From 5d6b8f4b12e33e43f955fdb99754361ef71af76b Mon Sep 17 00:00:00 2001
From: Florian Piesche <florian@yellowkeycard.net>
Date: Wed, 11 Aug 2021 16:36:39 +0100
Subject: [PATCH] [Charts] Add option to pass in topology pod constraints
 (#262)

---
 charts/woodpecker-agent/Chart.yaml                |  4 ++--
 charts/woodpecker-agent/templates/deployment.yaml |  6 ++++++
 charts/woodpecker-agent/values.yaml               | 12 ++++++++++++
 3 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/charts/woodpecker-agent/Chart.yaml b/charts/woodpecker-agent/Chart.yaml
index c71bbf1fa..007480115 100644
--- a/charts/woodpecker-agent/Chart.yaml
+++ b/charts/woodpecker-agent/Chart.yaml
@@ -1,8 +1,8 @@
 apiVersion: v2
 name: woodpecker-agent
-description: A Helm chart for Woodpecker a fork of the Drone CI system
+description: A Helm chart for Woodpecker, a fork of the Drone CI system
 type: application
-version: 0.1.0
+version: 0.1.1
 appVersion: "v0.13.0-rc.3"
 keywords:
 - continuous-delivery
diff --git a/charts/woodpecker-agent/templates/deployment.yaml b/charts/woodpecker-agent/templates/deployment.yaml
index f4f615437..8271fdc24 100644
--- a/charts/woodpecker-agent/templates/deployment.yaml
+++ b/charts/woodpecker-agent/templates/deployment.yaml
@@ -18,6 +18,12 @@ spec:
       labels:
         {{- include "woodpecker-agent.selectorLabels" . | nindent 8 }}
     spec:
+      {{- if and (semverCompare ">=1.19-0" .Capabilities.KubeVersion.GitVersion) (.Values.topologySpreadConstraints) }}
+      {{- with .Values.topologySpreadConstraints }}
+      topologySpreadConstraints:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- end }}
       {{- with .Values.imagePullSecrets }}
       imagePullSecrets:
         {{- toYaml . | nindent 8 }}
diff --git a/charts/woodpecker-agent/values.yaml b/charts/woodpecker-agent/values.yaml
index ac7ce060b..3071157f3 100644
--- a/charts/woodpecker-agent/values.yaml
+++ b/charts/woodpecker-agent/values.yaml
@@ -56,3 +56,15 @@ nodeSelector: {}
 tolerations: []
 
 affinity: {}
+
+## Using topology spread constraints, you can ensure that there is at least one agent
+## pod for each topology zone, e.g. one per arch for for multi-architecture clusters
+## or one for each region for geographically distributed cloud-hosted clusters.
+## Ref: https://kubernetes.io/docs/concepts/workloads/pods/pod-topology-spread-constraints/
+topologySpreadConstraints: []
+# - maxSkew: 1
+#   topologyKey: "beta.kubernetes.io/arch"
+#   whenUnsatisfiable: "DoNotSchedule"
+#   labelSelector:
+#     matchLabels:
+#       "app.kubernetes.io/name": woodpecker-agent