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primop: add readFileType, optimize readDir

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Allows checking directory entry type of a single file/directory.

This was added to optimize the use of `builtins.readDir` on some
filesystems and operating systems which cannot detect this information
using POSIX's `readdir`.

Previously `builtins.readDir` would eagerly use system calls to lookup
these filetypes using other interfaces; this change makes these
operations lazy in the attribute values for each file with application
of `builtins.readFileType`.
This commit is contained in:
Alex Ameen 2023-01-22 13:45:02 -06:00
parent 04de0dd0b4
commit 153ee460c5
7 changed files with 75 additions and 8 deletions
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foo/git-hates-directories