`allowSubstitutes` causing a derivation to fail to build is not exposed to the user #484

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opened 2024-08-22 23:30:09 +00:00 by jade · 1 comment

jade commented

2024-08-22 23:30:09 +00:00

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building of '/nix/store/7s3fi53i1659dack0xp6ca8kmcs435ia-nixpkgs-patched.drv^out' from .drv file: goal destroyed
error:
       … while calling the 'head' builtin
         at /mnt/nix/store/1nf4pp7gw1zsc44j1pq7wn8kznsmx6pn-source/lib/attrsets.nix:1575:11:
         1574|         || pred here (elemAt values 1) (head values) then
         1575|           head values
             |           ^
         1576|         else

       … while evaluating the attribute 'value'
         at /mnt/nix/store/1nf4pp7gw1zsc44j1pq7wn8kznsmx6pn-source/lib/modules.nix:821:9:
          820|     in warnDeprecation opt //
          821|       { value = addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          822|         inherit (res.defsFinal') highestPrio;

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: a 'x86_64-linux' with features {} is required to build '/nix/store/7s3fi53i1659dack0xp6ca8kmcs435ia-nixpkgs-patched.drv', but I am a 'aarch64-linux' with features {benchmark, big-parallel, gccarch-armv8-a, kvm, nixos-test}

Observe that nowhere in this error message did it say it didn't try to substitute it because it was not allowed to. It did not even say that in the debug logs.

To cause yourself similar suffering, build a derivation that has a system that the local machine doesn't know how to build, but is available in a substituter and has allowSubstitutes = false.

A large amount of everyone's time was wasted debugging why a derivation was not substituting and was simply failing to build: https://matrix.to/#/!9IQChSjwSHXPPWTa:lix.systems/$IFHqKIPVzrnA-fGKiAWKE0QTCkcJ1WWqeU1DLKqr3F8?via=lix.systems&via=matrix.org&via=catgirl.cloud ``` building of '/nix/store/7s3fi53i1659dack0xp6ca8kmcs435ia-nixpkgs-patched.drv^out' from .drv file: goal destroyed error: … while calling the 'head' builtin at /mnt/nix/store/1nf4pp7gw1zsc44j1pq7wn8kznsmx6pn-source/lib/attrsets.nix:1575:11: 1574| || pred here (elemAt values 1) (head values) then 1575| head values | ^ 1576| else … while evaluating the attribute 'value' at /mnt/nix/store/1nf4pp7gw1zsc44j1pq7wn8kznsmx6pn-source/lib/modules.nix:821:9: 820| in warnDeprecation opt // 821| { value = addErrorContext "while evaluating the option `${showOption loc}':" value; | ^ 822| inherit (res.defsFinal') highestPrio; (stack trace truncated; use '--show-trace' to show the full trace) error: a 'x86_64-linux' with features {} is required to build '/nix/store/7s3fi53i1659dack0xp6ca8kmcs435ia-nixpkgs-patched.drv', but I am a 'aarch64-linux' with features {benchmark, big-parallel, gccarch-armv8-a, kvm, nixos-test} ``` Observe that nowhere in this error message did it say it didn't try to substitute it because it was not allowed to. It did not even say that in the debug logs. To cause yourself similar suffering, build a derivation that has a system that the local machine doesn't know how to build, but is available in a substituter and has `allowSubstitutes = false`.

jade added the

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2024-08-22 23:30:09 +00:00

jade self-assigned this

2024-08-23 00:08:11 +00:00

lix-bot commented

2024-08-23 00:12:17 +00:00

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This issue was mentioned on Gerrit on the following CLs:

commit message in cl/1841 ("fix: good errors for failures caused by allowSubstitutes")

This issue was mentioned on Gerrit on the following CLs: * commit message in [cl/1841](https://gerrit.lix.systems/c/lix/+/1841) ("fix: good errors for failures caused by allowSubstitutes")