fix: apply-mapping no longer fails if build-date is null (#561)

Signed-off-by: Johnny Bieren <[email protected]>

tasks/apply-mapping/README.md

@@ -26,6 +26,9 @@ This task supports variable expansion in tag values from the mapping. The curren
 | dataPath          | Path to the JSON string of the merged data to use in the data workspace                      | No       | -             |
 | failOnEmptyResult | Fail the task if the resulting snapshot contains zero components                             | Yes      | false         |
 
+## Changes in 1.6.1
+* The task no longer fails if the build-date label is missing from the image
+
 ## Changes in 1.6.0
 * The {{ timestamp }} tag now uses the build-date label of the image
 * Added {{ release_timestamp }} tag which works as the old {{ timestamp }} tag did

tasks/apply-mapping/apply-mapping.yaml

@@ -4,7 +4,7 @@ kind: Task
 metadata:
   name: apply-mapping
   labels:
-    app.kubernetes.io/version: "1.6.0"
+    app.kubernetes.io/version: "1.6.1"
   annotations:
     tekton.dev/pipelines.minVersion: "0.12.1"
     tekton.dev/tags: release
@@ -204,7 +204,7 @@ spec:
             os="$(jq -rs 'map(.platform.os) | .[0]' <<< "$arch_json")"
             build_date="$(skopeo inspect --no-tags --override-os "${os}" --override-arch "${arch}" \
               docker://"${IMAGE_REF}" | jq -r '.Labels."build-date"')"
-            timestamp="$(date -d "${build_date}" "+$passedTimestampFormat")"
+            timestamp="$(date -d "${build_date}" "+$passedTimestampFormat" || true)"
             if [ "${build_date}" == "null" ] ; then
               timestamp="null"
             fi