Return a proper error if phase document was not found

Change-Id: I0b3b7a819b6c76fdc2e20ee2f6f8ece047fac858
Relates-To: #257
Closes: #257
Signed-off-by: Ruslan Aliev <raliev@mirantis.com>

pkg/config/config.go

@@ -732,11 +732,11 @@ func (c *Config) CurrentContextEntryPoint(phase string) (string, error) {
 	if !exists {
 		return "", ErrMissingPrimaryRepo{}
 	}
-	return path.Join(
-		ccm.TargetPath,
-		ccm.SubPath,
-		clusterType,
-		phase), nil
+	epp := path.Join(ccm.TargetPath, ccm.SubPath, clusterType, phase)
+	if _, err := os.Stat(epp); err != nil {
+		return "", ErrMissingPhaseDocument{PhaseName: phase}
+	}
+	return epp, nil
 }
 
 // CurrentContextTargetPath returns target path from current context's manifest

pkg/config/config_test.go

@@ -511,7 +511,7 @@ func TestCurrentContextEntryPoint(t *testing.T) {
 	conf.Contexts[currentContextName].KubeContext().Cluster = clusterName
 
 	entryPoint, err = conf.CurrentContextEntryPoint(defaultString)
-	require.NoError(t, err)
+	assert.Equal(t, config.ErrMissingPhaseDocument{PhaseName: defaultString}, err)
 	assert.Nil(t, nil, entryPoint)
 }
 

pkg/config/errors.go

@@ -179,6 +179,16 @@ func (e ErrMissingPrimaryRepo) Error() string {
 	return "Current context manifest must have a primary repository set."
 }
 
+// ErrMissingPhaseDocument returned when appropriate Phase document was not found in the filesystem
+type ErrMissingPhaseDocument struct {
+	PhaseName string
+}
+
+func (e ErrMissingPhaseDocument) Error() string {
+	return fmt.Sprintf("Phase document '%s' was not found. "+
+		"You can initialize it using 'airshipctl document init %s' command.", e.PhaseName, e.PhaseName)
+}
+
 // ErrConflictingAuthOptions returned in case both token and username/password is set at same time
 type ErrConflictingAuthOptions struct {
 }