Problem matchers

.dockerignore

@@ -1,6 +1,7 @@
 # ignore all files by default
 *
 # include required files with an exception
+!cfn-lint.json
 !entrypoint.sh
 !LICENSE
 !README.md

Dockerfile

@@ -15,6 +15,7 @@ LABEL "maintainer"="Scott Brenner <scott@scottbrenner.me>"
 RUN apk --no-cache add python3
 RUN pip3 install cfn-lint
 
+COPY cfn-lint.json /cfn-lint.json
 COPY entrypoint.sh /entrypoint.sh
 RUN ["chmod", "+x", "/entrypoint.sh"]
 ENTRYPOINT ["/entrypoint.sh"]

README.md

@@ -2,6 +2,8 @@
 
 This Action for [CloudFormation Linter](https://github.com/aws-cloudformation/cfn-python-lint/) enables arbitrary actions for interacting with CloudFormation Linter to validate CloudFormation yaml/json templates against the CloudFormation spec and additional checks. Includes checking valid values for resource properties and best practices.
 
+![screenshot](screenshot.png)
+
 ## Usage
 
 An example workflow for testing CloudFormation templates for correct properties and their values - run the `cfn-lint` command with the path to the files you want to test as `args`.

cfn-lint.json

@@ -0,0 +1,20 @@
+{
+    "problemMatcher": [
+        {
+            "owner": "cfn-lint",
+            "pattern": [
+                {
+                    "regexp": "^([EWI](\\d{4}))\\s(.+)$",
+                    "code": 1,
+                    "message": 3
+                },
+                {
+                    "regexp": "^(\\S+):(\\d+):(\\d+)$",
+                    "file": 1,
+                    "line": 2,
+                    "column": 3
+                }
+            ]
+        }
+    ]
+}

entrypoint.sh

@@ -2,4 +2,8 @@
 
 set -e
 
+# Copy the matcher to the host system; otherwise "add-matcher" can't find it.
+cp /cfn-lint.json /github/workflow/cfn-lint.json
+echo "::add-matcher::${RUNNER_TEMP}/_github_workflow/cfn-lint.json"
+
 sh -c "cfn-lint $*"