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Re: Issue tracker housecleaning: SVN-1804

From: Yasuhito FUTATSUKI <futatuki_at_poem.co.jp>
Date: Mon, 4 Nov 2019 15:29:31 +0900

On 2019/11/04 13:50, Daniel Shahaf wrote:
> Yasuhito FUTATSUKI wrote on Mon, Nov 04, 2019 at 11:13:38 +0900:
>> On 2019/11/04 8:16, Nathan Hartman wrote:
>>> On Sun, Nov 3, 2019 at 12:56 AM Nathan Hartman <hartman.nathan_at_gmail.com>
>>> wrote:
>>> It seems there's another problem.
>>> Apparently the 'raise .. from' construct is Python 3+. Which means
>>> this breaks the mailer for Python 2.7. I found this when I tested on
>>> Python 2.7 earlier and the script terminated with a syntax error at
>>> 'raise MessageSendFailure from detail'.
>>> Which do you think is better:
>>> Remove the 'from detail' and lose the original cause of
>>> MessageSendFailure. MessageSendFailure is meant to be handled and
>>> ignored (possibly only used for outputting additional logging),
>>> allowing the mailer to continue mailing, so this might be acceptable.
>>> Or, alternately:
>>> Check which version of Python is running, use 'from detail' only when
>>> Python 3+.
>> The latter can't accomplish with only single script, because syntax
>> error occurs on parse on loading, not on execution. To hide
>> 'from detail' from Python 2 interpreter, we should get it out of
>> the script.
> We could do:
> try:
> # py3
> eval("raise MessageSendFailure from detail")
> except SyntaxError:
> # py2
> raise MessageSendFailure

Ah, I see.
> Or we could just keep the «raise … from» construct in there, unconditional, and
> bump the script's minimum Python veneed rsion to 3 on trunk. Analysis:
> + I assume everyone has a py3 interpreter these days, even people whose distros
> will continue to support py2 past its EOL date.
> + trunk will be released in April. That's four months _after_ py2's upstream EOL.
> - It's possible that some downstreams run distros that will support py2 past
> its EOL date, have written py2 code that extends mailer.py, and won't have
> gotten around to upgrading their custom extensions to py3 by April.

In any case, To get mailer.py to work with Python 3, more fix is needed.
Our svn.* modules map `char *' to `bytes' object, but current mailer.py doesn't
care bytes vs str problems.

(Though it is not related to this analysis and to the discussion about py2 support.)


Yasuhito FUTATSUKI <futatuki_at_yf.bsdclub.org>/<futatuki_at_poem.co.jp>
Received on 2019-11-04 07:30:08 CET

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