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content/posts/argocd-dynamic-environment-per-branch-part-1/index.md

@@ -376,6 +376,49 @@ And now let's create a job like that:
     - argocd app wait -l app=badhouseplants -l branch=$DRONE_BRANCH
 ```
 
-And the last step would be to remove an application when branch is removed. 
+And the last step would be to remove an application when branch is removed. It could be easy with `Gitlab` because there you can use `environments` and `triggers` for removing branch *(as I remember)* But with drone it can be harder. Because drone won't be triggered by a removed branch. So I has to be an additional step for the `main` pipeline. 
+
+I'm always using squash commits that means that after merging a Pull Request the commit will have the same `SHA`. So when merging to the main branch, I can use the commit hash to remove a generator.
+
+So I've created a file `./kube/main-template.yaml`, that looks like that:
+```YAML
+- name: application
+  app: badhouseplants
+  branch: main
+  chart_version: $ARGO_APP_CHART_VERSION
+  value: |
+    hugo:
+      image:
+        tag: $ARGO_APP_IMAGE_TAG
+```
+
+And a job:
+```YAML
+- name: Deploy a main ApplicationSet
+  image: alpine/k8s:1.24.10
+  when: 
+    branch:
+      - main
+  environment:
+    KUBECONFIG_CONTENT:
+      from_secret: KUBECONFIG_CONTENT
+  commands: 
+    - mkdir $HOME/.kube
+    - echo $KUBECONFIG_CONTENT | base64 -d > $HOME/.kube/config
+    - apk update --no-cache && apk add yq gettext
+    - export ARGO_APP_CHART_VERSION=`cat chart/Chart.yaml | yq '.version'`
+    - export ARGO_APP_BRANCH=$DRONE_BRANCH
+    - export ARGO_APP_IMAGE_TAG=$DRONE_COMMIT_SHA
+    - kubectl get -f ./kube/applicationset.yaml -o yaml  > /tmp/old_appset.yaml
+    - yq "del(.spec.generators[].list.elements[] | select(.name == \"$ARGO_APP_BRANCH\"))" /tmp/old_appset.yaml > /tmp/clean_appset1.yaml
+    - yq "del(.spec.generators[].list.elements[] | select(.commit_sha == \"$ARGO_APP_IMAGE_TAG\"))" /tmp/clean_appset1.yaml > /tmp/clean_appset.yaml
+    - envsubst  < ./kube/main.yaml > /tmp/elements.yaml
+    - yq '.spec.generators[].list.elements += load("/tmp/elements.yaml")' /tmp/clean_appset.yaml > /tmp/new_appset.yaml
+    - kubectl apply -f /tmp/new_appset.yaml
+
+```
+
+Then I just need to upgrade `./kube/template.yaml`, so it contains `commit_sha: $ARGO_APP_IMAGE_TAG`.
+
+> Also, I've found out that `ArgoCD` won't remove a namespace if it was created by a `SyncPolicy`, so I've added it to the helm chart, and add a new `value` to provide a name.
 
-> Also, I've found out that `ArgoCD` won't remove a namespace if it was created by a `SyncPolicy`, so I've added it to the helm chart, and add a new `value` to provide a name.