add output for "availble" php version

.github/workflows/main.yml

@@ -22,5 +22,6 @@ jobs:
     - name: Get the result
       run: |
         echo -e "Versions :\n${{ steps.run.outputs.versions }}"
+        echo -e "Available PHP :\n${{ steps.run.outputs.php-available }}"
         echo -e "Branches :\n${{ steps.run.outputs.branches }}"
         echo -e "Matrix :\n${{ steps.run.outputs.matrix }}"

README.md

@@ -50,6 +50,10 @@ Maximum supported php version
 
 Minimum supported php version
 
+### `php-available`
+
+Maximum supported php version that is available in the runner
+
 ### `php-max-list`
 
 Maximum supported php version, as a single-item list
@@ -58,6 +62,10 @@ Maximum supported php version, as a single-item list
 
 Minimum supported php version, as a single-item list
 
+### `php-available-list`
+
+Maximum supported php version that is available in the runner, as a single-item list
+
 ### `branches-max`
 
 Maximum supported server version

package.json

@@ -5,7 +5,7 @@
   "main": "src/action.js",
   "scripts": {
     "build": "ncc build src/action.js -o dist",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "INPUT_FILENAME=.github/workflows/info.xml node src/action.js"
   },
   "keywords": [],
   "author": "",

src/action.js

@@ -5,6 +5,8 @@ const fs = require('fs');
 const urlExist = require('url-exist');
 const {HttpClient} = require('@actions/http-client');
 const equal = require('deep-equal');
+const { promisify } = require('util');
+const exec = promisify(require('child_process').exec)
 
 const client = new HttpClient('nextcloud-version-matrix')
 
@@ -47,6 +49,15 @@ async function getAllPhpVersions() {
     return matches.map(match => match[1]);
 }
 
+async function distroSupportsPhpVersion(version) {
+    try {
+        const output = await exec(`apt-cache policy php${version}`);
+        return output.stdout.includes("Candidate")
+    } catch (_e) {
+        return false;
+    }
+}
+
 function onlyUnique(value, index, array) {
     return array.findIndex(item => equal(value, item)) === index;
 }
@@ -142,6 +153,15 @@ function copy(obj) {
             }
         }
 
+        const distroPhp = [];
+        let availablePhp = phpMax;
+        for(let version of php) {
+            if (await distroSupportsPhpVersion(version)) {
+                distroPhp.push(version)
+                availablePhp = version;
+            }
+        }
+
         // matrix with a single server version per php version
         const phpMatrix = cartesianProduct({
             "php-versions": php,
@@ -175,11 +195,13 @@ function copy(obj) {
 
         core.setOutput("php-min-list", JSON.stringify([php[0]]));
         core.setOutput("php-max-list", JSON.stringify([php[php.length - 1]]));
+        core.setOutput("php-available-list", JSON.stringify([availablePhp]));
         core.setOutput("branches-min-list", JSON.stringify([branches[0]]));
         core.setOutput("branches-max-list", JSON.stringify([branches[branches.length - 1]]));
 
         core.setOutput("php-min", php[0]);
         core.setOutput("php-max", php[php.length - 1]);
+        core.setOutput("php-available", availablePhp);
         core.setOutput("branches-min", branches[0]);
         core.setOutput("branches-max", branches[branches.length - 1]);