On 10 June 2015 at 01:59, Ximin Luo <infini...@pwned.gg> wrote:
> Given the above, I think it would still be good to define SOURCE_DATE as I 
> originally suggested:
>
> SOURCE_DATE = "$(date -d "$(dpkg-parsechangelog --count 1 -SDate)" 
> --iso-8601=seconds)" # includes the TZ offset
>
> - if the language/tool already has/uses a ISO8601 parser in its standard 
> library, this is as convenient as the previous SOURCE_DATE_UTC
> - if the language/tool doesn't have/use one, then SOURCE_DATE_UTC doesn't 
> actually give us any benefits:
>   - it's far easier to use SOURCE_DATE_EPOCH, if you want to play with the 
> date programmatically
>   - OTOH if you're just going to take substrings/regex-match it, this works 
> just as easily for SOURCE_DATE vs SOURCE_DATE_UTC, and the former contains 
> more information
>
> But I care less about this latter point; the main point of this email is to 
> argue for SOURCE_DATE_EPOCH over SOURCE_DATE_UTC (iso8601 locked to "Z" 
> timezone).

I disagree that SOURCE_DATE_UTC provides no benefit over SOURCE_DATE:
at the very least, a program could choose to use it as an
uninterpreted string (similar to the proposed --date option at the
start of this bug, but from the environment rather than a flag).
SOURCE_DATE with an arbitrary offset not so much.

I'm happy to accept SOURCE_DATE, SOURCE_DATE_UTC, SOURCE_DATE_EPOCH or
even SOURCE_DATE_EXTRACTED_FROM_DEBIAN_CHANGELOG_WITH_NO_INTERPRETATION
however.  Pick one.

--bod


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