Fixed panic in kn service describe (#1529)

* Fixed panic in kn service describe * Added changelog entry * Update CHANGELOG.adoc Co-authored-by: David Simansky <[email protected]> Co-authored-by: David Simansky <[email protected]>
knative · Nov 23, 2021 · 4316d03 · 4316d03
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diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
@@ -12,6 +12,17 @@
 | https://github.com/knative/client/pull/[#]
 ////
 
+## v1.1.0 (Unreleased)
+[cols="1,10,3", options="header", width="100%"]
+|===
+| | Description | PR
+
+| 🐛
+| Fixed panic in kn service describe
+| https://github.com/knative/client/pull/1529[#1529]
+
+|===
+
 ## v1.0.0 (2021-11-02)
 [cols="1,10,3", options="header", width="100%"]
 |===

diff --git a/pkg/kn/commands/revision/describe.go b/pkg/kn/commands/revision/describe.go
@@ -162,7 +162,12 @@ func WriteImage(dw printers.PrefixWriter, revision *servingv1.Revision) {
 	// Check if the user image is likely a more user-friendly description
 	pinnedDesc := "at"
 	userImage := clientserving.UserImage(&revision.ObjectMeta)
-	imageDigest := revision.Status.ContainerStatuses[0].ImageDigest
+
+	containerStatuses := revision.Status.ContainerStatuses
+	var imageDigest string
+	if len(containerStatuses) > 0 {
+		imageDigest = containerStatuses[0].ImageDigest
+	}
 	if userImage != "" && imageDigest != "" {
 		var parts []string
 		if strings.Contains(image, "@") {