Merge branch 'qa-shl-selective-test-execution-first-iteration' into 'master'

If an MR changes only e2e tests, run only those e2e tests

See merge request gitlab-org/gitlab!73833

.gitlab/ci/qa.gitlab-ci.yml

@@ -58,6 +58,9 @@ update-qa-cache:
     - tooling/bin/find_change_diffs ${CHANGES_DIFFS_DIR}
   script:
     - |
+      tooling/bin/qa/check_if_qa_only_spec_changes ${CHANGES_FILE} ${ONLY_QA_CHANGES_FILE}
+      [ -f $ONLY_QA_CHANGES_FILE ] && export QA_TESTS="`cat $ONLY_QA_CHANGES_FILE`"
+      echo "QA_TESTS: $QA_TESTS"
       tooling/bin/qa/package_and_qa_check ${CHANGES_DIFFS_DIR} && exit_code=$?
       if [ $exit_code -eq 0 ]; then
         ./scripts/trigger-build omnibus
@@ -80,9 +83,11 @@ update-qa-cache:
     expire_in: 7d
     paths:
       - ${CHANGES_FILE}
+      - ${ONLY_QA_CHANGES_FILE}
       - ${CHANGES_DIFFS_DIR}/*
   variables:
     CHANGES_FILE: tmp/changed_files.txt
+    ONLY_QA_CHANGES_FILE: tmp/qa_only_changed_files.txt
     CHANGES_DIFFS_DIR: tmp/diffs
 
 .package-and-qa-ff-base:

scripts/trigger-build

@@ -155,7 +155,8 @@ module Trigger
         'ee' => Trigger.ee? ? 'true' : 'false',
         'QA_BRANCH' => ENV['QA_BRANCH'] || 'master',
         'CACHE_UPDATE' => ENV['OMNIBUS_GITLAB_CACHE_UPDATE'],
-        'GITLAB_QA_OPTIONS' => ENV['GITLAB_QA_OPTIONS']
+        'GITLAB_QA_OPTIONS' => ENV['GITLAB_QA_OPTIONS'],
+        'QA_TESTS' => ENV['QA_TESTS']
       }
     end
   end

tooling/bin/qa/check_if_qa_only_spec_changes

+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+# This script assumes the first argument is a path to a file containing a list of changed files and the second argument
+# is the path of a file where a list of end-to-end spec files with the leading 'qa/' trimmed will be written to if
+# all the files are end-to-end test spec files.
+
+abort("ERROR: Please specify the file containing the list of changed files and a file where the qa only spec files will be written") if ARGV.size != 2
+file_contents = File.read(ARGV.shift).split(' ')
+
+all_files_are_qa_specs = file_contents.all? { |file_path| file_path =~ %r{^qa\/qa\/specs\/features\/} }
+
+output_file = ARGV.shift
+
+if all_files_are_qa_specs
+  qa_spec_paths_trimmed = file_contents.map { |path| path.sub('qa/', '') }
+  File.write(output_file, qa_spec_paths_trimmed.join(' '))
+end