Fix PodDisruptionBudget template (#88)

* Fix bad selectors.
* Fix bad calculation of maxUnavailable.

Signed-off-by: JrCs <90z7oey02@sneakemail.com>

templates/_helpers.tpl

@@ -42,7 +42,7 @@ Add a special case for replicas=1, where it should default to 0 as well.
 {{- else if .Values.server.ha.disruptionBudget.maxUnavailable -}}
 {{ .Values.server.ha.disruptionBudget.maxUnavailable -}}
 {{- else -}}
-{{- ceil (sub (div (int .Values.server.ha.replicas) 2) 1) -}}
+{{- div (sub (div (mul (int .Values.server.ha.replicas) 10) 2) 1) 10 -}}
 {{- end -}}
 {{- end -}}
 

templates/server-disruptionbudget.yaml

@@ -16,7 +16,7 @@ spec:
   maxUnavailable: {{ template "vault.pdb.maxUnavailable" . }}
   selector:
     matchLabels:
-      app: {{ template "vault.name" . }}
-      release: "{{ .Release.Name }}"
+      app.kubernetes.io/name: {{ include "vault.name" . }}
+      app.kubernetes.io/instance: {{ .Release.Name }}
       component: server
 {{- end -}}

test/unit/server-ha-disruptionbudget.bats

@@ -43,6 +43,17 @@ load _helpers
   [ "${actual}" = "false" ]
 }
 
+@test "server/DisruptionBudget: correct maxUnavailable with n=1" {
+  cd `chart_dir`
+  local actual=$(helm template \
+      -x templates/server-disruptionbudget.yaml  \
+      --set 'server.ha.enabled=true' \
+      --set 'server.ha.replicas=1' \
+      . | tee /dev/stderr |
+      yq '.spec.maxUnavailable' | tee /dev/stderr)
+  [ "${actual}" = "0" ]
+}
+
 @test "server/DisruptionBudget: correct maxUnavailable with n=3" {
   cd `chart_dir`
   local actual=$(helm template \
@@ -51,5 +62,16 @@ load _helpers
       --set 'server.ha.replicas=3' \
       . | tee /dev/stderr |
       yq '.spec.maxUnavailable' | tee /dev/stderr)
-  [ "${actual}" = "0" ]
+  [ "${actual}" = "1" ]
+}
+
+@test "server/DisruptionBudget: correct maxUnavailable with n=5" {
+  cd `chart_dir`
+  local actual=$(helm template \
+      -x templates/server-disruptionbudget.yaml  \
+      --set 'server.ha.enabled=true' \
+      --set 'server.ha.replicas=5' \
+      . | tee /dev/stderr |
+      yq '.spec.maxUnavailable' | tee /dev/stderr)
+  [ "${actual}" = "2" ]
 }