Fix using /nix/store paths in cabal.project #1978
Merged
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This change makes sure paths have a context so they will be included in the derivation inputs for the component derivations. Without this sandbox builds cannot see the input and fail with the error:
do not know how to unpack source archive /nix/store/...
This PR also fixes an issue if project src has no cabal files and is not the root directory of the repo.