From: Phillip Wood <phillip.wood123@gmail.com>
To: Junio C Hamano <gitster@pobox.com>,
Phillip Wood <phillip.wood123@gmail.com>
Cc: Toon Claes <toon@iotcl.com>, git@vger.kernel.org
Subject: Re: [PATCH 1/1] cat-file: quote-format name in error when using -z
Date: Tue, 13 Dec 2022 15:06:58 +0000 [thread overview]
Message-ID: <1ea2be75-f67c-fa99-12ed-139825ec5c29@dunelm.org.uk> (raw)
In-Reply-To: <xmqq8rjdv5um.fsf@gitster.g>
On 12/12/2022 00:11, Junio C Hamano wrote:
> Phillip Wood <phillip.wood123@gmail.com> writes:
>
>> Without "-z" you cannot pass object names that contain newlines so not
>> quoting the output does not cause a problem. We could start quoting
>> the object name without "-z" but we'd be changing the output without a
>> huge benefit.
>
> That's fair. The next question is from a devil's advocate:
> is switching to the full cquote the best thing to do?
>
> If we were using the full cquote from the very beginning, of course
> it is, simply because that is what is used in all other places in
> Git. Using the full cquote does mean a LF byte will be protected
> (i.e. instead of shown literally in the middle of other letters
> around LF, "other\nletters around LF" would be shown), but pathnames
> with backslashes and double quotes in them that have been shown
> without problems would be shown differently and will break existing
> parsers, which are written lazily with the assumption that they are
> perfectly happy to be "simple" thans to not having to deal with LF
> (because in their environment a path with LF in it do not matter).
>
> A bit safer thing to do is to replace LF (and not any other bytes
> that would be quoted with full cquote) in the path given in these
> messages with something else (like NUL to truncate the output
> there). As these answers are given in order, the object names are
> not absolutely needed to identify and match up the input and the
> output, and properly written parsers would be prepared to see a
> response with an object name that it did not request and handle it
> sanely, such a change may not break such a parser for a path with
> any byte that are modified with full cquote.
>
> The above is with a devil's adovocate hat on, and I do not care too
> much, as I do not think butchering backslash with full cquote would
> not hurt even existing Windows users (if "HEAD:t\README.txt" named
> the same blob as "HEAD:t/README.txt" on a platform, doubling the
> backslashes in the output would have made quite a lot of damage, but
> I do not think we allow backslashes to name tree paths).
By default quoting also affects names that contain non-ascii characters.
If we're worried about that we could only quote names that contain LF
but as you point out the answers are given in order so I don't think
there should be a problem with calling cquote unconditionally. (As this
option has only existed for one release I suspect there aren't that many
users yet as well)
Best Wishes
Phillip
> By the way, there is another use of obj_name in batch_object_write()
> that can show whatever byte in it literally to the output.
>
> Thanks.
next prev parent reply other threads:[~2022-12-13 15:07 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-09 15:00 [PATCH 0/1] cat-file: quote-format name in error when using -z Toon Claes
2022-12-09 15:00 ` [PATCH 1/1] " Toon Claes
2022-12-09 19:33 ` Phillip Wood
2022-12-09 23:58 ` Junio C Hamano
2022-12-11 16:30 ` Phillip Wood
2022-12-12 0:11 ` Junio C Hamano
2022-12-12 11:34 ` Toon Claes
2022-12-12 22:09 ` Junio C Hamano
2022-12-13 15:06 ` Phillip Wood [this message]
2022-12-14 8:29 ` Junio C Hamano
2022-12-20 5:31 ` Toon Claes
2022-12-20 10:18 ` Phillip Wood
2022-12-21 12:42 ` Toon Claes
2023-01-05 6:24 ` [PATCH v2 0/1] " Toon Claes
2023-01-05 6:24 ` [PATCH v2 1/1] " Toon Claes
2023-01-16 19:07 ` [PATCH v3 0/1] " Toon Claes
2023-01-16 19:07 ` [PATCH v3 1/1] " Toon Claes
2023-01-17 15:24 ` Phillip Wood
2023-03-03 19:17 ` [PATCH v4 0/2] " Toon Claes
2023-03-03 19:17 ` [PATCH v4 1/2] cat-file: extract printing batch error message into function Toon Claes
2023-03-03 20:26 ` Junio C Hamano
2023-03-03 23:14 ` Junio C Hamano
2023-05-10 19:01 ` [PATCH v5 0/1] cat-file: quote-format name in error when using -z Toon Claes
2023-05-10 19:01 ` [PATCH v5 1/1] " Toon Claes
2023-05-10 20:13 ` Junio C Hamano
2023-05-12 8:54 ` Toon Claes
2023-05-12 16:57 ` Junio C Hamano
2023-05-15 8:47 ` Phillip Wood
2023-05-15 17:20 ` Junio C Hamano
2023-06-02 13:29 ` Phillip Wood
2023-03-03 19:17 ` [PATCH v4 2/2] " Toon Claes
2023-03-03 20:14 ` [PATCH v4 0/2] " Junio C Hamano
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