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fsmonitor: check the untracked cache after a trivial response - #2247

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k15tfu wants to merge 1 commit into
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k15tfu:untracked-cache-trivial-response
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k15tfu:untracked-cache-trivial-response

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@k15tfu k15tfu commented Oct 3, 2026

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gitgitgadget Bot commented Oct 3, 2026

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@gitgitgadget gitgitgadget Bot added the new user label Oct 3, 2026
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gitgitgadget Bot commented Oct 3, 2026

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There is an issue in commit 357db73:
fsmonitor: check the untracked cache after a trivial response

  • Commit not signed off

@k15tfu
k15tfu force-pushed the untracked-cache-trivial-response branch from 357db73 to 24661d5 Compare October 3, 2026 14:02
@k15tfu
k15tfu marked this pull request as draft October 3, 2026 14:03
@k15tfu
k15tfu marked this pull request as ready for review October 3, 2026 14:04
@k15tfu
k15tfu force-pushed the untracked-cache-trivial-response branch 2 times, most recently from 1b6787c to d83dfca Compare October 3, 2026 14:10
@k15tfu
k15tfu marked this pull request as draft October 3, 2026 15:54
@k15tfu
k15tfu marked this pull request as ready for review October 3, 2026 15:54
When the monitor sends a trivial response ("/"), for example after
the daemon restarted or lost events, refresh_fsmonitor() marks every
index entry dirty, which is saved in the index. For the untracked
cache it only clears the in-memory flag use_fsmonitor. The valid bits
of the cached directories are saved unchanged, although nothing
checks them anymore: valid_cached_dir() does not lstat() a valid
directory while the monitor is trusted.

A command that does not scan for untracked files, like "git add" or
"git checkout", therefore saves the new token next to stale valid
bits, and every later "git status" trusts them. A directory removed
in the meantime keeps its untracked files listed, or, when its own
entry is invalid, makes every run print
```
warning: could not open directory 'sub/': No such file or directory
```
Check every cached directory against its stat data before the cache
is saved next to such a token, as valid_cached_dir() does without a
monitor, and invalidate the ones that changed or disappeared. Doing
this at write time skips commands that do not write the index, and
sparse index writes, which drop the fsmonitor extension anyway.
The cost is one lstat() per cached directory, once per trivial
response.

Signed-off-by: Ilia K <ki.stfu@gmail.com>
@k15tfu
k15tfu force-pushed the untracked-cache-trivial-response branch from d83dfca to 84618b8 Compare October 3, 2026 15:55
@k15tfu

k15tfu commented Oct 3, 2026

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/allow

@gitgitgadget

gitgitgadget Bot commented Oct 3, 2026

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Error: User k15tfu is not yet permitted to use GitGitGadget

@k15tfu

k15tfu commented Oct 3, 2026

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/preview

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Error: User k15tfu is not yet permitted to use GitGitGadget

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