Automator: update common-files@master in istio/api@master (#2873)

Author: istio-testing

common/.commonfiles.sha

@@ -1 +1 @@
-fcd31eb2297bc18a96ee4bafefcb3e1e298dc330
+aea3a48610b7476dccd70e84b3f84668e7fa7dca

common/scripts/tracing.sh

@@ -37,8 +37,10 @@ function _genattrs() {
   # No upstream standard, so copy from https://github.com/jenkinsci/opentelemetry-plugin/blob/master/docs/job-traces.md
   if [[ -n "${PULL_NUMBER:=}" ]]
   then
+    # Presubmit
     url="https://prow.istio.io/view/gs/istio-prow/pr-logs/pull/${REPO_OWNER}_${REPO_NAME}/${PULL_NUMBER}/${JOB_NAME}/${BUILD_ID},"
   else
+    # Postsubmit or periodic
     url="https://prow.istio.io/view/gs/istio-prow/pr-logs/${JOB_NAME}/${BUILD_ID},"
   fi
   # Use printf instead of echo to avoid spaces between args
@@ -47,9 +49,9 @@ function _genattrs() {
     "ci.pipeline.run.url=${url}"\
     "ci.pipeline.run.number=${BUILD_ID},"\
     "ci.pipeline.run.id=${PROW_JOB_ID},"\
-    "ci.pipeline.run.repo=${REPO_OWNER}/${REPO_NAME},"\
-    "ci.pipeline.run.base=${PULL_BASE_REF},"\
-    "ci.pipeline.run.pull_number=${PULL_NUMBER},"\
+    "ci.pipeline.run.repo=${REPO_OWNER:-unknown}/${REPO_NAME:-unknown},"\
+    "ci.pipeline.run.base=${PULL_BASE_REF:-none},"\
+    "ci.pipeline.run.pull_number=${PULL_NUMBER:-none},"\
     "ci.pipeline.run.pull_sha=${PULL_PULL_SHA:-${PULL_BASE_SHA:-none}}"
 }