Error loading a project with `build-type: custom` (f.e. cabal-install)

[flip111]

2020-02-04 19:52:42.9639947 [ThreadId 3] - ---> {"jsonrpc":"2.0","id":394,"method":"textDocument/references","params":{"textDocument":{"uri":"file:///c%3A/Users/flip111/haskell/cabal/cabal-install/Distribution/Client/ProjectPlanning.hs"},"position":{"line":1416,"character":16},"context":{"includeDeclaration":true}}}
2020-02-04 19:52:42.9639947 [ThreadId 25] - ****** reactor: got message number:461
2020-02-04 19:52:42.9639947 [ThreadId 25] - reactor:got FindReferences:RequestMessage {_jsonrpc = "2.0", _id = IdInt 394, _method = TextDocumentReferences, _params = ReferenceParams {_textDocument = TextDocumentIdentifier {_uri = Uri {getUri = "file:///c%3A/Users/flip111/haskell/cabal/cabal-install/Distribution/Client/ProjectPlanning.hs"}}, _position = Position {_line = 1416, _character = 16}, _context = ReferenceContext {_includeDeclaration = True}, _workDoneToken = Nothing}}
2020-02-04 19:52:42.9639947 [ThreadId 25] - ****** reactor: top of loop
2020-02-04 19:52:42.9639947 [ThreadId 31] - ideDispatcher: got request 461 with id: IdInt 394
2020-02-04 19:52:42.9649911 [ThreadId 31] - ideDispatcher: top of loop

https://github.com/haskell/cabal/blob/ac84fa2f25505ed604769d6fc3f00ecf3933b248/cabal-install/Distribution/Client/ProjectPlanning.hs#L1417

[fendor]

Maybe project failed to load? Are hover requests working?

[flip111]

I restarted vs code (the editor that i'm using) seems that this issue is first stuck on another issue

Fail on initialisation for "C:\Users\flip111\haskell\cabal\cabal-install\Distribution\Client\ProjectPlanning.hs". Could not obtain flags for: "Distribution\Client\ProjectPlanning.hs".

projectplanning_hie_log.txt

Or maybe it's the same issue but another manifestation of it.

[fendor]

there should be a diagnostic in the first line with more infos

[flip111]

First line where ?

[fendor]

In the file you load, there should be a diagnostic in the first line. In the logs, you see the full error message, too.

Could not obtain flags for: "Distribution\Client\ProjectPlanning.hs".

We could not build all components.
If one of these components exposes this Module, make sure they compile.
You can try to invoke the commands yourself.
The following commands failed:

callProcessStderr: cabal v2-build --with-ghc=C:\Users\flip111\AppData\Local\Programs\stack\x86_64-windows\ghc-8.6.5\bin\ghc.exe --with-ghc-pkg=C:\Users\flip111\AppData\Local\Programs\stack\x86_64-windows\ghc-8.6.5\bin\ghc-pkg.exe --with-haddock=C:\Users\flip111\AppData\Local\Programs\stack\x86_64-windows\ghc-8.6.5\bin\haddock.exe --project-file=C:\Users\flip111\haskell\cabal\cabal.project --builddir=C:\Users\flip111\haskell\cabal\dist-newstyle --only-configure cabal-install:exe:cabal cabal-install:setup (exit 1): failed

Calling the command cabal v2-build --with-ghc=C:\Users\flip111\AppData\Local\Programs\stack\x86_64-windows\ghc-8.6.5\bin\ghc.exe --with-ghc-pkg=C:\Users\flip111\AppData\Local\Programs\stack\x86_64-windows\ghc-8.6.5\bin\ghc-pkg.exe --with-haddock=C:\Users\flip111\AppData\Local\Programs\stack\x86_64-windows\ghc-8.6.5\bin\haddock.exe --project-file=C:\Users\flip111\haskell\cabal\cabal.project --builddir=C:\Users\flip111\haskell\cabal\dist-newstyle --only-configure cabal-install:exe:cabal cabal-install:setup will show you the exact error message

[flip111]

Error:

The given project file 'C:Usersflip111haskellcabalcabal.project' does not exist.

Looks that somewhere windows paths are not properly handled

[fendor]

interesting, could be a cabal bug. Needs more investigating.
cc @jneira you have never encountered something like that before, right?

[flip111]

Do you think it's worth to report upstream ?

[fendor]

Probably, if you can provide a nice way to reproduce the issue.

[flip111]

I think i launched that command from a mingw shell. When i launch from cmd.exe i get the following

cabal: Unknown target 'cabal-install:setup'.
The package cabal-install has no component 'setup'.

[jneira]

I will try to load cabal in my local to reproduce it

[jneira]

I've just adding:

build-type: custom
custom-setup
   setup-depends:
       base

to a simple, working cabal project and i've got the same error so i am afraid that the error is generic.
cabal-helper tries to configure a component named package:setup that simply does not exist.
I guess the fix would be in cabal-helper itself but further investigation is needed.

@fendor could you comfirm that it is reproduced in linux, please?