fi(helm): add more tests for plugins

This adds tests for setupEnv, and also updates some documentation to
mirror the current state of plugins.

cmd/helm/plugins.go

@@ -173,10 +173,14 @@ func setupEnv(shortname, base, plugdirs string, home helmpath.Home) {
 		"HELM_PATH_REPOSITORY_FILE":  home.RepositoryFile(),
 		"HELM_PATH_CACHE":            home.Cache(),
 		"HELM_PATH_LOCAL_REPOSITORY": home.LocalRepository(),
-		//"HELM_PATH_STARTER":          home.Starter(),
+		"HELM_PATH_STARTER":          home.Starters(),
 
 		"TILLER_HOST": tillerHost,
 	} {
 		os.Setenv(key, val)
 	}
+
+	if flagDebug {
+		os.Setenv("HELM_DEBUG", "1")
+	}
 }

cmd/helm/plugins_test.go

@@ -18,6 +18,7 @@ package main
 import (
 	"bytes"
 	"os"
+	"path/filepath"
 	"strings"
 	"testing"
 
@@ -123,3 +124,36 @@ func TestLoadPlugins(t *testing.T) {
 		}
 	}
 }
+
+func TestSetupEnv(t *testing.T) {
+	name := "pequod"
+	hh := helmpath.Home("testdata/helmhome")
+	base := filepath.Join(hh.Plugins(), name)
+	plugdirs := hh.Plugins()
+	flagDebug = true
+	defer func() {
+		flagDebug = false
+	}()
+
+	setupEnv(name, base, plugdirs, hh)
+	for _, tt := range []struct {
+		name   string
+		expect string
+	}{
+		{"HELM_PLUGIN_NAME", name},
+		{"HELM_PLUGIN_DIR", base},
+		{"HELM_PLUGIN", hh.Plugins()},
+		{"HELM_DEBUG", "1"},
+		{"HELM_HOME", hh.String()},
+		{"HELM_PATH_REPOSITORY", hh.Repository()},
+		{"HELM_PATH_REPOSITORY_FILE", hh.RepositoryFile()},
+		{"HELM_PATH_CACHE", hh.Cache()},
+		{"HELM_PATH_LOCAL_REPOSITORY", hh.LocalRepository()},
+		{"HELM_PATH_STARTER", hh.Starters()},
+		{"TILLER_HOST", tillerHost},
+	} {
+		if got := os.Getenv(tt.name); got != tt.expect {
+			t.Errorf("Expected $%s=%q, got %q", tt.name, tt.expect, got)
+		}
+	}
+}

docs/plugins.md

@@ -159,18 +159,15 @@ to use the tunnel.
 
 ## A Note on Flag Parsing
 
-When executing a plugin, Helm will parse global flags for its own use, but pass
-all flags to the plugin.
+When executing a plugin, Helm will parse global flags for its own use. Some of
+these flags are _not_ passed on to the plugin.
 
-Plugins MUST NOT produce an error for the following flags:
-
-- `--debug`
-- `--home`
-- `--host`
-- `--kube-context`
-- `-h`
-- `--help`
+- `--debug`: If this is specified, `$HELM_DEBUG` is set to `1`
+- `--home`: This is converted to `$HELM_HOME`
+- `--host`: This is convereted to `$HELM_HOST`
+- `--kube-context`: This is simply dropped. If your plugin uses `useTunnel`, this
+  is used to set up the tunnel for you.
 
 Plugins _should_ display help text and then exit for `-h` and `--help`. In all
-other cases, plugins may simply ignore the flags.
+other cases, plugins may use flags as appropriate.