Regarding ENV variable

Regarding ENV variable

[Gnanasekar Loganathan]

Hi All,

i'm setting environment variable by set mycmd="knetbsd netbsd.g"

if call my own command, end up with no argument error.
grub> myboot $mycmd
myboot: usage knetbsd <filename>

if do echo $mycmd, getting the correct string
grub> echo $mycmd
knetbsd netbsd.g

if i directly run, throw unknown command
grub>$mycmd
error: unknown command `knetbsd netbsd.g'.

How do i pass 2 arguments from single env variable or how to run the
env as command?

Kindly advice or help me....

Thanks,
Gnana

Re: Regarding ENV variable

[Colin Watson]

On Mon, Jan 03, 2011 at 07:08:51PM +0530, Gnanasekar Loganathan wrote:
> i'm setting environment variable by set mycmd="knetbsd netbsd.g"
> 
> if call my own command, end up with no argument error.
> grub> myboot $mycmd
> myboot: usage knetbsd <filename>
> 
> if do echo $mycmd, getting the correct string
> grub> echo $mycmd
> knetbsd netbsd.g
> 
> if i directly run, throw unknown command
> grub>$mycmd
> error: unknown command `knetbsd netbsd.g'.
> 
> How do i pass 2 arguments from single env variable or how to run the
> env as command?

I don't think this is possible right now.  We would need to have some
equivalent of the shell 'eval' builtin.  The underlying pieces are
present (e.g. grub_script_execute_sourcecode) but aren't exposed in the
GRUB scripting interface.

If you aren't able to add this extension to GRUB script yourself and
propose a patch, I suggest reworking your code in some other form.

-- 
Colin Watson                                       [cjwatson@ubuntu.com]

Re: Regarding ENV variable

[BVK Chaitanya]

No, it is working as expected already; that is below code should
execute echo command and print "foo" already.

set cmd="echo foo"
$cmd


Gnanasekar, what is your grub version?  Please try with latest bzr version.



bvk.chaitanya



On Tue, Jan 4, 2011 at 4:16 PM, Colin Watson <cjwatson@ubuntu.com> wrote:
> On Mon, Jan 03, 2011 at 07:08:51PM +0530, Gnanasekar Loganathan wrote:
>> i'm setting environment variable by set mycmd="knetbsd netbsd.g"
>>
>> if call my own command, end up with no argument error.
>> grub> myboot $mycmd
>> myboot: usage knetbsd <filename>
>>
>> if do echo $mycmd, getting the correct string
>> grub> echo $mycmd
>> knetbsd netbsd.g
>>
>> if i directly run, throw unknown command
>> grub>$mycmd
>> error: unknown command `knetbsd netbsd.g'.
>>
>> How do i pass 2 arguments from single env variable or how to run the
>> env as command?
>
> I don't think this is possible right now.  We would need to have some
> equivalent of the shell 'eval' builtin.  The underlying pieces are
> present (e.g. grub_script_execute_sourcecode) but aren't exposed in the
> GRUB scripting interface.
>
> If you aren't able to add this extension to GRUB script yourself and
> propose a patch, I suggest reworking your code in some other form.
>
> --
> Colin Watson                                       [cjwatson@ubuntu.com]
>
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> http://lists.gnu.org/mailman/listinfo/grub-devel
>

Re: Regarding ENV variable

[Andreas Born]

I just quickly tested this behaviour with bash (and busybox). With neither of them I needed to use eval. Although eval could be a nice feature, it may be better to consider adapting to this seemingly common behaviour.

Here's the output from bash:
$ blub="blub1 blub2"
$ touch $blub
$ ls $blub
blub1  blub2
$ 

Regards,
Andreas

----- Ursprüngliche Mitteilung -----
> On Mon, Jan 03, 2011 at 07:08:51PM +0530, Gnanasekar Loganathan wrote:
> > i'm setting environment variable by set mycmd="knetbsd netbsd.g"
> > 
> > if call my own command, end up with no argument error.
> > grub> myboot $mycmd
> > myboot: usage knetbsd <filename>
> > 
> > if do echo $mycmd, getting the correct string
> > grub> echo $mycmd
> > knetbsd netbsd.g
> > 
> > if i directly run, throw unknown command
> > grub>$mycmd
> > error: unknown command `knetbsd netbsd.g'.
> > 
> > How do i pass 2 arguments from single env variable or how to run the
> > env as command?
> 
> I don't think this is possible right now.   We would need to have some
> equivalent of the shell 'eval' builtin.   The underlying pieces are
> present (e.g. grub_script_execute_sourcecode) but aren't exposed in the
> GRUB scripting interface.
> 
> If you aren't able to add this extension to GRUB script yourself and
> propose a patch, I suggest reworking your code in some other form.
> 
> -- 
> Colin Watson                                                                             [cjwatson@ubuntu.com]
> 
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> http://lists.gnu.org/mailman/listinfo/grub-devel

Re: Regarding ENV variable

[Colin Watson]

On Tue, Jan 04, 2011 at 01:36:02PM +0100, Andreas Born wrote:
> I just quickly tested this behaviour with bash (and busybox). With
> neither of them I needed to use eval. Although eval could be a nice
> feature, it may be better to consider adapting to this seemingly
> common behaviour.

Yes, as BVK pointed out I was mistaken.  Sorry.

-- 
Colin Watson                                       [cjwatson@ubuntu.com]

Re: Regarding ENV variable

[Gnanasekar Loganathan]

[-- Attachment #1: Type: text/plain, Size: 930 bytes --]

Please find the attachment.

grub version 1.98

I'm getting the same error 'unkown command'.

If you need any information please revert back to me.

I found alternate way of running those kind variables.

Thanks,
Gnana




On Tue, Jan 4, 2011 at 6:24 PM, Colin Watson <cjwatson@ubuntu.com> wrote:
> On Tue, Jan 04, 2011 at 01:36:02PM +0100, Andreas Born wrote:
>> I just quickly tested this behaviour with bash (and busybox). With
>> neither of them I needed to use eval. Although eval could be a nice
>> feature, it may be better to consider adapting to this seemingly
>> common behaviour.
>
> Yes, as BVK pointed out I was mistaken.  Sorry.
>
> --
> Colin Watson                                       [cjwatson@ubuntu.com]
>
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> http://lists.gnu.org/mailman/listinfo/grub-devel
>

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Re: Regarding ENV variable

[BVK Chaitanya]

On Wed, Jan 5, 2011 at 2:30 PM, Gnanasekar Loganathan
<l.gnanasekar@gmail.com> wrote:
> Please find the attachment.
>
> grub version 1.98
>

Please use bzr version, which is, 1.99~beta  Its been already fixed.



bvk.chaitanya

Re: Regarding ENV variable

[Gnanasekar Loganathan]

Thanks BVK!
 :)

-Gnana




On Wed, Jan 5, 2011 at 2:46 PM, BVK Chaitanya <bvk.groups@gmail.com> wrote:
> On Wed, Jan 5, 2011 at 2:30 PM, Gnanasekar Loganathan
> <l.gnanasekar@gmail.com> wrote:
>> Please find the attachment.
>>
>> grub version 1.98
>>
>
> Please use bzr version, which is, 1.99~beta  Its been already fixed.
>
>
>
> bvk.chaitanya
>
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> http://lists.gnu.org/mailman/listinfo/grub-devel
>