77 lines
2.1 KiB
Python
Executable file
77 lines
2.1 KiB
Python
Executable file
#!/usr/bin/python
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import os
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from os.path import expanduser
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from pwd import getpwnam
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from grp import getgrnam
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import glob
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import syslog
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from string import split
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import usb.core
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####### Start User Edits #########
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# Controller USB parms
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control_vid = 0x0763
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control_pid = 0x0160
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# Mustang USB parms
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mustang_vid = 0x1ed8
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# Mustang III (original)
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# mustang_pid = 0x0005
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# Mustang III v2
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mustang_pid = 0x0016
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# Controller MIDI device
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midi_device = 1
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# MIDI listen channel
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midi_channel = 1
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######## End User Edits ##########
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rundir = "/var/run/mustang/"
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# Look for devices
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controller = usb.core.find( idVendor=control_vid, idProduct=control_pid )
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mustang = usb.core.find( idVendor=mustang_vid, idProduct=mustang_pid )
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pid = os.getpid()
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# syslog.syslog( "%d: Starting" % pid )
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# was it found?
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if controller and mustang:
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os.chdir( rundir )
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filelist = glob.glob( 'mustang_*' )
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if len( filelist ) == 1:
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lockfile = filelist[0]
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oldpid = split( lockfile, '_' )[1]
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# syslog.syslog( "%d: Check for path /proc/%s" % (pid, oldpid) )
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if not os.path.exists( "/proc/%s" % oldpid ):
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# No such process, ok to start ours
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# syslog.syslog( "%d: Renaming %s to mustang_%d" % (pid, lockfile, pid) )
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try:
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os.rename( lockfile, "mustang_%d" % os.getpid() )
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except Exception, e:
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pass
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# syslog.syslog( "%d: Unable to rename file" % pid )
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else:
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# syslog.syslog( "%d: About to exec" % pid )
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# Drop privileges and start the program
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pwObj = getpwnam('mustang-user')
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os.setgid( pwObj.pw_gid )
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# Need secondary groups to access MIDI and USB devices
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sec_gids = ( getgrnam('plugdev').gr_gid, getgrnam('audio').gr_gid )
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os.setgroups( sec_gids )
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os.setuid( pwObj.pw_uid )
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os.execl( "/usr/local/bin/mustang_midi", "mustang_midi", "%s" % midi_device, "%s" % midi_channel )
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else:
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syslog.syslog( "%d: /var/run/mustang is not properly setup" % pid )
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