[systemd-devel] controlling serial console using a token

[Praveen kumar R]

You mean in the *getty-generator.c ?*


On Mon, Apr 20, 2015 at 9:14 AM, Andrei Borzenkov <arvidjaar at gmail.com>
wrote:

> В Mon, 20 Apr 2015 09:09:09 +0530
> Praveen kumar R <praveenrgowda at gmail.com> пишет:
>
> > This is the snippet of the code in the systemV init system that controls
> > the serial console login
> > depending on the token
> >
> >  TOKENEXIST=`grep "TOKEN=" /proc/cmdline`
> >     TOKEN=0
> >     if [ "X$TOKENEXIST" != "X" ]; then
> >            #If token is pass as a command line arg, use it.
> >            TOKEN=`sed 's/.*TOKEN=//; s/ .*//' /proc/cmdline`
> >     fi
> >
> >     TOKENOVERRIDE=`grep "TOKENOVERRIDE=" /proc/cmdline`
> >     if [ "X$TOKENOVERRIDE" != "X" ]; then
> >            #If token is pass as a command line arg, use it.
> >            OVERRIDE=`sed 's/.*TOKENOVERRIDE=//; s/ .*//' /proc/cmdline`
> >            let "TOKEN = $TOKEN & $OVERRIDE"
> >     fi
> >
> >     echo "TOKEN = $TOKEN"
> >
> >     let "CONSOLE_LOGIN = $TOKEN & 512"
> >     if [ $CONSOLE_LOGIN -ne 0 ];  then
> >         echo "[`eval $uptime`]: Begin Console Access"
> >         /etc/console_login &
> >         echo "eCM console is enabled"
> >         export ENABLE_ECM_CONSOLE=y
> >     else
> >         echo "[`eval $uptime`]: Token doesn't allow console access"
> >         export ENABLE_ECM_CONSOLE=n
> >     fi
> >
> >
> >
> > I am trying to implement the same in the sytemd init system.
> >
>
> The straightforward approach is to put this code in generator that
> parses command line. It can mask standard console service and create
> unit for your console.
>
> >
> > On Sun, Apr 19, 2015 at 11:48 AM, Andrei Borzenkov <arvidjaar at gmail.com>
> > wrote:
> >
> > > В Sat, 18 Apr 2015 19:54:50 +0530
> > > Praveen kumar R <praveenrgowda at gmail.com> пишет:
> > >
> > > > Yes it's a kernel command line arg, it is board specific token
> introduced
> > > > to control the serial console.
> > > > if defined serial console should not be enabled.
> > > >
> > >
> > > Sorry I do not understand this sentence. "define" what? Please give
> > > exact example of kernel command line and explain what behavior you
> > > expect in this case.
> > >
> > > > we have this in place for other system initializing system - sytemV ,
> > > where
> > > > depending
> > > >
> > > > On Fri, Apr 17, 2015 at 4:24 PM, Lennart Poettering <
> > > lennart at poettering.net
> > > > <javascript:_e(%7B%7D,'cvml','lennart at poettering.net');>> wrote:
> > > >
> > > > > On Fri, 17.04.15 15:54, Praveen kumar R (praveenrgowda at gmail.com
> > > > > <javascript:_e(%7B%7D,'cvml','praveenrgowda at gmail.com');>) wrote:
> > > > >
> > > > > > I have a token passed on by command line argument on which I
> need to
> > > > > decide
> > > > > > to start the serial
> > > > >
> > > > > On which command line? Kernel command line? What kind of "token"?
> > > > >
> > > > > > console or not. I plan to tweak the getty*ttyS0.service and add
> the
> > > > > > script which validates the token and starts the console.
> > > > > >
> > > > > > Is this the right approach or is there any better way of
> handling it
> > > ??
> > > > >
> > > > > To get a login getty on the serial port its sufficient to add
> > > > > console=ttyS0... to the kernel cmdline. systemd automatically
> starts a
> > > > > serial getty automatically on the first terminal the kernel
> console is
> > > > > pointing to.
> > > > >
> > > > > Lennart
> > > > >
> > > > > --
> > > > > Lennart Poettering, Red Hat
> > > > >
> > >
> > >
>
>
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