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From: Jeff Hostetler <git@jeffhostetler.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: "Eric DeCosta via GitGitGadget" <gitgitgadget@gmail.com>,
	git@vger.kernel.org, "Eric Sunshine" <sunshine@sunshineco.com>,
	"Torsten Bögershausen" <tboegi@web.de>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	"Ramsay Jones" <ramsay@ramsayjones.plus.com>,
	"Johannes Schindelin" <Johannes.Schindelin@gmx.de>,
	"Eric DeCosta" <edecosta@mathworks.com>
Subject: Re: [PATCH v7 2/6] fsmonitor: relocate socket file if .git directory is remote
Date: Mon, 19 Sep 2022 13:08:53 -0400	[thread overview]
Message-ID: <40b47246-adb6-cf56-02ef-25ab1429a42e@jeffhostetler.com> (raw)
In-Reply-To: <xmqq35cnco3h.fsf@gitster.g>



On 9/19/22 12:42 PM, Junio C Hamano wrote:
> Jeff Hostetler <git@jeffhostetler.com> writes:
> 
>> On 9/16/22 4:11 PM, Junio C Hamano wrote:
>>> "Eric DeCosta via GitGitGadget" <gitgitgadget@gmail.com> writes:
>>>
>>>> +const char *fsmonitor_ipc__get_path(struct repository *r)
>>>> +{
>>>> +	static const char *ipc_path;
>>>> +	SHA_CTX sha1ctx;
>>>> +	char *sock_dir;
>>>> +	struct strbuf ipc_file = STRBUF_INIT;
>>>> +	unsigned char hash[SHA_DIGEST_LENGTH];
>>>> +
>>>> +	if (ipc_path)
>>>> +		return ipc_path;
>>>> +
>>>> +	if (!r)
>>>> +		r = the_repository;
>>> I'd prefer not to see this "NULL means the_repository".  It would be
>>> a different story if the caller does not necessarily have a ready
>>> access to the_repository, but it is a global, so the caller can pass
>>> the_repository and be more explicit.  Giving two ways to the caller
>>> to express same thing is not a good idea.
>>> Thanks.
>>>
>>
>> To be fair, I added several "if (!r) r = the_repository;" statements
>> to the original public FSMonitor routines.  There were obscure cases
>> where tests would sometimes randomly fail because "r" wasn't completely
>> passed down via some hard to isolate call stack.  Offlist, AEvar told me
>> that he managed to isolate it and has a fix.
>>
>> So eventually, we'll be able to get rid of all of these direct
>> references to "the_repository" and properly assume that "r" is
>> always passed down.
>>
>> But for now, I think we should let this stay for safety.
> 
> I wouldn't call "sweeping a breakage under the rug" a "safety",
> though.  If the caller cannot decide which repository instance is
> the right thing to pass, or the caller does not yet have a good one
> to pass when making a call down the codepath, how can it be safer to
> use the_repository that may or may not be the appropriate one than
> noticing the problem by dying and stopping the spread of damage?
> 

Aren't we in the middle of a transition from always
using the global "the_repository" to a passed "r" variable?
We're getting closer to being able to hide the the global
symbol, but we're not there yet, right?

I'm thinking that at as long as the global exists, we are not
safe to have multiple "struct repository" instances, right?

All I'm saying is that there are obscure/edge code paths where
a valid "r" is not being passed down.  Or, more likely, someone
has an "istate" that doesn't yet have "istate->repo" set at the
point of the call, so they might be passing "istate->repo", but
it is null.

Tracking down these nulls is important, but shouldn't it be
independent of this one?

Jeff

  reply	other threads:[~2022-09-19 17:11 UTC|newest]

Thread overview: 170+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-18 20:48 [PATCH] fsmonitor: option to allow fsmonitor to run against network-mounted repos Eric DeCosta via GitGitGadget
2022-08-18 21:35 ` Junio C Hamano
2022-08-18 21:38   ` Junio C Hamano
2022-08-19 10:05 ` Johannes Schindelin
2022-08-19 16:50 ` Jeff Hostetler
2022-08-19 18:38   ` Eric DeCosta
2022-08-19 20:15     ` Jeff Hostetler
2022-08-19 17:48 ` Eric Sunshine
2022-08-19 18:58 ` Torsten Bögershausen
2022-08-20 22:24 ` Junio C Hamano
2022-08-22 13:22   ` Johannes Schindelin
2022-08-22 16:07     ` Junio C Hamano
2022-08-23 13:51     ` Jeff Hostetler
2022-08-24 15:45       ` Eric DeCosta
2022-08-23 13:03 ` [PATCH v2 0/4] " Eric DeCosta via GitGitGadget
2022-08-23 13:03   ` [PATCH v2 1/4] " Eric DeCosta via GitGitGadget
2022-08-23 13:03   ` [PATCH v2 2/4] fsmonitor: macOS: " Eric DeCosta via GitGitGadget
2022-08-23 13:03   ` [PATCH v2 3/4] Check working directory and Unix domain socket file for compatability edecosta via GitGitGadget
2022-08-23 13:03   ` [PATCH v2 4/4] Minor refactoring and simplification of Windows settings checks edecosta via GitGitGadget
2022-08-23 18:55   ` [PATCH v3 0/2] fsmonitor: option to allow fsmonitor to run against network-mounted repos Eric DeCosta via GitGitGadget
2022-08-23 18:55     ` [PATCH v3 1/2] fsmonitor: macOS: " Eric DeCosta via GitGitGadget
2022-08-23 18:55     ` [PATCH v3 2/2] Check working directory and Unix domain socket file for compatability edecosta via GitGitGadget
2022-08-24 20:31       ` Junio C Hamano
2022-08-24 16:46     ` [PATCH v3 0/2] fsmonitor: option to allow fsmonitor to run against network-mounted repos Junio C Hamano
2022-08-31 16:09     ` [PATCH v4 0/4] " Eric DeCosta via GitGitGadget
2022-08-31 16:09       ` [PATCH v4 1/4] fsmonitor: add two new config options, allowRemote and socketDir Eric DeCosta via GitGitGadget
2022-08-31 19:41         ` Ævar Arnfjörð Bjarmason
2022-08-31 20:04         ` Junio C Hamano
2022-09-01  2:25           ` Ramsay Jones
2022-09-01 17:53         ` Jeff Hostetler
2022-09-01 18:04         ` Jeff Hostetler
2022-09-01 21:21         ` Jeff Hostetler
2022-09-02 16:54           ` Eric DeCosta
2022-09-06 14:27             ` Jeff Hostetler
2022-08-31 16:09       ` [PATCH v4 2/4] fsmonitor: generate unique Unix socket file name in the desired location Eric DeCosta via GitGitGadget
2022-08-31 19:49         ` Ævar Arnfjörð Bjarmason
2022-08-31 20:11         ` Junio C Hamano
2022-08-31 16:09       ` [PATCH v4 3/4] fsmonitor: ensure filesystem and unix socket filesystem are compatible Eric DeCosta via GitGitGadget
2022-08-31 16:09       ` [PATCH v4 4/4] fsmonitor: normalize FSEvents event paths to the real path Eric DeCosta via GitGitGadget
2022-08-31 19:37         ` Ævar Arnfjörð Bjarmason
2022-09-01 20:05         ` Jeff Hostetler
2022-09-02 16:35           ` Eric DeCosta
2022-09-06 17:13             ` Jeff Hostetler
2022-09-06 19:02               ` Eric DeCosta
2022-09-06 19:33                 ` Eric DeCosta
2022-09-06 22:11                   ` Eric DeCosta
2022-09-07 19:14                   ` Jeff Hostetler
2022-09-07 23:04                     ` Eric DeCosta
2022-09-10 20:00       ` [PATCH v5 0/4] fsmonitor: option to allow fsmonitor to run against network-mounted repos Eric DeCosta via GitGitGadget
2022-09-10 20:00         ` [PATCH v5 1/4] fsmonitor: refactor filesystem checks to common interface Eric DeCosta via GitGitGadget
2022-09-10 20:00         ` [PATCH v5 2/4] fsmonitor: relocate socket file if .git directory is remote Eric DeCosta via GitGitGadget
2022-09-10 20:00         ` [PATCH v5 3/4] fsmonitor: avoid socket location check if using hook Eric DeCosta via GitGitGadget
2022-09-10 20:00         ` [PATCH v5 4/4] fsmonitor: deal with synthetic firmlinks on macOS Eric DeCosta via GitGitGadget
2022-09-11  1:01           ` Eric Sunshine
2022-09-12 15:27         ` [PATCH v5 0/4] fsmonitor: option to allow fsmonitor to run against network-mounted repos Junio C Hamano
2022-09-12 19:37           ` Junio C Hamano
2022-09-12 19:39             ` Eric DeCosta
2022-09-12 15:35         ` Junio C Hamano
2022-09-12 19:35           ` Eric DeCosta
2022-09-13 20:27         ` [PATCH v6 0/6] " Eric DeCosta via GitGitGadget
2022-09-13 20:27           ` [PATCH v6 1/6] " Eric DeCosta via GitGitGadget
2022-09-13 20:27           ` [PATCH v6 2/6] fsmonitor: refactor filesystem checks to common interface Eric DeCosta via GitGitGadget
2022-09-13 20:27           ` [PATCH v6 3/6] fsmonitor: relocate socket file if .git directory is remote Eric DeCosta via GitGitGadget
2022-09-14  0:48             ` Junio C Hamano
2022-09-14 15:47               ` Eric DeCosta
2022-09-13 20:27           ` [PATCH v6 4/6] fsmonitor: avoid socket location check if using hook Eric DeCosta via GitGitGadget
2022-09-14  1:48             ` Junio C Hamano
2022-09-13 20:27           ` [PATCH v6 5/6] fsmonitor: deal with synthetic firmlinks on macOS Eric DeCosta via GitGitGadget
2022-09-13 20:27           ` [PATCH v6 6/6] fsmonitor: add documentation for allowRemote and socketDir options Eric DeCosta via GitGitGadget
2022-09-16 17:58           ` [PATCH v6 0/6] fsmonitor: option to allow fsmonitor to run against network-mounted repos Jeff Hostetler
2022-09-16 20:02             ` Eric DeCosta
2022-09-16 19:53           ` [PATCH v7 " Eric DeCosta via GitGitGadget
2022-09-16 19:53             ` [PATCH v7 1/6] fsmonitor: refactor filesystem checks to common interface Eric DeCosta via GitGitGadget
2022-09-16 19:53             ` [PATCH v7 2/6] fsmonitor: relocate socket file if .git directory is remote Eric DeCosta via GitGitGadget
2022-09-16 20:11               ` Junio C Hamano
2022-09-19 12:31                 ` Jeff Hostetler
2022-09-19 16:42                   ` Junio C Hamano
2022-09-19 17:08                     ` Jeff Hostetler [this message]
2022-09-19 17:49                       ` Junio C Hamano
2022-09-19 23:51                         ` Eric DeCosta
2022-09-20 14:35                           ` Jeff Hostetler
2022-09-20 15:49                             ` Eric DeCosta
2022-09-16 19:53             ` [PATCH v7 3/6] fsmonitor: avoid socket location check if using hook Eric DeCosta via GitGitGadget
2022-09-16 19:53             ` [PATCH v7 4/6] fsmonitor: deal with synthetic firmlinks on macOS Eric DeCosta via GitGitGadget
2022-09-16 19:53             ` [PATCH v7 5/6] " Eric DeCosta via GitGitGadget
2022-09-16 20:15               ` Junio C Hamano
2022-09-16 19:53             ` [PATCH v7 6/6] fsmonitor: add documentation for allowRemote and socketDir options Eric DeCosta via GitGitGadget
2022-09-16 20:09             ` [PATCH v7 0/6] fsmonitor: option to allow fsmonitor to run against network-mounted repos Junio C Hamano
2022-09-17  1:12             ` [PATCH v8 0/5] " Eric DeCosta via GitGitGadget
2022-09-17  1:12               ` [PATCH v8 1/5] fsmonitor: refactor filesystem checks to common interface Eric DeCosta via GitGitGadget
2022-09-17  1:12               ` [PATCH v8 2/5] fsmonitor: relocate socket file if .git directory is remote Eric DeCosta via GitGitGadget
2022-09-17  4:13                 ` Eric Sunshine
2022-09-19 16:50                   ` Junio C Hamano
2022-09-17  6:29                 ` Eric Sunshine
2022-09-17 16:29                   ` Eric DeCosta
2022-09-19 16:58                   ` Junio C Hamano
2022-09-17  1:12               ` [PATCH v8 3/5] fsmonitor: avoid socket location check if using hook Eric DeCosta via GitGitGadget
2022-09-17  1:12               ` [PATCH v8 4/5] fsmonitor: deal with synthetic firmlinks on macOS Eric DeCosta via GitGitGadget
2022-09-17  1:12               ` [PATCH v8 5/5] fsmonitor: add documentation for allowRemote and socketDir options Eric DeCosta via GitGitGadget
2022-09-17  6:08                 ` Eric Sunshine
2022-09-19 23:55                   ` Eric DeCosta
2022-09-19 19:37               ` [PATCH v9 0/6] fsmonitor: option to allow fsmonitor to run against network-mounted repos Eric DeCosta via GitGitGadget
2022-09-19 19:37                 ` [PATCH v9 1/6] fsmonitor: refactor filesystem checks to common interface Eric DeCosta via GitGitGadget
2022-09-19 19:37                 ` [PATCH v9 2/6] fsmonitor: relocate socket file if .git directory is remote Eric DeCosta via GitGitGadget
2022-09-19 19:57                   ` Eric Sunshine
2022-09-19 19:37                 ` [PATCH v9 3/6] fsmonitor: avoid socket location check if using hook Eric DeCosta via GitGitGadget
2022-09-19 19:37                 ` [PATCH v9 4/6] fsmonitor: deal with synthetic firmlinks on macOS Eric DeCosta via GitGitGadget
2022-09-19 19:37                 ` [PATCH v9 5/6] fsmonitor: check for compatability before communicating with fsmonitor Eric DeCosta via GitGitGadget
2022-09-19 19:37                 ` [PATCH v9 6/6] fsmonitor: add documentation for allowRemote and socketDir options Eric DeCosta via GitGitGadget
2022-09-20 20:33                 ` [PATCH v10 0/6] fsmonitor: option to allow fsmonitor to run against network-mounted repos Eric DeCosta via GitGitGadget
2022-09-20 20:33                   ` [PATCH v10 1/6] fsmonitor: refactor filesystem checks to common interface Eric DeCosta via GitGitGadget
2022-09-20 20:33                   ` [PATCH v10 2/6] fsmonitor: relocate socket file if .git directory is remote Eric DeCosta via GitGitGadget
2022-09-20 20:33                   ` [PATCH v10 3/6] fsmonitor: avoid socket location check if using hook Eric DeCosta via GitGitGadget
2022-09-20 20:33                   ` [PATCH v10 4/6] fsmonitor: deal with synthetic firmlinks on macOS Eric DeCosta via GitGitGadget
2022-09-20 20:33                   ` [PATCH v10 5/6] fsmonitor: check for compatability before communicating with fsmonitor Eric DeCosta via GitGitGadget
2022-09-21 11:22                     ` Jeff Hostetler
2022-09-21 13:03                       ` Eric DeCosta
2022-09-20 20:33                   ` [PATCH v10 6/6] fsmonitor: add documentation for allowRemote and socketDir options Eric DeCosta via GitGitGadget
2022-09-21 22:18                   ` [PATCH v11 0/6] fsmonitor: option to allow fsmonitor to run against network-mounted repos Eric DeCosta via GitGitGadget
2022-09-21 22:18                     ` [PATCH v11 1/6] fsmonitor: refactor filesystem checks to common interface Eric DeCosta via GitGitGadget
2022-09-21 22:18                     ` [PATCH v11 2/6] fsmonitor: relocate socket file if .git directory is remote Eric DeCosta via GitGitGadget
2022-09-21 22:18                     ` [PATCH v11 3/6] fsmonitor: avoid socket location check if using hook Eric DeCosta via GitGitGadget
2022-09-21 22:18                     ` [PATCH v11 4/6] fsmonitor: deal with synthetic firmlinks on macOS Eric DeCosta via GitGitGadget
2022-09-21 22:18                     ` [PATCH v11 5/6] fsmonitor: check for compatability before communicating with fsmonitor Eric DeCosta via GitGitGadget
2022-09-21 22:18                     ` [PATCH v11 6/6] fsmonitor: add documentation for allowRemote and socketDir options Eric DeCosta via GitGitGadget
2022-09-24 19:46                     ` [PATCH v12 0/6] fsmonitor: option to allow fsmonitor to run against network-mounted repos Eric DeCosta via GitGitGadget
2022-09-24 19:46                       ` [PATCH v12 1/6] fsmonitor: refactor filesystem checks to common interface Eric DeCosta via GitGitGadget
2022-09-24 19:46                       ` [PATCH v12 2/6] fsmonitor: relocate socket file if .git directory is remote Eric DeCosta via GitGitGadget
2022-09-24 19:46                       ` [PATCH v12 3/6] fsmonitor: avoid socket location check if using hook Eric DeCosta via GitGitGadget
2022-09-24 19:46                       ` [PATCH v12 4/6] fsmonitor: deal with synthetic firmlinks on macOS Eric DeCosta via GitGitGadget
2022-09-26 15:16                         ` Ævar Arnfjörð Bjarmason
2022-09-27  1:53                           ` Eric DeCosta
2022-09-26 15:27                         ` Ævar Arnfjörð Bjarmason
2022-09-24 19:46                       ` [PATCH v12 5/6] fsmonitor: check for compatability before communicating with fsmonitor Eric DeCosta via GitGitGadget
2022-09-25 14:00                         ` Eric DeCosta
2022-09-26 15:23                         ` Ævar Arnfjörð Bjarmason
2022-09-27  1:25                           ` Eric DeCosta
2022-09-24 19:46                       ` [PATCH v12 6/6] fsmonitor: add documentation for allowRemote and socketDir options Eric DeCosta via GitGitGadget
2022-09-26 15:11                         ` Ævar Arnfjörð Bjarmason
2022-09-27  2:16                           ` Eric Sunshine
2022-09-27  4:03                             ` Eric DeCosta
2022-09-25 14:18                       ` [PATCH v12 0/6] fsmonitor: option to allow fsmonitor to run against network-mounted repos Eric DeCosta
2022-09-27 20:57                       ` [PATCH v13 " Eric DeCosta via GitGitGadget
2022-09-27 20:57                         ` [PATCH v13 1/6] fsmonitor: refactor filesystem checks to common interface Eric DeCosta via GitGitGadget
2022-09-27 20:57                         ` [PATCH v13 2/6] fsmonitor: relocate socket file if .git directory is remote Eric DeCosta via GitGitGadget
2022-09-27 20:57                         ` [PATCH v13 3/6] fsmonitor: avoid socket location check if using hook Eric DeCosta via GitGitGadget
2022-09-27 20:57                         ` [PATCH v13 4/6] fsmonitor: deal with synthetic firmlinks on macOS Eric DeCosta via GitGitGadget
2022-09-28  5:55                           ` Ævar Arnfjörð Bjarmason
2022-09-27 20:57                         ` [PATCH v13 5/6] fsmonitor: check for compatability before communicating with fsmonitor Eric DeCosta via GitGitGadget
2022-09-27 20:57                         ` [PATCH v13 6/6] fsmonitor: add documentation for allowRemote and socketDir options Eric DeCosta via GitGitGadget
2022-09-28 20:12                         ` [PATCH v14 0/6] fsmonitor: option to allow fsmonitor to run against network-mounted repos Eric DeCosta via GitGitGadget
2022-09-28 20:12                           ` [PATCH v14 1/6] fsmonitor: refactor filesystem checks to common interface Eric DeCosta via GitGitGadget
2022-09-28 20:12                           ` [PATCH v14 2/6] fsmonitor: relocate socket file if .git directory is remote Eric DeCosta via GitGitGadget
2022-09-28 20:12                           ` [PATCH v14 3/6] fsmonitor: avoid socket location check if using hook Eric DeCosta via GitGitGadget
2022-09-28 20:12                           ` [PATCH v14 4/6] fsmonitor: deal with synthetic firmlinks on macOS Eric DeCosta via GitGitGadget
2022-09-28 20:12                           ` [PATCH v14 5/6] fsmonitor: check for compatability before communicating with fsmonitor Eric DeCosta via GitGitGadget
2022-09-28 20:12                           ` [PATCH v14 6/6] fsmonitor: add documentation for allowRemote and socketDir options Eric DeCosta via GitGitGadget
2022-10-04 17:32                           ` [PATCH v15 0/6] fsmonitor: option to allow fsmonitor to run against network-mounted repos Eric DeCosta via GitGitGadget
2022-10-04 17:32                             ` [PATCH v15 1/6] fsmonitor: refactor filesystem checks to common interface Eric DeCosta via GitGitGadget
2023-01-30  9:37                               ` Ævar Arnfjörð Bjarmason
2022-10-04 17:32                             ` [PATCH v15 2/6] fsmonitor: relocate socket file if .git directory is remote Eric DeCosta via GitGitGadget
2023-01-30  9:58                               ` Ævar Arnfjörð Bjarmason
2022-10-04 17:32                             ` [PATCH v15 3/6] fsmonitor: avoid socket location check if using hook Eric DeCosta via GitGitGadget
2022-10-04 17:32                             ` [PATCH v15 4/6] fsmonitor: deal with synthetic firmlinks on macOS Eric DeCosta via GitGitGadget
2023-01-30 10:08                               ` Ævar Arnfjörð Bjarmason
2022-10-04 17:32                             ` [PATCH v15 5/6] fsmonitor: check for compatability before communicating with fsmonitor Eric DeCosta via GitGitGadget
2022-10-04 17:32                             ` [PATCH v15 6/6] fsmonitor: add documentation for allowRemote and socketDir options Eric DeCosta via GitGitGadget
2023-01-30 10:04                               ` Ævar Arnfjörð Bjarmason
2022-10-05 18:05                             ` [PATCH v15 0/6] fsmonitor: option to allow fsmonitor to run against network-mounted repos Junio C Hamano
2022-10-05 21:14                               ` Eric DeCosta

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