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git-status.txt: mention --no-optional-locks

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If you come to the documentation thinking "I do not want Git
to take any locks for my background processes", then you may
easily run across "--no-optional-locks" in git.txt.

But it's quite reasonable to hit a specific instance of the
problem: you have "git status" running in the background,
and you notice that it causes lock contention with other
processes. So you look in git-status.txt to see if there is
a way to disable it, but there's no mention of the flag.

Let's add a short note mentioning that status does indeed
touch the index (and why), with a pointer to the global
option. That can point users in the right direction and help
them make a more informed decision about what they're
disabling.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2017-11-27 01:04:12 -05:00 committed by Junio C Hamano
parent 27344d6a6c
commit 5e83cca0b8
1 changed files with 13 additions and 0 deletions
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Documentation/git-status.txt
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@ -366,6 +366,19 @@ ignored submodules you can either use the --ignore-submodules=dirty command
line option or the 'git submodule summary' command, which shows a similar
output but does not honor these settings.
BACKGROUND REFRESH
------------------
By default, `git status` will automatically refresh the index, updating
the cached stat information from the working tree and writing out the
result. Writing out the updated index is an optimization that isn't
strictly necessary (`status` computes the values for itself, but writing
them out is just to save subsequent programs from repeating our
computation). When `status` is run in the background, the lock held
during the write may conflict with other simultaneous processes, causing
them to fail. Scripts running `status` in the background should consider
using `git --no-optional-locks status` (see linkgit:git[1] for details).
SEE ALSO
--------
linkgit:gitignore[5]