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No global eval settings in libnixexpr#10913

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roberth merged 1 commit intomasterfrom
no-global-eval-settings-in-libexpr
Jun 24, 2024
Merged

No global eval settings in libnixexpr#10913
roberth merged 1 commit intomasterfrom
no-global-eval-settings-in-libexpr

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@Ericson2314
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Motivation

Progress on #5638

Context

There is still a global eval settings, but it pushed down into libnixcmd, which is a lot less bad a place for this sort of thing.

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@github-actions github-actions bot added new-cli Relating to the "nix" command repl The Read Eval Print Loop, "nix repl" command and debugger c api Nix as a C library with a stable interface labels Jun 14, 2024
@Ericson2314 Ericson2314 force-pushed the no-global-eval-settings-in-libexpr branch from fab536d to df54688 Compare June 14, 2024 17:35
@edolstra
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Is there a use case where we could have multiple EvalState instances with different settings?

@Ericson2314
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Ericson2314 commented Jun 17, 2024

@edolstra Evaluating completely independent things. Could be part of an application with a long-lived process, or it could be part of the unit tests. The latter one may be just testing, but it's a fully non-hypothetical real one today.

@Ericson2314 Ericson2314 marked this pull request as ready for review June 17, 2024 19:44
@Ericson2314 Ericson2314 force-pushed the no-global-eval-settings-in-libexpr branch from df54688 to 4fd6441 Compare June 24, 2024 14:21
Progress on #5638

There is still a global eval settings, but it pushed down into
`libnixcmd`, which is a lot less bad a place for this sort of thing.
@Ericson2314 Ericson2314 force-pushed the no-global-eval-settings-in-libexpr branch from 4fd6441 to 52bfccf Compare June 24, 2024 16:17
@Ericson2314 Ericson2314 requested a review from thufschmitt as a code owner June 24, 2024 16:17
@github-actions github-actions bot added with-tests Issues related to testing. PRs with tests have some priority fetching Networking with the outside (non-Nix) world, input locking labels Jun 24, 2024
@roberth roberth merged commit c66f1e7 into master Jun 24, 2024
@roberth roberth deleted the no-global-eval-settings-in-libexpr branch June 24, 2024 16:52
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This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/2024-06-24-nix-team-meeting-minutes-155/47739/1

Comment on lines +110 to +112
void * p = ::operator new(
sizeof(EvalState),
static_cast<std::align_val_t>(alignof(EvalState)));
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This is causing problems for 24.05.
Might a simpler solution be feasible?

https://github.com/NixOS/nixpkgs/pull/324408/checks?check_run_id=27026504754

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c api Nix as a C library with a stable interface fetching Networking with the outside (non-Nix) world, input locking new-cli Relating to the "nix" command repl The Read Eval Print Loop, "nix repl" command and debugger with-tests Issues related to testing. PRs with tests have some priority

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4 participants