[augeas-devel] Does augeas support grub2 config files

[Gaurav Dalvi]

Hey Raphael,

Thanks for reply. I am not trying to modify grub.cfg file manually or
through augeas. What grub2 says that in order to make changes in grub.cfg
file , you need to change some of the parameters in environment variable
file - /etc/default/grub or scripts under /etc/grub.d directory.

So what i did is :
1: Try to parse / change file /etc/default/grub using augeas .
2: Hoping augeas will make the change in /etc/default/grub file . (I have
verified this entire flow by making change manually in this file.)
3: execute this command to alter grub.cfg file :
/usr/sbin/grub2-mkconfig --output /boot/grub2/grub.cfg

This flow works if I do change /etc/default/grub file. But what I am trying
to do with augeas is not working.

*---------**---------**---------**---------**---------**---------*
*---------**---------**---------**---------**---------**---------*
*---------**---------**---------**---------**---------*
Sample /etc/default/grub file :

*root at ip-10-0-162-247 ec2-user]# cat /etc/default/grub *

*GRUB_TIMEOUT=1*

*GRUB_DEFAULT=saved*

*GRUB_DISABLE_SUBMENU=true*

*GRUB_TERMINAL_OUTPUT="console"*

*GRUB_CMDLINE_LINUX="crashkernel=auto console=ttyS0,115200n8 console=tty0"*

*GRUB_DISABLE_RECOVERY="true"*

now using augeas I tried to get the value of *GRUB_CMDLINE_LINUX** , *I got
the value "*crashkernel=auto console=ttyS0,115200n8 console=tty0"*
correctly. But when I do

set /files/etc/default/grub/*GRUB_CMDLINE_LINUX/rootdelay 300, *it does not
set under node *GRUB_CMDLINE_LINUX.*

*---------**---------**---------**---------**---------**---------*
*---------**---------**---------**---------**---------**---------*
*---------**---------**---------**---------**---------*

This is jut for /etc/default/grub file. I need to alter some other files
under /etc/grub.d. So thats why, my question was does augeas support
parsing these grub2 related files or not ?
BDW, I tried using Shellvars.lns as well. It didnt work.


[image: --]
Gaurav Dalvi
[image: http://]about.me/gaurav_dalvi
<http://about.me/gaurav_dalvi?promo=email_sig>


On Mon, Jun 15, 2015 at 11:05 PM, Raphaël Pinson <
raphael.pinson at camptocamp.com> wrote:

> Hi Gaurav,
>
>
> If I remember correctly, grub.cfg is not really a configuration
> file—contrarily to what its name might promise—but rather a shell script,
> with lots of commands and logic in there. You might try to parse it using
> Shellvars.lns, but there's no garantee that it will work at all.
>
>
> Cheers,
>
> Raphaël
>
>
>
>
> On Tue, Jun 16, 2015 at 1:47 AM, Gaurav Dalvi <gaurav1424 at gmail.com>
> wrote:
>
>> Hello,
>>
>> I have been truing to modify /boot/grub2/grub.cfg file using augeas. I
>> dont think it supports grub.cfg file.
>>
>> I was able to take take entire parameter from /etc/default/grub file and
>> then altering it, then executing grub2-mkconfig --ouput
>> /boot/grub2/grub.cfg , serves the purpose. But I need more granularity when
>> it comes parsing grub2 related files.
>>
>> Could you please tell me whether augeas support grub2 config files or not
>> and if yes, could you please point me to documentation ?
>>
>> Thanks a lot. I appreciate your help.
>> Awaiting your reply.
>>
>> [image: --]
>> Gaurav Dalvi
>> [image: http://]about.me/gaurav_dalvi
>> <http://about.me/gaurav_dalvi?promo=email_sig>
>>
>>
>> _______________________________________________
>> augeas-devel mailing list
>> augeas-devel at redhat.com
>> https://www.redhat.com/mailman/listinfo/augeas-devel
>>
>
>
>
> --
> Raphaël Pinson
> Infrastructure Developer & Training Leader
> +33 458 482 013
>
> Camptocamp France
> Savoie Technolac
> BP 352
> 48, avenue du Lac du Bourget
> 73372 Le Bourget du Lac, Cedex
> www.camptocamp.com
>
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