Re: [Xen-devel] sidecar (hvm shim) creation script

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 01/10/2018 11:08 PM, Doug Goldstein wrote:
> On 1/10/18 9:39 AM, Ian Jackson wrote:
>> Ian Jackson writes ("Re: sidecar (hvm shim) creation script"):
>>> Here is the converter script where I just got my guest to boot with
>>> the Vixen shim, as built and provided by Wei.
>>
>> And here is one which handles the guest console correctly.  Vixen
>> sends the L2 guest console to the emulated serial, along with the
>> shim's own output.
>>
>>
> 
> So, not that I don't like executing another language interpreter from
> another language interpreter (insert yodawg meme here), but how would
> you feel about a Python version? The system I'm currently dealing with
> needs to import this code as a Python module so I figured I'd slap a
> main() and some argparse on it and it should be good.

From what I understand, Ian's decision tree looked like this:

1. For parsing xl.cfg, the options are "use python" or "write a brand
new parser for the python-like xl.cfg syntax".  That's pretty much a
no-brainer.

2. Given that the aim of the shim is to hand to people running systems
as old as Xen 3.4, the script needs to run identically, without issue,
on a wide range of systems.  In his estimation, his ability to write
such "lowest-common-denominator" perl was much higher than his ability
to write "lowest-common-denominator" python.

If anyone stepped to write and maintain a version of the script that can
run as well under Python 2.2 as under 2.7, he'd probably be happy to
avoid using three different languages.

 -George

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