From bdec85853208415584245c747f63e764f19bb709 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?K=C3=A9vin=20Dunglas?= <dunglas@gmail.com>
Date: Mon, 12 Jul 2021 16:24:19 +0200
Subject: [PATCH] feat: add a "match_tags" option
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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 <dunglas@gmail.com>
---
 README.md  |  1 +
 action.yml |  7 +++++++
 cr.sh      | 18 +++++++++++++++++-
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index e689410..2d2cb0e 100644
--- a/README.md
+++ b/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
 
diff --git a/action.yml b/action.yml
index 3521e64..7696c8e 100644
--- a/action.yml
+++ b/action.yml
@@ -29,6 +29,9 @@ 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
@@ -69,5 +72,9 @@ 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
diff --git a/cr.sh b/cr.sh
index f87a4b3..8d58755 100755
--- a/cr.sh
+++ b/cr.sh
@@ -34,6 +34,7 @@ Usage: $(basename "$0") <options>
     -i, --install-only       Just install the cr tool
     -s, --skip-packaging     Skip the packaging step (run your own packaging before using the releaser)
     -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
 }
 
@@ -47,6 +48,7 @@ main() {
     local install_only=
     local skip_packaging=
     local mark_as_latest=true
+    local match_tags=
 
     parse_command_line "$@"
 
@@ -177,6 +179,14 @@ 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
                 ;;
             *)
@@ -234,7 +244,13 @@ 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
 }