this derivation will be built:
  /nix/store/223l31qfjj63na92vg7ws5fghdndl27k-nix-shell.drv
this path will be fetched (5.8 MiB download, 18.5 MiB unpacked):
  /nix/store/rl3j1za9dpdri1vr52vl69y1qczjb5zv-rustfmt-1.97.1
building '/nix/store/223l31qfjj63na92vg7ws5fghdndl27k-nix-shell.drv' on 'ssh-ng://nix-remote-builder@bld3.m.ntd.one'
building '/nix/store/223l31qfjj63na92vg7ws5fghdndl27k-nix-shell.drv'
nix-shell> Running phase: buildPhase

post-build step Upload to niks3: ok
time=2026-08-31T15:54:16.014Z level=INFO msg="Uploading 6 paths to niks3.numtide.com (96 already cached)"
time=2026-08-31T15:54:16.014Z level=INFO msg="Uploading rl3j1za9dpdri1vr52vl69y1qczjb5zv-rustfmt-1.97.1 (18.5MB)"
time=2026-08-31T15:54:16.049Z level=INFO msg="Uploading z64fp7fjfy9zr3xn7prdidi4gww213d5-cargo-1.97.1 (37.5MB)"
time=2026-08-31T15:54:16.051Z level=INFO msg="Uploading 8w6p0mvqs1zg94dwp09gan17f2pfwig4-rustc-1.97.1 (1.0GB)"
time=2026-08-31T15:54:16.052Z level=INFO msg="Uploading y6v5c5bb5drnvyf3jgm4qkkyihnfjwhj-clippy-1.97.1 (22.4MB)"
time=2026-08-31T15:54:16.015Z level=INFO msg="Uploading w71sf9xjmv4cpbcrdyrqpk15a80ra26s-nix-shell (7.4KB)"
time=2026-08-31T15:54:16.054Z level=INFO msg="Uploading d6bnbpk6jr95frzmmksda4r7l3v8d3m6-rustc-wrapper-1.97.1 (3.3KB)"
time=2026-08-31T15:54:26.344Z level=ERROR msg="Failed to close zstd encoder" error="io: read/write on closed pipe"
time=2026-08-31T15:56:44.048Z level=ERROR msg="Failed to close zstd encoder" error="io: read/write on closed pipe"
time=2026-08-31T15:56:44.053Z level=INFO msg="Uploading 6 narinfos"
time=2026-08-31T15:56:44.670Z level=INFO msg="Upload complete. (2m31.328s)"