Argocd Diff Finder

Argocd Diff Finder is a small bash script that can tell you what your actual changes on your resources will be when you merge your changes to the ArgoCD repository.

Why you need it

It's free, easy and open source.
It's easy to install
No more pain knowing what your changes will be when you merge your changes to the ArgoCD repository.

Features

It's a bash script :D (no need to install anything)
None except telling you the differences between your changes and the state of your app in Kubernetes.

Demo

How it works

Argocd Diff Finder works with two configurations:

All your app declarations and their helm charts, yaml files are in the same repository (ARGOCD_GIT_URL)
- It scans your app declarations and their helm charts and yaml files and finds the differences between your changes and the state of your app in Kubernetes.
You have a repository for your app declarations and point to another repository for your helm charts and yaml files.
- In this case, Argocd diff finder needs to be run on the repository that host your helm charts and yaml files.
- It will clone the argocd repository and then run the diff finder to find the path of all your apps.
  - It will extract information in your app configurations in order to find the name of your argo apps that have been impacted by the changes in your branch
It uses the argocd app diff command to find the differences between your changes and the state of your app in Kubernetes.

Installation

Optional: Install dyff
- brew install homeport/tap/dyff
- export KUBECTL_EXTERNAL_DIFF="dyff between -b "
Go to your branch with the changes you want to merge.
Make sure you pushed your changes
Make a port forward to your argocd server if it is not publicly accessible
Export the following variables

export ARGOCD_SERVER=<localhost:8080> # The ArgoCD server address
export ARGOCD_USERNAME=<username> # The ArgoCD username
export ARGOCD_PASSWORD=<password> # The ArgoCD password
export ARGOCD_GIT_URL=<git-url> # The ArgoCD git url with you applications configuration

Optional: change some values

export MAIN_BRANCH=<main-branch> # The main branch of your application - default main
export ARGOCD_TMP_DIR=<tmp-dir> # The temporary directory to store the diffs - default /tmp/argocd-cd-tmp

Usage

Run the script on your branch with the changes

bash argocd_diff_finder.sh #./argocd_diff_finder.sh

Port Forwarding

-p: Port forwarding to the ArgoCD server
ARGOCD_SERVER: must be set to localhost:8080

Run from anywhere

mkdir ~/bin
cd ~/bin
curl -sL https://raw.githubusercontent.com/StanGirard/argocd-diff-finder/main/argocd_diff_finder.sh > argo-diff
chmod +x argo-diff

## Add to your path
export PATH=~/bin:$PATH

Contributions

Please feel free to add any contribution. I might, if I have the time, translate it into go.

Disclaimers

It comes as is, without any warranty.