Fix runners to do their best to gracefully stop on pod eviction (#1759)

Ref #1535
Ref #1581

Signed-off-by: Yusuke Kuoka <ykuoka@gmail.com>

test/startup/should_work_use_disable_update_switch/test.sh

@@ -0,0 +1,87 @@
+#!/usr/bin/env bash
+
+# UNITTEST: should work disable update
+# Will simulate a scneario where disableupdate=true. expects:
+# - the configuration step to be run exactly once
+# - the startup script to exit with no error
+# - the config.sh script to run with the --disableupdate flag set to 'true'.
+
+source ../assets/logging.sh
+
+startup_log() {
+  while read I; do
+    printf "\tstartup.sh: $I\n"
+  done
+}
+
+log "Setting up test area"
+export RUNNER_HOME=testarea
+mkdir -p ${RUNNER_HOME}
+
+log "Setting up the test"
+export UNITTEST=true
+export RUNNER_NAME="example_runner_name"
+export RUNNER_REPO="myorg/myrepo"
+export RUNNER_TOKEN="xxxxxxxxxxxxx"
+export DISABLE_RUNNER_UPDATE="true"
+
+# run.sh and config.sh get used by the runner's real entrypoint.sh and are part of actions/runner.
+# We change symlink dummy versions so the entrypoint.sh can run allowing us to test the real entrypoint.sh
+log "Symlink dummy config.sh and run.sh"
+ln -s ../../assets/config.sh ${RUNNER_HOME}/config.sh
+ln -s ../../assets/run.sh ${RUNNER_HOME}/run.sh
+
+cleanup() {
+  rm -rf ${RUNNER_HOME}
+  unset UNITTEST
+  unset RUNNERHOME
+  unset RUNNER_NAME
+  unset RUNNER_REPO
+  unset RUNNER_TOKEN
+}
+
+# Always run cleanup when test ends regardless of how it ends
+trap cleanup SIGINT SIGTERM SIGQUIT EXIT
+
+log "Running the startup script"
+log ""
+
+# run.sh and config.sh get used by the runner's real startup.sh and are part of actions/runner.
+# We change symlink dummy versions so the startup.sh can run allowing us to test the real entrypoint.sh
+../../../runner/startup.sh 2> >(startup_log)
+
+if [ "$?" != "0" ]; then
+  error "=========================="
+  error "FAIL | Test completed with errors"
+  exit 1
+fi
+
+log "Testing if the configuration step was run only once"
+count=`cat ${RUNNER_HOME}/counter || echo "not_found"`
+if [ ${count} != "1" ]; then
+  error "==============================================="
+  error "FAIL | The configuration step was not run exactly once"
+  exit 1
+fi
+success "PASS | The configuration ran ${count} time(s)"
+
+log "Testing if the configuration included the --disableupdate flag"
+if ! grep -q -- '--disableupdate' ${RUNNER_HOME}/runner_config; then
+  error "==============================================="
+  error "FAIL | The configuration should not include the --disableupdate flag"
+  exit 1
+fi
+
+success "PASS | The --disableupdate switch was included in the configuration"
+
+log "Testing if run.sh ran"
+if [ ! -f "${RUNNER_HOME}/run_sh_ran" ]; then
+  error "=============================="
+  error "FAIL | The runner service has not run"
+  exit 1
+fi
+
+success "PASS | run.sh ran"
+success ""
+success "==========================="
+success "Test completed successfully"