Add frontend/backend scripts for disk formatter

/** 

 * @file format_disk.js

 * @brief Disk formatting front end for Elphel393 series camera

 * @copyright Copyright (C) 2017 Elphel Inc.

 * @author Mikhail Karpenko <mikhail@elphel.com>

 *

 * @licstart  The following is the entire license notice for the 

 * JavaScript code in this page.

 *

 *   The JavaScript code in this page is free software: you can

 *   redistribute it and/or modify it under the terms of the GNU

 *   General Public License (GNU GPL) as published by the Free Software

 *   Foundation, either version 3 of the License, or (at your option)

 *   any later version.  The code is distributed WITHOUT ANY WARRANTY;

 *   without even the implied warranty of MERCHANTABILITY or FITNESS

 *   FOR A PARTICULAR PURPOSE.  See the GNU GPL for more details.

 *

 *   As additional permission under GNU GPL version 3 section 7, you

 *   may distribute non-source (e.g., minimized or compacted) forms of

 *   that code without the copy of the GNU GPL normally required by

 *   section 4, provided you include this license notice and a URL

 *   through which recipients can access the Corresponding Source.

 *

 *  @licend  The above is the entire license notice

 *  for the JavaScript code in this page.

 */

function init_actions() {

	$("#btn_format").click(function() {

		var btn_class_disabled = "btn btn-danger disabled";

		if ($("#btn_format").attr("class") != btn_class_disabled) {

			// introduce this var to fasicilitate further upgrades

			var index = 0;

			var disk_path = $("#path_cell_" + index).text()

			force = '';

			if ($("#chk_force").is(':checked'))

				force = '&force';

			else

				force = '';

			$("#status_cell_" + index).text("Formatting");

			$.ajax({

				url:"format_disk.php?cmd=format&disk_path=" + disk_path + force,

				success: function(result) {

					if (result == "OK") {

						$("#status_cell_" + index).text("Done");

						$("#btn_format").attr("class", btn_class_disabled);

						$("#chk_force").attr("disabled", true);

					} else {

						if (result == "")

							result = "Unrecognized error";

						console.log(result);

						$("#status_cell_" + index).text(result);

						$("#disk_row_" + index).attr("class", "danger");

					}

				}

			})

		}

	});

}

<?php

/**

 * @file format_disk.php

 * @brief Disk formatting back end for Elphel393 series camera

 * @copyright Copyright (C) 2017 Elphel Inc.

 * @author Mikhail Karpenko <mikhail@elphel.com>

 *

 * @par <b>License</b>:

 *  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/>.

 */

$parted_script = "format_disk.py";

function get_disks_list()

{

	global $parted_script;

	exec($parted_script . " --list", $output, $ret_val);

	return array("ret_val" => $ret_val, "disks" => $output);

}

function table_row($index, $disk_path, $disk_size, $sys_size, $status = "")

{

	echo "<tr id='disk_row_" . $index . "'>" .

			"<td id='path_cell_" . $index . "'>" . $disk_path . "</td>" .

			"<td>" . $disk_size . "</td>" .

			"<td>" . $sys_size . "</td>" .

			"<td id='status_cell_". $index . "'>" . $status . "</td>" .

			"</tr>";

}

function table_row_err($msg)

{

	echo "<tr>" . "<td colspan='4'>" . $msg . "</td>" . "</tr>";

}

function table_body($disks)

{

	$ret_val = $disks["ret_val"];

	$num = count($disks["disks"]);

	if ($ret_val == 0 && $num > 0) {

		for ($i = 0; $i < $num; $i++) {

			$data = explode(":", $disks["disks"][$i]);

			table_row($i, $data[0], $data[1], $data[2]);

		}

	} else if ($ret_val == 0 && $num == 0) {

		$msg = "No disks suitable for partitioning";

		table_row_err($msg);

	} else {

		table_row_err($disks["disks"][0]);

	}

}

function btn_class($inactive)

{

	$class = "btn btn-danger";

	if ($inactive)

		echo $class . " disabled";

	else

		echo $class;

}

/* process commands */

if (isset($_GET["cmd"]))

	$cmd = $_GET["cmd"];

else

	$cmd = "no_command";

if ($cmd == "format") {

	if (isset($_GET["disk_path"])) {

		if (isset($_GET["force"]))

			$force = ' -f ';

		else

			$force = ' ';

		$disk_path = $_GET["disk_path"];

		exec($parted_script . $force . $disk_path, $output, $ret_val);

		if ($ret_val == 0) {

			print("OK");

		} else {

			foreach ($output as $key => $val)

				if ($val == '')

					unset($output[$key]);

			print(implode(', ', $output));

		}

		exit();

	}

} else {

	// just create the page

	$disks_list = get_disks_list();

	if ($disks_list["ret_val"] != 0 || count($disks_list["disks"]) == 0)

		$no_disk = true;

	else

		$no_disk = false;

}

?>

<!doctype html>

<html lang="en">

<head>

	<meta charset="utf-8"/>

	<meta name="author" content="Elphel"/>

	<link rel="stylesheet" href="js/bootstrap/css/bootstrap.css">

	<script src="js/jquery-2.2.3.js"></script>

	<script src="js/jquery-ui/jquery-ui.js"></script>

	<script src="js/bootstrap/js/bootstrap.js"></script>

	<script src="format_disk.js"></script>	

</head>

<body onload="init_actions()" style="padding-top:0px;">

	<h2 id="title" style="padding-left:10px;">Format disk</h2>

	<div style="padding-left:10px;">

		<table class="table">

			<thead>

				<tr><th>Disk</th><th>Total size</th><th>System partition</th><th>Status</th></tr>

			</thead>

			<tbody id="disks_list">

				<?php table_body($disks_list);	?>

			</tbody>

		</table>

	</div>

	<div style="padding-left:10px;">

		<span class="checkbox"><label><input id="chk_force" type="checkbox">Forse 'mkfs' to create a file system</label></span>

		<button id="btn_format" type="button" class="<?php btn_class($no_disk); ?>"><b>Format</b></button>

	</div>

</body>

</html>

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