Redirect unlink to rmdir (#27101)

Many API callers will call unlink even for directories and it can mess
up with some wrappers like the encryption wrapper

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

lib/private/Files/View.php

@@ -692,7 +692,11 @@ class View {
 		if ($mount and $mount->getInternalPath($absolutePath) === '') {
 			return $this->removeMount($mount, $absolutePath);
 		}
-		$result = $this->basicOperation('unlink', $path, array('delete'));
+		if ($this->is_dir($path)) {
+			$result = $this->basicOperation('rmdir', $path, ['delete']);
+		} else {
+			$result = $this->basicOperation('unlink', $path, ['delete']);
+		}
 		if (!$result && !$this->file_exists($path)) { //clear ghost files from the cache on delete
 			$storage = $mount->getStorage();
 			$internalPath = $mount->getInternalPath($absolutePath);

tests/lib/Files/ViewTest.php

@@ -515,6 +515,30 @@ class ViewTest extends \Test\TestCase {
 		$this->assertFalse($rootView->file_exists('substorage/bar.txt'));
 	}
 
+	public function rmdirOrUnlinkDataProvider() {
+		return [['rmdir'], ['unlink']];
+	}
+
+	/**
+	 * @dataProvider rmdirOrUnlinkDataProvider
+	 */
+	public function testRmdir($method) {
+		$storage1 = $this->getTestStorage();
+		$storage2 = $this->getTestStorage();
+		Filesystem::mount($storage1, [], '/');
+
+		$rootView = new View('');
+		$rootView->mkdir('sub');
+		$rootView->mkdir('sub/deep');
+		$rootView->file_put_contents('/sub/deep/foo.txt', 'asd');
+
+		$this->assertTrue($rootView->file_exists('sub/deep/foo.txt'));
+
+		$this->assertTrue($rootView->$method('sub'));
+
+		$this->assertFalse($rootView->file_exists('sub'));
+	}
+
 	/**
 	 * @medium
 	 */