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From: Adam Dinwoodie <adam@dinwoodie.org>
To: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Cc: Junio C Hamano <gitster@pobox.com>, git@vger.kernel.org
Subject: Re: [PATCH v6+ 2/7] archive --add-virtual-file: allow paths containing colons
Date: Mon, 20 Jun 2022 10:41:41 +0100	[thread overview]
Message-ID: <20220620094141.uwvofvefoq26xxdu@lucy.dinwoodie.org> (raw)
In-Reply-To: <nycvar.QRO.7.76.6.2206182213290.349@tvgsbejvaqbjf.bet>

On Sat, Jun 18, 2022 at 10:19:28PM +0200, Johannes Schindelin wrote:
> Hi Adam,
> 
> On Wed, 15 Jun 2022, Adam Dinwoodie wrote:
> 
> > On Wed, Jun 15, 2022 at 01:00:07PM -0700, Junio C Hamano wrote:
> > > Adam Dinwoodie <adam@dinwoodie.org> writes:
> > >
> > > >> diff --git a/t/t5003-archive-zip.sh b/t/t5003-archive-zip.sh
> > > >> index d6027189e2..3992d08158 100755
> > > >> --- a/t/t5003-archive-zip.sh
> > > >> +++ b/t/t5003-archive-zip.sh
> > > >> @@ -207,13 +207,21 @@ check_zip with_untracked
> > > >>  check_added with_untracked untracked untracked
> > > >>
> > > >>  test_expect_success UNZIP 'git archive --format=zip --add-virtual-file' '
> > > >> +	if test_have_prereq FUNNYNAMES
> > > >> +	then
> > > >> +		PATHNAME="pathname with : colon"
> > > >> +	else
> > > >> +		PATHNAME="pathname without colon"
> > > >> +	fi &&
> > > >>  	git archive --format=zip >with_file_with_content.zip \
> > > >> +		--add-virtual-file=\""$PATHNAME"\": \
> > > >>  		--add-virtual-file=hello:world $EMPTY_TREE &&
> > > >>  	test_when_finished "rm -rf tmp-unpack" &&
> > > >>  	mkdir tmp-unpack && (
> > > >>  		cd tmp-unpack &&
> > > >>  		"$GIT_UNZIP" ../with_file_with_content.zip &&
> > > >>  		test_path_is_file hello &&
> > > >> +		test_path_is_file "$PATHNAME" &&
> > > >>  		test world = $(cat hello)
> > > >>  	)
> > > >>  '
> > > >
> > > > This test is currently failing on Cygwin: it looks like it's exposing a
> > > > bug in Cygwin that means files with colons in their name aren't
> > > > correctly extracted from zip archives.  I'm going to report that to the
> > > > Cygwin mailing list, but I wanted to note it for the record here, too.
> > >
> > > Does this mean that our code to set FUNNYNAMES prerequiste is
> > > slightly broken?  IOW, should we check with a path with a colon in
> > > it, as well as whatever we use currently for FUNNYNAMES?
> > >
> > > Something like the attached patch?
> > >
> > > Or does Cygwin otherwise work perfectly well with a path with a
> > > colon in it, but only $GIT_UNZIP command has problem with it?  If
> > > that is the case, then please disregard the attached.
> >
> > The latter: Cygwin works perfectly with paths containing colons, except
> > that Cygwin's `unzip` is seemingly buggy and doesn't work.  The file
> > systems Cygwin runs on don't support colons in paths, but Cygwin hides
> > that problem by rewriting ASCII colons to some high Unicode code point
> > on the filesystem,
> 
> Let me throw in a bit more detail: The forbidden characters are mapped
> into the Unicode page U+f0XX, which is supposed to be used "for private
> purposes". Even more detail can be found here:
> https://github.com/cygwin/cygwin/blob/cygwin-3_3_5-release/winsup/cygwin/strfuncs.cc#L19-L23
> 
> > meaning Cygwin-native applications see a regular colon, while
> > Windows-native applications see an unusual but perfectly valid Unicode
> > character.
> 
> Now, I have two questions:
> 
> - Why does `unzip` not use Cygwin's regular functions (which should all be
>   aware of that U+f0XX <-> U+00XX mapping)?

That is an excellent question!  This behaviour came from an `#ifdef
__CYGWIN__` in the upstream unzip package; with that #ifdef removed,
everything works as expected.  The folk on the Cygwin mailing list had
no idea *why* that #ifdef was there, given it's evidently unnecessary;
my best guess is that it was added a long time ago before Cygwin could
handle those characters in the general case.

Since my report, the Cygwin package has picked up a new maintainer who
has released a version of the unzip package with that #ifdef removed, so
this test is now passing.

> - Even more importantly: would the test case pass if we simply used
>   another forbidden character, such as `?` or `*`?

The set of characters that had special handling in unzip was "*:?|<> all
of which are handled appropriately by Cygwin applications in general,
and all of which had this unnecessary handling in `unzip`

> > I tested the same patch to FUNNYNAMES myself before reporting, and the
> > test fails exactly the same way.  If we wanted to catch this, I think
> > we'd need a test that explicitly attempted to unzip an archive
> > containing a path with a colon.
> >
> > (The code to set FUNNYNAMES *is* slightly broken, per the discussions
> > around 6d340dfaef ("t9902: split test to run on appropriate systems",
> > 2022-04-08), and my to-do list still features tidying up and
> > resubmitting the patch Ævar wrote in that discussion thread.  But it
> > wouldn't help here because this issue is specific to Cygwin's `unzip`,
> > rather than a general limitation of running on Cygwin.)
> 
> I'd rather avoid changing FUNNYNAMES at this stage, if we can help it.

Oh yes, I definitely wasn't proposing changing things for 2.37.0!  I
just wanted to acknowledge that there is a known issue here that has
been discussed on this list previously, that we (I) would hopefully get
around to fixing at some point.

Adam

  parent reply	other threads:[~2022-06-20  9:46 UTC|newest]

Thread overview: 140+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-26  8:41 [PATCH 0/5] scalar: implement the subcommand "diagnose" Johannes Schindelin via GitGitGadget
2022-01-26  8:41 ` [PATCH 1/5] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-01-26  9:34   ` René Scharfe
2022-01-26 22:20     ` Taylor Blau
2022-02-06 21:34       ` Johannes Schindelin
2022-01-27 19:38   ` Elijah Newren
2022-01-26  8:41 ` [PATCH 2/5] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-01-26  8:41 ` [PATCH 3/5] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-01-26 22:43   ` Taylor Blau
2022-01-27 15:14     ` Derrick Stolee
2022-02-06 21:38       ` Johannes Schindelin
2022-01-26  8:41 ` [PATCH 4/5] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-01-26 22:50   ` Taylor Blau
2022-01-27 15:17     ` Derrick Stolee
2022-01-27 18:59   ` Elijah Newren
2022-02-06 21:25     ` Johannes Schindelin
2022-01-26  8:41 ` [PATCH 5/5] scalar diagnose: show a spinner while staging content Johannes Schindelin via GitGitGadget
2022-01-27 15:19 ` [PATCH 0/5] scalar: implement the subcommand "diagnose" Derrick Stolee
2022-02-06 21:13   ` Johannes Schindelin
2022-02-06 22:39 ` [PATCH v2 0/6] " Johannes Schindelin via GitGitGadget
2022-02-06 22:39   ` [PATCH v2 1/6] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-02-07 19:55     ` René Scharfe
2022-02-07 23:30       ` Junio C Hamano
2022-02-08 13:12         ` Johannes Schindelin
2022-02-08 17:44           ` Junio C Hamano
2022-02-08 20:58             ` René Scharfe
2022-02-09 22:48               ` Junio C Hamano
2022-02-10 19:10                 ` René Scharfe
2022-02-10 19:23                   ` Junio C Hamano
2022-02-11 19:16                     ` René Scharfe
2022-02-11 21:27                       ` Junio C Hamano
2022-02-12  9:12                         ` René Scharfe
2022-02-13  6:25                           ` Junio C Hamano
2022-02-13  9:02                             ` René Scharfe
2022-02-14 17:22                               ` Junio C Hamano
2022-02-08 12:54       ` Johannes Schindelin
2022-02-06 22:39   ` [PATCH v2 2/6] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-02-06 22:39   ` [PATCH v2 3/6] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-02-07 19:55     ` René Scharfe
2022-02-08 12:08       ` Johannes Schindelin
2022-02-06 22:39   ` [PATCH v2 4/6] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-02-06 22:39   ` [PATCH v2 5/6] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-02-06 22:39   ` [PATCH v2 6/6] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-04 15:25   ` [PATCH v3 0/7] scalar: implement the subcommand "diagnose" Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 1/7] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 2/7] archive --add-file-with-contents: allow paths containing colons Johannes Schindelin via GitGitGadget
2022-05-07  2:06       ` Elijah Newren
2022-05-09 21:04         ` Johannes Schindelin
2022-05-04 15:25     ` [PATCH v3 3/7] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 4/7] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 5/7] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 6/7] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-05-04 15:25     ` [PATCH v3 7/7] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-07  2:23     ` [PATCH v3 0/7] scalar: implement the subcommand "diagnose" Elijah Newren
2022-05-10 19:26     ` [PATCH v4 " Johannes Schindelin via GitGitGadget
2022-05-10 19:26       ` [PATCH v4 1/7] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-05-10 21:48         ` Junio C Hamano
2022-05-10 22:06           ` rsbecker
2022-05-10 23:21             ` Junio C Hamano
2022-05-11 16:14               ` René Scharfe
2022-05-11 19:27                 ` Junio C Hamano
2022-05-12 16:16                   ` René Scharfe
2022-05-12 18:15                     ` Junio C Hamano
2022-05-12 21:31                       ` Junio C Hamano
2022-05-14  7:06                         ` René Scharfe
2022-05-12 22:31           ` [PATCH] fixup! " Junio C Hamano
2022-05-10 19:26       ` [PATCH v4 2/7] archive --add-file-with-contents: allow paths containing colons Johannes Schindelin via GitGitGadget
2022-05-10 21:56         ` Junio C Hamano
2022-05-10 22:23           ` rsbecker
2022-05-19 18:12             ` Johannes Schindelin
2022-05-19 18:09           ` Johannes Schindelin
2022-05-19 18:44             ` Junio C Hamano
2022-05-10 19:27       ` [PATCH v4 3/7] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-05-17 14:51         ` Ævar Arnfjörð Bjarmason
2022-05-18 17:35           ` Junio C Hamano
2022-05-20  7:30             ` Ævar Arnfjörð Bjarmason
2022-05-20 15:55               ` Johannes Schindelin
2022-05-21  9:54                 ` Ævar Arnfjörð Bjarmason
2022-05-22  5:50                   ` Junio C Hamano
2022-05-24 12:25                     ` Johannes Schindelin
2022-05-24 18:11                       ` Ævar Arnfjörð Bjarmason
2022-05-24 19:29                         ` Junio C Hamano
2022-05-25 10:31                           ` Johannes Schindelin
2022-05-10 19:27       ` [PATCH v4 4/7] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-05-17 14:53         ` Ævar Arnfjörð Bjarmason
2022-05-10 19:27       ` [PATCH v4 5/7] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-05-10 19:27       ` [PATCH v4 6/7] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-05-10 19:27       ` [PATCH v4 7/7] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-17 15:03       ` [PATCH v4 0/7] scalar: implement the subcommand "diagnose" Ævar Arnfjörð Bjarmason
2022-05-17 15:28         ` rsbecker
2022-05-19 18:17           ` Johannes Schindelin
2022-05-19 18:17       ` [PATCH v5 " Johannes Schindelin via GitGitGadget
2022-05-19 18:17         ` [PATCH v5 1/7] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-05-20 14:41           ` René Scharfe
2022-05-20 16:21             ` Junio C Hamano
2022-05-19 18:17         ` [PATCH v5 2/7] archive --add-file-with-contents: allow paths containing colons Johannes Schindelin via GitGitGadget
2022-05-19 18:17         ` [PATCH v5 3/7] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-05-19 18:18         ` [PATCH v5 4/7] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-05-19 18:18         ` [PATCH v5 5/7] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-05-19 18:18         ` [PATCH v5 6/7] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-05-19 18:18         ` [PATCH v5 7/7] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-19 19:23         ` [PATCH v5 0/7] scalar: implement the subcommand "diagnose" Junio C Hamano
2022-05-21 15:08         ` [PATCH v6 " Johannes Schindelin via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 1/7] archive: optionally add "virtual" files Johannes Schindelin via GitGitGadget
2022-05-25 21:11             ` Junio C Hamano
2022-05-26  9:09               ` René Scharfe
2022-05-26 17:10                 ` Junio C Hamano
2022-05-26 18:57                   ` René Scharfe
2022-05-26 20:16                     ` Junio C Hamano
2022-05-27 17:02                       ` René Scharfe
2022-05-27 19:01                         ` Junio C Hamano
2022-05-28  6:57                           ` René Scharfe
2022-05-21 15:08           ` [PATCH v6 2/7] archive --add-virtual-file: allow paths containing colons Johannes Schindelin via GitGitGadget
2022-05-25 20:22             ` Junio C Hamano
2022-05-25 21:42               ` Junio C Hamano
2022-05-25 22:34                 ` Junio C Hamano
2022-05-21 15:08           ` [PATCH v6 3/7] scalar: validate the optional enlistment argument Johannes Schindelin via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 4/7] Implement `scalar diagnose` Johannes Schindelin via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 5/7] scalar diagnose: include disk space information Johannes Schindelin via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 6/7] scalar: teach `diagnose` to gather packfile info Matthew John Cheetham via GitGitGadget
2022-05-21 15:08           ` [PATCH v6 7/7] scalar: teach `diagnose` to gather loose objects information Matthew John Cheetham via GitGitGadget
2022-05-28 23:11           ` [PATCH v6+ 0/7] js/scalar-diagnose rebased Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 1/7] archive: optionally add "virtual" files Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 2/7] archive --add-virtual-file: allow paths containing colons Junio C Hamano
2022-06-15 18:16               ` Adam Dinwoodie
2022-06-15 20:00                 ` Junio C Hamano
2022-06-15 21:36                   ` Adam Dinwoodie
2022-06-18 20:19                     ` Johannes Schindelin
2022-06-18 22:05                       ` Junio C Hamano
2022-06-20  9:41                       ` Adam Dinwoodie [this message]
2022-05-28 23:11             ` [PATCH v6+ 3/7] scalar: validate the optional enlistment argument Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 4/7] scalar: implement `scalar diagnose` Junio C Hamano
2022-06-10  2:08               ` Ævar Arnfjörð Bjarmason
2022-06-10 16:44                 ` Junio C Hamano
2022-06-10 17:35                   ` Ævar Arnfjörð Bjarmason
2022-05-28 23:11             ` [PATCH v6+ 5/7] scalar diagnose: include disk space information Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 6/7] scalar: teach `diagnose` to gather packfile info Junio C Hamano
2022-05-28 23:11             ` [PATCH v6+ 7/7] scalar: teach `diagnose` to gather loose objects information Junio C Hamano
2022-05-30 10:12             ` [PATCH v6+ 0/7] js/scalar-diagnose rebased Johannes Schindelin
2022-05-30 17:37               ` Junio C Hamano

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