support labels for namespace and chart (#459)

README.md

@@ -295,6 +295,8 @@ The `selector` parameter can be specified multiple times. Each parameter is reso
 
 `--selector tier=frontend --selector tier=backend` will select all the charts
 
+In addition to user supplied labels the name, namespace, and chart are available to be used as selectors.  The chart will just be the chart name excluding the repository (Example `stable/filebeat` would be selected using `--selector chart=filebeat`).
+
 ## Templates
 
 You can use go's text/template expressions in `helmfile.yaml` and `values.yaml.gotmpl` (templated helm values files). `values.yaml` references will be used verbatim. In other words:

state/state.go

@@ -3,7 +3,6 @@ package state
 import (
 	"errors"
 	"fmt"
-	"github.com/roboll/helmfile/helmexec"
 	"io/ioutil"
 	"os"
 	"path"
@@ -12,6 +11,8 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/roboll/helmfile/helmexec"
+
 	"regexp"
 
 	"os/exec"
@@ -747,8 +748,12 @@ func (st *HelmState) FilterReleases(labels []string) error {
 		if r.Labels == nil {
 			r.Labels = map[string]string{}
 		}
-		// Let the release name be used as a tag
+		// Let the release name, namespace, and chart be used as a tag
 		r.Labels["name"] = r.Name
+		r.Labels["namespace"] = r.Namespace
+		// Strip off just the last portion for the name stable/newrelic would give newrelic
+		chartSplit := strings.Split(r.Chart, "/")
+		r.Labels["chart"] = chartSplit[len(chartSplit)-1]
 		for _, f := range filters {
 			if r.Labels == nil {
 				r.Labels = map[string]string{}