Merge pull request #9 from rarchk/pre-commit-hooks

updating generalized helm differ

README.md

@@ -167,3 +167,48 @@ jobs:
           ARTIFACTORY_USERNAME: ${{ secrets.ARTIFACTORY_HELM_USERNAME }}
           ARTIFACTORY_PASSWORD: ${{ secrets.ARTIFACTORY_HELM_PASSWORD }}
 ```
+
+## Diff as a template
+Diff can be used to compute differences between complex helm distributions
+
+```mermaid
+graph TD
+subgraph ComplexHelmDistributions
+HelmFile --> ListOfHelmCharts
+CustomRelease --> ListOfHelmCharts
+end
+
+subgraph CD_Workflows
+ArgoCDApplication --> HelmChart
+end
+subgraph HELM_Repos
+B[HelmChart]
+end
+
+CD_Workflows --> D
+ComplexHelmDistributions -.-> D
+ComplexHelmDistributions -.-> D
+ComplexHelmDistributions -.-> D
+HELM_Repos --> D
+D[[Diff Action Template]]
+D --> C(fa:fa-genderless)
+```
+### Algorithm
+1. We would need previous and next version
+2. We would need access to remote chart repository
+3. We can use this command to generate templates locally and remotely
+4. We take following inputs
+   1. previous version
+   2. current version[optional] or can be generated locally
+
+```bash
+# local templating
+helm template <chart_name>.tgz -f values.yaml
+
+# remote templating
+helm template <remote_repo>/chart_name --version 1.17.1 -f values.yaml
+
+# search for all versions
+helm search repo <remote_repo>/chart_name --versions
+```
+4. Diff it

main.sh

@@ -60,8 +60,8 @@ case "${ACTION}" in
         OUTPUT=$(sh -c "dyff between /tmp/upstream_values.yaml /tmp/current_values.yaml -c on" 2>&1)
         OUTPUT1=$(sh -c "dyff between /tmp/upstream_values.yaml /tmp/current_values.yaml" 2>&1)
         if [ $? -ge 2 ]; then
-            OUTPUT=$(sh -c "diff --color /tmp/upstream_values.yaml /tmp/current_values.yaml" 2>&1)
-            OUTPUT1=$(sh -c "diff /tmp/upstream_values.yaml /tmp/current_values.yaml" 2>&1)
+            OUTPUT=$(sh -c "diff -u --color /tmp/upstream_values.yaml /tmp/current_values.yaml" 2>&1)
+            OUTPUT1=$(sh -c "diff -u /tmp/upstream_values.yaml /tmp/current_values.yaml" 2>&1)
         fi
         SUCCESS=$?
         echo -e '\033[1mComputed Helm Diff\033[0m'
@@ -71,7 +71,12 @@ case "${ACTION}" in
         COMMENT="#### \`Computed Helm Diff\` Output
 <details>
 <summary>Details</summary>
+
+
+```bash
 $OUTPUT1
+```
+
 </details>"
         PAYLOAD=$(echo '{}' | jq --arg body "$COMMENT" '.body = $body')