linux-kernel - Re: ktest help

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Date:   Thu, 6 Apr 2017 12:01:37 -0500
From:   Timur Tabi <timur@...eaurora.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     John 'Warthog9' Hawley <warthog9@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: ktest help

On 04/06/2017 11:49 AM, Steven Rostedt wrote:
>> > 
>> > This tftp's the kernel image (Image.q) and then boots.  I'm having
>> > difficulty figuring out how to implement that in ktest.
>> > 
> Can you make a script do this? If so, then you can simply tell ktest to
> call that script. See the options SWITCH_TO_TEST and SWITCH_TO_GOOD.

Not really.  Today, I literally copy/paste that command into my putty
session every time I boot.  I currently have a poor-mans-ktest that I use
today, that I'm hoping to replace with ktest itself.  It's a Python script
that uses pexpect to communicate with a serial-to-ethernet device.  It's
fragile and ugly, but it generally works:

def pxe_boot(child, kernel):
    global options
    global args

    print 'Looking for Grub prompt'

    count = 24  # two minutes, twice
    while True:
        child.sendline('c')
        try:
            child.expect('grub> ', timeout = 10)
            break
        except pexpect.TIMEOUT as e:
            count -= 1
            if count == 0:
                print 'Boot failed'
                return
            if count == 12:
                bmc_reboot(options.bmc)
                print 'Rebooting via BMC'
            else:
                print 'Still waiting ...'
            pass

    print 'Loading kernel %s' % sys.argv[1]
    if options.amberwing:
        child.sendline('linux %s earlycon=pl011,0xff78ed1000 console=ttyAMA1
rootwait rw ip=dhcp root=/dev/sda2 rootfstype=ext4 panic=1' % args[0])
    else:
        child.sendline('linux %s earlycon=pl011,mmio32,0x3ced1000
console=ttyAMA0 rootwait rw ip=dhcp root=/dev/sda2 rootfstype=ext4 panic=1'
% args[0])
    child.expect('grub> ', timeout = 60)
    print 'Booting Linux'
    child.sendline('boot')

Is there a way I can send a "boot" command after ktest connects to the console?

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