Better detect when buildPaths
would be a no-op
#4370
Merged
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buildPaths
can be called even for stores where it's not defined in case it'sbound to be a no-op.
The “no-op detection” mechanism was only detecting the case wher
buildPaths
was called on a set of (non-drv) paths that were already present on the store.
This commit extends this mechanism to also detect the case where
buildPaths
is called on a set of derivation outputs which are already built on the store.
This only works with the ca-derivations flag. It could be possible to
extend this to also work without it, but it would add quite a bit of
complexity, and it's not used without it anyways.