Detect implicit cabal cradle in the absence of cabal.project #221
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When would the implicit stack cradle be selected with this logic? |
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Always selected first, if possible. Cabal cradles are the “last resort” in the implicit lookup and this only extends the Cabal part |
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A cabal cradle doesn't need a cabal.project file and isn't guaranteed to have one either. This improves the implicit cradle search for cabal by falling back to finding .cabal files if hie-bios couldn't find any cabal.project files. Because it falls back, if hie-bios tries to query a multi-package cabal project with a nested cabal package, it will still find use the "larger" cradle with the upper cabal.project file. See the implicit-cabal-deep-project test project for an example of this.
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| @@ -32,7 +32,7 @@ jobs: | |||
| key: ${{ runner.OS }}-${{ matrix.ghc }}-cabal-0 | |||
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| - name: Run ShellCheck | |||
| uses: ludeeus/action-shellcheck@master | |||
| uses: ludeeus/action-shellcheck@2f2aa0d | |||
| -- don't spin up a ghc session, just run the opts program manually since | ||
| -- we're not guaranteed to be able to get the ghc libdir if the cradle is | ||
| -- failing |
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That is interesting and not documented: https://github.com/mpickering/hie-bios/blob/master/src/HIE/Bios/Types.hs#L60
Or what do you mean with this?
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Now that hie-bios no longer uses ghc-paths it has to call cabal exec ghc for the failing-cabal test case to set up the ghc session. But cabal exec ghc fails because it can’t resolve the constraints in the first place! So we aren’t able to get a lib dir. Prior to this it was just working by fluke, since there’s no cabal.project in this directory cabal exec ghc was using the hie-bios project to resolve it fine.
We can still test loading the flags etc and it will still fail, we just need to do it without a ghc session
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Maybe we should document it better that we require runCradle to succeed and how the results for libdir may be non-sensical if it fails?
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@fendor let's remove them when we revert the stop files commit |
This prevents the cabal.project/hie.yaml of hie-bios's source tree from interfering with the cradle stuff
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A cabal cradle doesn't need a cabal.project file and isn't guaranteed to have one either. This improves the implicit cradle search for cabal by falling back to finding .cabal files if hie-bios couldn't find any cabal.project files.
Because it falls back, if hie-bios tries to query a multi-package cabal project with a nested cabal package, it will still find use the "larger" cradle with the upper cabal.project file. See the implicit-cabal-deep-project test project for an example of this.