Report PR start time too (#1407)

ci/build-loop.sh

@@ -9,7 +9,10 @@
 . build-helpers.sh
 get_config
 
-ensure_vars CI_NAME CHECK_NAME PR_REPO PR_BRANCH PACKAGE ALIBUILD_DEFAULTS
+PR_START_TIME=$(TZ=Europe/Zurich date +'%a %H:%M CET')
+echo "$PR_START_TIME: Started building check $CHECK_NAME for $PR_REPO@$PR_HASH on $host_id"
+
+ensure_vars CI_NAME CHECK_NAME PR_REPO PR_BRANCH PACKAGE ALIBUILD_DEFAULTS PR_START_TIME
 
 : "${WORKERS_POOL_SIZE:=1}" "${WORKER_INDEX:=0}" "${PR_REPO_CHECKOUT:=$(basename "$PR_REPO")}"
 
@@ -47,12 +50,12 @@ case "$BUILD_TYPE" in
   # Create a status on GitHub showing the build start time, but only if this is
   # the first build of this check!
   # If we are running in Nomad, add a link to the this allocation.
-  untested) report_pr_errors --pending -m "Started $(TZ=Europe/Zurich date +'%a %H:%M CET') on $host_id" \
+  untested) report_pr_errors --pending -m "Started $PR_START_TIME on $host_id" \
                              ${NOMAD_ALLOC_ID:+--log-url "https://alinomad.cern.ch/ui/allocations/$NOMAD_ALLOC_ID"} ;;
   # Rebuilds only change the existing status's message, keeping the red status
   # and URL intact.
   failed) set-github-status -k -c "$PR_REPO@$PR_HASH" -s "$CHECK_NAME/$(build_type_to_status "$BUILD_TYPE")" \
-                            -m "Rechecking since $(TZ=Europe/Zurich date +'%a %H:%M CET') on $host_id" ;;
+                            -m "Rechecking since $PR_START_TIME on $host_id" ;;
   # See above for why we don't update the status for green checks.
   succeeded) ;;
 esac

report-pr-errors

@@ -372,6 +372,7 @@ class Logs(object):
                                        self.fst_task_timeout or
                                        self.fst_failed_command),
                 'hostname': htmlescape(platform.node()),
+                'pr_start_time': os.getenv('PR_START_TIME', ''),
                 'finish_time': datetime.datetime.now().strftime('%a %-d %b %Y, %H:%M:%S %Z'),
                 'repo': self.pr_built.repo_name,
                 'pr_id': self.pr_built.id,
@@ -588,6 +589,7 @@ PRETTY_LOG_TEMPLATE = '''\
   <h1>The build %(status)s</h1>
   <table>
     <tr><th>Build host</th><td>%(hostname)s</td></tr>
+    <tr><th>Started at</th><td>%(pr_start_time)s</td></tr>
     <tr><th>Finished at</th><td>%(finish_time)s</td></tr>
     <tr><th>Built PR</th>
         <td><a href="https://github.com/%(repo)s/pull/%(pr_id)s">%(repo)s#%(pr_id)s</a></td></tr>