nix: avoid updating cabal on every run

Resolves #4206

.github/workflows/test.yaml

@@ -44,7 +44,9 @@ jobs:
         uses: ./.github/actions/setup-nix
         with:
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-          tools: tests.coverage.bin tests.testDoctests.bin tests.testSpecIdempotence.bin
+          tools: tests.coverage.bin tests.testDoctests.bin tests.testSpecIdempotence.bin cabalTools.update.bin
+
+      - run: postgrest-cabal-update
 
       - name: Run coverage (IO tests and Spec tests against PostgreSQL 15)
         run: postgrest-coverage
@@ -81,7 +83,9 @@ jobs:
         uses: ./.github/actions/setup-nix
         with:
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-          tools: tests.testSpec.bin tests.testIO.bin tests.testBigSchema.bin withTools.postgresql-${{ matrix.pgVersion }}.bin
+          tools: tests.testSpec.bin tests.testIO.bin tests.testBigSchema.bin withTools.postgresql-${{ matrix.pgVersion }}.bin cabalTools.update.bin
+
+      - run: postgrest-cabal-update
 
       - name: Run spec tests
         if: always()
@@ -105,7 +109,10 @@ jobs:
         uses: ./.github/actions/setup-nix
         with:
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-          tools: tests.testMemory.bin
+          tools: tests.testMemory.bin cabalTools.update.bin
+
+      - run: postgrest-cabal-update
+
       - name: Run memory tests
         run: postgrest-test-memory
 
@@ -124,7 +131,10 @@ jobs:
         uses: ./.github/actions/setup-nix
         with:
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-          tools: loadtest.loadtestAgainst.bin loadtest.report.bin
+          tools: loadtest.loadtestAgainst.bin loadtest.report.bin cabalTools.update.bin
+
+      - run: postgrest-cabal-update
+
       - name: Run loadtest
         env:
           TARGET_BRANCH: ${{ github.base_ref || github.ref_name }}

nix/tools/cabalTools.nix

@@ -15,7 +15,6 @@ let
         withEnv = postgrest.env;
       }
       ''
-        ${cabal-install}/bin/cabal v2-update
         exec ${cabal-install}/bin/cabal v2-build ${devCabalOptions} "''${_arg_leftovers[@]}"
       '';
 
@@ -34,6 +33,17 @@ let
         exec ${cabal-install}/bin/cabal v2-clean
       '';
 
+  update =
+    checkedShellScript
+      {
+        name = "postgrest-cabal-update";
+        docs = "Update cabal's package list from hackage.haskell.org";
+        workingDir = "/";
+      }
+      ''
+        exec ${cabal-install}/bin/cabal v2-update
+      '';
+
   run =
     checkedShellScript
       {
@@ -85,7 +95,6 @@ let
         export PGRST_DB_POOL_ACQUISITION_TIMEOUT
         export PGRST_JWT_SECRET
 
-        ${cabal-install}/bin/cabal v2-update
         ${cabal-install}/bin/cabal --builddir="dist-prof" v2-build --enable-profiling --disable-shared exe:postgrest
         ${cabal-install}/bin/cabal --builddir="dist-prof" v2-run -- \
           postgrest +RTS -p -h -RTS "''${_arg_leftovers[@]}"
@@ -111,6 +120,7 @@ buildToolbox
     inherit
       build
       clean
+      update
       run
       runProfiled
       repl;

nix/tools/devTools.nix

@@ -251,7 +251,6 @@ let
       }
       ''
         mkdir -p "$_arg_dumpdir"
-        ${cabal-install}/bin/cabal v2-update
         ${cabal-install}/bin/cabal v2-build ${devCabalOptions} \
           --builddir="$tmpdir" \
           --ghc-option=-ddump-minimal-imports \

nix/tools/tests.nix

@@ -28,7 +28,6 @@ let
         withEnv = postgrest.env;
       }
       ''
-        ${cabal-install}/bin/cabal v2-update
         ${withTools.withPg} -f test/spec/fixtures/load.sql \
           ${cabal-install}/bin/cabal v2-run ${devCabalOptions} test:spec -- "''${_arg_leftovers[@]}"
       '';
@@ -42,7 +41,6 @@ let
         withEnv = postgrest.env;
       }
       ''
-        ${cabal-install}/bin/cabal v2-update
         # This makes nix-env -iA tests.doctests.bin work.
         export NIX_GHC=${postgrest.env.NIX_GHC}
         ${cabal-install}/bin/cabal v2-run ${devCabalOptions} test:doctests
@@ -57,7 +55,6 @@ let
         withEnv = postgrest.env;
       }
       ''
-        ${cabal-install}/bin/cabal v2-update
         ${withTools.withPg} -f test/spec/fixtures/load.sql \
           ${runtimeShell} -c " \
             ${cabal-install}/bin/cabal v2-run ${devCabalOptions} test:spec && \
@@ -85,7 +82,6 @@ let
         withEnv = postgrest.env;
       }
       ''
-        ${cabal-install}/bin/cabal v2-update
         ${cabal-install}/bin/cabal v2-build ${devCabalOptions} exe:postgrest
         ${cabal-install}/bin/cabal v2-exec -- ${withTools.withPg} -f test/io/fixtures.sql \
           ${ioTestPython}/bin/pytest --ignore=test/io/test_big_schema.py --ignore=test/io/test_replica.py -v test/io "''${_arg_leftovers[@]}"
@@ -101,7 +97,6 @@ let
         withEnv = postgrest.env;
       }
       ''
-        ${cabal-install}/bin/cabal v2-update
         ${cabal-install}/bin/cabal v2-build ${devCabalOptions} exe:postgrest
         ${cabal-install}/bin/cabal v2-exec -- ${withTools.withPg} -f test/io/big_schema.sql \
           ${ioTestPython}/bin/pytest -v test/io/test_big_schema.py "''${_arg_leftovers[@]}"
@@ -117,7 +112,6 @@ let
         withEnv = postgrest.env;
       }
       ''
-        ${cabal-install}/bin/cabal v2-update
         ${cabal-install}/bin/cabal v2-build ${devCabalOptions} exe:postgrest
         ${cabal-install}/bin/cabal v2-exec -- ${withTools.withPg} --replica -f test/io/replica.sql \
           ${ioTestPython}/bin/pytest -v test/io/test_replica.py "''${_arg_leftovers[@]}"
@@ -133,7 +127,6 @@ let
         withPath = [ jq ];
       }
       ''
-        ${cabal-install}/bin/cabal v2-update
         ${withTools.withPg} -f test/spec/fixtures/load.sql \
             ${cabal-install}/bin/cabal v2-run ${devCabalOptions} --verbose=0 -- \
             postgrest --dump-schema
@@ -162,7 +155,6 @@ let
           rm -rf coverage/*
 
           # build once before running all the tests
-          ${cabal-install}/bin/cabal v2-update
           ${cabal-install}/bin/cabal v2-build ${devCabalOptions} exe:postgrest lib:postgrest test:spec
 
           (
@@ -246,7 +238,6 @@ let
         withPath = [ curl ];
       }
       ''
-        ${cabal-install}/bin/cabal v2-update
         ${cabal-install}/bin/cabal --builddir="dist-prof" v2-build --enable-profiling --disable-shared exe:postgrest
         ${cabal-install}/bin/cabal --builddir="dist-prof" v2-exec -- ${withTools.withPg} -f test/spec/fixtures/load.sql \
           test/memory/memory-tests.sh