[stable9] Fix decrypt message stable9 (#25188)

* Fix Decrypt message via occ

* Comments fixed

* Fixed reviews

* Originally:
commit 2304e4bda027e61ff1302c55c2f70f8e4c8f47d0
Author: Joas Schilling <nickvergessen@owncloud.com>
Date:   Tue Jun 7 09:13:11 2016 +0200

    Allow to decrypt user '0' files only

* Fix uid comparison

1 files changed, 12 insertions, 3 deletions

diff --git a/core/command/encryption/decryptall.php b/core/command/encryption/decryptall.php
index 0a126db5b17..83c6c1dc168 100644
--- a/core/command/encryption/decryptall.php
+++ b/core/command/encryption/decryptall.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * @author Björn Schießle <schiessle@owncloud.com>
+ * @author Björn Schießle <bjoern@schiessle.org>
  * @author Joas Schilling <nickvergessen@owncloud.com>
  *
  * @copyright Copyright (c) 2016, ownCloud, Inc.
@@ -111,7 +111,8 @@ class DecryptAll extends Command {
 		$this->addArgument(
 			'user',
 			InputArgument::OPTIONAL,
-			'user for which you want to decrypt all files (optional)'
+			'user for which you want to decrypt all files (optional)',
+			''
 		);
 	}
 
@@ -127,8 +128,15 @@ class DecryptAll extends Command {
 				return;
 			}
 
+			$uid = $input->getArgument('user');
+			if ($uid === '') {
+				$message = 'your ownCloud';
+			} else {
+				$message = "$uid's account";
+			}
+
 			$output->writeln("\n");
-			$output->writeln('You are about to start to decrypt all files stored in your ownCloud.');
+			$output->writeln("You are about to start to decrypt all files stored in $message.");
 			$output->writeln('It will depend on the encryption module and your setup if this is possible.');
 			$output->writeln('Depending on the number and size of your files this can take some time');
 			$output->writeln('Please make sure that no user access his files during this process!');
@@ -140,6 +148,7 @@ class DecryptAll extends Command {
 				$result = $this->decryptAll->decryptAll($input, $output, $user);
 				if ($result === false) {
 					$output->writeln(' aborted.');
+					$output->writeln('Server side encryption remains enabled');
 					$this->config->setAppValue('core', 'encryption_enabled', 'yes');
 				}
 				$this->resetSingleUserAndTrashbin();