Fix SIGSEGV when storage driver returns nil error (#3625)

pkg/tiller/release_server.go

@@ -202,15 +202,28 @@ func (s *ReleaseServer) uniqName(start string, reuse bool) (string, error) {
 		return "", fmt.Errorf("a release named %s already exists.\nRun: helm ls --all %s; to check the status of the release\nOr run: helm del --purge %s; to delete it", start, start, start)
 	}
 
+	moniker := moniker.New()
+	newname, err := s.createUniqName(moniker)
+	if err != nil {
+		return "ERROR", err
+	}
+
+	s.Log("info: Created new release name %s", newname)
+	return newname, nil
+
+}
+
+func (s *ReleaseServer) createUniqName(m moniker.Namer) (string, error) {
 	maxTries := 5
 	for i := 0; i < maxTries; i++ {
-		namer := moniker.New()
-		name := namer.NameSep("-")
+		name := m.NameSep("-")
 		if len(name) > releaseNameMaxLen {
 			name = name[:releaseNameMaxLen]
 		}
-		if _, err := s.env.Releases.Get(name, 1); strings.Contains(err.Error(), "not found") {
-			return name, nil
+		if _, err := s.env.Releases.Get(name, 1); err != nil {
+			if strings.Contains(err.Error(), "not found") {
+				return name, nil
+			}
 		}
 		s.Log("info: generated name %s is taken. Searching again.", name)
 	}

pkg/tiller/release_server_test.go

@@ -28,6 +28,7 @@ import (
 
 	"github.com/ghodss/yaml"
 	"github.com/golang/protobuf/ptypes/timestamp"
+	"github.com/technosophos/moniker"
 	"golang.org/x/net/context"
 	"google.golang.org/grpc/metadata"
 	"k8s.io/kubernetes/pkg/apis/core"
@@ -380,6 +381,62 @@ func TestUniqName(t *testing.T) {
 	}
 }
 
+type fakeNamer struct {
+	name string
+}
+
+func NewFakeNamer(nam string) moniker.Namer {
+	return &fakeNamer{
+		name: nam,
+	}
+}
+
+func (f *fakeNamer) Name() string {
+	return f.NameSep(" ")
+}
+
+func (f *fakeNamer) NameSep(sep string) string {
+	return f.name
+}
+
+func TestCreateUniqueName(t *testing.T) {
+	rs := rsFixture()
+
+	rel1 := releaseStub()
+	rel1.Name = "happy-panda"
+
+	rs.env.Releases.Create(rel1)
+
+	tests := []struct {
+		name   string
+		expect string
+		err    bool
+	}{
+		{"happy-panda", "ERROR", true},
+		{"wobbly-octopus", "[a-z]+-[a-z]+", false},
+	}
+
+	for _, tt := range tests {
+		m := NewFakeNamer(tt.name)
+		u, err := rs.createUniqName(m)
+		if err != nil {
+			if tt.err {
+				continue
+			}
+			t.Fatal(err)
+		}
+		if tt.err {
+			t.Errorf("Expected an error for %q", tt.name)
+		}
+		if match, err := regexp.MatchString(tt.expect, u); err != nil {
+			t.Fatal(err)
+		} else if !match {
+			t.Errorf("Expected %q to match %q", u, tt.expect)
+		}
+	}
+
+}
+
 func releaseWithKeepStub(rlsName string) *release.Release {
 	ch := &chart.Chart{
 		Metadata: &chart.Metadata{