CI "Meta checks": correct cache key

.github/workflows/quick-jobs.yml

@@ -18,12 +18,15 @@ jobs:
   meta:
     name: Meta checks
     runs-on: ubuntu-latest
+    env:
+      cabal_build: >-
+        cabal build --builddir=dist-newstyle-meta --project-file=cabal.project.meta
+        gen-cabal-macros
+        gen-paths-module
+        gen-spdx
+        gen-spdx-exc
     # This job is not run in a container, any recent GHC should be fine
     steps:
-      - uses: actions/cache@v4
-        with:
-          path: ~/.local/state/cabal
-          key: linux-store-meta
       # OBSOLETE: workaround to fix ghcup directory rights.
       # # See https://github.com/haskell/cabal/pull/8739
       # - name: Sudo chmod to permit ghcup to update its cache
@@ -44,6 +47,17 @@ jobs:
       - name: Update Hackage index
         run: cabal v2-update
       - uses: actions/checkout@v4
+      - name: Generate build plan for correct cache key
+        run: ${{ env.cabal_build }} --dry-run
+      - name: Restore cached dependencies
+        uses: actions/cache/restore@v4
+        id: cache
+        with:
+          path: ~/.local/state/cabal
+          key: linux-store-meta-${{ hashfiles('dist-newstyle-meta/cache/plan.json') }}
+          restore-keys: linux-store-meta-
+      - name: Build tools
+        run: ${{ env.cabal_build }}
       - name: Regenerate files
         run: |
           make -B spdx
@@ -52,6 +66,13 @@ jobs:
         run: |
           git status > /dev/null
           git diff-files -p --exit-code
+      - name: Cache dependencies
+        uses: actions/cache/save@v4
+        if: always() && steps.cache.outputs.cache-hit != 'true'
+        with:
+          path: ~/.local/state/cabal
+          key: ${{ steps.cache.outputs.cache-primary-key }}
+
   doctest:
     name: Doctest Cabal
     runs-on: ubuntu-latest

Makefile

@@ -49,6 +49,9 @@ style-commit: ## Run the code styler on the previous commit
 SPDX_LICENSE_HS:=Cabal-syntax/src/Distribution/SPDX/LicenseId.hs
 SPDX_EXCEPTION_HS:=Cabal-syntax/src/Distribution/SPDX/LicenseExceptionId.hs
 
+# Note: the 'spdx' goal is used in .github/workflows/quick-jobs.yml.
+# Any changes to this goal need to be reconciled with this workflow.
+#
 .PHONY: spdx
 spdx : $(SPDX_LICENSE_HS) $(SPDX_EXCEPTION_HS)
 
@@ -65,6 +68,9 @@ $(SPDX_EXCEPTION_HS) : templates/SPDX.LicenseExceptionId.template.hs cabal-dev-s
 TEMPLATE_MACROS:=Cabal/src/Distribution/Simple/Build/Macros/Z.hs
 TEMPLATE_PATHS:=Cabal/src/Distribution/Simple/Build/PathsModule/Z.hs
 
+# Note: the 'templates' goal is used in .github/workflows/quick-jobs.yml.
+# Any changes to this goal need to be reconciled with this workflow.
+#
 .PHONY: templates
 templates : $(TEMPLATE_MACROS) $(TEMPLATE_PATHS)