Simplify chart change detection

action.yml

@@ -36,5 +36,8 @@ runs:
             args+=(--charts-repo-url "${{ inputs.charts_repo_url }}")
         fi
 
+        # Install yq
+        sudo snap install yq
+
         "$GITHUB_ACTION_PATH/cr.sh" "${args[@]}"
       shell: bash

cr.sh

@@ -50,13 +50,9 @@ main() {
     repo_root=$(git rev-parse --show-toplevel)
     pushd "$repo_root" > /dev/null
 
-    echo 'Looking up latest tag...'
-    local latest_tag
-    latest_tag=$(lookup_latest_tag)
-
-    echo "Discovering changed charts since '$latest_tag'..."
+    echo "Discovering changed charts..."
     local changed_charts=()
-    readarray -t changed_charts <<< "$(lookup_changed_charts "$latest_tag")"
+    readarray -t changed_charts <<< "$(lookup_changed_charts)"
 
     if [[ -n "${changed_charts[*]}" ]]; then
         install_chart_releaser
@@ -199,38 +195,18 @@ install_chart_releaser() {
     fi
 }
 
-lookup_latest_tag() {
-    git fetch --tags > /dev/null 2>&1
-
-    if ! git describe --tags --abbrev=0 2> /dev/null; then
-        git rev-list --max-parents=0 --first-parent HEAD
-    fi
-}
-
-filter_charts() {
-    while read -r chart; do
-        [[ ! -d "$chart" ]] && continue
-        local file="$chart/Chart.yaml"
-        if [[ -f "$file" ]]; then
-            echo "$chart"
-        else
-           echo "WARNING: $file is missing, assuming that '$chart' is not a Helm chart. Skipping." 1>&2
+lookup_changed_charts() {
+    charts_dir=charts
+    charts=$(find "$charts_dir" -name Chart.yaml -type f -exec dirname {} +)
+    for chart_path in $charts; do
+        chart_version=$(helm show chart $chart_path | yq eval '.version' -)
+        chart_tag="$(basename $chart_path)-$chart_version"
+        if [ ! $(git tag -l $chart_tag) ]; then
+            echo $chart_path
         fi
     done
 }
 
-lookup_changed_charts() {
-    local commit="$1"
-
-    local changed_files
-    changed_files=$(git diff --find-renames --name-only "$commit" -- "$charts_dir")
-
-    local depth=$(( $(tr "/" "\n" <<< "$charts_dir" | wc -l) + 1 ))
-    local fields="1-${depth}"
-
-    cut -d '/' -f "$fields" <<< "$changed_files" | uniq | filter_charts
-}
-
 package_chart() {
     local chart="$1"