Re: [XEN PATCH] tools/xenstore: Log xenstored build ID on startup

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 13/11/2020 16:56, Bjoern Doebel wrote:
> On 13.11.20 16:36, Jürgen Groß wrote:
>> On 13.11.20 15:18, Bjoern Doebel wrote:
>>> Right now we do not have a mechanism to determine the version of the
>>> currently running xenstored at runtime. As xenstored runs throughout
>>> the
>>> lifetime of a Xen host, this may lead to problems when newer user space
>>> builds are staged. Then, the running xenstored will no longer match the
>>> version of the installed xenstored.
>>>
>>> To allow users to always identify the running version of xenstored, add
>>> a linker-generated unique build ID to every xenstored build. Add
>>> functionality to log this build ID into a file upon service startup.
>>>
>>> Signed-off-by: Bjoern Doebel <doebel@xxxxxxxxx>
>>> Reviewed-by: Martin Mazein <amazein@xxxxxxxxx>
>>> Reviewed-by: Paul Durrant <pdurrant@xxxxxxxxxxxx>
>>
>> No support for oxenstored or xenstore-stubdom?
>
> Your suggestion further down will apparently help for stubdom. I do
> not speak ocaml at all - how do we address this?

CC'ing Edwin and Christian who have done the bulk of the oxenstored
recently.

It sounds like it might not be possible right now, but would be possible
with a future plan to switch the Ocaml build system over to dune (the
new/preferred Ocaml upstream toolchain).

If it does end up being an XS_CONTROL sub-op, we can implement it at a
future point when we can usefully answer the question.

~Andrew