nix-super/tests/lang/eval-okay-readFileType.nix at 2cabf85b533694286ead5bc26f31b609adeab73b - max/nix-super - The Forge

max/nix-super

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Alex Ameen 153ee460c5 primop: add readFileType, optimize readDir

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`.

2023-01-22 13:45:02 -06:00

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 {
   bar    = builtins.readFileType ./readDir/bar;
   foo    = builtins.readFileType ./readDir/foo;
   linked = builtins.readFileType ./readDir/linked;
   ldir   = builtins.readFileType ./readDir/ldir;
 }