Re: udev for dummies

From: Bob (recbo_at_nishanet.com)
Date: 12/12/03

  • Next message: Takayoshi Kochi: "[PATCH 2.4] duplicate PID fix"
    Date:	Thu, 11 Dec 2003 23:43:36 -0500
    To: linux-kernel <linux-kernel@vger.kernel.org>
    
    

    David T Hollis wrote:

    >On Thu, 2003-12-11 at 17:16, J.A. Magallon wrote:
    >
    >
    >>Hi all...
    >>
    >>I am starting to use 2.6, and I really would like to use udev.
    >>But I can't find a doc about how to move from taditional heavily
    >>populated /dev to new method.
    >>
    >>Any pointer ?
    >>
    Do you may mean heavily **over-populated**
    /dev? Learning more about devfs would make it
    easier to transition to udev. I'm going through this
    now for myself.

    You could learn how to strip out non-existent
    devices from /dev by using
     /etc/devfs/compat_symlinks
    by using regular expressions there to make symlinks
    for standard device names like udev uses but only
    permit devfsd to make device entries for devices
    you have on your system.

    Here is my /etc/devfs/compat_symlinks. At the
    top I don't use anything but devfs naming, then
    at the bottom I add a few symlinks both to limit
    naming to real devices(see md*) and to make
    conventional sd* hd* to make transition to
    udev simpler.

    -Bob

    # Enable full compatibility mode for old device names. You may comment these
    # out if you don't use the old device names. Make sure you know what you're
    # doing!
    #########REGISTER .* MKOLDCOMPAT
    UNREGISTER .* RMOLDCOMPAT

    # You may comment out the above and uncomment the following if you've
    # configured your system to use the original "new" devfs names or the really
    # new names
    #####REGISTER ^vc/.* MKOLDCOMPAT
    UNREGISTER ^vc/.* RMOLDCOMPAT
    #####REGISTER ^pty/m0 MKOLDCOMPAT
    ######REGISTER ^pty/s0 MKOLDCOMPAT
    UNREGISTER ^pty/.* RMOLDCOMPAT
    ######REGISTER ^misc MKOLDCOMPAT
    UNREGISTER ^misc RMOLDCOMPAT

    # You may comment these out if you don't use the original "new" names
    ######REGISTER .* MKNEWCOMPAT
    UNREGISTER .* RMNEWCOMPAT

    # Create compatibility links for broken USB serial driver
    REGISTER ^usb/tts/([0-9]+) CFUNCTION GLOBAL symlink $devname ttyUSB\1
    #######UNREGISTER ^usb/tts/([0-9]+) CFUNCTION GLOBAL unlink ttyUSB\1

    # Create compatibility link for broken misc/net/tun driver (must uncomment the
    # MKOLDCOMPAT for misc above if you want to use this)
    ######REGISTER ^misc/net/tun$ CFUNCTION GLOBAL unlink net/tun
    ######REGISTER ^misc/net/tun$ CFUNCTION GLOBAL symlink /dev/$devname net/tun

    # Bob removes non-existent /dev/md's, adds old conventional devices
    # to aid transition to udev as this percolates through /etc/init.d
    # scripts for fsck and mount--
    REGISTER ^md/[0-4] MKOLDCOMPAT
    UNREGISTER ^md/[5-9][0-9]* RMOLDCOMPAT
    REGISTER ^ide/host[0-2]/.* MKOLDCOMPAT
    REGISTER ^scsi/host[0-2]/bus0/target[0-3]/.* MKOLDCOMPAT
    REGISTER ^snd/.* MKOLDCOMPAT
    REGISTER ^sound/.* MKOLDCOMPAT
    REGISTER ^misc/rtc MKOLDCOMPAT

    -
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