bug #18820 [Config] Allow schemed paths in FileResource (nicolas-grekas)

This PR was merged into the 3.1 branch.

Discussion
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[Config] Allow schemed paths in FileResource

| Q             | A
| ------------- | ---
| Branch?       | 3.1
| Bug fix?      | yes
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #17598
| License       | MIT
| Doc PR        | -

This is a small new feature fixing a BC break that has been introduced in #17598 on 3.1.
It happens that 3.1 is breaking a `phar` app on our side where we end up doing something like `new FileResource('phar://...')`.

Ping @xabbuh and @javiereguiluz esp.

Commits
-------

c73f34d [Config] Allow schemed path in FileResource

src/Symfony/Component/Config/Resource/FileResource.php

@@ -36,6 +36,10 @@ public function __construct($resource)
     {
         $this->resource = realpath($resource);
 
+        if (false === $this->resource && file_exists($resource)) {
+            $this->resource = $resource;
+        }
+
         if (false === $this->resource) {
             throw new \InvalidArgumentException(sprintf('The file "%s" does not exist.', $resource));
         }

src/Symfony/Component/Config/Tests/Resource/FileResourceTest.php

@@ -21,7 +21,7 @@ class FileResourceTest extends \PHPUnit_Framework_TestCase
 
     protected function setUp()
     {
-        $this->file = realpath(sys_get_temp_dir()).'/tmp.xml';
+        $this->file = sys_get_temp_dir().'/tmp.xml';
         $this->time = time();
         touch($this->file, $this->time);
         $this->resource = new FileResource($this->file);
@@ -41,6 +41,12 @@ public function testGetResource()
         $this->assertSame(realpath($this->file), $this->resource->getResource(), '->getResource() returns the path to the resource');
     }
 
+    public function testGetResourceWithScheme()
+    {
+        $resource = new FileResource('file://'.$this->file);
+        $this->assertSame('file://'.$this->file, $resource->getResource(), '->getResource() returns the path to the schemed resource');
+    }
+
     public function testToString()
     {
         $this->assertSame(realpath($this->file), (string) $this->resource);