[bitnami/common] New helper to return image version (#19223)

bitnami/common/Chart.yaml

@@ -6,7 +6,7 @@ annotations:
   licenses: Apache-2.0
 apiVersion: v2
 # Please make sure that version and appVersion are always the same.
-appVersion: 2.10.1
+appVersion: 2.11.0
 description: A Library Helm Chart for grouping common logic between bitnami charts. This chart is not deployable by itself.
 home: https://bitnami.com
 icon: https://bitnami.com/downloads/logos/bitnami-mark.png
@@ -23,4 +23,4 @@ name: common
 sources:
   - https://github.com/bitnami/charts
 type: library
-version: 2.10.1
+version: 2.11.0

bitnami/common/templates/_images.tpl

@@ -83,3 +83,19 @@ imagePullSecrets:
     {{- end }}
   {{- end }}
 {{- end -}}
+
+{{/*
+Return the proper image version (ingores image revision/prerelease info & fallbacks to chart appVersion)
+{{ include "common.images.version" ( dict "imageRoot" .Values.path.to.the.image "chart" .Chart ) }}
+*/}}
+{{- define "common.images.version" -}}
+{{- $imageTag := .imageRoot.tag | toString -}}
+{{/* regexp from https://github.com/Masterminds/semver/blob/23f51de38a0866c5ef0bfc42b3f735c73107b700/version.go#L41-L44 */}}
+{{- if regexMatch `^([0-9]+)(\.[0-9]+)?(\.[0-9]+)?(-([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?(\+([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?$` $imageTag -}}
+    {{- $version := semver $imageTag -}}
+    {{- printf "%d.%d.%d" $version.Major $version.Minor $version.Patch -}}
+{{- else -}}
+    {{- print .chart.AppVersion -}}
+{{- end -}}
+{{- end -}}
+