Does this action reuse pre-installed versions of GHC and Cabal? #119
Description
The README says:
The GitHub runners come with pre-installed versions of GHC and Cabal. Those will be used whenever possible.
But check out this workflow run:
Run cabal --version
cabal-install version 3.14.1.1
compiled using version 3.14.1.1 of the Cabal library
but
Resolved cabal latest to 3.14.1.1
Preparing ghc environment
Installing ghc version 9.8.4
Preparing cabal environment
Installing cabal version 3.14.1.1
/opt/hostedtoolcache/ghcup/0.1.50.1/x64/ghcup whereis cabal 3.14.1.1
[ Error ] [�
Attempting to access tool cabal at location /opt/cabal/3.14/bin
Failed to access tool cabal at location /opt/cabal/3.14/bin
Attempting to access tool cabal at location /home/runner/.ghcup/bin
Succeeded accessing tool cabal at location /home/runner/.ghcup/bin
/opt/hostedtoolcache/ghcup/0.1.50.1/x64/ghcup set cabal 3.14.1.1
[ Error ] [�
/opt/hostedtoolcache/ghcup/0.1.50.1/x64/ghcup unset cabal
[ Info ] Cabal successfully unset
Attempting to install cabal 3.14.1.1 using ghcup
/opt/hostedtoolcache/ghcup/0.1.50.1/x64/ghcup install cabal 3.14.1.1
[ Info ] downloading: https://downloads.haskell.org/~ghcup/unofficial-bindists/cabal/3.14.1.1/cabal-install-3.14.1.1-x86_64-linux-ubuntu22.04.tar.xz as file /usr/local/.ghcup/tmp/ghcup-4e6b75f5cebe0ee4/cabal-install-3.14.1.1-x86_64-linux-ubuntu22.04.tar.xz
It appears that the requested version match the pre-installed version, but then ghcup is still downloading and re-installing the same Cabal version. Am I reading this wrong? Or is this possibly a bug?
Workflow file (not quite minimal)
name: CI
on:
push:
pull_request:
jobs:
build:
runs-on: ${{ matrix.os }}
strategy:
matrix:
ghc: ["9.4.8", "9.6.6", "9.8.4"]
os: [ubuntu-22.04]
# complete all jobs
fail-fast: false
name: GREASE - GHC v${{ matrix.ghc }}
steps:
- run: cabal --version
- uses: haskell-actions/setup@v2
with:
ghc-version: ${{ matrix.ghc }}