From c2ed155e667fad48c80593beb63543be636da958 Mon Sep 17 00:00:00 2001
From: Bryton Hall <email@bryton.io>
Date: Thu, 1 Dec 2022 20:41:18 -0500
Subject: [PATCH] helm: only upgrade when there are changes

---
 pkgs/kubenix.nix | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/pkgs/kubenix.nix b/pkgs/kubenix.nix
index e7d6fdb..904fefd 100644
--- a/pkgs/kubenix.nix
+++ b/pkgs/kubenix.nix
@@ -31,11 +31,20 @@ writeShellScriptBin "kubenix" ''
       values=$(mktemp)
       echo "$release" | jq -r '.values' | ${vals}/bin/vals eval > $values
 
-      ${kubernetes-helm}/bin/helm $@ \
-        -n $(echo "$release" | jq -r '.namespace // "default"') \
-        $(echo "$release" | jq -r '.name') \
-        $(echo "$release" | jq -r '.chart') \
-        -f $values
+      name=$(echo "$release" | jq -r '.name')
+      chart=$(echo "$release" | jq -r '.chart')
+      namespace=$(echo "$release" | jq -r '.namespace // "default"')
+
+      args="-n $namespace $name $chart -f $values"
+
+      # only apply when there are changes
+      if [[ "$1" == "upgrade" ]]; then
+        if ${kubernetes-helm}/bin/helm diff upgrade $args --allow-unreleased --detailed-exitcode 2> /dev/null; then
+           continue
+        fi
+      fi
+
+      ${kubernetes-helm}/bin/helm $@ $args
     done
   }