rabbitmq-server: Fix reported version (#367395)

Fixes the version in `rabbitmqctl --version` and the web interface

pkgs/by-name/ra/rabbitmq-server/package.nix

@@ -87,6 +87,7 @@ stdenv.mkDerivation rec {
 
   preBuild = ''
     export LANG=C.UTF-8 # fix elixir locale warning
+    export PROJECT_VERSION="$version"
   '';
 
   postInstall = ''
@@ -106,6 +107,19 @@ stdenv.mkDerivation rec {
     rm $out/INSTALL
   '';
 
+  # Can not use versionCheckHook since that doesn't allow for setting environment variables
+  # which is necessary since Erlang needs a $HOME for the Cookie.
+  doInstallCheck = true;
+  installCheckPhase = ''
+    runHook preInstallCheck
+    out="$(env - LANG=C.utf8 HOME=/build ${placeholder "out"}/bin/rabbitmqctl version)"
+    if [[ "$out" != "$version" ]]; then
+      echo "Rabbitmq should report version $version, but thinks it's version $out" >&2
+      exit 1
+    fi
+    runHook postInstallCheck
+  '';
+
   passthru.tests = {
     vm-test = nixosTests.rabbitmq;
   };