Fix the detection of already built drv outputs #4378
Merged
+78
−53
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PRs #4370 and #4348 had a bad interaction in that the second broke the fist
one in a not trivial way.
The issue was that since #4348 the logic for detecting whether a
derivation output is already built requires some logic that was specific
to the
LocalStore
.It happens though that most of this logic could be upstreamed to any
Store
,which is what this commit does.