Sergei Zimmerman c5c05e44b3 Make nix nar cat work on pipes too ...

This was lost after 2.32 while making the accessor lazy. We can restore the support
for it pretty easily. Also this is significant optimization for nix nar cat.
E.g. with a NAR of a linux repo this speeds up by ~3x:

Benchmark 1: nix nar cat /tmp/linux.nar README
  Time (mean ± σ):     737.2 ms ±   5.6 ms    [User: 298.1 ms, System: 435.7 ms]
  Range (min … max):   728.6 ms … 746.9 ms    10 runs

Benchmark 2: build/src/nix/nix nar cat /tmp/linux.nar README
  Time (mean ± σ):     253.5 ms ±   2.9 ms    [User: 56.4 ms, System: 196.3 ms]
  Range (min … max):   248.1 ms … 258.7 ms    12 runs

2025-12-08 03:26:03 +03:00

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