Check the GHC and cabal-install version which are used to build the release

Author: mpickering

.gitlab/ci.sh

@@ -6,9 +6,14 @@ source "$CI_PROJECT_DIR/.gitlab/common.sh"
 
 ## Figure out how to get the Haskell toolchain.
 
-# For backport, the centos image no longer has the right GHC version, so use
-# ghcup.
-if [[ -f /etc/os-release && "$(grep ^ID /etc/os-release)" =~ "centos" ]]; then
+echo "Base image has GHC version: $($GHC --numeric-version)"
+
+# Check that GHC_VERSION and the version in the image match.
+if [[ "$($GHC --numeric-version)" != "${GHC_VERSION}"  ]]; then
+    echo "Incorrect ghc version installed, installing via ghcup. $($GHC --numeric-version) != ${GHC_VERSION}"
+    . "$CI_PROJECT_DIR/.gitlab/ghcup.sh"
+elif [[ "$(cabal --numeric-version)" != "${CABAL_INSTALL_VERSION}"  ]]; then
+    echo "Incorrect cabal version installed, installing via ghcup. $(cabal --numeric-version) != ${CABAL_INSTALL_VERSION}"
     . "$CI_PROJECT_DIR/.gitlab/ghcup.sh"
 # All the other ones are fine.
 elif [[ "$(uname)" == "Linux" ]]; then
@@ -18,6 +23,19 @@ else
     . "$CI_PROJECT_DIR/.gitlab/ghcup.sh"
 fi
 
+
+if [[ "$(ghc --numeric-version)" != "${GHC_VERSION}"  ]]; then
+  fail "Failed to install GHC version (actual: $(ghc --numeric-version), expected: ${GHC_VERSION}";
+fi
+
+if [[ "$(cabal --numeric-version)" != "${CABAL_INSTALL_VERSION}"  ]]; then
+  fail "Failed to install GHC version (actual: $(ghc --numeric-version), expected: ${GHC_VERSION}";
+fi
+
+echo "Using GHC version: $(ghc --numeric-version)";
+echo "Using cabal-install version: $(cabal --numeric-version)";
+
+
 export CABAL_DIR="$CI_PROJECT_DIR/cabal"
 
 case "$(uname)" in