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Misc file system fixes, especially for windows#15301

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Ericson2314 merged 7 commits intoNixOS:masterfrom
obsidiansystems:file-system-prep
Feb 20, 2026
Merged

Misc file system fixes, especially for windows#15301
Ericson2314 merged 7 commits intoNixOS:masterfrom
obsidiansystems:file-system-prep

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@amaanq amaanq commented Feb 20, 2026

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Ericson2314 and others added 7 commits February 19, 2026 17:21
Add FS_ROOT_NO_TRAILING_SLASH macro and update isInDir and isDirOrInDir tests to use FS_ROOT and FS_SEP macros for cross-platform compatibility.
It doesn't do anything on Windows, it appears.
Make sure we're testing non-directory roots.
 This indicates that they are returning an owned handle (i.e. the caller
 should --- and will, thanks to RAII --- close it).

 `ntOpenAt` and friends (internal) also use `AutoCloseFD` for the same
 reason.
`AutoCloseFD::fsync()` contained platform-specific logic behind CPP
guards. This extracts it into a free function `syncDescriptor(Descriptor)`
with separate Unix and Windows implementations, and makes
`AutoCloseFD::fsync()` an inline wrapper that delegates to it. The
Windows implementation uses `FlushFileBuffers` (returns `BOOL`, true on
success) while Unix uses `::fsync` (or `F_FULLFSYNC` on macOS), so
splitting them avoids conflating the two calling conventions.
The new signature is:
  writeFile(Descriptor fd, std::string_view s, FsSync sync = FsSync::No, const Path * origPath = nullptr)

This uses `descriptorToPath` if `origPath` is not provided.
@Ericson2314 Ericson2314 changed the title file system prep Misc file system fixes, especially for windows Feb 20, 2026
@Ericson2314 Ericson2314 added this pull request to the merge queue Feb 20, 2026
Merged via the queue into NixOS:master with commit 5c1939e Feb 20, 2026
15 checks passed
@Ericson2314 Ericson2314 deleted the file-system-prep branch February 20, 2026 02:19
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2 participants