Add disk usage info

scripts/index.php

@@ -52,26 +52,59 @@
                     <button class="button button-outline" name="shutdown">Shut down</button>
 		</form>
             </p>
+
+	    <?php
+	    if (isset($_POST['cardbackup']))
+	    {
+		shell_exec('sudo ./card-backup.sh 2>&1 & echo $!');
+	    }
+	    if (isset($_POST['camerabackup']))
+	    {
+		shell_exec('sudo ./camera-backup.sh 2>&1 & echo $!');
+	    }
+	    if (isset($_POST['minidlna']))
+	    {
+		shell_exec('sudo ./minidlna.sh 2>&1 & echo $!');
+
+		// folder to check
+		$dir = '/media/storage';
+
+		// get disk space free (in bytes)
+		$disk_free = disk_free_space($dir);
+
+		// get disk space total (in bytes)
+		$disk_total = disk_total_space($dir);
+
+		// calculate the disk space used (in bytes)
+		$disk_used = $disk_total - $disk_free;
+
+		// percentage of disk used
+		$disk_used_p = sprintf('%.2f',($disk_used / $disk_total) * 100);
+
+		// this function will convert bytes value to KB, MB, GB and TB
+		function convertSize( $bytes )
+		{
+		    $sizes = array( 'B', 'KB', 'MB', 'GB', 'TB' );
+		    for( $i = 0; $bytes >= 1024 && $i < ( count( $sizes ) -1 ); $bytes /= 1024, $i++ );
+		    return( round( $bytes, 2 ) . " " . $sizes[$i] );
+		}
+
+		// format the disk sizes using the function (B, KB, MB, GB and TB)
+		$disk_free = convertSize($disk_free);
+		$disk_used = convertSize($disk_used);
+		$disk_total = convertSize($disk_total);
+
+		echo '<ul>';
+		echo '<li>Total: '.$disk_total.'</li>';
+		echo '<li>Used: '.$disk_used.' ('.$disk_used_p.'%)</li>';
+		echo '<li>Free: '.$disk_free.'</li>';
+		echo '</ul>';
+	    }
+	    if (isset($_POST['shutdown']))
+	    {
+		shell_exec('sudo shutdown -h now 2>&1 & echo $!');
+	    }
+	    ?>
 	</div>
     </body>
-
 </html>
-
-<?php
-if (isset($_POST['cardbackup']))
-{
-    shell_exec('sudo ./card-backup.sh 2>&1 & echo $!');
-}
-if (isset($_POST['camerabackup']))
-{
-    shell_exec('sudo ./camera-backup.sh 2>&1 & echo $!');
-}
-if (isset($_POST['minidlna']))
-{
-    shell_exec('sudo ./minidlna.sh 2>&1 & echo $!');
-}
-if (isset($_POST['shutdown']))
-{
-    shell_exec('sudo shutdown -h now 2>&1 & echo $!');
-}
-?>