Unifity environment variable naming and use

Signed-off-by: Matt Farina <matt@mattfarina.com>

cmd/helm/testdata/helmhome/helm/plugins/fullenv/fullenv.sh

@@ -2,6 +2,6 @@
 echo $HELM_PLUGIN_NAME
 echo $HELM_PLUGIN_DIR
 echo $HELM_PLUGIN
-echo $HELM_PATH_REPOSITORY_FILE
+echo $HELM_REPOSITORY_CONFIG
-echo $HELM_PATH_REPOSITORY_CACHE
+echo $HELM_REPOSITORY_CACHE
 echo $HELM_BIN

pkg/cli/environment.go

@@ -103,8 +103,8 @@ func (s *EnvSettings) setHelmEnvVars() {
 		"HELM_PATH_STARTER":      helmpath.DataPath("starters"),
 		"HELM_DEBUG":             fmt.Sprint(s.Debug),
 		"HELM_REGISTRY_CONFIG":   s.RegistryConfig,
-		"HELM_PATH_REPOSITORY_FILE":  s.RepositoryConfig,
+		"HELM_REPOSITORY_CONFIG": s.RepositoryConfig,
-		"HELM_PATH_REPOSITORY_CACHE": s.RepositoryCache,
+		"HELM_REPOSITORY_CACHE":  s.RepositoryCache,
 		"HELM_PLUGIN":            s.PluginsDirectory,
 		xdg.CacheHomeEnvVar:      helmpath.CachePath(),
 		xdg.ConfigHomeEnvVar:     helmpath.ConfigPath(),

pkg/plugin/plugin.go

@@ -224,8 +224,9 @@ func SetupPluginEnv(settings *cli.EnvSettings, name, base string) {
 		"HELM_PLUGIN":      settings.PluginsDirectory,
 
 		// Set vars that convey common information.
-		"HELM_PATH_REPOSITORY_FILE":  settings.RepositoryConfig,
+		"HELM_REGISTRY_CONFIG":   settings.RegistryConfig,
-		"HELM_PATH_REPOSITORY_CACHE": settings.RepositoryCache,
+		"HELM_REPOSITORY_CONFIG": settings.RepositoryConfig,
+		"HELM_REPOSITORY_CACHE":  settings.RepositoryCache,
 		"HELM_PATH_STARTER":      helmpath.DataPath("starters"),
 		"HELM_HOME":              helmpath.DataPath(), // for backwards compatibility with Helm 2 plugins
 		"HELM_DEBUG":             fmt.Sprint(settings.Debug),