Fall back to wildcard context configuration when no exact match is found

Signed-off-by: Cornelius Weig <22861411+corneliusweig@users.noreply.github.com>

cmd/skaffold/app/cmd/config.go

@@ -54,6 +54,7 @@ func NewCmdSetKubeContext() *cobra.Command {
 		WithDescription("Set a default kube-context for a named skaffold.yaml").
 		WithExample("Use given kube-context when running current skaffold.yaml", "config set default-context <kube-context>").
 		WithExample("Use given kube-context for config with the given metadata.name", "config set default-context --skaffold-config <name> <kube-context>").
+		WithExample("Use given kube-context for every config", "config set default-context --global <kube-context>").
 		WithFlags(func(f *pflag.FlagSet) {
 			config.AddSetKubeconfigFlags(f)
 		}).
@@ -77,6 +78,7 @@ func NewCmdUnsetKubeContext() *cobra.Command {
 		WithDescription("Unset a default kube-context for a named skaffold.yaml").
 		WithExample("Unset the default kube-context for skaffold.yaml", "config unset default-context").
 		WithExample("Unset the default kube-context for config with the given metadata.name", "config unset default-context --skaffold-config <name>").
+		WithExample("Unset the wildcard default kube-context", "config unset default-context --global").
 		WithFlags(func(f *pflag.FlagSet) {
 			config.AddSetKubeconfigFlags(f)
 		}).

pkg/skaffold/config/util.go

@@ -36,6 +36,7 @@ import (
 const (
 	defaultConfigDir  = ".skaffold"
 	defaultConfigFile = "config"
+	wildcardContext   = "*"
 )
 
 var (
@@ -196,6 +197,10 @@ func GetKubeContext(configFile, skaffoldConfigName, cliValue string) (string, er
 		return kubecontext, nil
 	}
 
+	if kubecontext, ok := cfg.SkaffoldConfigs[wildcardContext]; ok {
+		return kubecontext, nil
+	}
+
 	return "", nil
 }
 

pkg/skaffold/config/util_test.go

@@ -217,7 +217,7 @@ func Test_getConfigForKubeContextWithGlobalDefaults(t *testing.T) {
 	}
 }
 
-func TestResolveDefaultKubeContext(t *testing.T) {
+func TestGetKubeContext(t *testing.T) {
 	const (
 		someKubeContext    = "this_is_a_context"
 		skaffoldConfigName = "skaffold-config-name"
@@ -235,15 +235,21 @@ func TestResolveDefaultKubeContext(t *testing.T) {
 			contextCLI: someKubeContext,
 			configName: skaffoldConfigName,
 			cfg: &GlobalConfig{
-				SkaffoldConfigs: map[string]string{skaffoldConfigName: "other_context"},
+				SkaffoldConfigs: map[string]string{
+					skaffoldConfigName: "other_context",
+					wildcardContext:    "yet_another_context",
+				},
 			},
 			expectedContext: someKubeContext,
 		},
 		{
 			name:       "when mapping is found",
 			configName: skaffoldConfigName,
 			cfg: &GlobalConfig{
-				SkaffoldConfigs: map[string]string{skaffoldConfigName: someKubeContext},
+				SkaffoldConfigs: map[string]string{
+					skaffoldConfigName: someKubeContext,
+					wildcardContext:    "yet_another_context",
+				},
 			},
 			expectedContext: someKubeContext,
 		},
@@ -255,6 +261,17 @@ func TestResolveDefaultKubeContext(t *testing.T) {
 			},
 			expectedContext: "",
 		},
+		{
+			name:       "fall back to wildcard context",
+			configName: skaffoldConfigName,
+			cfg: &GlobalConfig{
+				SkaffoldConfigs: map[string]string{
+					"other-config-name": "yet_another_context",
+					wildcardContext:     someKubeContext,
+				},
+			},
+			expectedContext: someKubeContext,
+		},
 		{
 			name:            "when SkaffoldConfigs is not set",
 			configName:      skaffoldConfigName,