rdshell and rdbreak

rdshell and rdbreak

[Dave Young]

Hi,

For kernel developers sometimes boot-test need a minimal initrd, so just
drop into a shell is a nice feature.

The first impression of param 'rdshell' to me is it will drop me into a
shell, but It doesn't. It drop into shell only when initramfs fails.

The rdbreak is more near what I want, but it still fails when no root
args set in cmdline.

IMO initrd can provide such options at least: dropping into shell
without mount rootfs, user can mount by himself or do other things.

Thus, if it make sense how about add a:
rdbreak=force

OTOH, rdshell can be merged into rdbreak as:
rdbreak=fail

Any comments about this?
-- 
Thanks
Dave

Re: rdshell and rdbreak

[Harald Hoyer]

On 09/29/2011 08:43 AM, Dave Young wrote:
> Hi,
>
> For kernel developers sometimes boot-test need a minimal initrd, so just
> drop into a shell is a nice feature.
>
> The first impression of param 'rdshell' to me is it will drop me into a
> shell, but It doesn't. It drop into shell only when initramfs fails.
>
> The rdbreak is more near what I want, but it still fails when no root
> args set in cmdline.
>
> IMO initrd can provide such options at least: dropping into shell
> without mount rootfs, user can mount by himself or do other things.
>
> Thus, if it make sense how about add a:
> rdbreak=force
>
> OTOH, rdshell can be merged into rdbreak as:
> rdbreak=fail
>
> Any comments about this?

what about "rdshell rdbreak=cmdline" or
in new syntax "rd.shell=1 rd.break=cmdline" ??

Re: rdshell and rdbreak

[Dave Young]

On 09/29/2011 04:24 PM, Harald Hoyer wrote:

> On 09/29/2011 08:43 AM, Dave Young wrote:
>> Hi,
>>
>> For kernel developers sometimes boot-test need a minimal initrd, so just
>> drop into a shell is a nice feature.
>>
>> The first impression of param 'rdshell' to me is it will drop me into a
>> shell, but It doesn't. It drop into shell only when initramfs fails.
>>
>> The rdbreak is more near what I want, but it still fails when no root
>> args set in cmdline.
>>
>> IMO initrd can provide such options at least: dropping into shell
>> without mount rootfs, user can mount by himself or do other things.
>>
>> Thus, if it make sense how about add a:
>> rdbreak=force
>>
>> OTOH, rdshell can be merged into rdbreak as:
>> rdbreak=fail
>>
>> Any comments about this?
> 
> what about "rdshell rdbreak=cmdline" or
> in new syntax "rd.shell=1 rd.break=cmdline" ??


Thanks for comment, harald

I think it's still not so convenience to use two params for this issue,
and 'cmdline' also looks a little confuse for me. But it's up to you so
long as we can managed to have this feature.

-- 
Thanks
Dave

Re: rdshell and rdbreak

[Dave Young]

On 09/29/2011 05:20 PM, Dave Young wrote:

> On 09/29/2011 04:24 PM, Harald Hoyer wrote:
> 
>> On 09/29/2011 08:43 AM, Dave Young wrote:
>>> Hi,
>>>
>>> For kernel developers sometimes boot-test need a minimal initrd, so just
>>> drop into a shell is a nice feature.
>>>
>>> The first impression of param 'rdshell' to me is it will drop me into a
>>> shell, but It doesn't. It drop into shell only when initramfs fails.
>>>
>>> The rdbreak is more near what I want, but it still fails when no root
>>> args set in cmdline.
>>>
>>> IMO initrd can provide such options at least: dropping into shell
>>> without mount rootfs, user can mount by himself or do other things.
>>>
>>> Thus, if it make sense how about add a:
>>> rdbreak=force
>>>
>>> OTOH, rdshell can be merged into rdbreak as:
>>> rdbreak=fail
>>>
>>> Any comments about this?
>>
>> what about "rdshell rdbreak=cmdline" or
>> in new syntax "rd.shell=1 rd.break=cmdline" ??
> 
> 
> Thanks for comment, harald
> 
> I think it's still not so convenience to use two params for this issue,
> and 'cmdline' also looks a little confuse for me. But it's up to you so
> long as we can managed to have this feature.


Just tested, It works gracefully, thanks

see cmdline means break before cmdline, It is clear enough also

-- 
Thanks
Dave

Re: rdshell and rdbreak

[Dave Young]

On 09/29/2011 05:42 PM, Dave Young wrote:

> On 09/29/2011 05:20 PM, Dave Young wrote:
> 
>> On 09/29/2011 04:24 PM, Harald Hoyer wrote:
>>
>>> On 09/29/2011 08:43 AM, Dave Young wrote:
>>>> Hi,
>>>>
>>>> For kernel developers sometimes boot-test need a minimal initrd, so just
>>>> drop into a shell is a nice feature.
>>>>
>>>> The first impression of param 'rdshell' to me is it will drop me into a
>>>> shell, but It doesn't. It drop into shell only when initramfs fails.
>>>>
>>>> The rdbreak is more near what I want, but it still fails when no root
>>>> args set in cmdline.
>>>>
>>>> IMO initrd can provide such options at least: dropping into shell
>>>> without mount rootfs, user can mount by himself or do other things.
>>>>
>>>> Thus, if it make sense how about add a:
>>>> rdbreak=force
>>>>
>>>> OTOH, rdshell can be merged into rdbreak as:
>>>> rdbreak=fail
>>>>
>>>> Any comments about this?
>>>
>>> what about "rdshell rdbreak=cmdline" or
>>> in new syntax "rd.shell=1 rd.break=cmdline" ??
>>
>>
>> Thanks for comment, harald
>>
>> I think it's still not so convenience to use two params for this issue,
>> and 'cmdline' also looks a little confuse for me. But it's up to you so
>> long as we can managed to have this feature.
> 
> 
> Just tested, It works gracefully, thanks
> 
> see cmdline means break before cmdline, It is clear enough also
> 

BTW, The fedora wiki is outdated :)

-- 
Thanks
Dave