checks if the file exists before trying the command

1 files changed, 4 insertions, 4 deletions

diff --git a/libs/system.php b/libs/system.php
index 702ef3b..ee43722 100644
--- a/libs/system.php
+++ b/libs/system.php
@@ -6,11 +6,11 @@ date_default_timezone_set(@date_default_timezone_get());
 $hostname = php_uname('n');
 
 // OS
-if (!($os = shell_exec('/usr/bin/lsb_release -ds | cut -d= -f2 | tr -d \'"\'')))
+if (!file_exists('/usr/bin/lsb_release') || !($os = shell_exec('/usr/bin/lsb_release -ds | cut -d= -f2 | tr -d \'"\'')))
 {
-    if (!($os = shell_exec('cat /etc/system-release | cut -d= -f2 | tr -d \'"\'')))
+    if (!file_exists('/etc/system-release') || !($os = shell_exec('cat /etc/system-release | cut -d= -f2 | tr -d \'"\'')))
     {
-        if (!($os = shell_exec('cat /etc/os-release | grep PRETTY_NAME | tail -n 1 | cut -d= -f2 | tr -d \'"\'')))
+        if (!file_exists('/etc/os-release') || !($os = shell_exec('cat /etc/os-release | grep PRETTY_NAME | tail -n 1 | cut -d= -f2 | tr -d \'"\'')))
         {
             if (!($os = shell_exec('find /etc/*-release -type f -exec cat {} \; | grep PRETTY_NAME | tail -n 1 | cut -d= -f2 | tr -d \'"\'')))
             {
@@ -72,4 +72,4 @@ $datas = array(
     'server_date'   => $server_date,
 );
 
-echo json_encode($datas);
\ No newline at end of file
+echo json_encode($datas);