Output "stack-root " on Windows is not working

[Sorokin-Anton]

How to reproduce:

Try to run CI.yml with GitHub runner

jobs:
  build-and-test:
    runs-on: windows-latest
    strategy:
      matrix:
        stack: ["2.7.5"]
        ghc: ["9.0.2"]
        include:
          - ghc: "9.0.2"
            stackyaml: stack.yaml
    steps:
    - uses: actions/checkout@v3

    - uses: haskell/actions/setup@v2.0.1
      id: setup-haskell-stack
      name: Setup Haskell Stack
      with:
        ghc-version: ${{ matrix.ghc }}
        stack-version: ${{ matrix.stack }}

    - uses: actions/cache@v3
      name: Cache stack root
      with:
        path: ${{ steps.setup-haskell-stack.outputs.stack-root }}
        key: ${{ runner.os }}-${{ matrix.ghc }}-stack
    ...

What should happen:

${{ steps.setup-haskell-stack.outputs.stack-root }} is replaced by stack root created in setup

What happens:

Build fails with Error: Input required and not supplied: path

Additional info:

If I try to run echo "${{ steps.setup-haskell-stack.outputs.stack-root }}", it prints empty string

[andreasabel]

@Sorokin-Anton wrote:

matrix:
        stack: ["2.7.5"]
        ghc: ["9.0.2"]
        include:
          - ghc: "9.0.2"
            stackyaml: stack.yaml

This matrix looks ill-formed to me, but maybe it works nevertheless? Could it be the source of your problem, maybe?

Can you link to a failing CI run?

[Sorokin-Anton]

I manually inserted the path to stack root and everything works, I don't think that problem is in matrix
Attempt to echo job output: serokell/xrefcheck@7394d8a
Job: https://github.com/serokell/xrefcheck/actions/runs/3211364966/jobs/5249483031
If I remove echo, I still can't use cache: serokell/xrefcheck@f4ba88f

[andreasabel]

Job: serokell/xrefcheck/actions/runs/3211364966/jobs/5249483031

If you look at this job and what haskell-setup is doing, you see that it does not even attempt to do anything around stack. I think you need to pass:

enable-stack: true

to the action to get it to install stack.

actions/setup/README.md

Lines 62 to 67 in cfcdd36

	- uses: haskell/actions/setup@v2
	with:
	ghc-version: '8.8.4' # Exact version of ghc to use
	# cabal-version: 'latest'. Omitted, but defaults to 'latest'
	enable-stack: true
	stack-version: 'latest'

[andreasabel]

@Sorokin-Anton I am closing this issue, but feel free to reopen if my suggestion of enable-stack: true does not fix the OP.

I admit the API is awkward, so I opened this issue instead:

• enable-stack: true should be implied by other stack-related options #142