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print type and value in "flake attr is not a derivation" errors

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This turns errors like:

error: flake output attribute 'hydraJobs' is not a derivation or path

into errors like:

error: expected flake output attribute 'hydraJobs' to be a derivation or
path but found a set: { binaryTarball = «thunk»; build = «thunk»; etc> }

This change affects all InstallableFlake commands.

Source: 20981461d4
Signed-off-by: Jörg Thalheim <joerg@thalheim.io>
This commit is contained in:
Qyriad 2024-05-21 05:29:52 -06:00 committed by Valentin Gagarin
parent e2182d07d9
commit 18ac6545fc
2 changed files with 25 additions and 2 deletions
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18
doc/manual/rl-next/print-value-in-installable-flake-error.md Normal file
View file

@ -0,0 +1,18 @@
---
synopsis: New-cli flake commands that expect derivations now print the failing value and its type
prs: 10778
---
In errors like `flake output attribute 'nixosConfigurations.yuki.config' is not a derivation or path`, the message now includes the failing value and type.
Before:
```
error: flake output attribute 'nixosConfigurations.yuki.config' is not a derivation or path
````
After:
```
error: expected flake output attribute 'nixosConfigurations.yuki.config' to be a derivation or path but found a set: { appstream = «thunk»; assertions = «thunk»; boot = { bcache = «thunk»; binfmt = «thunk»; binfmtMiscRegistrations = «thunk»; blacklistedKernelModules = «thunk»; bootMount = «thunk»; bootspec = «thunk»; cleanTmpDir = «thunk»; consoleLogLevel = «thunk»; «43 attributes elided» }; «48 attributes elided» }
```

9
src/libcmd/installable-flake.cc
View file

@ -106,9 +106,14 @@ DerivedPathsWithInfo InstallableFlake::toDerivedPaths()
fmt("while evaluating the flake output attribute '%s'", attrPath)))
{
return { *derivedPathWithInfo };
} else {
throw Error(
"expected flake output attribute '%s' to be a derivation or path but found %s: %s",
attrPath,
showType(v),
ValuePrinter(*this->state, v, errorPrintOptions)
);
}
else
throw Error("flake output attribute '%s' is not a derivation or path", attrPath);
}
auto drvPath = attr->forceDerivation();