_bridge defaults
+
+echo "Copy udev rules to $UDEVDIR and refresh system"
+
+cp -f 50-mustang.rules $UDEVDIR
+chmod 0644 $UDEVDIR/50-mustang.rules
+chown root:root $UDEVDIR/50-mustang.rules
+
+cp -f 60-midi.rules $UDEVDIR
+chmod 0644 $UDEVDIR/60-midi.rules
+chown root:root $UDEVDIR/60-midi.rules
+
+udevadm control --reload
+
+echo "Done!"

mustang_bridge

@@ -0,0 +1,40 @@
+#! /bin/sh
+### BEGIN INIT INFO
+# Provides:          mustang_bridge
+# Required-Start:    mountkernfs
+# Required-Stop:
+# Default-Start:     S
+# Default-Stop:
+# Short-Description: Setup /var/run/mustang directory
+### END INIT INFO
+
+
+PATH=/sbin:/usr/sbin:/bin:/usr/bin
+
+. /lib/init/vars.sh
+. /lib/lsb/init-functions
+
+do_start() {
+    [ -d /var/run/mustang ] || mkdir /var/run/mustang
+    if [ -z "$(ls -A -- "/var/run/mustang")" ]; then
+        touch /var/run/mustang/mustang_0000
+    fi
+}
+
+case "$1" in
+    start)
+	do_start
+        ;;
+    restart|reload|force-reload)
+        echo "Error: argument '$1' not supported" >&2
+        exit 3
+        ;;
+    stop|status)
+        # No-op
+        exit 0
+        ;;
+    *)
+        echo "Usage: $0 start|stop" >&2
+        exit 3
+        ;;
+esac

mustang_bridge_start

@@ -0,0 +1,72 @@
+#!/usr/bin/python
+
+import os
+from os.path import expanduser
+from pwd import getpwnam
+from grp import getgrnam
+
+import glob
+import syslog
+from string import split
+
+import usb.core
+
+####### Start User Edits #########
+
+# Controller USB parms
+control_vid = 0x0763
+control_pid = 0x0160
+
+# Mustang USB parms
+mustang_vid = 0x1ed8
+mustang_pid = 0x0016
+
+# Controller MIDI device
+midi_device = 2
+
+# MIDI listen channel
+midi_channel = 1
+
+######## End User Edits ##########
+
+rundir = "/var/run/mustang/"
+
+# Look for devices
+controller = usb.core.find( idVendor=control_vid, idProduct=control_pid )
+mustang = usb.core.find( idVendor=mustang_vid, idProduct=mustang_pid )
+
+pid = os.getpid()
+# syslog.syslog( "%d: Starting" % pid )
+
+# was it found?
+if controller and mustang:
+    os.chdir( rundir )
+    filelist = glob.glob( 'mustang_*' )
+
+    if len( filelist ) == 1:
+        lockfile = filelist[0]
+        oldpid = split( lockfile, '_' )[1]
+
+        # syslog.syslog( "%d: Check for path /proc/%s" % (pid, oldpid) )
+        if not os.path.exists( "/proc/%s" % oldpid ):
+            # No such process, ok to start ours
+            # syslog.syslog( "%d: Renaming %s to mustang_%d" % (pid, lockfile, pid) )
+            try:
+                os.rename( lockfile, "mustang_%d" % os.getpid() ) 
+            except Exception, e:
+                pass
+                # syslog.syslog( "%d: Unable to rename file" % pid )
+            else:
+                # syslog.syslog( "%d: About to exec" % pid )
+                # Drop privileges and start the program
+                pwObj = getpwnam('mustang-user')
+                os.setgid( pwObj.pw_gid )
+                
+                # Need secondary groups to access MIDI and USB devices
+                sec_gids = ( getgrnam('plugdev').gr_gid, getgrnam('audio').gr_gid )
+                os.setgroups( sec_gids )
+                
+                os.setuid( pwObj.pw_uid )
+                os.execl( "/usr/local/bin/mustang_midi", "mustang_midi", "%s" % midi_device, "%s" % midi_channel )
+    else:
+        syslog.syslog( "%d: /var/run/mustang is not properly setup" % pid )

mustang_bridge_stop

@@ -0,0 +1,35 @@
+#!/usr/bin/python
+
+import os
+from glob import glob
+from syslog import syslog
+from string import split
+import signal
+
+pid = os.getpid()
+# syslog( "%d: Starting" % pid )
+
+rundir = "/var/run/mustang/"
+
+# Check for pid file
+os.chdir( rundir )
+filelist = glob( 'mustang_*' )
+
+if len( filelist ) == 1:
+    lockfile = filelist[0]
+    oldpid = split( lockfile, '_' )[1]
+
+    # See if the process still exists
+    # syslog( "%d: Check for path /proc/%s" % (pid, oldpid) )
+    if os.path.exists( "/proc/%s" % oldpid ):
+        # syslog( "%d: Sending sigint to pid %s" % (pid, oldpid) )
+        try:
+            os.kill( int(oldpid), signal.SIGINT ) 
+        except Exception, e:
+            syslog( "%d: Signal failed: %s" % (pid, e) )
+            pass
+        else:
+            # syslog( "%d: Signal sent" % pid )
+            pass
+else:
+    syslog( "%d: /var/run/mustang is not properly setup" % pid )

mustang_midi.cpp

@@ -172,9 +172,8 @@ int main( int argc, const char **argv ) {
   // Don't want sysex, timing, active sense
   input_handler->ignoreTypes( true, true, true );
 
-  std::cout << "\nTranslating MIDI input - press <enter> to quit.\n";
+  // Block and wait for signal 
-  char input;
+  pause();
-  std::cin.get(input);
 
   delete input_handler;
   return 0;