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nix copy fully evaluates installable argument (and build/substitutes it into the local store) before validating that --from or --to are present #687

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opened 2025-02-21 16:28:32 +00:00 by lunaphied · 1 comment
lunaphied commented 2025-02-21 16:28:32 +00:00
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This causes pointless wastes of time for users that haven't correctly input the command

This causes pointless wastes of time for users that haven't correctly input the command
gilice commented 2025-02-28 17:40:00 +00:00
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I worked a bit on this bug, I don't have the fix, but here is a reproducer:

{
  pkgs ? import <nixpkgs> {}
}:
derivation {
  name = "hello";
  builder = "/bin/sh";
  system = builtins.currentSystem;
  args = [
    "-c"
    "${pkgs.coreutils}/bin/sleep 100000 && echo hello > $out"
  ];
}

then nix copy --file reproduce.nix will be enough to trigger this behaviour.

From my (naive) understanding of the code, the issue seems to be that

I do not know a good way to fix this.
The inheritance monster has the last laugh again.

I worked a bit on this bug, I don't have the fix, but here is a reproducer: ```nix { pkgs ? import <nixpkgs> {} }: derivation { name = "hello"; builder = "/bin/sh"; system = builtins.currentSystem; args = [ "-c" "${pkgs.coreutils}/bin/sleep 100000 && echo hello > $out" ]; } ``` then `nix copy --file reproduce.nix` will be enough to trigger this behaviour. From my (naive) understanding of the code, the issue seems to be that * [`CmdCopy`](https://git.lix.systems/lix-project/lix/src/commit/708f1ea34257c81bed3f161f2547bb898f5479a8/lix/nix/copy.cc#L7) is a [`BuiltPathsCommand`](https://git.lix.systems/lix-project/lix/src/commit/708f1ea34257c81bed3f161f2547bb898f5479a8/lix/libcmd/command.cc#L128), * which will in turn call [`Installable::toBuiltPaths`](https://git.lix.systems/lix-project/lix/src/commit/708f1ea34257c81bed3f161f2547bb898f5479a8/lix/libcmd/installables.cc#L703) [in its own `run()`](https://git.lix.systems/lix-project/lix/src/commit/708f1ea34257c81bed3f161f2547bb898f5479a8/lix/libcmd/command.cc#L165) * which calls `Installable::build` * and this all runs before `CopyCmd` can ever validate its own arguments in [`CopyCommand::getDstStore`](https://git.lix.systems/lix-project/lix/src/commit/708f1ea34257c81bed3f161f2547bb898f5479a8/lix/libcmd/command.cc#L74). I do not know a good way to fix this. The inheritance monster has the last laugh again.
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Reference: lix-project/lix#687
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