Detect matching EE and FOSS tests based on MR changes

.gitignore

@@ -94,5 +94,6 @@ webpack-dev-server.json
 .solargraph.yml
 apollo.config.js
 /tmp/matching_foss_tests.txt
+/tmp/matching_tests.txt
 ee/changelogs/unreleased-ee
 

.gitlab/ci/rails.gitlab-ci.yml

@@ -493,19 +493,17 @@ rspec-ee system pg12 geo:
 rspec foss-impact:
   extends:
     - .rspec-base-pg11-as-if-foss
-    - .rails:rules:ee-mr-only
+    - .rails:rules:rspec-foss-impact
+  needs: ["setup-test-env", "retrieve-tests-metadata", "compile-test-assets as-if-foss", "detect-tests as-if-foss"]
   script:
-    - install_gitlab_gem
-    - install_tff_gem
     - run_timed_command "scripts/gitaly-test-build"
     - run_timed_command "scripts/gitaly-test-spawn"
     - source scripts/rspec_helpers.sh
-    - tooling/bin/find_foss_tests tmp/matching_foss_tests.txt
     - rspec_matched_foss_tests tmp/matching_foss_tests.txt "--tag ~quarantine"
   artifacts:
     expire_in: 7d
     paths:
-      - tmp/matching_foss_tests.txt
       - tmp/capybara/
+
 # EE: Canonical MR pipelines
 ##################################################

.gitlab/ci/rules.gitlab-ci.yml

@@ -555,7 +555,16 @@
     - <<: *if-master-refs
       changes: *code-backstage-patterns
 
-.rails:rules:ee-mr-only:
+.rails:rules:detect-tests:
+  rules:
+    - <<: *if-not-ee
+      when: never
+    - <<: *if-security-merge-request
+      changes: *code-backstage-patterns
+    - <<: *if-dot-com-gitlab-org-merge-request
+      changes: *code-backstage-patterns
+
+.rails:rules:rspec-foss-impact:
   rules:
     - <<: *if-not-ee
       when: never

.gitlab/ci/setup.gitlab-ci.yml

@@ -59,3 +59,34 @@ verify-tests-yml:
     - source scripts/utils.sh
     - install_tff_gem
     - scripts/verify-tff-mapping
+
+.detect-test-base:
+  image: ruby:2.6-alpine
+  needs: []
+  stage: prepare
+  script:
+    - source scripts/utils.sh
+    - install_gitlab_gem
+    - install_tff_gem
+    - tooling/bin/find_foss_tests ${MATCHED_TESTS_FILE}
+  artifacts:
+    expire_in: 7d
+    paths:
+      - ${MATCHED_TESTS_FILE}
+
+detect-tests:
+  extends:
+    - .detect-test-base
+    - .rails:rules:detect-tests
+  variables:
+    MATCHED_TESTS_FILE: tmp/matching_tests.txt
+
+detect-tests as-if-foss:
+  extends:
+    - .detect-test-base
+    - .rails:rules:detect-tests
+    - .as-if-foss
+  variables:
+    MATCHED_TESTS_FILE: tmp/matching_foss_tests.txt
+  before_script:
+    - '[ "$FOSS_ONLY" = "1" ] && rm -rf ee/ qa/spec/ee/ qa/qa/specs/features/ee/ qa/qa/ee/ qa/qa/ee.rb'