Fix for checking helm version slice bounds out of range (#4609)

* fix(helm): Use env to locate bash

Leverage '/usr/bin/env bash` for find bash instead of hardcoding
'/bin/bash' since some *nix OSes have it installed elsewhere.
Signed-off-by: Robert James Hernandez <rob@sarcasticadmin.com>

* test(helm): Adding case for versions short flag

When git sha is empty if being built from tarball running 'helm version
--short' should just ignore '--short' since sha is empty. Adding test
to ensure this is the case.
Signed-off-by: Robert James Hernandez <rob@sarcasticadmin.com>

* fix(helm): ignore short flag when sha is empty
Signed-off-by: Robert James Hernandez <rob@sarcasticadmin.com>

Makefile

@@ -18,7 +18,7 @@ BINDIR    := $(CURDIR)/bin
 BINARIES  := helm tiller
 
 # Required for globs to work correctly
-SHELL=/bin/bash
+SHELL=/usr/bin/env bash
 
 .PHONY: all
 all: build

cmd/helm/version.go

@@ -145,7 +145,7 @@ func getK8sVersion() (*apiVersion.Info, error) {
 }
 
 func formatVersion(v *pb.Version, short bool) string {
-	if short {
+	if short && v.GitCommit != "" {
 		return fmt.Sprintf("%s+g%s", v.SemVer, v.GitCommit[:7])
 	}
 	return fmt.Sprintf("%#v", v)

cmd/helm/version_test.go

@@ -57,6 +57,12 @@ func TestVersion(t *testing.T) {
 			flags:    []string{"--template", "{{ .Client.SemVer }} {{ .Server.SemVer }}"},
 			expected: lver + " " + sver,
 		},
+		{
+			name:     "client short empty git",
+			args:     []string{},
+			flags:    []string{"-c", "--short"},
+			expected: lver,
+		},
 	}
 	settings.TillerHost = "fake-localhost"
 	runReleaseCases(t, tests, func(c *helm.FakeClient, out io.Writer) *cobra.Command {