[poky] [OE-core] RFC: design of network based PR service

[Mark Hatle]

On 4/29/11 12:28 AM, Lu, Lianhao wrote:
> Mark Hatle wrote on 2011-04-29:
>> (adding oe-core back to the list as it got dropped off my previous reply)
>>
>> On 4/28/11 4:04 PM, Joshua Lock wrote:
>>> On Thu, 2011-04-28 at 10:19 -0500, Mark Hatle wrote:
>>>> On 4/28/11 4:22 AM, Martin Jansa wrote:
>>>>> On Thu, Apr 28, 2011 at 03:08:03PM +0800, Lu, Lianhao wrote:
>>>>>> Hi Guys,
>>>>>>
>>>>>> Here is the design of network based PR service, please help to
>>>>>> review and give you comment. Thanks a lot!
>>>>>
>>>>> Hi,
>>>>>
>>>>> looks good, just wondering if we can use the same mechanism for
>>>>> LOCALCOUNT numbers in SRCPV, we can even use same table if we
>>>>> prefix first column ie LOCALCOUNT_${PN} and CheckSum in 2nd column
>>>>> would be actuall git hash (from SRCREV or HEAD for AUTOREV) or 2nd
>>>>> table with similar structure.
>>>>>
>>>>> But it wont work very well if one builder is using AUTOREV and
>>>>> another one isn't, but that can be resolved by allowing only
>>>>> trusted builders with same configuration (wrt AUTOREV) to send such tuples.
>>>>>
>>>>> Do we have at least 2 groups of "users".
>>>>> 1) trusted which increments PR when hash is not found
>>>>> 2) public which can query PR for given hash (not sure what they should
>>>>>    do if hash is not found)
>>>>
>>>> I think this points our something necessary.  There are manual
>>>> indications of a change.  I.e. the current "PR" usage.  If I change
>>>> the recipe, patches, etc I should expect to update the 'PR' to the
>>>> next value.  However, if something ELSE changes (affecting the
>>>> checksum), or an end user forgets to change the PR, the auto
>>>> increment
>> should be used.
>>>
>>> Why would you need to update the PR manually? Detecting changes in
>>> the recipe/patches/etc should all be handled by the checksumming.
>>
>> Checksums and timestamps are not enough to determine a logical
>> progression of the components.
>>
>> We need something that informs the user where these changes fit in the
>> grand scheme of things.  Are they newer or older then a recipe of the
>> same name (and package version)?
>>
>> So this really allows us to visualize multiple levels of upstream work:
>>
>> Level 1 - Upstream "version"  (PV)
>>
>> Level 2 - Upstream (oe-core) recipe versioning (PR)
>>
>> ...
>>
>> Level N - Local build and configuration versioning (checksum based &
>> auto incrementing)
>>
>>
>> In a lot of projects 1, 2 and N are enough.. but it's understandable
>> to add in other intermediate levels to indicate different upstreams along the way.
>> (Such as if a company has their own internal distribution..)
>>
>> I've seen cases where a level 3 exists to indicate a "distribution version"..
>>
>> Level N (when done manually) has usually captured major system
>> configuration changes and rebuilding in order to enable solver tools to upgrade properly.
>>
>>
>> While the checksum will be able to point a unique instance of the
>> recipe to a given PR... it doesn't guaranty any type of logical
>> numbering.. other then a new checksum is a new (presumably larger) PR
>> number.  By adding in the various levels of version information the
>> checksum becomes "more" unique as it only refers to specific
>> 'upstream' revisions, and make it more logical that a level 1, 2, ... N change means it's a "newer" version of the package.
>>
> 
> If a new PV(and/or PR) value comes, does the level N value need to be reset to 0? Or should it continue to increase?

Either behavior will work.  However, I'm used to seeing it reset on a new PV-PR
combination.

This likely means that beyond the checksum, the server will need the PN, PV and
existing PR (the overall 'levels' listed above is really whats needed.. so it
might be arbitrary based on a specific formatting string.)  Then this
combination can be used to generate an existing, the first or the "next" N level
number.

--Mark

> Best Regards,
> Lianhao
> 
> 
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