GH Actions: use the xmllint-validate action runner + add some extra checks

.github/CONTRIBUTING.md

@@ -61,7 +61,7 @@ This package contains Composer scripts to quickly run the developer checks which
 
 After `composer install`, you can do:
 
-- `composer lint`: Lint PHP and XML files in against parse errors.
+- `composer lint`: Lint PHP files against parse errors.
 - `composer cs`: Check the code style and code quality of the codebase via PHPCS.
 - `composer test`: Run the unit tests for the VIPCS sniffs.
 - `composer test-coverage`: Run the unit tests for the VIPCS sniffs with coverage enabled.

.github/workflows/basics.yml

@@ -22,6 +22,9 @@ jobs:
     name: 'Basic CS and QA checks'
     runs-on: ubuntu-latest
 
+    env:
+      XMLLINT_INDENT: '	' # This is a tab character.
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -33,21 +36,6 @@ jobs:
           coverage: none
           tools: cs2pr
 
-      # Updating the lists can fail intermittently, typically after Microsoft has released a new package.
-      # This should not be blocking for this job, so ignore any errors from this step.
-      # Ref: https://github.com/dotnet/core/issues/4167
-      - name: Update the available packages list
-        continue-on-error: true
-        run: sudo apt-get update
-
-      - name: Install xmllint
-        run: sudo apt-get install --no-install-recommends -y libxml2-utils
-
-      # Show XML violations inline in the file diff.
-      # @link https://github.com/marketplace/actions/xmllint-problem-matcher
-      - name: Enable showing XML issues inline
-        uses: korelstar/xmllint-problem-matcher@v1
-
       # Validate the composer.json file.
       # @link https://getcomposer.org/doc/03-cli.md#validate
       - name: Validate Composer installation
@@ -65,8 +53,43 @@ jobs:
           # Bust the cache at least once a month - output format: YYYY-MM.
           custom-cache-suffix: $(date -u "+%Y-%m")
 
-      - name: 'Validate XML against schema and check code style'
-        run: ./bin/xml-lint
+      # Validate the XML file.
+      - name: Validate rulesets against schema
+        uses: phpcsstandards/xmllint-validate@v1
+        with:
+          pattern: "./*/ruleset.xml"
+          xsd-file: "vendor/squizlabs/php_codesniffer/phpcs.xsd"
+
+      # Check the code-style consistency of the XML file.
+      # Note: this needs xmllint, but that will be installed via the phpcsstandards/xmllint-validate action runner in the previous step.
+      - name: Check XML code style
+        run: |
+          diff -B --tabsize=4 ./WordPressVIPMinimum/ruleset.xml <(xmllint --format "./WordPressVIPMinimum/ruleset.xml")
+          diff -B --tabsize=4 ./WordPress-VIP-Go/ruleset.xml <(xmllint --format "./WordPress-VIP-Go/ruleset.xml")
+
+      # Validate dev tool related XML files.
+      - name: Validate Project PHPCS ruleset against schema
+        uses: phpcsstandards/xmllint-validate@v1
+        with:
+          pattern: ".phpcs.xml.dist"
+          xsd-file: "vendor/squizlabs/php_codesniffer/phpcs.xsd"
+
+      # Notes:
+      # - PHPUnit 9.5 (which will be installed in this job) doesn't ship XSD files further back than 8.5.
+      # - PHPUnit 9.3 introduced some new configuration options and deprecated the old versions of those.
+      #   For cross-version compatibility with older PHPUnit versions, those new config options cannot be used yet,
+      #   which is why the PHPUnit 9 validation is done against the PHPUnit 9.2 schema.
+      - name: "Validate PHPUnit config for use with PHPUnit 8"
+        uses: phpcsstandards/xmllint-validate@v1
+        with:
+          pattern: "phpunit.xml.dist"
+          xsd-file: "vendor/phpunit/phpunit/schema/8.5.xsd"
+
+      - name: "Validate PHPUnit config for use with PHPUnit 9"
+        uses: phpcsstandards/xmllint-validate@v1
+        with:
+          pattern: "phpunit.xml.dist"
+          xsd-file: "vendor/phpunit/phpunit/schema/9.2.xsd"
 
       # Check the code-style consistency of the PHP files.
       - name: Check PHP code style

composer.json

@@ -39,8 +39,7 @@
 	"scripts": {
 		"test-ruleset": "bin/ruleset-tests",
 		"lint": [
-			"bin/php-lint",
-			"bin/xml-lint"
+			"bin/php-lint"
 		],
 		"cs": "@php ./vendor/squizlabs/php_codesniffer/bin/phpcs",
 		"test": "bin/unit-tests",
@@ -57,7 +56,7 @@
 		]
 	},
 	"scripts-descriptions": {
-		"lint": "VIPCS: Lint PHP and XML files in against parse errors.",
+		"lint": "VIPCS: Lint PHP files against parse errors.",
 		"cs": "VIPCS: Check the code style and code quality of the codebase via PHPCS.",
 		"test": "VIPCS: Run the unit tests for the VIPCS sniffs.",
 		"test-coverage": "VIPCS: Run the unit tests for the VIPCS sniffs with coverage enabled.",