Re: Fw: Curiosity

From: Junio C Hamano <gitster@pobox.com>
Date: Dec 18, 2021, 00:24 UTC
Message-ID: <xmqq1r2a220u.fsf@gitster.g>
In-Reply-To: <1X3gQ48NK5aBDHcpYMlxESRjqubcCBKJUQu2K0dBOnTyvsXCXXoGDBg2Ff4KarK6WsZnzN3HgqHGOlCKKdF-wtZQ5tHsoAcfit2CTXMWqh4=@protonmail.com>

João Victor Bonfim  <JoaoVictorBonfim@protonmail.com> writes:

Show 9 quoted lines

>> I suspect that for most algorithms and their implementations, this would
>>
>> not result in repeatable "recompressed" results. Thus the checked-out
>>
>> files might be different every time you checked them out. :(
>
> How or why?
>
> Sincere question.

Two immediate things that come to my mind are lossy compression algorithms (jpeg pictures?) and compressors that do not necessarily produce bit-for-bit identical results (e.g. gzip by default embeds timestamp unless explicitly told not to from a command line option).