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Re: Some rough edges of core.fsmonitor

From
Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Date
Jan 28, 2018, 22:28 UTC
Message-ID
<CACBZZX74WcK4qX5O1E_6nxv7f4Vpns3O-7dcURbs+QneKsA87Q@mail.gmail.com>
In-Reply-To
<nycvar.QRO.7.76.6.1801282140330.35@ZVAVAG-6OXH6DA.rhebcr.pbec.zvpebfbsg.pbz>

On Sun, Jan 28, 2018 at 9:44 PM, Johannes Schindelin <Johannes.Schindelin@gmx.de> wrote:

Show 37 quoted lines
> Hi,
>
> On Sat, 27 Jan 2018, Ævar Arnfjörð Bjarmason wrote:
>
>> I just got around to testing this since it landed, for context some
>> previous poking of mine in [1].
>>
>> Issues / stuff I've noticed:
>>
>> 1) We end up invalidating the untracked cache because stuff in .git/
>> changed. For example:
>>
>>     01:09:24.975524 fsmonitor.c:173         fsmonitor process '.git/hooks/fsmonitor-watchman' returned success
>>     01:09:24.975548 fsmonitor.c:138         fsmonitor_refresh_callback '.git'
>>     01:09:24.975556 fsmonitor.c:138         fsmonitor_refresh_callback '.git/config'
>>     01:09:24.975568 fsmonitor.c:138         fsmonitor_refresh_callback '.git/index'
>>     01:09:25.122726 fsmonitor.c:91          write fsmonitor extension successful
>>
>> Am I missing something or should we do something like:
>>
>>     diff --git a/fsmonitor.c b/fsmonitor.c
>>     index 0af7c4edba..5067b89bda 100644
>>     --- a/fsmonitor.c
>>     +++ b/fsmonitor.c
>>     @@ -118,7 +118,12 @@ static int query_fsmonitor(int version, uint64_t last_update, struct strbuf *que
>>
>>      static void fsmonitor_refresh_callback(struct index_state *istate, const char *name)
>>      {
>>     -       int pos = index_name_pos(istate, name, strlen(name));
>>     +       int pos;
>>     +
>>     +       if (!strcmp(name, ".git") || starts_with(name, ".git/"))
>>     +               return;
>>     +
>>     +       pos = index_name_pos(istate, name, strlen(name));
>
> I would much rather have the fsmonitor hook already exclude those.

As documented the fsmonitor-watchman hook we ship doesn't work as described in githooks(5), unless "files in the working directory" is taken to include .git/, but I haven't seen that ever used.

On the other hand relying on arbitrary user-provided hooks to do the right thing at the cost of silent performance degradation is bad. If we're going to expect the hook to remove these we should probably warn/die here if it does send us .git/* files.

> If you *must* add these comparisons, you have to use fspathcmp() and
> fspathncmp() instead (because case-insensitivity).
Thanks.
Previous: Johannes SchindelinNext: Ben Peart
Message 15 of 30 in “Some rough edges of core.fsmonitor”
  1. Ævar Arnfjörð BjarmasonJan 27, 2018
  2. Duy NguyenJan 27, 2018
  3. trace: measure where the time is spent in the index-heavy operationsNguyễn Thái Ngọc Duy, Jan 27, 2018
  4. Thomas GummererJan 27, 2018
  5. trace: measure where the time is spent in the index-heavy operationsNguyễn Thái Ngọc Duy, Jan 27, 2018
  6. Ævar Arnfjörð BjarmasonJan 27, 2018
  7. Duy NguyenJan 27, 2018
  8. Duy NguyenJan 27, 2018
  9. Ævar Arnfjörð BjarmasonJan 27, 2018
  10. Ben PeartJan 30, 2018
  11. Duy NguyenJan 29, 2018
  12. Ben PeartJan 29, 2018
  13. Duy NguyenFeb 1, 2018
  14. Johannes SchindelinJan 28, 2018
  15. Ævar Arnfjörð BjarmasonJan 28, 2018
  16. Ben PeartJan 30, 2018
  17. Duy NguyenJan 31, 2018
  18. dir.c: ignore paths containing .git when invalidating untracked cacheNguyễn Thái Ngọc Duy, Feb 4, 2018
  19. Ben PeartFeb 5, 2018
  20. Duy NguyenFeb 6, 2018
  21. dir.c: ignore paths containing .git when invalidating untracked cacheNguyễn Thái Ngọc Duy, Feb 7, 2018
  22. dir.c: ignore paths containing .git when invalidating untracked cacheNguyễn Thái Ngọc Duy, Feb 7, 2018
  23. Ben PeartFeb 7, 2018
  24. Duy NguyenFeb 13, 2018
  25. Junio C HamanoFeb 13, 2018
  26. Duy NguyenFeb 14, 2018
  27. Junio C HamanoFeb 14, 2018
  28. Ben PeartJan 30, 2018
  29. Ævar Arnfjörð BjarmasonJan 30, 2018
  30. Ben PeartJan 31, 2018

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