add support for extraVolumes and extraMounts

populate volumes and mounts from value keys
adds logprep-cache-dir in memory volume and mounts it to
/home/logprep/.cache

charts/logprep/templates/deployment.yaml

@@ -76,6 +76,8 @@ spec:
               mountPath: /tmp
             - name: prometheus-multiproc
               mountPath: /prometheus
+            - name: logprep-cache-dir
+              mountPath: /home/logprep/.cache
             {{- range $key, $value := .Values.configurations }}
             {{- if $value.data }}
             - name: configurations
@@ -107,6 +109,9 @@ spec:
               subPath: {{ $value.name }}
             {{ end }}
             {{- end }}
+            {{- if .Values.extraMounts }}
+            {{- toYaml .Values.extraMounts | nindent 12 }}
+            {{- end }}
           {{- if or .Values.exporter.enabled (eq .Values.input.type "http_input") }}
           {{- if eq .Values.input.type "http_input" }}
           readinessProbe:
@@ -150,6 +155,9 @@ spec:
         - name: prometheus-multiproc
           emptyDir:
             medium: "Memory"
+        - name: logprep-cache-dir
+          emptyDir:
+            medium: "Memory"
         - name: configurations
           configMap:
             name: {{ include "logprep.fullname" . }}-configurations
@@ -177,6 +185,9 @@ spec:
             secretName: {{ $value.name }}
         {{- end }}
         {{- end }}
+        {{- if .Values.extraVolumes }}
+        {{- toYaml .Values.extraVolumes | nindent 8 }}
+        {{- end }}
       {{- if .Values.affinity }}
       affinity:
         podAntiAffinity:

charts/logprep/values.yaml

@@ -63,6 +63,21 @@ affinity: false
 # inject extra labels to all resources metadata
 extraLabels: {}
 
+# extraVolumes to populate the pod with
+# Example:
+# extraVolumes:
+#   - name: my-volume
+#     configMap:
+#       name: my-configmap
+extraVolumes: []
+
+# extraMounts to populate the pod with
+# Example:
+# extraMounts:
+#   - name: my-volume
+#     mountPath: /path/to/mount
+extraMounts: []
+
 # Use this to annotate the logprep pods
 # podAnnotations:
 #   sidecar.istio.io/rewriteAppHTTPProbers: "false"

tests/unit/charts/test_deployment.py

@@ -439,3 +439,54 @@ def test_environment_variables_populated_from_secrets(self):
         assert my_var["value"] == "my_value"
         my_var = [variable for variable in env if variable["name"] == "MY_OTHER_VAR"].pop()
         assert my_var["valueFrom"]["secretKeyRef"]["name"] == "my-secret"
+
+    def test_extra_volumes_are_populated(self):
+        logprep_values = {
+            "extraVolumes": [
+                {
+                    "name": "my-volume",
+                    "configMap": {"name": "my-configmap"},
+                },
+                {
+                    "name": "my-volume2",
+                    "configMap": {"name": "my-configmap"},
+                },
+            ]
+        }
+        self.manifests = self.render_chart("logprep", logprep_values)
+        volumes = self.deployment["spec.template.spec.volumes"]
+        volume = [volume for volume in volumes if volume["name"] == "my-volume"].pop()
+        assert volume["configMap"]["name"] == "my-configmap"
+
+    def test_extra_mounts_are_populated(self):
+        logprep_values = {
+            "extraMounts": [
+                {
+                    "name": "my-volume",
+                    "mountPath": "/my-path",
+                },
+                {
+                    "name": "my-volume2",
+                    "mountPath": "/my-path2",
+                    "subPath": "sub-path",
+                },
+            ]
+        }
+        self.manifests = self.render_chart("logprep", logprep_values)
+        mounts = self.deployment["spec.template.spec.containers.0.volumeMounts"]
+        mount = [mount for mount in mounts if mount["name"] == "my-volume"].pop()
+        assert mount["mountPath"] == "/my-path"
+        mount = [mount for mount in mounts if mount["name"] == "my-volume2"].pop()
+        assert mount["subPath"] == "sub-path"
+
+    def test_logprep_cache_dir_is_populated(self):
+        volumes = self.deployment["spec.template.spec.volumes"]
+        cache_dir_volume = [
+            volume for volume in volumes if volume["name"] == "logprep-cache-dir"
+        ].pop()
+        assert cache_dir_volume
+        assert cache_dir_volume["emptyDir"] == {"medium": "Memory"}
+        mounts = self.deployment["spec.template.spec.containers.0.volumeMounts"]
+        cache_dir_mount = [mount for mount in mounts if mount["name"] == "logprep-cache-dir"].pop()
+        assert cache_dir_mount
+        assert cache_dir_mount["mountPath"] == "/home/logprep/.cache"