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Subject: Re: Mounting a virtual hard-disk and booting from it
From: Swapnesh Chaubal <schauba@clemson.edu>
To: The development of GNU GRUB <grub-devel@gnu.org>
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Hey All,

For some reason I'm not getting mails in grub-devel@gnu.org. Could someone
kindly forward the replies to this id too?

Thanks,
Swapnesh

On Tue, Jun 21, 2011 at 3:02 PM, Swapnesh Chaubal <schauba@clemson.edu>wrote:

> Hey folks,
>
> I use a script from VMWare to read a virtual hard-disk and then mount it to
> a drive in Linux. How can I boot from this mounted drive using grub (I need
> to mount the drive before booting to any OS). I could have all the mounting
> stuff written in a python/bash script. However, is there a way to run that
> script from GRUB or a GRUB module?
>
> Thanks,
> Swapnesh
>

--90e6ba6e87e6ab2ff304a64d53d2
Content-Type: text/html; charset=ISO-8859-1
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Hey All,<br><br>For some reason I&#39;m not getting mails in <a href=3D"mai=
lto:grub-devel@gnu.org">grub-devel@gnu.org</a>. Could someone kindly forwar=
d the replies to this id too?<br><br>Thanks,<br>Swapnesh<br><br><div class=
=3D"gmail_quote">
On Tue, Jun 21, 2011 at 3:02 PM, Swapnesh Chaubal <span dir=3D"ltr">&lt;<a =
href=3D"mailto:schauba@clemson.edu">schauba@clemson.edu</a>&gt;</span> wrot=
e:<br><blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex;=
 border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hey folks,<br><br>I use a script from VMWare to read a virtual hard-disk an=
d then mount it to a drive in Linux. How can I boot from this mounted drive=
 using grub (I need to mount the drive before booting to any OS). I could h=
ave all the mounting stuff written in a python/bash script. However, is the=
re a way to run that script from GRUB or a GRUB module?<br>

<br>Thanks,<br><font color=3D"#888888">Swapnesh <br>
</font></blockquote></div><br>

--90e6ba6e87e6ab2ff304a64d53d2--


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Date: Wed, 22 Jun 2011 20:00:29 +0200
From: Martin Rosenau <martin@rosenau-ka.de>
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Subject: Re: Mounting a virtual hard-disk and booting from it
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This is a multi-part message in MIME format.
--------------090006000501090809010707
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Hello

I do not think you can run Python scripts from GRUB. A Python
interpreter is a very large program requiring a complete operating
system. It would be very complex to run such scripts from GRUB...

Martin

> On Tue, Jun 21, 2011 at 3:02 PM, Swapnesh Chaubal <schauba@clemson.edu
> <mailto:schauba@clemson.edu>> wrote:
>
>     Hey folks,
>
>     I use a script from VMWare to read a virtual hard-disk and then
>     mount it to a drive in Linux. How can I boot from this mounted
>     drive using grub (I need to mount the drive before booting to any
>     OS). I could have all the mounting stuff written in a python/bash
>     script. However, is there a way to run that script from GRUB or a
>     GRUB module?
>
>     Thanks,
>     Swapnesh
>
>
>
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/grub-devel


--------------090006000501090809010707
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
    <title></title>
  </head>
  <body text="#000000" bgcolor="#ffffff">
    Hello<br>
    <br>
    I do not think you can run Python scripts from GRUB. A Python
    interpreter is a very large program requiring a complete operating
    system. It would be very complex to run such scripts from GRUB...<br>
    <br>
    Martin<br>
    <br>
    <blockquote
      cite="mid:BANLkTinObT2f57TSWxZbgocsHA017zEq4w@mail.gmail.com"
      type="cite">
      <div class="gmail_quote">
        On Tue, Jun 21, 2011 at 3:02 PM, Swapnesh Chaubal <span
          dir="ltr">&lt;<a moz-do-not-send="true"
            href="mailto:schauba@clemson.edu">schauba@clemson.edu</a>&gt;</span>
        wrote:<br>
        <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
          0.8ex; border-left: 1px solid rgb(204, 204, 204);
          padding-left: 1ex;">
          Hey folks,<br>
          <br>
          I use a script from VMWare to read a virtual hard-disk and
          then mount it to a drive in Linux. How can I boot from this
          mounted drive using grub (I need to mount the drive before
          booting to any OS). I could have all the mounting stuff
          written in a python/bash script. However, is there a way to
          run that script from GRUB or a GRUB module?<br>
          <br>
          Thanks,<br>
          <font color="#888888">Swapnesh <br>
          </font></blockquote>
      </div>
      <br>
      <pre wrap="">
<fieldset class="mimeAttachmentHeader"></fieldset>
_______________________________________________
Grub-devel mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Grub-devel@gnu.org">Grub-devel@gnu.org</a>
<a class="moz-txt-link-freetext" href="https://lists.gnu.org/mailman/listinfo/grub-devel">https://lists.gnu.org/mailman/listinfo/grub-devel</a>
</pre>
    </blockquote>
    <br>
  </body>
</html>

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Thanks for the reply Martin, is there any other way to achieve this? I do
not need to python script for it, I need to run an executable which reads
the virtual hard-disk. So I think I'll need to run this executable and add
an entry in grub.conf before the boot menu shows up.



On Wed, Jun 22, 2011 at 2:00 PM, Martin Rosenau <martin@rosenau-ka.de>wrote:

> **
> Hello
>
> I do not think you can run Python scripts from GRUB. A Python interpreter
> is a very large program requiring a complete operating system. It would be
> very complex to run such scripts from GRUB...
>
> Martin
>
>  On Tue, Jun 21, 2011 at 3:02 PM, Swapnesh Chaubal <schauba@clemson.edu>wrote:
>
>> Hey folks,
>>
>> I use a script from VMWare to read a virtual hard-disk and then mount it
>> to a drive in Linux. How can I boot from this mounted drive using grub (I
>> need to mount the drive before booting to any OS). I could have all the
>> mounting stuff written in a python/bash script. However, is there a way to
>> run that script from GRUB or a GRUB module?
>>
>> Thanks,
>> Swapnesh
>>
>
>
> _______________________________________________
> Grub-devel mailing listGrub-devel@gnu.orghttps://lists.gnu.org/mailman/listinfo/grub-devel
>
>
>

--000e0cd4b40e8d5fe104a652ef1e
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Thanks for the reply Martin, is there any other way to achieve this? I do n=
ot need to python script for it, I need to run an executable which reads th=
e virtual hard-disk. So I think I&#39;ll need to run this executable and ad=
d an entry in grub.conf before the boot menu shows up.<div>
<br></div><div><br></div><div><br><div class=3D"gmail_quote">On Wed, Jun 22=
, 2011 at 2:00 PM, Martin Rosenau <span dir=3D"ltr">&lt;<a href=3D"mailto:m=
artin@rosenau-ka.de">martin@rosenau-ka.de</a>&gt;</span> wrote:<br><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc s=
olid;padding-left:1ex;">
<u></u>

 =20
   =20
   =20
 =20
  <div text=3D"#000000" bgcolor=3D"#ffffff">
    Hello<br>
    <br>
    I do not think you can run Python scripts from GRUB. A Python
    interpreter is a very large program requiring a complete operating
    system. It would be very complex to run such scripts from GRUB...<br>
    <br>
    Martin<br>
    <br>
    <blockquote type=3D"cite"><div class=3D"im">
      <div class=3D"gmail_quote">
        On Tue, Jun 21, 2011 at 3:02 PM, Swapnesh Chaubal <span dir=3D"ltr"=
>&lt;<a href=3D"mailto:schauba@clemson.edu" target=3D"_blank">schauba@clems=
on.edu</a>&gt;</span>
        wrote:<br>
        <blockquote class=3D"gmail_quote" style=3D"margin:0pt 0pt 0pt 0.8ex=
;border-left:1px solid rgb(204, 204, 204);padding-left:1ex">
          Hey folks,<br>
          <br>
          I use a script from VMWare to read a virtual hard-disk and
          then mount it to a drive in Linux. How can I boot from this
          mounted drive using grub (I need to mount the drive before
          booting to any OS). I could have all the mounting stuff
          written in a python/bash script. However, is there a way to
          run that script from GRUB or a GRUB module?<br>
          <br>
          Thanks,<br>
          <font color=3D"#888888">Swapnesh <br>
          </font></blockquote>
      </div>
      <br>
      </div><pre><fieldset></fieldset>
_______________________________________________
Grub-devel mailing list
<a href=3D"mailto:Grub-devel@gnu.org" target=3D"_blank">Grub-devel@gnu.org<=
/a>
<a href=3D"https://lists.gnu.org/mailman/listinfo/grub-devel" target=3D"_bl=
ank">https://lists.gnu.org/mailman/listinfo/grub-devel</a>
</pre>
    </blockquote>
    <br>
  </div>

</blockquote></div><br></div>

--000e0cd4b40e8d5fe104a652ef1e--


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To: The development of GNU GRUB <grub-devel@gnu.org>
Subject: Re: Mounting a virtual hard-disk and booting from it
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On 22.06.2011 22:37, Swapnesh Chaubal wrote:
> Thanks for the reply Martin, is there any other way to achieve this? I
> do not need to python script for it, I need to run an executable which
> reads the virtual hard-disk. So I think I'll need to run this
> executable and add an entry in grub.conf before the boot menu shows up.=

>
Have a look at ubuntu/casper and
http://www.supergrubdisk.org/wiki/Loopback.cfg to see how it's done
properly. It short: you completely miss the point and "running a
program/python script in GRUB" makes little sense. To load linux/initrd
from image from GRUB it's enough 4 simple commands: loopback, linux,
initrd, boot. But you need special initrd to do the rest
>
>
> On Wed, Jun 22, 2011 at 2:00 PM, Martin Rosenau <martin@rosenau-ka.de
> <mailto:martin@rosenau-ka.de>> wrote:
>
>     Hello
>
>     I do not think you can run Python scripts from GRUB. A Python
>     interpreter is a very large program requiring a complete operating
>     system. It would be very complex to run such scripts from GRUB...
>
>     Martin
>
>>     On Tue, Jun 21, 2011 at 3:02 PM, Swapnesh Chaubal
>>     <schauba@clemson.edu <mailto:schauba@clemson.edu>> wrote:
>>
>>         Hey folks,
>>
>>         I use a script from VMWare to read a virtual hard-disk and
>>         then mount it to a drive in Linux. How can I boot from this
>>         mounted drive using grub (I need to mount the drive before
>>         booting to any OS). I could have all the mounting stuff
>>         written in a python/bash script. However, is there a way to
>>         run that script from GRUB or a GRUB module?
>>
>>         Thanks,
>>         Swapnesh
>>
>>
>>
>>     _______________________________________________
>>     Grub-devel mailing list
>>     Grub-devel@gnu.org <mailto:Grub-devel@gnu.org>
>>     https://lists.gnu.org/mailman/listinfo/grub-devel
>
>
>
> _______________________________________________
> Grub-devel mailing list
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--=20
Regards
Vladimir '=CF=86-coder/phcoder' Serbinenko



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Subject: Mounting a virtual hard-disk and booting from it
From: Swapnesh Chaubal <schauba@clemson.edu>
To: The development of GNU GRUB <grub-devel@gnu.org>
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Hey folks,

I use a script from VMWare to read a virtual hard-disk and then mount it to
a drive in Linux. How can I boot from this mounted drive using grub (I need
to mount the drive before booting to any OS). I could have all the mounting
stuff written in a python/bash script. However, is there a way to run that
script from GRUB or a GRUB module?

Thanks,
Swapnesh

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Hey folks,<br><br>I use a script from VMWare to read a virtual hard-disk an=
d then mount it to a drive in Linux. How can I boot from this mounted drive=
 using grub (I need to mount the drive before booting to any OS). I could h=
ave all the mounting stuff written in a python/bash script. However, is the=
re a way to run that script from GRUB or a GRUB module?<br>
<br>Thanks,<br>Swapnesh <br>

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To: The development of GNU GRUB <grub-devel@gnu.org>
Subject: Re: Mounting a virtual hard-disk and booting from it
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On Tue, Jun 21, 2011 at 03:02:14PM -0400, Swapnesh Chaubal wrote:
> I use a script from VMWare to read a virtual hard-disk and then mount it to
> a drive in Linux. How can I boot from this mounted drive using grub (I need
> to mount the drive before booting to any OS). I could have all the mounting
> stuff written in a python/bash script. However, is there a way to run that
> script from GRUB or a GRUB module?

If you expect to do it from an unmodified virtual harddisk, then you
can't.  The software in it almost certainly will expect a real disk
connected to some controller, which the virtual machine software provides.

So you have to at least modify the image to work with a virtual drive
directly.  This means that it must have an initrd that can mount the
real system's drive, find the virtual drive, loop mount that and make
it root and continue booting.

If you have such an initrd and kernel in the virtual drive, then grub
(on the main drive of course, not inside the virtual drive since the host
machine can't read that to boot) can loopback access the image and read
the kernel and initrd and boot those, after which it is entirely up to
the kernel and initrd to actually mount the virtual drive and use it.

The image most likely must be a raw disk image (not .vdi, or .vmk or
any of the other special virtual drive types that are not a stright
collection of disk blocks in a file).

Remember that once grub jumps to the kernel, nothing grub did exists
anymore, so there is no concept of mounting a drive in grub and even if
it could it wouldn't be mounted anymore as soon as you jump to the kernel.
The kernel/initrd must do the mounting.

-- 
Len Sorensen