work with disk devices

src/eyesis4pi/eyesis4pi_interface.php

@@ -21,6 +21,7 @@
 */
 
 include 'include/response.php';
+include 'include/devices.php';
 
 $cmd = "donothing";
 if (isset($_GET['cmd']))
@@ -31,6 +32,7 @@ else if (isset($argv[1]))
 #hardcoded for eyesis4pi
 $symlink = "/www/pages/ssd";
 $mountpoint = "/mnt/sda1";
+$camogmdisk = "/home/root/camogm.disk";
   
 switch($cmd){
   case "symlink":
@@ -38,13 +40,25 @@ switch($cmd){
     die(symlink($mountpoint,$symlink));
     break;
   case "free_space":
-    if ($_GET['mountpoint']=="/mnt/sda2"){
+    // /dev/sda2 is not a mountpoint but a device because it does not have a file system
+    if ($_GET['mountpoint']=="/dev/sda2"){
+      //root@elphel393:~# cat /home/root/camogm.disk
+      //Device          Start LBA       Current LBA     End LBA
+      ///dev/sda2       195334335       545641716       976768065
+
+      if (!is_file($camogmdisk)){
+        
+      }else{
+        
+      }
+      
       respond_xml("test");
+      
       //unpartitioned area
     }else{
-        if (is_dir($mountpoint)) $res = disk_free_space($mountpoint);
-        else                     $res = 0;
-        respond_xml($res);
+      if (is_dir($mountpoint)) $res = disk_free_space($mountpoint);
+      else                     $res = 0;
+      respond_xml($res);
     }
     break;
   default:

src/php_top/Makefile

@@ -22,7 +22,8 @@ PHP_SCRIPTS=i2c.php \
 PHPINCLUDES=i2c_include.php \
             show_source_include.php \
             parallel_requests.php \
-            response.php
+            response.php \
+            devices.php
             
 all:
 	@echo "make all in src"

src/php_top/devices.php

+<?php
+/*
+*!***************************************************************************
+*! FILE NAME  : devices.php
+*! DESCRIPTION: get devices info
+*! Copyright (C) 2016 Elphel, Inc.
+*! --------------------------------------------------------------------------
+*!  This program is free software: you can redistribute it and/or modify
+*!  it under the terms of the GNU General Public License as published by
+*!  the Free Software Foundation, either version 3 of the License, or
+*!  (at your option) any later version.
+*!
+*!  This program is distributed in the hope that it will be useful,
+*!  but WITHOUT ANY WARRANTY; without even the implied warranty of
+*!  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*!  GNU General Public License for more details.
+*!
+*!  You should have received a copy of the GNU General Public License
+*!  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*! --------------------------------------------------------------------------
+*/
+
+/** Get a list of suitable partitions. The list will contain SATA devices only and
+ * will have the following format: "name" => "size_in_blocks".
+ */
+function get_partitions()
+{
+	$names = array();
+	$regexp = '/([0-9]+) +(sd[a-z0-9]+$)/';
+	exec("cat /proc/partitions", $partitions);
+
+	// the first two elements of an array are table header and empty line delimiter, skip them
+	for ($i = 2; $i < count($partitions); $i++) {
+		// select SATA devices only
+		if (preg_match($regexp, $partitions[$i], $name) == 1) {
+			$names[$name[2]] = $name[1];
+			$j++;
+		}
+	}
+	return $names;
+}
+
+/** Get a list of disk devices which have file system and can be mounted. This function
+ *  uses 'blkid' command from busybox.
+ */ 
+function get_mnt_dev()
+{
+	$partitions = get_partitions();
+	$devices = array();
+	$fs_types = array();
+	foreach ($partitions as $partition => $size) {
+		$res = array();
+		$dev = "/dev/" . $partition;
+		exec("blkid " . $dev, $res);
+		if (!empty($res)) {
+			$devices[$i] = preg_replace('/: +.*/', "", $res[0]);
+			if (preg_match('/(?<=TYPE=")[a-z0-9]+(?=")/', $res[0], $fs) == 1)
+				$fs_types[$i] = $fs[0];
+			else
+				$fs_types[$i] = "none";
+			$i++;
+		}
+	}
+	
+	return array("devices" => $devices, "types" => $fs_types);
+}
+
+/** Get a list of devices whithout file system which can be used for raw disk storage from camogm. */
+function get_raw_dev()
+{
+	$j = 0;
+	$ret = get_mnt_dev();
+	$devices = $ret["devices"]; 
+	$types = $ret["types"];
+
+	$names = get_partitions();
+	
+	// filter out partitions with file system 
+	$i = 0;
+	$raw_devices = array();
+
+	foreach ($names as $name => $size) {
+		$found = false;
+		foreach ($devices as $device) {
+			if (strpos($device, $name) !== false)
+				$found = true;
+		}
+		if ($found === false) {
+			// current partition is not found in the blkid list, add it to raw devices
+			$raw_devices["/dev/" . $name] = $size;
+			$i++;
+		}
+	}
+	
+	//special case
+	if (count($raw_devices)>1) {
+            foreach($raw_devices as $k=>$v){
+                if (preg_match('/sd[a-z][0-9]/',$k)==0) {
+                    unset($raw_devices[$k]);
+                }
+            }
+	}
+	return $raw_devices;
+}
+
+?>