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login without key in "root"

1330hayacool7102
Guru 10655 points


I use DVRRDK_02.80.00.10 and nfs_DM816x_EVM.tar.gz. And Every time I bootup, I need to key in "root" for username. Is there any way to skip this?

  • 0
    Guru 26430 points

    Try passing "-n" to getty in your /etc/inittab file, eg.

    1:2345:respawn:/sbin/getty -n 38400 tty1

    EDIT: Wrong line. Edit this one. Your tty name might be different.

    S:2345:respawn:/sbin/getty -n 115200 ttyO2

  • 0 in reply to Norman Wong
    Guru 10655 points

    Hereunder are my trial

    before trial:
      /etc/rc5.d/S99startapp: line 6: syntax error: "fi" unexpected
       _   _ ___  _   _         _
      | | | |    | ||| |___ ___| | _ ___
      | |_| | |) |  ~  | . |  _| |/_|  -|
      |_____|___ /____/ ___|_| |_| _|-__|

      DVR_Netra Board (2011.04)

      dvr login: root
      root@dvr:~#


    after trial:
      /etc/rc5.d/S99startapp: line 6: syntax error: "fi" unexpected

      login: root
      root@dvr:~#

    It seems unsuccessful for my request. Any further idea?

  • 0 in reply to 1330hayacool7102
    Guru 26430 points

    That S99startapp error doesn't look good. I assume that's not part of getty change. There are a few different versions of getty. Every version having different options. I was making a guess that you are using the tinylogin getty. Looks like "-n" means no banner. Try executing "/sbin/getty -h" to what options are offered. Do a "ls -l /sbin/getty" to see if there is a symbolic link to the real program, tinylogin, busybox, etc.

  • 0 in reply to Norman Wong
    Guru 10655 points

    That S99startapp error doesn't look good. I assume that's not part of getty change.
    ==> Yes. By my verification, they're independent.

    There are a few different versions of getty. Every version having different options.
    I was making a guess that you are using the tinylogin getty.
    ==> Yes. They use tinylogin with version 1.4. See message below
        root@dvr:~# getty
        Tinylogin v1.4 (2011.04.11-10:00+0000) multi-call binary
        Usage: getty getty [OPTIONS]... baud_rate,... line [termtype]

    Looks like "-n" means no banner. Try executing "/sbin/getty -h" to what options are offered.
    ==> see following for reference
        root@dvr:~# getty -h
        Tinylogin v1.4 (2011.04.11-10:00+0000) multi-call binary
        Usage: getty getty [OPTIONS]... baud_rate,... line [termtype]

    Do a "ls -l /sbin/getty" to see if there is a symbolic link to the real program, tinylogin, busybox, etc.
    ==> see following for reference
        root@dvr:~# ls -l /sbin/getty
        lrwxrwxrwx    1 1014     1016           16 Jun 29  2012 /sbin/getty -> ../bin/tinylogin

    I downloaded the source code(tinylogin-1.4.tar.bz2) and check that and found it seems different meanings from yours
    Maybe it's different version.

        case 'I': /* initstring */
            ...
        case 'L':   /* force local */
            ...
        case 'H':   /* fake login host */
            ...
        case 'f':   /* custom issue file */
            ...
        case 'h':   /* enable h/w flow control */
            ...
        case 'i':   /* do not show /etc/issue */
            ...
        case 'l': /* non-default login program */
            ...
        case 'm':   /* parse modem status message */
            ...
        case 'n':   /* no prompt */
            ...
        case 't':   /* time out */
            ...
        case 'w':   /* wait CRLF */

        Any further idea?

  • 0 in reply to 1330hayacool7102
    Guru 26430 points

    Some Google searches on "getty autologin".

    http://osdir.com/ml/linux.busybox/2004-05/msg00208.html
    http://wiki.gumstix.org/index.php?title=AutoLogin
    http://ciffer.net/~svend/blog/entry/Autologin_on_serial_consoles/

    Looks like a couple approaches used. One is specifying a non-deffault login program:

    S:2345:respawn:/sbin/getty 115200 ttyO2 -n -l /bin/sh
    S:2345:respawn:/sbin/getty 115200 ttyO2 -n -l /usr/local/bin/autologin

    where autologin is a compiled program or a wrapper shell script. If you ar elucky, you'll have an autologin already on your file system somewhere. The other approach is directly starting a shell on a terminal:

    tty02::respawn:-/bin/sh

    There might some problems with ctrl-C withi this approach. That's all I got.

  • 0 in reply to Norman Wong
    TI__Genius 11470 points

    Hello, M1234QWer

    I was able to skip the login prompt on my DM816x board. Here are the steps:

    1.Change the symbolic link to point to the busybox's getty:

              <board-shell># ln -s /bin/busybox /sbin/getty

    2.In board's /etc/inittab change the getty line to:

              S:2345:respawn:/sbin/getty 115200 ttyO2 -n -l /bin/autologin

    3. Create executable /bin/autologin script with the following content:

              #!/bin/sh
              exec /bin/login -f root

    When you reboot your board it should take effect. I am using EZSDK. Tell me if it is still not working.

    BR

  • 0 in reply to Vladimir-XID
    Guru 10655 points

    Hello Vladimir,
        After following steps, I can do that

         a. change the symbolic link to the busybox's getty:
                <board-shell># ln -s /bin/busybox /sbin/getty
         b. In board's /etc/inittab change the getty line to:
                S:2345:respawn:/sbin/getty 115200 ttyO2 -n -l /bin/autologin
         c. Create /bin/autologin script with the following content:
                #!/bin/sh
                exec /bin/login -f root
         d. <board-shell># chmod +x /bin/autologin
         e. <board-shell># reboot  

        Really appreciate for your help. Thanks

  • 0 in reply to 1330hayacool7102
    Intellectual 440 points

    Hi there,

    I tried this trick on DVRRDK, but it didn't work.  I definitely made sure I was using getty from busybox, not the original tinylogin.

    Anything I missed?

    Thanks,

    -Perry

  • 0 in reply to 1330hayacool7102
    Genius 4330 points

    Hi all

        I use DVRRDK_02.80.00.10, and do d - e, can log in.

  • 0 in reply to Eric Mao
    TI__Genius 11470 points

    Hello,

    @ -Perry

    How about your autologin script, are you sure it is executed? Did you add there some echo-s?

    BR

    Vladimir