Jammy is not compatible with GHC versions `<= 8.8`

[BinderDavid]

I just used the current version from master to generate a new CI config for ghc-events in this pull request: https://github.com/haskell/ghc-events/pull/105

The generated CI configuration doesn't seem to work for GHC versions <= 8.8. The build failure in the logs looks like this:

E: The repository 'https://ppa.launchpadcontent.net/hvr/ghc/ubuntu jammy Release' does not have a Release file.
Repository: 'deb https://ppa.launchpadcontent.net/hvr/ghc/ubuntu/ jammy main'

[phadej]

I'm confused. The haskell-ci uses ghcup by default on jammy, see e.g. https://github.com/haskell-unordered-containers/hashable/blob/7837d1d54799a03794d0868cff49f99663048256/.github/workflows/haskell-ci.yml which doesn't has any particular configuration related which installed method to use.

In particular, when distribution is jammy, we force to use ghcup for all fjobs: https://github.com/haskell-CI/haskell-ci/blob/28aae7df5ae36ec1eb1814e810a7a02af64c5c99/src/HaskellCI/Config.hs#L273

As the linked issue moved to use a haskell-ci fork (so I cannot see what they did, why the issue failed), I'll close this as invalid if no further information is provided.

[BinderDavid]

Sorry, I forgot that force-pushing on that branch prohibits you from seeing the last version.

Here are the steps to reproduce:

• Use the haskell-ci binary compiled from the master branch of github.com/haskell-CI/haskell-ci/
• Checkout the latest commit from the master-branch of github.com/haskell/ghc-events
• run haskell-ci regenerate

This results in the following output on the command line:

No haskell-ci.sh, skipping bash regeneration
*INFO* Generating GitHub config for testing for GHC versions: 8.0.2 8.2.2 8.4.4 8.6.5 8.8.4 8.10.7 9.0.2 9.2.4 9.4.2 9.6.1 9.8.1

And the following diff:

--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -8,9 +8,9 @@
 #
 # For more information, see https://github.com/haskell-CI/haskell-ci
 #
-# version: 0.17.20231203
+# version: 0.19.20240514
 #
-# REGENDATA ("0.17.20231203",["github","ghc-events.cabal"])
+# REGENDATA ("0.19.20240514",["github","ghc-events.cabal"])
 #
 name: Haskell-CI
 on:
@@ -23,7 +23,7 @@ jobs:
     timeout-minutes:
       60
     container:
-      image: buildpack-deps:bionic
+      image: buildpack-deps:jammy
     continue-on-error: ${{ matrix.allow-failure }}
     strategy:
       matrix:
@@ -187,7 +187,7 @@ jobs:
           chmod a+x $HOME/.cabal/bin/cabal-plan
           cabal-plan --version
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: source
       - name: initial cabal.project for sdist
@@ -215,7 +215,7 @@ jobs:
           if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "    ghc-options: -Werror=missing-methods" >> cabal.project ; fi
           cat >> cabal.project <<EOF
           EOF
-          $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: $_ installed\n" unless /^(ghc-events)$/; }' >> cabal.project.local
+          $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: any.$_ installed\n" unless /^(ghc-events)$/; }' >> cabal.project.local
           cat cabal.project
           cat cabal.project.local
       - name: dump install plan
@@ -223,7 +223,7 @@ jobs:
           $CABAL v2-build $ARG_COMPILER $ARG_TESTS $ARG_BENCH --dry-run all
           cabal-plan
       - name: restore cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           key: ${{ runner.os }}-${{ matrix.compiler }}-${{ github.sha }}
           path: ~/.cabal/store
@@ -253,7 +253,7 @@ jobs:
           rm -f cabal.project.local
           $CABAL v2-build $ARG_COMPILER --disable-tests --disable-benchmarks all
       - name: save cache
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
         if: always()
         with:
           key: ${{ runner.os }}-${{ matrix.compiler }}-${{ github.sha }}

The previous version of the script already used the setup-method: hvr-ppa option. Using haskell-ci regenerate then replaced the image by jammy, but didn't change the setup-method to ghcup. This leaves the regenerated build script in a state which doesn't work.

[phadej]

Ok. I see, the bug is that the code i linked is not run if cabal.haskell-ci config file doesn't exist. If you add (even an empty cabal.haskell-ci file), the diff will have things like

@@ -61,49 +61,39 @@ jobs:
           - compiler: ghc-8.8.4
             compilerKind: ghc
             compilerVersion: 8.8.4
-            setup-method: hvr-ppa
+            setup-method: ghcup
             allow-failure: false

I have to investigate why the no-config file and config file case differs; but the "workaround" isn't too bad for now.