[PATCH 00/10] Add build and target hash for test results

[Sebastian Huber]

On 24/02/2021 19:49, Gedare Bloom wrote:

> On Wed, Feb 24, 2021 at 11:36 AM Sebastian Huber
> <sebastian.huber at embedded-brains.de>  wrote:
>> On 24/02/2021 19:22, Gedare Bloom wrote:
>>
>>> On Wed, Feb 24, 2021 at 6:57 AM Sebastian Huber
>>> <sebastian.huber at embedded-brains.de>   wrote:
>>>> This patch set adds the new directives rtems_get_build_hash() and
>>>> rtems_get_target_hash() which can be used to differentiate test suite
>>>> results.  See also the following discussion:
>>>>
>>>> https://lists.rtems.org/pipermail/devel/2020-November/063226.html
>>>>
>>>> Sebastian Huber (10):
>>>>     build: Generate build hash
>>>>     rtems: Add rtems_get_build_hash()
>>>>     libtest: Report build hash
>>>>     score: Add _IO_Base64url()
>>>>     score: Add Hash Handler
>>>>     rtems: Add rtems_get_target_hash()
>>>>     Add system initialization step for target hash
>>>>     bsps: Add default rtems_get_target_hash()
>>>>     libtest: Report target hash
>>>>     libtest: Print SHA256 hash in base64url
>>>>
>>> Is there a good reason to use SHA256 over a lighter weight algorithm?
>>> I guess I wonder about the overhead and value of using it.
>>>
>>> We don't need cryptographic security here, we just need a reasonably
>>> non-colliding checksum. The speed of hashing will matter for running
>>> testsuites.
>> SHA256 is currently the best algorithm for 32-bit targets we have in the
>> RTEMS sources. It is also selected for the next Git hash. I don't think
>> the time to calculate the hash really matters and I want to avoid any
>> discussions if MD5 is sufficient or not.
>>
> OK, from a code existence argument this is fine. I could even see a
> possibility to fold in the source code hashes in the future to make a
> "secure" checksum that can be verified at boot-time.
>
If the hash algorithm turns out to be an issue, we can change it. From 
an API point of view it doesn't matter. It just has to be a some string.

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