fix: read ql runtime logs from syslog

test/back/qlServiceLogCommand.test.cjs

@@ -16,9 +16,10 @@ function writeExecutable(filePath, content) {
   fs.writeFileSync(filePath, content, { mode: 0o755 });
 }
 
-test('ql log scopes PM2 output to qinglong and forwards log options', () => {
-  const shellDir = path.join(fixtureRoot, 'shell');
-  const binDir = path.join(fixtureRoot, 'bin');
+function prepareFixture(name) {
+  const testRoot = path.join(fixtureRoot, name);
+  const shellDir = path.join(testRoot, 'shell');
+  const binDir = path.join(testRoot, 'bin');
   fs.mkdirSync(shellDir, { recursive: true });
   fs.mkdirSync(binDir, { recursive: true });
 
@@ -28,29 +29,100 @@ test('ql log scopes PM2 output to qinglong and forwards log options', () => {
   );
   fs.writeFileSync(
     path.join(shellDir, 'share.sh'),
-    'load_ql_envs() { :; }\nimport_config() { :; }\n',
+    [
+      'dir_data="${QL_DATA_DIR:-$QL_DIR/data}"',
+      'load_ql_envs() { :; }',
+      'import_config() { :; }',
+      '',
+    ].join('\n'),
   );
   fs.writeFileSync(path.join(shellDir, 'api.sh'), '');
   fs.writeFileSync(path.join(shellDir, 'env.sh'), '');
   writeExecutable(
     path.join(binDir, 'pm2'),
-    '#!/usr/bin/env bash\nprintf "%s\\n" "$@"\n',
+    '#!/usr/bin/env bash\necho "pm2 must not be called" >&2\nexit 99\n',
+  );
+
+  return { binDir, shellDir, testRoot };
+}
+
+test('ql log reads the requested system log history without PM2', () => {
+  const { binDir, shellDir, testRoot } = prepareFixture('host');
+  const systemLogDir = path.join(testRoot, 'data/syslog');
+  fs.mkdirSync(systemLogDir, { recursive: true });
+  fs.writeFileSync(
+    path.join(systemLogDir, '2026-08-20.log'),
+    'system-one\nsystem-two\nsystem-three\n',
   );
 
   const result = spawnSync(
     '/bin/bash',
-    [path.join(shellDir, 'update.sh'), 'log', '--lines', '25', '--nostream'],
+    [path.join(shellDir, 'update.sh'), 'log', '--lines', '2', '--nostream'],
     {
       encoding: 'utf8',
       env: {
         ...process.env,
         PATH: `${binDir}:${process.env.PATH}`,
-        QL_DIR: fixtureRoot,
+        QL_CONTAINER: 'false',
+        QL_DIR: testRoot,
       },
     },
   );
 
   assert.equal(result.status, 0, result.stderr);
-  assert.equal(result.stdout, 'logs\nqinglong\n--lines\n25\n--nostream\n');
-  assert.equal(fs.existsSync(path.join(fixtureRoot, 'data/log/log')), false);
+  assert.equal(result.stdout, 'system-two\nsystem-three\n');
+  assert.equal(fs.existsSync(path.join(testRoot, 'data/log/log')), false);
+});
+
+test('ql log follows the current Winston system log without PM2', () => {
+  const { binDir, shellDir, testRoot } = prepareFixture('container');
+  const systemLogDir = path.join(testRoot, 'data/syslog');
+  const currentDate = spawnSync('date', ['+%F'], { encoding: 'utf8' }).stdout.trim();
+  const currentLog = path.join(systemLogDir, `${currentDate}.log`);
+  fs.mkdirSync(systemLogDir, { recursive: true });
+  fs.writeFileSync(currentLog, 'system-one\n');
+  writeExecutable(
+    path.join(binDir, 'tail'),
+    '#!/usr/bin/env bash\nprintf "tail"\nprintf " <%s>" "$@"\nprintf "\\n"\n',
+  );
+
+  const result = spawnSync(
+    '/bin/bash',
+    [path.join(shellDir, 'update.sh'), 'log', '--lines', '0'],
+    {
+      encoding: 'utf8',
+      env: {
+        ...process.env,
+        PATH: `${binDir}:${process.env.PATH}`,
+        QL_CONTAINER: 'true',
+        QL_DIR: testRoot,
+      },
+    },
+  );
+
+  assert.equal(result.status, 0, result.stderr);
+  assert.equal(result.stdout, `tail <-n> <0> <--retry> <-F> <${currentLog}>\n`);
+  assert.equal(fs.existsSync(path.join(testRoot, 'data/log/log')), false);
+});
+
+test('ql log reports when no persisted system log exists', () => {
+  const { binDir, shellDir, testRoot } = prepareFixture('container-nostream');
+
+  const result = spawnSync(
+    '/bin/bash',
+    [path.join(shellDir, 'update.sh'), 'log', '--nostream'],
+    {
+      encoding: 'utf8',
+      env: {
+        ...process.env,
+        PATH: `${binDir}:${process.env.PATH}`,
+        QL_CONTAINER: 'true',
+        QL_DIR: testRoot,
+      },
+    },
+  );
+
+  assert.equal(result.status, 0);
+  assert.equal(result.stdout, '');
+  assert.match(result.stderr, /no system log found/);
 });