allow monocular home dir to be configurable (#268)

* allow monocular home dir to be configurable

* update chart

deployment/monocular/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 name: monocular
 description: Monocular is a search and discovery front end for Helm Charts Repositories.
-version: 0.3.0
+version: 0.4.0
 appVersion: 0.2.0
 home: https://github.com/helm/monocular
 sources:

deployment/monocular/templates/api-deployment.yaml

@@ -17,6 +17,9 @@ spec:
       - name: {{ .Chart.Name }}
         image: "{{ .Values.api.image.repository }}:{{ .Values.api.image.tag }}"
         imagePullPolicy: {{ .Values.api.image.pullPolicy }}
+        env:
+        - name: MONOCULAR_HOME
+          value: /monocular
         ports:
         - containerPort: {{ .Values.api.service.internalPort }}
         livenessProbe:
@@ -32,11 +35,15 @@ spec:
           initialDelaySeconds: 30
           timeoutSeconds: 5
         volumeMounts:
+          - name: cache
+            mountPath: /monocular
           - name: config
-            mountPath: /root/monocular/config
+            mountPath: /monocular/config
         resources:
 {{ toYaml .Values.api.resources | indent 12 }}
       volumes:
       - name: config
         configMap:
           name: {{ template "fullname" . }}-api-config
+      - name: cache
+        emptyDir: {}

src/api/config/config.go

@@ -71,6 +71,10 @@ func GetConfig() (Configuration, error) {
 // BaseDir returns the location of the directory
 // where the configuration files are stored
 func BaseDir() string {
+	if basedir, ok := os.LookupEnv("MONOCULAR_HOME"); ok {
+		return basedir
+	}
+
 	return filepath.Join(os.Getenv("HOME"), "monocular")
 }
 

src/api/config/config_test.go

@@ -72,6 +72,20 @@ func TestBaseDir(t *testing.T) {
 	assert.Equal(t, BaseDir(), path, "BaseDir uses home + monocular")
 }
 
+func TestBaseDirWithEnvVar(t *testing.T) {
+	path := "/path/to/monocular/home"
+	os.Setenv("MONOCULAR_HOME", path)
+	defer func() { os.Unsetenv("MONOCULAR_HOME") }()
+	assert.Equal(t, BaseDir(), path, "BaseDir uses MONOCULAR_HOME value")
+}
+
+func TestBaseDirWithEmptyEnvVar(t *testing.T) {
+	path := ""
+	os.Setenv("MONOCULAR_HOME", path)
+	defer func() { os.Unsetenv("MONOCULAR_HOME") }()
+	assert.Equal(t, BaseDir(), path, "BaseDir uses MONOCULAR_HOME value")
+}
+
 func TestConfigFile(t *testing.T) {
 	path := filepath.Join(BaseDir(), "config", "monocular.yaml")
 	assert.Equal(t, configFile(), path, "Config file = BaseDir + config + monocular.yaml")