can't modify another derivation, they are read-only

error: build of '/nix/store/d3n235cb5shqdj3p5k937mb84fn7pd8k-tabnine-3.1.1.drv' on 'ssh://build' failed: builder for '/nix/store/d3n235cb5shqdj3p5k937mb84fn7pd8k-tabnine-3.1.1.drv' failed with exit code 1
builder for '/nix/store/d3n235cb5shqdj3p5k937mb84fn7pd8k-tabnine-3.1.1.drv' failed with exit code 1; last 6 log lines:
  patching sources
  configuring
  no configure script, doing nothing
  installing
  chmod: changing permissions of '/nix/store/0l29blcimkb75b87r1xqlri6sqba198p-TabNine': Operation not permitted
  builder for '/nix/store/d3n235cb5shqdj3p5k937mb84fn7pd8k-tabnine-3.1.1.drv' failed with exit code 1

please build the package

weird it works for me in both darwin and linux.
and nixpkgs-review also reports succesful build.

Result of nixpkgs-review pr 99312 1

@GrahamcOfBorg build tabnine

also, this doesn't work for darwin. It's just "succeeding" due to how fixed-output-derivations work

Maybe it's something with my local nix setup, but it not just builds but correctly works on my machine (TabNine binary works as well as tabnine completion inside vim).

do you use a mac or linux?

do you use a mac or linux?

I use mac with nix and also checked on debian with nix.

it worked on both machines even before replacing chmod+ln with cp+chmod

your nix-store should be read-only. chmod'ing another store path should fail

That's for package version which does chmod $src and then ln -s on macos:

❯ nix-build ~/dev/os/nixpkgs -A tabnine
/nix/store/d7mc493ywdfq7acz5wd8papf5wsacnxl-tabnine-3.1.1
❯ ls -l $(readlink ./result/bin/TabNine)
-r-xr-xr-x  1 wb  admin  12051528 Jan  1  1970 /nix/store/mkmysfrisxwz4dvl5cgyh4yrlcg05cm8-TabNine

onsails@7e9dc15
https://github.com/onsails/nixpkgs/blob/fix-tabnine-chmod/pkgs/development/tools/tabnine/default.nix

That's the same on debian with nix:

❯ nix-build ~/dev/os/nixpkgs -A tabnine
/nix/store/zv71q7nx41x7l83lc8vll4ga844vaa22-tabnine-3.1.1
❯ ls -l $(realpath ./result/bin/TabNine)
-r-xr-xr-x 1 wb wb 15837160 Jan  1  1970 /nix/store/0l29blcimkb75b87r1xqlri6sqba198p-TabNine

Perhaps nix store is read-only on NixOS only.

@GrahamcOfBorg build tabnine

Perhaps nix store is read-only on NixOS only.

This likely means that you're not using a sandbox, and nixos by default will use a sandbox.

Either way, going to close in favor of #99310

I brought over the fixes for darwin