feat(helmfile-actions): Helmfile sync action (#286)

* feat(helmfile-actions): Helmfile sync action

* adding more information on to the readme

helmfile-actions/README.md

@@ -28,6 +28,7 @@ Example usage of `helmfile diff`:
     command: diff
     working_directory: helmfile/
 ```
+Helmfile apply first does a diff between the last deployment and the locally rendered helmfile and deploys only the delta between the two. Helmfile apply only increments the release version if a delta is found. This may not detect manual changes made to helm releases if there is no delta between the last deployment and the current helmfile.
 
 Example usage of `helmfile apply`:
 
@@ -37,3 +38,13 @@ Example usage of `helmfile apply`:
     command: apply
     working_directory: helmfile/
 ```
+Helmfile sync always updates all releases and applies everything in the rendered helmfile. Sync takes longer to run but will detect and revert any manual changes made outside of the helmfile. Helmfile sync will always increment release version even if there is no change, keep this in mind if a helm rollback is required.
+
+Example usage of `helmfile sync`:
+
+```yaml
+- uses: iStreamPlanet/github-actions/helmfile-actions@main
+  with:
+    command: sync
+    working_directory: helmfile/
+```

helmfile-actions/main.sh

@@ -11,6 +11,7 @@ function main {
   scriptDir=$(dirname ${0})
   source ${scriptDir}/diff.sh
   source ${scriptDir}/apply.sh
+  source ${scriptDir}/sync.sh
 
   case "${command}" in
     diff)
@@ -19,6 +20,9 @@ function main {
     apply)
       helmfileApply
       ;;
+    sync)
+      helmfileSync
+      ;;
     *)
       echo "Error: Unrecognized command ${command}"
       exit 1

helmfile-actions/sync.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+function helmfileSync {
+  set -o pipefail
+  tempfile=$(mktemp)
+  helmfile sync 2>&1 | tee $tempfile
+  exitCode=$?
+  output=$(cat $tempfile)
+  rm $tempfile
+
+  if [ ${exitCode} -eq 0 ]; then
+    echo "Successfully ran helmfile sync command."
+  else
+    echo "Error: Failed to run helmfile sync"
+  fi
+
+  echo
+  exit ${exitCode}
+}