feat(web): implement async git pull with real-time status updates

- Replace synchronous git pull execution with background job system
- Add AJAX endpoints for starting and monitoring git pull operations
- Implement process tracking using PID files and exit code files
- Add real-time log display with tail reading functionality
- Improve user experience with non-blocking UI and status updates
- Maintain backward compatibility with existing sudo permissions setup

web/gitpull.php

@@ -18,12 +18,91 @@ if (!isset($_SESSION[$OJ_NAME.'_'.'administrator'])) {
 // ====================================================
 
 $src_path = '/home/judge/src';
-$output = [];
+$current_user = isset($_SESSION[$OJ_NAME.'_'.'user_id']) ? $_SESSION[$OJ_NAME.'_'.'user_id'] : 'admin';
-$return_code = -1;
+$job_key = preg_replace('/[^a-zA-Z0-9_\-]/', '_', $current_user);
+$job_base = sys_get_temp_dir() . '/hustoj_gitpull_' . $job_key;
+$log_file = $job_base . '.log';
+$pid_file = $job_base . '.pid';
+$code_file = $job_base . '.code';
 
-// 打开页面或点击重试按钮时均以 root 身份执行 git pull
+function is_process_running($pid) {
-$cmd = "sudo git -C " . escapeshellarg($src_path) . " pull 2>&1";
+    $pid = intval($pid);
-exec($cmd, $output, $return_code);
+    if ($pid <= 0) {
+        return false;
+    }
+    $out = [];
+    $ret = 1;
+    exec('ps -p ' . $pid . ' >/dev/null 2>&1', $out, $ret);
+    return $ret === 0;
+}
+
+function read_tail($file, $maxBytes = 200000) {
+    if (!file_exists($file)) {
+        return '';
+    }
+    $size = filesize($file);
+    if ($size === false || $size <= $maxBytes) {
+        return file_get_contents($file);
+    }
+    $fp = fopen($file, 'rb');
+    if (!$fp) {
+        return '';
+    }
+    fseek($fp, -$maxBytes, SEEK_END);
+    $data = fread($fp, $maxBytes);
+    fclose($fp);
+    return $data === false ? '' : $data;
+}
+
+if (isset($_GET['ajax'])) {
+    header('Content-Type: application/json; charset=utf-8');
+    $action = isset($_GET['action']) ? $_GET['action'] : '';
+
+    if ($action === 'start') {
+        $running = false;
+        if (file_exists($pid_file)) {
+            $pid_now = trim(file_get_contents($pid_file));
+            $running = is_process_running($pid_now);
+        }
+        if (!$running) {
+            @unlink($code_file);
+            @unlink($log_file);
+            $script = 'sudo git -C ' . escapeshellarg($src_path) . ' pull > ' . escapeshellarg($log_file) . ' 2>&1; echo $? > ' . escapeshellarg($code_file);
+            $cmd = 'nohup sh -c ' . escapeshellarg($script) . ' >/dev/null 2>&1 & echo $!';
+            $out = [];
+            $ret = 1;
+            exec($cmd, $out, $ret);
+            $pid = isset($out[0]) ? trim($out[0]) : '';
+            if ($pid !== '') {
+                file_put_contents($pid_file, $pid);
+            }
+        }
+        echo json_encode(['ok' => true]);
+        exit;
+    }
+
+    if ($action === 'status') {
+        $pid = file_exists($pid_file) ? trim(file_get_contents($pid_file)) : '';
+        $running = is_process_running($pid);
+        $done = file_exists($code_file);
+        $exit_code = null;
+        if ($done) {
+            $exit_code = intval(trim(file_get_contents($code_file)));
+        }
+        $log = read_tail($log_file);
+        echo json_encode([
+            'ok' => true,
+            'running' => $running,
+            'done' => $done,
+            'exit_code' => $exit_code,
+            'log' => $log
+        ]);
+        exit;
+    }
+
+    echo json_encode(['ok' => false, 'msg' => 'unknown action']);
+    exit;
+}
 
 $show_title = "Git Pull - " . $OJ_NAME;
 require("template/".$OJ_TEMPLATE."/header.php");
@@ -35,26 +114,97 @@ require("template/".$OJ_TEMPLATE."/header.php");
         <div class="content">服务器更新 <small style="font-size:0.6em; color:#888;">(git pull <?php echo htmlspecialchars($src_path); ?>)</small></div>
     </h2>
 
-    <div class="ui <?php echo $return_code === 0 ? 'success' : 'error'; ?> message">
+    <div id="statusBox" class="ui info message">
-        <div class="header"><?php echo $return_code === 0 ? '更新成功' : '更新失败（返回码：' . $return_code . '）'; ?></div>
+        <div id="statusHeader" class="header">准备开始更新...</div>
-        <pre style="margin-top:8px; white-space:pre-wrap; word-break:break-all;"><?php echo htmlspecialchars(implode("\n", $output)); ?></pre>
+        <pre id="logBox" style="margin-top:8px; white-space:pre-wrap; word-break:break-all; max-height:420px; overflow:auto;"></pre>
-        <?php if ($return_code !== 0): ?>
-        <div style="margin-top:10px; padding:10px; background:#f8f8f8; border-radius:4px; font-size:0.9em;">
-            <b>若提示 sudo 权限不足，请在服务器上执行以下命令（仅需一次）：</b><br>
-            <code>echo "www-data ALL=(ALL) NOPASSWD: /usr/bin/git" | sudo tee /etc/sudoers.d/www-data-git</code><br>
-            <code>sudo chmod 440 /etc/sudoers.d/www-data-git</code>
-        </div>
-        <?php endif; ?>
     </div>
 
     <div style="margin-top:16px;">
-        <?php if ($return_code !== 0): ?>
+        <button id="retryBtn" class="ui primary button" style="display:none;">
-        <a class="ui primary button" href="gitpull.php">
             <i class="refresh icon"></i> 重试 git pull
-        </a>
+        </button>
-        <?php endif; ?>
         <a class="ui button" href="javascript:history.back()">返回</a>
     </div>
+
+    <div style="margin-top:10px; padding:10px; background:#f8f8f8; border-radius:4px; font-size:0.9em;">
+        <b>若提示 sudo 权限不足，请在服务器上执行以下命令（仅需一次）：</b><br>
+        <code>echo "www-data ALL=(ALL) NOPASSWD: /usr/bin/git" | sudo tee /etc/sudoers.d/www-data-git</code><br>
+        <code>sudo chmod 440 /etc/sudoers.d/www-data-git</code>
+    </div>
 </div>
 
+<script>
+(function () {
+    var statusBox = document.getElementById('statusBox');
+    var statusHeader = document.getElementById('statusHeader');
+    var logBox = document.getElementById('logBox');
+    var retryBtn = document.getElementById('retryBtn');
+    var timer = null;
+
+    function setStatus(type, text) {
+        statusBox.className = 'ui ' + type + ' message';
+        statusHeader.textContent = text;
+    }
+
+    function pollStatus() {
+        $.getJSON('gitpull.php', { ajax: 1, action: 'status', _: Date.now() }, function (res) {
+            if (!res || !res.ok) {
+                setStatus('error', '获取状态失败');
+                retryBtn.style.display = 'inline-block';
+                return;
+            }
+
+            logBox.textContent = res.log || '';
+            logBox.scrollTop = logBox.scrollHeight;
+
+            if (res.done) {
+                if (res.exit_code === 0) {
+                    setStatus('success', '更新成功');
+                    retryBtn.style.display = 'none';
+                } else {
+                    setStatus('error', '更新失败（返回码：' + res.exit_code + '）');
+                    retryBtn.style.display = 'inline-block';
+                }
+                if (timer) {
+                    clearInterval(timer);
+                    timer = null;
+                }
+            } else {
+                setStatus('info', res.running ? '更新中，请稍候...' : '任务启动中...');
+                retryBtn.style.display = 'none';
+            }
+        }).fail(function () {
+            setStatus('error', '请求失败，请重试');
+            retryBtn.style.display = 'inline-block';
+            if (timer) {
+                clearInterval(timer);
+                timer = null;
+            }
+        });
+    }
+
+    function startJob() {
+        setStatus('info', '正在启动更新任务...');
+        logBox.textContent = '';
+        retryBtn.style.display = 'none';
+        $.getJSON('gitpull.php', { ajax: 1, action: 'start', _: Date.now() }, function () {
+            pollStatus();
+            if (timer) {
+                clearInterval(timer);
+            }
+            timer = setInterval(pollStatus, 1000);
+        }).fail(function () {
+            setStatus('error', '任务启动失败');
+            retryBtn.style.display = 'inline-block';
+        });
+    }
+
+    retryBtn.addEventListener('click', function () {
+        startJob();
+    });
+
+    startJob();
+})();
+</script>
+
 <?php require("template/".$OJ_TEMPLATE."/footer.php"); ?>