Add arbitrary labels to docker images

api/swagger-spec/oapi-v1.json

@@ -22071,6 +22071,30 @@
      "pushSecret": {
       "$ref": "v1.LocalObjectReference",
       "description": "PushSecret is the name of a Secret that would be used for setting up the authentication for executing the Docker push to authentication enabled Docker Registry (or Docker Hub)."
+     },
+     "imageLabels": {
+      "type": "array",
+      "items": {
+       "$ref": "v1.ImageLabel"
+      },
+      "description": "imageLabels define a list of labels that are applied to the resulting image. If there are multiple labels with the same name then the last one in the list is used."
+     }
+    }
+   },
+   "v1.ImageLabel": {
+    "id": "v1.ImageLabel",
+    "description": "ImageLabel represents a label applied to the resulting image.",
+    "required": [
+     "name"
+    ],
+    "properties": {
+     "name": {
+      "type": "string",
+      "description": "name defines the name of the label. It must have non-zero length."
+     },
+     "value": {
+      "type": "string",
+      "description": "value defines the literal value of the label."
      }
     }
    },

api/swagger-spec/openshift-openapi-spec.json

@@ -44770,6 +44770,13 @@
    "v1.BuildOutput": {
     "description": "BuildOutput is input to a build strategy and describes the Docker image that the strategy should produce.",
     "properties": {
+     "imageLabels": {
+      "description": "imageLabels define a list of labels that are applied to the resulting image. If there are multiple labels with the same name then the last one in the list is used.",
+      "type": "array",
+      "items": {
+       "$ref": "#/definitions/v1.ImageLabel"
+      }
+     },
      "pushSecret": {
       "$ref": "#/definitions/v1.LocalObjectReference"
      },
@@ -47742,6 +47749,22 @@
      }
     }
    },
+   "v1.ImageLabel": {
+    "description": "ImageLabel represents a label applied to the resulting image.",
+    "required": [
+     "name"
+    ],
+    "properties": {
+     "name": {
+      "description": "name defines the name of the label. It must have non-zero length.",
+      "type": "string"
+     },
+     "value": {
+      "description": "value defines the literal value of the label.",
+      "type": "string"
+     }
+    }
+   },
    "v1.ImageLayer": {
     "description": "ImageLayer represents a single layer of the image. Some images may have multiple layers. Some may have none.",
     "required": [

pkg/build/admission/defaults/admission.go

@@ -88,6 +88,12 @@ func (a *buildDefaults) applyBuildDefaults(build *buildapi.Build) {
 		addDefaultEnvVar(envVar, buildEnv)
 	}
 
+	// Apply default labels
+	for _, lbl := range a.defaultsConfig.ImageLabels {
+		glog.V(5).Infof("Adding default image label %s=%s to build %s/%s", lbl.Name, lbl.Value, build.Namespace, build.Name)
+		addDefaultLabel(lbl, &build.Spec.Output.ImageLabels)
+	}
+
 	sourceDefaults := a.defaultsConfig.SourceStrategyDefaults
 	sourceStrategy := build.Spec.Strategy.SourceStrategy
 	if sourceDefaults != nil && sourceDefaults.Incremental != nil && *sourceDefaults.Incremental &&
@@ -153,3 +159,15 @@ func addDefaultEnvVar(v kapi.EnvVar, envVars *[]kapi.EnvVar) {
 		*envVars = append(*envVars, v)
 	}
 }
+
+func addDefaultLabel(defaultLabel buildapi.ImageLabel, buildLabels *[]buildapi.ImageLabel) {
+	found := false
+	for _, lbl := range *buildLabels {
+		if lbl.Name == defaultLabel.Name {
+			found = true
+		}
+	}
+	if !found {
+		*buildLabels = append(*buildLabels, defaultLabel)
+	}
+}