scripts/system_controls.php

<?php
session_start();
$user = shell_exec("awk -F: '/1000/{print $1}' /etc/passwd");
$user = trim($user);
$home = shell_exec("awk -F: '/1000/{print $6}' /etc/passwd");
$home = trim($home);
$fetch = shell_exec("sudo -u".$user." git -C ".$home."/BirdNET-Pi fetch 2>&1");
$str = trim(shell_exec("sudo -u".$user." git -C ".$home."/BirdNET-Pi status"));
if (preg_match("/behind '.*?' by (\d+) commit(s?)\b/", $str, $matches)) {
  $num_commits_behind = $matches[1];
  $_SESSION['behind'] = $num_commits_behind; 
}
if (preg_match('/\b(\d+)\b and \b(\d+)\b different commits each/', $str, $matches)) {
    $num1 = (int) $matches[1];
    $num2 = (int) $matches[2];
    $sum = $num1 + $num2;
    $_SESSION['behind'] = $sum; 
}
?><html>
<meta name="viewport" content="width=device-width, initial-scale=1">
<br>
<br>
<script>
var seconds = 0;
function update() {
  if(confirm('Are you sure you want to update?')) {
    setInterval(function(){ seconds += 1; document.getElementById('updatebtn').innerHTML = "Updating: <pre id='timer' class='bash'>"+new Date(seconds * 1000).toISOString().substring(14, 19)+"</span>"; }, 1000);
    return true;
  } else {
    return false;
  }
}
</script>
<div class="systemcontrols">
  <form action="" method="GET">
    <button type="submit" name="submit" value="sudo reboot" onclick="return confirm('Are you sure you want to reboot?')">Reboot</button>
  </form>
  <form action="" method="GET">
    <button type="submit" name="submit" id="updatebtn" value="update_birdnet.sh" onclick="update();">Update <?php if(isset($_SESSION['behind']) && $_SESSION['behind'] != "0" && $_SESSION['behind'] != "with"){?><div class="updatenumber"><?php echo $_SESSION['behind']; ?></div><?php } ?></button>
  </form>
  <form action="" method="GET">
    <button type="submit" name="submit" value="sudo shutdown now" onclick="return confirm('Are you sure you want to shutdown?')">Shutdown</button>
  </form>
  <form action="" method="GET">
    <button type="submit" name="submit" value="sudo clear_all_data.sh" onclick="return confirm('Clear ALL Data? Note that this cannot be undone and will take up to 90 seconds.')">Clear ALL data</button>
  </form> 
<?php
  $cmd="cd ".$home."/BirdNET-Pi && sudo -u ".$user." git rev-list --max-count=1 HEAD";
  $curr_hash = shell_exec($cmd);
?>
  <p style="font-size:11px;text-align:center"></br></br>Running version: </p>
  <a href="https://github.com/mcguirepr89/BirdNET-Pi/commit/<?php echo $curr_hash; ?>" target="_blank">
    <p style="font-size:11px;text-align:center;box-sizing: border-box"><?php echo $curr_hash; ?></p>
  </a>
</div>