allowSubstitutes
causing a derivation to fail to build is not exposed to the user #484
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Reference: lix-project/lix#484
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Delete branch "%!s()"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
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
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
.This issue was mentioned on Gerrit on the following CLs: