feat: add a "match_tags" option

I use this action to release the chart of [Mercure](https://mercure.rocks).
We use a monolithic Git repository containing several projects, including the Helm chart.
Currently, this action isn't compatible with our setup because it computes the changes
made to the chart since the previous tag.

In our case we also use tags for other projects in the same repository,
so this actions is never triggered because there are no changes with the "previous" tag (which usually is for another project in the same repository).

This PR introduces a `match_tags` option allowing to filter the tags to match using a glob.

Signed-off-by: Kévin Dunglas <[email protected]>

README.md

@@ -21,6 +21,7 @@ A GitHub action to turn a GitHub project into a self-hosted Helm chart repo, usi
 - `charts_repo_url`: The GitHub Pages URL to the charts repo (default: `https://<owner>.github.io/<project>`)
 - `skip_packaging`: This option, when populated, will skip the packaging step. This allows you to do more advanced packaging of your charts (for example, with the `helm package` command) before this action runs. This action will only handle the indexing and publishing steps.
 - `mark_as_latest`: When you set this to `false`, it will mark the created GitHub release not as 'latest'.
+- `match_tags`: The glob to use to filter Git tags, usually used with the `CR_RELEASE_NAME_TEMPLATE` environment variable (default: all tags)
 
 ### Environment variables
 

action.yml

@@ -32,6 +32,9 @@ inputs:
     description: Mark the created GitHub release as 'latest'
     required: false
     default: true
+  match_tags:
+    description: "The glob to use to filter Git tags (default: all tags)"
+    required: false
 
 runs:
   using: composite
@@ -76,5 +79,9 @@ runs:
             args+=(--mark-as-latest "${{ inputs.mark_as_latest }}")
         fi
 
+        if [[ -n "${{ inputs.match_tags }}" ]]; then
+            args+=(--match-tags "${{ inputs.match_tags }}")
+        fi
+
         "$GITHUB_ACTION_PATH/cr.sh" "${args[@]}"
       shell: bash

cr.sh

@@ -35,6 +35,7 @@ Usage: $(basename "$0") <options>
     -s, --skip-packaging     Skip the packaging step (run your own packaging before using the releaser)
         --skip-existing      Skip package upload if release exists
     -l, --mark-as-latest     Mark the created GitHub release as 'latest' (default: true)
+    -m, --match-tags         The glob to use to filter Git tags (default: all tags)
 EOF
 }
 
@@ -49,6 +50,7 @@ main() {
     local skip_packaging=
     local skip_existing=
     local mark_as_latest=true
+    local match_tags=
 
     parse_command_line "$@"
 
@@ -185,6 +187,14 @@ parse_command_line() {
                 if [[ -n "${2:-}" ]]; then
                     mark_as_latest="$2"
                     shift
+            -m|--match-tags)
+                if [[ -n "${2:-}" ]]; then
+                    match_tags="$2"
+                    shift
+                else
+                    echo "ERROR: '--match-tags' cannot be empty." >&2
+                    show_help
+                    exit 1
                 fi
                 ;;
             *)
@@ -242,7 +252,13 @@ install_chart_releaser() {
 lookup_latest_tag() {
     git fetch --tags > /dev/null 2>&1
 
-    if ! git describe --tags --abbrev=0 HEAD~ 2> /dev/null; then
+    args=("describe" "--tags" "--abbrev=0")
+    if [ -n "$match_tags" ]; then
+        args+=(--match="$match_tags")
+    fi
+    args+=(HEAD~)
+
+    if ! git "${args[@]}" 2> /dev/null; then
         git rev-list --max-parents=0 --first-parent HEAD
     fi
 }