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Re: [Xen-devel] [PATCH v2 03/17] tools/migration: Drop IHDR_VERSION constant from libxc and python
- To: Ian Jackson <ian.jackson@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 24 Feb 2020 17:32:47 +0000
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Mon, 24 Feb 2020 17:32:54 +0000
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On 24/02/2020 17:25, Ian Jackson wrote:
> Andrew Cooper writes ("[PATCH v2 03/17] tools/migration: Drop IHDR_VERSION
> constant from libxc and python"):
>> Migration v3 is in the process of being introduced, meaning that the code has
>> to cope with both versions. Use an explicit 2 for now.
>>
>> For the verify-stream-v2 and convert-legacy-stream scripts, update
>> text to say "v2 (or later)". What matters is the distinction vs
>> legacy streams.
> Can I request that you use a manifest constant for `2', rather than
> sprinkling literal `2's everywhere ? Something like IHDR_VERSION_2 ?
> This may seem pointless, but it will mean that it is possible to grep
> the code much more easily for things which are relevant to v2 or v3 or
> whatever.
>
> (I don't it's necessary to go to any great lengths to substitute the
> value of IHDR_VERSION_2 into error messages; a literal 2 in the string
> is OK I think.)
As I reply previously... The value comes out of a pipe, and is checked
exactly once.
You can already grep for everything, using format_version which is where
this number is stashed for the duration of restore.
~Andrew
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