3 files changed, 84 insertions, 1 deletions
diff --git a/tooling/bin/find_change_diffs b/tooling/bin/find_change_diffs
new file mode 100755
index 00000000000..7857945ea74
--- /dev/null
+++ b/tooling/bin/find_change_diffs
@@ -0,0 +1,38 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require 'gitlab'
+require 'pathname'
+
+# This script saves the diffs of changes in an MR to the directory specified as the first argument
+#
+# It exits with a success code if diffs are found and saved, or if there are no changes, including if the script runs in
+# a pipeline that is not for a merge request.
+
+gitlab_token = ENV.fetch('PROJECT_TOKEN_FOR_CI_SCRIPTS_API_USAGE')
+gitlab_endpoint = ENV.fetch('CI_API_V4_URL')
+mr_project_path = ENV['CI_MERGE_REQUEST_PROJECT_PATH']
+mr_iid = ENV['CI_MERGE_REQUEST_IID']
+
+puts "CI_MERGE_REQUEST_PROJECT_PATH is missing." if mr_project_path.to_s.empty?
+puts "CI_MERGE_REQUEST_IID is missing." if mr_iid.to_s.empty?
+
+unless mr_project_path && mr_iid
+  puts "Exiting as this does not appear to be a merge request pipeline."
+  exit
+end
+
+abort("ERROR: Please specify a directory to write MR diffs into.") if ARGV.empty?
+output_diffs_dir = Pathname.new(ARGV.shift).expand_path
+
+Gitlab.configure do |config|
+  config.endpoint       = gitlab_endpoint
+  config.private_token  = gitlab_token
+end
+
+Gitlab.merge_request_changes(mr_project_path, mr_iid).changes.each do |change|
+  next if change['diff'].empty?
+
+  output_diffs_dir.join(File.dirname(change['new_path'])).mkpath
+  output_diffs_dir.join("#{change['new_path']}.diff").write(change['diff'])
+end
diff --git a/tooling/bin/find_changes b/tooling/bin/find_changes
index 466510ccb19..20df085879a 100755
--- a/tooling/bin/find_changes
+++ b/tooling/bin/find_changes
@@ -3,7 +3,7 @@
 
 require 'gitlab'
 
-gitlab_token = ENV.fetch('DANGER_GITLAB_API_TOKEN', '')
+gitlab_token = ENV.fetch('PROJECT_TOKEN_FOR_CI_SCRIPTS_API_USAGE', '')
 gitlab_endpoint = ENV.fetch('CI_API_V4_URL')
 mr_project_path = ENV.fetch('CI_MERGE_REQUEST_PROJECT_PATH')
 mr_iid = ENV.fetch('CI_MERGE_REQUEST_IID')
diff --git a/tooling/bin/qa/package_and_qa_check b/tooling/bin/qa/package_and_qa_check
new file mode 100755
index 00000000000..21deb0fcd2d
--- /dev/null
+++ b/tooling/bin/qa/package_and_qa_check
@@ -0,0 +1,45 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require 'pathname'
+
+# This script checks if the package-and-qa job should trigger downstream pipelines to run the QA suite.
+#
+# It assumes the first argument is a directory of files containing diffs of changes from an MR
+# (e.g., created by tooling/bin/find_change_diffs). It exits with a success code if there are no diffs, or if the diffs
+# are suitable to run QA tests.
+#
+# The script will abort (exit code 1) if the argument is missing.
+#
+# The following condition will result in a failure code (2), indicating that package-and-qa should not run:
+#
+#   - If the changes only include tests being put in quarantine
+
+abort("ERROR: Please specify the directory containing MR diffs.") if ARGV.empty?
+diffs_dir = Pathname.new(ARGV.shift).expand_path
+
+# Run package-and-qa if there are no diffs. E.g., in scheduled pipelines
+exit 0 if diffs_dir.glob('**/*').empty?
+
+files_count = 0
+specs_count = 0
+quarantine_specs_count = 0
+
+diffs_dir.glob('**/*').each do |path|
+  next if path.directory?
+
+  files_count += 1
+  next unless path.to_s.end_with?('_spec.rb.diff')
+
+  specs_count += 1
+  quarantine_specs_count += 1 if path.read.match?(/^\+.*, quarantine:/)
+end
+
+# Run package-and-qa if there are no specs. E.g., when the MR changes QA framework files.
+exit 0 if specs_count == 0
+
+# Skip package-and-qa if there are only specs being put in quarantine.
+exit 2 if quarantine_specs_count == specs_count && quarantine_specs_count == files_count
+
+# Run package-and-qa under any other circumstances. E.g., if there are specs being put in quarantine but there are also
+# other changes that might need to be tested.