feat(chv): 阶段 2 客机运行时三分 daemon/execd/syncd + restore 留 seed.iso + tap 退避

- 客机三分（chv-guest/chv-daemon.py、chv-execd.py、chv-syncd.py，
  仅标准库；systemd Restart=always；build.sh 拷入 + 单元 + enable；
  buildinfo/check/generate lockfile 登记）：
  daemon=心跳/资源上报/快照配合（prepare-snapshot 问 execd，
  有运行中任务或联系不上即拒绝）；execd=shell/文件读写/codex
  托管（chv-cell 起 host.py，setsid 脱离，任务登记落盘，
  重启按 pid 认领；SO_PEERCRED 只认 uid 0/1000；codex env
  白名单）；syncd=常驻循环只调 chv-sync pull/push，规则一条
  不改（先 pull --ff-only 再 push，分叉即停、不 --force、
  不 rebase；仓不存在记 needs-boot 不擅自 clone）。
  host.py 仍是唯一任务/codex 引擎，broker/browser/cell 分工
  不变，不另起第二套 agent。
- 阶段 1 遗留修复：restore_vm 失败路径 stop_vm(keep_disk=True)，
  seed.iso 与任务盘都留，重试有输入；vm.boot/restore 的 tap
  触点遇 Resource busy 等 tap 空闲后重试一次（_wait_tap_idle
  看 ip link state，_ch_remote 报错带 stderr 尾巴以便识别）；
  诊断不用 pgrep -x（15 字符上限）。
- 单测 cloud/tests/test_chv_opt_stage2.py 25 项；P2 干跑夹具
  与 enable 行断言随构建接线更新。
- 全量 cloud/tests 2001 全过（skipped=8）。

chv-guest/build.sh

@@ -186,6 +186,14 @@ for p2_script in chv-cell.py chv-broker.py chv-browser.py; do
     exit 1
   fi
 done
+# feat-chv-opt-landing（阶段 2）：客机运行时三分——daemon /
+# execd / syncd 三脚本缺一即失败（与 chv-sync.sh 同款门）。
+for stage2_script in chv-daemon.py chv-execd.py chv-syncd.py; do
+  if [ ! -f "$SCRIPT_DIR/$stage2_script" ]; then
+    echo "缺少 $stage2_script（阶段 2 客机服务）：$SCRIPT_DIR" >&2
+    exit 1
+  fi
+done
 if [ "$DRY_RUN" = "0" ]; then
   if [ ! -e /dev/kvm ]; then
     echo "CHV_GUEST_BUILD needs a KVM host: /dev/kvm 不存在" >&2
@@ -294,6 +302,10 @@ VC_ARGS=(-a "$OUT/disk.raw"
   --copy-in "$SCRIPT_DIR/chv-broker.py:/usr/local/bin/"
   --copy-in "$SCRIPT_DIR/chv-browser.py:/usr/local/bin/"
   --run-command 'mv /usr/local/bin/chv-cell.py /usr/local/bin/chv-cell && mv /usr/local/bin/chv-broker.py /usr/local/bin/chv-broker && mv /usr/local/bin/chv-browser.py /usr/local/bin/chv-browser && chmod +x /usr/local/bin/chv-cell /usr/local/bin/chv-broker /usr/local/bin/chv-browser'
+  --copy-in "$SCRIPT_DIR/chv-daemon.py:/usr/local/bin/"
+  --copy-in "$SCRIPT_DIR/chv-execd.py:/usr/local/bin/"
+  --copy-in "$SCRIPT_DIR/chv-syncd.py:/usr/local/bin/"
+  --run-command 'mv /usr/local/bin/chv-daemon.py /usr/local/bin/chv-daemon && mv /usr/local/bin/chv-execd.py /usr/local/bin/chv-execd && mv /usr/local/bin/chv-syncd.py /usr/local/bin/chv-syncd && chmod +x /usr/local/bin/chv-daemon /usr/local/bin/chv-execd /usr/local/bin/chv-syncd'
   --run-command 'printf "runcmd:\n - systemctl restart ssh || service ssh restart || true\n - test -f /etc/chv/guest-env && chown chv:chv /etc/chv/guest-env || true\n - /usr/local/bin/chv-data-mount >>/var/log/chv-data-mount.log 2>&1 || true\n - /usr/local/bin/chv-sync boot >>/var/log/chv-sync.log 2>&1 || true\n" > /etc/cloud/cloud.cfg.d/99-chv-sync.cfg'
   --run-command 'git config --system user.name chv && git config --system user.email chv@localhost && git config --system credential.helper store && git config --system init.defaultBranch main'
   --run-command "$GT_INSTALL_CMD"
@@ -304,7 +316,10 @@ VC_ARGS=(-a "$OUT/disk.raw"
   --run-command 'useradd --system --home-dir /var/lib/chv-browser --shell /usr/sbin/nologin chv-browser && mkdir -p /var/lib/chv-browser /run/chv/shots && chown chv-browser:chv-browser /var/lib/chv-browser /run/chv/shots && chmod 0755 /run/chv /run/chv/shots'
   --run-command 'printf "[Unit]\nDescription=CHV cell broker (Muse P2)\nAfter=network.target\n\n[Service]\nType=simple\nExecStart=/usr/bin/python3 /usr/local/bin/chv-broker\nRestart=on-failure\nRestartSec=2\n\n[Install]\nWantedBy=multi-user.target\n" > /etc/systemd/system/chv-broker.service'
   --run-command 'printf "[Unit]\nDescription=CHV browser sub-agent (Muse P2)\nAfter=network.target\n\n[Service]\nType=simple\nUser=chv-browser\nGroup=chv-browser\nExecStart=/usr/bin/python3 /usr/local/bin/chv-browser\nRestart=on-failure\nRestartSec=2\n\n[Install]\nWantedBy=multi-user.target\n" > /etc/systemd/system/chv-browser.service'
-  --run-command 'printf "d /run/chv 0755 root root -\nd /run/chv/shots 0755 chv-browser chv-browser -\n" > /etc/tmpfiles.d/chv.conf && systemctl enable chv-broker chv-browser || true')
+  --run-command 'printf "[Unit]\nDescription=CHV guest runtime daemon (stage 2: heartbeat/resources/snapshot)\nAfter=network.target\n\n[Service]\nType=simple\nExecStart=/usr/bin/python3 /usr/local/bin/chv-daemon\nRestart=always\nRestartSec=2\n\n[Install]\nWantedBy=multi-user.target\n" > /etc/systemd/system/chv-daemon.service'
+  --run-command 'printf "[Unit]\nDescription=CHV guest exec daemon (stage 2: shell/files/codex hosting)\nAfter=network.target\n\n[Service]\nType=simple\nExecStart=/usr/bin/python3 /usr/local/bin/chv-execd\nRestart=always\nRestartSec=2\n\n[Install]\nWantedBy=multi-user.target\n" > /etc/systemd/system/chv-execd.service'
+  --run-command 'printf "[Unit]\nDescription=CHV Gitea sync daemon (stage 2: resident pull/push loop)\nAfter=network.target\n\n[Service]\nType=simple\nUser=chv\nGroup=chv\nExecStart=/usr/bin/python3 /usr/local/bin/chv-syncd\nRestart=always\nRestartSec=2\n\n[Install]\nWantedBy=multi-user.target\n" > /etc/systemd/system/chv-syncd.service'
+  --run-command 'printf "d /run/chv 0755 root root -\nd /run/chv/shots 0755 chv-browser chv-browser -\nd /run/chv/tasks 0755 root root -\n" > /etc/tmpfiles.d/chv.conf && systemctl enable chv-broker chv-browser chv-daemon chv-execd chv-syncd || true')
 # P1 交接（Muse P1 的 vsock_notify.py）：文件在仓库里存在时拷入
 # 镜像（P1 分支才有，本分支尚无）；不存在时只警告、不失败——
 # 合并后自动生效，P2 不改该脚本内容。

chv-guest/buildinfo.py

@@ -41,6 +41,8 @@ BASE_CONTENTS = [
     "systemd-container", "chv-cell", "chv-broker", "chv-browser",
     # feat-chv-opt-landing（阶段 1）：数据盘挂载脚本。
     "chv-data-mount",
+    # feat-chv-opt-landing（阶段 2）：客机运行时三分服务。
+    "chv-daemon", "chv-execd", "chv-syncd",
 ]
 
 # 执行器默认内核 cmdline（config.py），构建产物须与它一起记录（B-12），

chv-guest/check_lockfile.py

@@ -33,6 +33,11 @@ DECLARED_SOURCES = {
     # feat-chv-opt-landing（阶段 1）：数据盘挂载脚本，版本随
     # repo_commit（与 chv-sync 同款）。
     "chv-data-mount": "repo_commit",
+    # feat-chv-opt-landing（阶段 2）：客机运行时三分服务，版本
+    # 随 repo_commit（与 chv-sync 同款）。
+    "chv-daemon": "repo_commit",
+    "chv-execd": "repo_commit",
+    "chv-syncd": "repo_commit",
 }
 
 

chv-guest/chv-daemon.py

@@ -0,0 +1,315 @@
+#!/usr/bin/env python3
+"""chv-daemon：客机运行时 daemon（阶段 2 三分之一）。
+
+职责（只做这三件，不碰任务执行与同步）：
+  1. 生命周期/心跳：每 10 秒写 /run/chv/heartbeat.json（atomic），
+     含 pid、启动时间、seq、uptime、loadavg、内存、workspace
+     余量、execd 任务数、sync 最近状态摘要。seq 跨重启连续
+     （启动时读旧文件续号），宿主侧据此判断“心跳丢了还是
+     daemon 重启了”。
+  2. 资源上报：同上，心跳文件即上报载体（宿主经 SSH 读文件，
+     不另开通道；控制通道仍是 SSH，见 executor.py 定稿）。
+  3. 快照配合：Unix socket /run/chv/daemon.sock，op
+     prepare-snapshot——问 execd 是否有运行中任务；有则
+     拒绝（{ok:false, reason:task-running}），无则写
+     /run/chv/snapshot-ready.json 标记并返回 ok；execd
+     联系不上时同样拒绝（fail-closed，不写标记）。
+     宿主侧快照流程暂未调它（阶段 2 不改 executor 快照流），
+     接口先行、供宿主侧后续接线与本阶段 live 演练。
+
+与既有分工的映射（不要第二套 agent）：
+  - host.py 仍是唯一的任务/ codex 执行引擎（CLI，经 SSH 或
+    execd 的 codex op 调）；daemon 从不跑 host.py。
+  - chv-broker/chv-browser 仍是单元内外 IPC 与浏览器子代理，
+    daemon 不碰它们的 socket。
+  - sync 仍是 chv-sync.sh + chv-syncd 常驻循环，daemon 只读
+    sync-status.json 作摘要，不调 git。
+
+只用标准库。以 root 运行（读 /proc 与各服务状态文件无权限
+问题；socket 0600 root:root，只接受本机 root 客户）。
+"""
+import json
+import os
+import signal
+import socket
+import sys
+import threading
+import time
+
+HEARTBEAT_PATH = "/run/chv/heartbeat.json"
+DAEMON_SOCK = "/run/chv/daemon.sock"
+SNAPSHOT_READY_PATH = "/run/chv/snapshot-ready.json"
+EXECD_SOCK = "/run/chv/execd.sock"
+EXECD_TASKS = "/run/chv/execd-tasks.json"
+SYNC_STATUS = "/run/chv/sync-status.json"
+WORKSPACE = "/home/chv/workspace"
+HEARTBEAT_INTERVAL = 10.0
+MAX_REQUEST_BYTES = 65536
+
+
+def _atomic_write(path, data: bytes):
+    tmp = "%s.tmp.%d" % (path, os.getpid())
+    with open(tmp, "wb") as fh:
+        fh.write(data)
+        fh.flush()
+        os.fsync(fh.fileno())
+    os.rename(tmp, path)
+
+
+def _read_json(path):
+    try:
+        with open(path) as fh:
+            return json.load(fh)
+    except (OSError, ValueError):
+        return None
+
+
+def _loadavg():
+    try:
+        with open("/proc/loadavg") as fh:
+            parts = fh.read().split()
+        return [float(parts[0]), float(parts[1]), float(parts[2])]
+    except (OSError, ValueError, IndexError):
+        return None
+
+
+def _meminfo():
+    mem = {}
+    try:
+        with open("/proc/meminfo") as fh:
+            for line in fh:
+                if ":" not in line:
+                    continue
+                key, val = line.split(":", 1)
+                val = val.strip().split()
+                if val and val[0].isdigit():
+                    mem[key.strip()] = int(val[0])
+    except OSError:
+        return None
+    if not mem:
+        return None
+    return {"total_kb": mem.get("MemTotal"),
+            "available_kb": mem.get("MemAvailable")}
+
+
+def _workspace_free():
+    try:
+        st = os.statvfs(WORKSPACE)
+        return st.f_bavail * st.f_frsize
+    except OSError:
+        return None
+
+
+def _execd_task_count():
+    data = _read_json(EXECD_TASKS)
+    if not isinstance(data, dict):
+        return None
+    tasks = data.get("tasks")
+    if not isinstance(tasks, list):
+        return None
+    running = [t for t in tasks
+               if isinstance(t, dict) and t.get("state") == "running"]
+    return {"total": len(tasks), "running": len(running)}
+
+
+def _sync_summary():
+    data = _read_json(SYNC_STATUS)
+    if not isinstance(data, dict):
+        return None
+    return {"last": data.get("last"), "at": data.get("at"),
+            "head": data.get("head"),
+            "error": data.get("error")}
+
+
+def build_heartbeat(pid, started_at, seq):
+    """组装一次心跳 dict（纯函数，便于单测与 --once）。"""
+    now = time.time()
+    return {"service": "chv-daemon", "pid": pid,
+            "started_at": started_at, "seq": seq,
+            "at": now, "uptime_s": round(now - started_at, 1),
+            "loadavg": _loadavg(), "mem": _meminfo(),
+            "workspace_free_bytes": _workspace_free(),
+            "execd_tasks": _execd_task_count(),
+            "sync": _sync_summary()}
+
+
+def _ask_execd_status(timeout=2.0):
+    """问 execd 要任务状态；联系不上返回 (None, reason)。"""
+    sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+    try:
+        sock.settimeout(timeout)
+        sock.connect(EXECD_SOCK)
+        sock.sendall(json.dumps({"op": "status"}).encode() + b"\n")
+        buf = b""
+        while len(buf) < MAX_REQUEST_BYTES:
+            chunk = sock.recv(4096)
+            if not chunk:
+                break
+            buf += chunk
+            if buf.endswith(b"\n"):
+                break
+        data = json.loads(buf.decode())
+        if not data.get("ok"):
+            return None, "execd-status-not-ok"
+        return data, None
+    except (OSError, ValueError) as exc:
+        return None, "execd-unreachable: %s" % exc
+    finally:
+        sock.close()
+
+
+def prepare_snapshot():
+    """快照配合：execd 有运行中任务或联系不上即拒绝。"""
+    data, reason = _ask_execd_status()
+    if data is None:
+        return {"ok": False, "reason": reason}
+    tasks = data.get("tasks") or []
+    running = [t for t in tasks
+               if isinstance(t, dict) and t.get("state") == "running"]
+    if running:
+        return {"ok": False, "reason": "task-running",
+                "running": [t.get("id") for t in running]}
+    marker = {"at": time.time(), "pid": os.getpid(),
+              "note": "no running execd task"}
+    _atomic_write(SNAPSHOT_READY_PATH,
+                  (json.dumps(marker) + "\n").encode())
+    return {"ok": True, "marker": SNAPSHOT_READY_PATH}
+
+
+def handle_request(req):
+    """socket 请求分发（纯函数，便于单测）。"""
+    if not isinstance(req, dict):
+        return {"ok": False, "error": "request must be an object"}
+    op = req.get("op")
+    if op == "ping":
+        return {"ok": True, "service": "chv-daemon",
+                "pid": os.getpid()}
+    if op == "status":
+        hb = _read_json(HEARTBEAT_PATH)
+        return {"ok": True, "heartbeat": hb}
+    if op == "prepare-snapshot":
+        try:
+            return prepare_snapshot()
+        except OSError as exc:
+            return {"ok": False, "reason": "marker-write-failed: %s"
+                    % exc}
+    return {"ok": False, "error": "unknown op: %s" % (op,)}
+
+
+class Daemon:
+    def __init__(self, interval=HEARTBEAT_INTERVAL):
+        self.interval = interval
+        self.pid = os.getpid()
+        self.started_at = time.time()
+        self.seq = 0
+        old = _read_json(HEARTBEAT_PATH)
+        if isinstance(old, dict) and isinstance(old.get("seq"), int):
+            # 续号：宿主据 seq 连续判断心跳丢包还是 daemon 重启。
+            self.seq = old["seq"]
+        self._stop = threading.Event()
+        self._server = None
+
+    def write_heartbeat(self):
+        self.seq += 1
+        hb = build_heartbeat(self.pid, self.started_at, self.seq)
+        _atomic_write(HEARTBEAT_PATH,
+                      (json.dumps(hb) + "\n").encode())
+        return hb
+
+    def _serve(self):
+        if os.path.exists(DAEMON_SOCK):
+            os.remove(DAEMON_SOCK)
+        srv = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+        srv.bind(DAEMON_SOCK)
+        os.chmod(DAEMON_SOCK, 0o600)
+        srv.listen(8)
+        srv.settimeout(0.5)
+        self._server = srv
+        while not self._stop.is_set():
+            try:
+                conn, _ = srv.accept()
+            except socket.timeout:
+                continue
+            except OSError:
+                break
+            with conn:
+                try:
+                    conn.settimeout(5.0)
+                    buf = b""
+                    while len(buf) < MAX_REQUEST_BYTES:
+                        chunk = conn.recv(4096)
+                        if not chunk:
+                            break
+                        buf += chunk
+                        if buf.endswith(b"\n"):
+                            break
+                    req = json.loads(buf.decode())
+                    resp = handle_request(req)
+                except (OSError, ValueError) as exc:
+                    resp = {"ok": False, "error": str(exc)}
+                try:
+                    conn.sendall((json.dumps(resp) + "\n").encode())
+                except OSError:
+                    pass
+        try:
+            srv.close()
+        except OSError:
+            pass
+        try:
+            os.remove(DAEMON_SOCK)
+        except OSError:
+            pass
+
+    def run(self):
+        thread = threading.Thread(target=self._serve, daemon=True)
+        thread.start()
+        try:
+            while not self._stop.is_set():
+                self.write_heartbeat()
+                self._stop.wait(self.interval)
+        finally:
+            self._stop.set()
+            thread.join(timeout=5)
+
+    def stop(self):
+        self._stop.set()
+
+
+def main(argv=None):
+    argv = list(sys.argv[1:] if argv is None else argv)
+    interval = HEARTBEAT_INTERVAL
+    once = False
+    i = 0
+    while i < len(argv):
+        if argv[i] == "--interval" and i + 1 < len(argv):
+            interval = float(argv[i + 1])
+            i += 2
+        elif argv[i] == "--once":
+            once = True
+            i += 1
+        else:
+            print("用法：chv-daemon [--interval 秒] [--once]",
+                  file=sys.stderr)
+            return 2
+    daemon = Daemon(interval=interval)
+    if once:
+        daemon.write_heartbeat()
+        print(json.dumps({"ok": True,
+                          "heartbeat": HEARTBEAT_PATH,
+                          "seq": daemon.seq}))
+        return 0
+    print("chv-daemon pid=%d heartbeat=%s" % (daemon.pid,
+                                               HEARTBEAT_PATH),
+          flush=True)
+
+    def _on_signal(signum, _frame):
+        daemon.stop()
+
+    signal.signal(signal.SIGTERM, _on_signal)
+    signal.signal(signal.SIGINT, _on_signal)
+    daemon.run()
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

chv-guest/chv-execd.py

@@ -0,0 +1,485 @@
+#!/usr/bin/env python3
+"""chv-execd：客机运行时 execd（阶段 2 三分之一）。
+
+职责（只做这三件）：
+  1. shell 命令：op exec（同步跑完返回）/ spawn（脱离式后台跑，
+     立即返回 id）。一律 list argv、绝不用 shell=True；工作区
+     内命令以 chv 身份跑（runuser -u chv），codex 除外。
+  2. 文件读写：op read/write，路径只允许 /home/chv/workspace
+     之内（realpath + commonpath 校验），越界即拒绝。
+  3. codex 进程托管：op codex——经 chv-cell run 起
+     `python3 /app/host.py <args>`（单元隔离口径不变，不绕
+     cell 直跑 host.py）；子进程 setsid 脱离，execd 崩溃不
+     带走它；任务登记落盘 /run/chv/execd-tasks.json，execd
+     重启后按 pid 重新认领（reattach），任务状态不丢。
+
+客户端鉴权：SO_PEERCRED 的 uid 须是 0 或 1000（root / chv），
+其余一律拒绝。socket /run/chv/execd.sock 0600 root:root。
+调用方是宿主执行器经 SSH（root）或客机内 root 服务；单元内
+codex 不直接调 execd（走 chv-broker 白名单）。
+
+任务状态机：running → completed（rc 已收）/ failed（spawn
+失败）/ killed / unknown（execd 重启后 pid 已死且退出码
+不可考——init 已收走，如实记 unknown，不编 rc）。
+spawn 输出进 /run/chv/tasks/<id>.log（runuser 以 chv 写，
+codex 以 root 写，均 0644）。
+
+只用标准库。以 root 运行（要起 chv-cell + runuser）；单租户
+灰度口径——与今天“执行器经 SSH 以 root 跑 host.py”同权，
+多租户收紧待安全再审翻绿后另议。
+"""
+import json
+import os
+import signal
+import socket
+import struct
+import subprocess
+import sys
+import threading
+import time
+import uuid
+
+EXECD_SOCK = "/run/chv/execd.sock"
+TASKS_PATH = "/run/chv/execd-tasks.json"
+TASKS_LOG_DIR = "/run/chv/tasks"
+WORKSPACE = "/home/chv/workspace"
+HOST_PY = "/app/host.py"
+CELL_BIN = "/usr/local/bin/chv-cell"
+ALLOWED_UIDS = (0, 1000)
+MAX_REQUEST_BYTES = 65536
+MAX_OUTPUT_BYTES = 65536
+MAX_FILE_BYTES = 1 << 20
+DEFAULT_TIMEOUT = 120.0
+
+# codex 子进程可透传的环境变量白名单（前缀匹配；调用方
+# 传什么别的都丢弃。模型网关 key 走这个口径，不走 argv，
+# 绝不进任务登记文件与日志）。
+CODEX_ENV_PREFIXES = ("OPENAI_", "CODEX_", "CHV_MODEL_",
+                      "PLAYWRIGHT_")
+
+
+def _atomic_write(path, data: bytes):
+    tmp = "%s.tmp.%d" % (path, os.getpid())
+    with open(tmp, "wb") as fh:
+        fh.write(data)
+        fh.flush()
+        os.fsync(fh.fileno())
+    os.rename(tmp, path)
+
+
+def _read_json(path):
+    try:
+        with open(path) as fh:
+            return json.load(fh)
+    except (OSError, ValueError):
+        return None
+
+
+def _peer_uid(conn):
+    """SO_PEERCRED 取对端 uid；取不到即拒绝（不降级）。"""
+    try:
+        creds = conn.getsockopt(socket.SOL_SOCKET, socket.SO_PEERCRED,
+                                struct.calcsize("3i"))
+        _pid, uid, _gid = struct.unpack("3i", creds)
+        return uid
+    except (OSError, struct.error):
+        return None
+
+
+def _within_workspace(path):
+    """路径是否在 WORKSPACE 内（realpath 后 commonpath 校验）。"""
+    try:
+        real = os.path.realpath(path)
+    except OSError:
+        return False
+    return os.path.commonpath([real, WORKSPACE]) == WORKSPACE
+
+
+def _truncate(text, limit=MAX_OUTPUT_BYTES):
+    if len(text) > limit:
+        return text[:limit] + "\n...<truncated %d bytes>" % (
+            len(text) - limit)
+    return text
+
+
+def _codex_env(extra):
+    """调用方 env 过白名单；只留前缀命中的项。"""
+    env = {"PATH": os.environ.get("PATH", "/usr/local/bin:/usr/bin:/bin"),
+           "HOME": "/home/chv",
+           "PLAYWRIGHT_BROWSERS_PATH":
+               "/usr/local/share/ms-playwright"}
+    if isinstance(extra, dict):
+        for key, val in extra.items():
+            if isinstance(key, str) and isinstance(val, str) \
+                    and key.startswith(CODEX_ENV_PREFIXES):
+                env[key] = val
+    return env
+
+
+class TaskStore:
+    """任务登记（落盘 JSON，execd 重启后重读认领）。"""
+
+    def __init__(self, path=TASKS_PATH):
+        self.path = path
+        self._lock = threading.Lock()
+        self.tasks = {}
+        data = _read_json(path)
+        if isinstance(data, dict) and isinstance(
+                data.get("tasks"), list):
+            for item in data["tasks"]:
+                if isinstance(item, dict) and item.get("id"):
+                    self.tasks[item["id"]] = item
+        self._reattach()
+
+    def _reattach(self):
+        """重启后认领：running 任务按 pid 查存活；已死记
+        unknown（退出码不可考，不编），活着的保持 running。"""
+        for task in self.tasks.values():
+            if task.get("state") != "running":
+                continue
+            pid = task.get("pid")
+            alive = False
+            if isinstance(pid, int):
+                try:
+                    os.kill(pid, 0)
+                    alive = True
+                except (OSError, ProcessLookupError):
+                    alive = False
+                except PermissionError:
+                    alive = True
+            if alive:
+                task["note"] = "reattached after execd restart"
+            else:
+                task["state"] = "unknown"
+                task["note"] = ("execd restarted, exit code "
+                                "unrecoverable (reaped by init)")
+        self._save_locked()
+
+    def _save_locked(self):
+        data = {"tasks": [self.tasks[k] for k in sorted(self.tasks)]}
+        _atomic_write(self.path,
+                      (json.dumps(data) + "\n").encode())
+
+    def add(self, task):
+        with self._lock:
+            self.tasks[task["id"]] = task
+            self._save_locked()
+        return task
+
+    def update(self, task_id, **fields):
+        with self._lock:
+            task = self.tasks.get(task_id)
+            if task is None:
+                return None
+            task.update(fields)
+            self._save_locked()
+            return task
+
+    def get(self, task_id):
+        with self._lock:
+            task = self.tasks.get(task_id)
+            return dict(task) if task else None
+
+    def list(self):
+        with self._lock:
+            return [dict(self.tasks[k]) for k in sorted(self.tasks)]
+
+
+class Execd:
+    def __init__(self, tasks_path=TASKS_PATH):
+        self.store = TaskStore(tasks_path)
+        self._stop = threading.Event()
+        self._procs = {}
+        self._procs_lock = threading.Lock()
+        self._reaper = threading.Thread(target=self._reap_loop,
+                                        daemon=True)
+
+    def _register_proc(self, task_id, proc):
+        with self._procs_lock:
+            self._procs[task_id] = proc
+
+    def _reap_loop(self):
+        """收割已退出的子进程，登记 rc；未知 pid 的直接丢弃。
+        重启后认领的 running 任务不在 _procs 里：轮询 pid
+        存活，死了记 unknown（退出码不可考，不编）。"""
+        while not self._stop.is_set():
+            with self._procs_lock:
+                items = list(self._procs.items())
+            tracked = set()
+            for task_id, proc in items:
+                tracked.add(task_id)
+                rc = proc.poll()
+                if rc is None:
+                    continue
+                with self._procs_lock:
+                    self._procs.pop(task_id, None)
+                task = self.store.get(task_id)
+                if task and task.get("state") == "running":
+                    self.store.update(task_id, state="completed",
+                                      rc=rc, ended_at=time.time())
+            for task in self.store.list():
+                if task.get("state") != "running" \
+                        or task.get("id") in tracked:
+                    continue
+                pid = task.get("pid")
+                alive = False
+                if isinstance(pid, int):
+                    try:
+                        os.kill(pid, 0)
+                        alive = True
+                    except OSError:
+                        alive = False
+                if not alive:
+                    self.store.update(
+                        task["id"], state="unknown",
+                        note=("execd restarted, exit code "
+                              "unrecoverable (reaped by init)"),
+                        ended_at=time.time())
+            self._stop.wait(1.0)
+
+    # -- op 实现 ---------------------------------------------------------
+    def op_exec(self, req):
+        argv = req.get("argv")
+        if not isinstance(argv, list) or not argv \
+                or not all(isinstance(a, str) for a in argv):
+            return {"ok": False, "error": "argv must be a non-empty list of strings"}
+        cwd = req.get("cwd") or WORKSPACE
+        if not _within_workspace(cwd) and cwd != "/home/chv":
+            return {"ok": False, "error": "cwd outside workspace: %s" % cwd}
+        try:
+            timeout = float(req.get("timeout") or DEFAULT_TIMEOUT)
+        except (TypeError, ValueError):
+            return {"ok": False, "error": "bad timeout"}
+        timeout = min(max(timeout, 1.0), 600.0)
+        cmd = ["runuser", "-u", "chv", "--"] + argv
+        try:
+            proc = subprocess.run(cmd, cwd=cwd, timeout=timeout,
+                                  capture_output=True, text=True,
+                                  errors="replace")
+        except subprocess.TimeoutExpired as exc:
+            return {"ok": False, "error": "timeout after %.0fs" % timeout,
+                    "stdout": _truncate(exc.stdout or ""),
+                    "stderr": _truncate(exc.stderr or "")}
+        except OSError as exc:
+            return {"ok": False, "error": "spawn failed: %s" % exc}
+        return {"ok": True, "rc": proc.returncode,
+                "stdout": _truncate(proc.stdout or ""),
+                "stderr": _truncate(proc.stderr or "")}
+
+    def op_spawn(self, req, kind="exec"):
+        argv = req.get("argv")
+        if not isinstance(argv, list) or not argv \
+                or not all(isinstance(a, str) for a in argv):
+            return {"ok": False, "error": "argv must be a non-empty list of strings"}
+        cwd = req.get("cwd") or WORKSPACE
+        if not _within_workspace(cwd) and cwd != "/home/chv":
+            return {"ok": False, "error": "cwd outside workspace: %s" % cwd}
+        if kind == "codex":
+            if not os.path.exists(CELL_BIN):
+                return {"ok": False, "error": "chv-cell not found"}
+            full = [CELL_BIN, "run", "--", "python3", HOST_PY] + argv
+            env = _codex_env(req.get("env"))
+            as_user = None
+        else:
+            full = ["runuser", "-u", "chv", "--"] + argv
+            env = None
+            as_user = "chv"
+        task_id = uuid.uuid4().hex[:12]
+        os.makedirs(TASKS_LOG_DIR, exist_ok=True)
+        log_path = os.path.join(TASKS_LOG_DIR, task_id + ".log")
+        try:
+            log_fh = open(log_path, "ab", buffering=0)
+        except OSError as exc:
+            return {"ok": False, "error": "log open failed: %s" % exc}
+        try:
+            proc = subprocess.Popen(
+                full, cwd=cwd, stdout=log_fh, stderr=log_fh,
+                stdin=subprocess.DEVNULL, start_new_session=True,
+                env=env, close_fds=True)
+        except OSError as exc:
+            log_fh.close()
+            return {"ok": False, "error": "spawn failed: %s" % exc}
+        task = {"id": task_id, "kind": kind,
+                "argv_preview": argv[:4], "pid": proc.pid,
+                "state": "running", "started_at": time.time(),
+                "log": log_path,
+                "as_user": as_user or "root-via-cell"}
+        self.store.add(task)
+        self._register_proc(task_id, proc)
+        return {"ok": True, "id": task_id, "pid": proc.pid,
+                "log": log_path}
+
+    def op_read(self, req):
+        path = req.get("path")
+        if not isinstance(path, str) or not path:
+            return {"ok": False, "error": "path required"}
+        if not _within_workspace(path):
+            return {"ok": False, "error": "path outside workspace"}
+        try:
+            with open(path, "rb") as fh:
+                data = fh.read(MAX_FILE_BYTES + 1)
+        except OSError as exc:
+            return {"ok": False, "error": "read failed: %s" % exc}
+        truncated = len(data) > MAX_FILE_BYTES
+        return {"ok": True, "path": path,
+                "content": data[:MAX_FILE_BYTES].decode(
+                    "utf-8", errors="replace"),
+                "truncated": truncated}
+
+    def op_write(self, req):
+        path = req.get("path")
+        content = req.get("content")
+        if not isinstance(path, str) or not path:
+            return {"ok": False, "error": "path required"}
+        if not isinstance(content, str):
+            return {"ok": False, "error": "content must be a string"}
+        if not _within_workspace(path):
+            return {"ok": False, "error": "path outside workspace"}
+        try:
+            parent = os.path.dirname(path)
+            if parent:
+                os.makedirs(parent, exist_ok=True)
+            with open(path, "w") as fh:
+                fh.write(content)
+        except OSError as exc:
+            return {"ok": False, "error": "write failed: %s" % exc}
+        return {"ok": True, "path": path, "bytes": len(content)}
+
+    def op_task_status(self, req):
+        task_id = req.get("id")
+        if task_id:
+            task = self.store.get(task_id)
+            if task is None:
+                return {"ok": False, "error": "no such task: %s" % task_id}
+            return {"ok": True, "task": task}
+        return {"ok": True, "tasks": self.store.list()}
+
+    def op_task_kill(self, req):
+        task_id = req.get("id")
+        if not task_id:
+            return {"ok": False, "error": "id required"}
+        task = self.store.get(task_id)
+        if task is None:
+            return {"ok": False, "error": "no such task: %s" % task_id}
+        if task.get("state") != "running":
+            return {"ok": False,
+                    "error": "task not running: %s" % task.get("state")}
+        pid = task.get("pid")
+        sig = signal.SIGTERM
+        if req.get("signal") == "KILL":
+            sig = signal.SIGKILL
+        try:
+            os.kill(pid, sig)
+        except OSError as exc:
+            return {"ok": False, "error": "kill failed: %s" % exc}
+        self.store.update(task_id, state="killed",
+                          ended_at=time.time())
+        return {"ok": True, "id": task_id, "pid": pid}
+
+    def handle(self, req):
+        if not isinstance(req, dict):
+            return {"ok": False, "error": "request must be an object"}
+        op = req.get("op")
+        if op == "ping":
+            return {"ok": True, "service": "chv-execd",
+                    "pid": os.getpid()}
+        if op == "status":
+            return {"ok": True, "tasks": self.store.list()}
+        if op == "exec":
+            return self.op_exec(req)
+        if op == "spawn":
+            return self.op_spawn(req, kind="exec")
+        if op == "codex":
+            return self.op_spawn(req, kind="codex")
+        if op == "read":
+            return self.op_read(req)
+        if op == "write":
+            return self.op_write(req)
+        if op == "task-status":
+            return self.op_task_status(req)
+        if op == "task-kill":
+            return self.op_task_kill(req)
+        return {"ok": False, "error": "unknown op: %s" % (op,)}
+
+    # -- socket 服务 ------------------------------------------------------
+    def serve(self):
+        if os.path.exists(EXECD_SOCK):
+            os.remove(EXECD_SOCK)
+        srv = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+        srv.bind(EXECD_SOCK)
+        os.chmod(EXECD_SOCK, 0o600)
+        srv.listen(8)
+        srv.settimeout(0.5)
+        self._reaper.start()
+        print("chv-execd pid=%d sock=%s" % (os.getpid(), EXECD_SOCK),
+              flush=True)
+        try:
+            while not self._stop.is_set():
+                try:
+                    conn, _ = srv.accept()
+                except socket.timeout:
+                    continue
+                except OSError:
+                    break
+                with conn:
+                    uid = _peer_uid(conn)
+                    if uid not in ALLOWED_UIDS:
+                        resp = {"ok": False,
+                                "error": "uid %s not allowed" % (uid,)}
+                        try:
+                            conn.sendall(
+                                (json.dumps(resp) + "\n").encode())
+                        except OSError:
+                            pass
+                        continue
+                    try:
+                        conn.settimeout(10.0)
+                        buf = b""
+                        while len(buf) < MAX_REQUEST_BYTES:
+                            chunk = conn.recv(4096)
+                            if not chunk:
+                                break
+                            buf += chunk
+                            if buf.endswith(b"\n"):
+                                break
+                        req = json.loads(buf.decode())
+                        resp = self.handle(req)
+                    except (OSError, ValueError) as exc:
+                        resp = {"ok": False, "error": str(exc)}
+                    try:
+                        conn.sendall((json.dumps(resp) + "\n").encode())
+                    except OSError:
+                        pass
+        finally:
+            self._stop.set()
+            try:
+                srv.close()
+            except OSError:
+                pass
+            try:
+                os.remove(EXECD_SOCK)
+            except OSError:
+                pass
+
+    def stop(self):
+        self._stop.set()
+
+
+def main(argv=None):
+    argv = list(sys.argv[1:] if argv is None else argv)
+    if argv:
+        print("用法：chv-execd（无参数）", file=sys.stderr)
+        return 2
+    execd = Execd()
+
+    def _on_signal(signum, _frame):
+        execd.stop()
+
+    signal.signal(signal.SIGTERM, _on_signal)
+    signal.signal(signal.SIGINT, _on_signal)
+    execd.serve()
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

chv-guest/chv-syncd.py

@@ -0,0 +1,273 @@
+#!/usr/bin/env python3
+"""chv-syncd：客机运行时 sync 常驻（阶段 2 三分之一）。
+
+职责：常驻循环调用 /usr/local/bin/chv-sync 做 Gitea 双向同步，
+状态落盘 /run/chv/sync-status.json，socket /run/chv/syncd.sock
+接受 ping/status/sync-now。
+
+同步规则一条不改（与 chv-sync.sh 同款，复用它不重写 git 逻辑）：
+  - Gitea https://gitea.tose.top 是权威远端；启动 clone 选定仓
+    最新 HEAD（仍由 cloud-init runcmd 的 chv-sync boot 做；
+    syncd 只在仓已 clone 的前提下循环，仓不存在记 needs-boot
+    不擅自 clone——boot 须 root 写 credential，syncd 以 chv
+    身份跑，无权也不该碰）。
+  - 每轮先 pull --ff-only 再 push；pull 分叉即停住、跳过 push，
+    状态记 error、绝不 --force、不自动 rebase、不覆盖任何一方。
+  - 工作树脏时 pull 拒绝，同样记 error 等下一轮，不丢改动。
+  - push 只推已提交的提交；未提交改动不参与同步。
+  - token 只走 /home/chv/.git-credentials（0600），syncd
+    自身不读 guest-env、不打印、不记入状态文件与日志。
+
+以 chv 身份运行。默认每 300 秒一轮（CHV_SYNC_INTERVAL，
+下限 60 秒）；sync-now 立即触发一轮（轮内重复触发跳过）。
+"""
+import json
+import os
+import signal
+import socket
+import subprocess
+import sys
+import threading
+import time
+
+SYNC_SOCK = "/run/chv/syncd.sock"
+STATUS_PATH = "/run/chv/sync-status.json"
+WORKSPACE = "/home/chv/workspace"
+SYNC_BIN = "/usr/local/bin/chv-sync"
+DEFAULT_INTERVAL = 300.0
+MIN_INTERVAL = 60.0
+MAX_REQUEST_BYTES = 65536
+
+
+def _atomic_write(path, data: bytes):
+    tmp = "%s.tmp.%d" % (path, os.getpid())
+    with open(tmp, "wb") as fh:
+        fh.write(data)
+        fh.flush()
+        os.fsync(fh.fileno())
+    os.rename(tmp, path)
+
+
+def _read_json(path):
+    try:
+        with open(path) as fh:
+            return json.load(fh)
+    except (OSError, ValueError):
+        return None
+
+
+def resolve_repo(workspace=WORKSPACE):
+    """WORKSPACE 下唯一的 git 仓库；多个/零个返回 (None, reason)。"""
+    try:
+        names = sorted(os.listdir(workspace))
+    except OSError as exc:
+        return None, "workspace unreadable: %s" % exc
+    found = [os.path.join(workspace, name) for name in names
+             if os.path.isdir(os.path.join(workspace, name, ".git"))]
+    if len(found) == 1:
+        return found[0], None
+    if not found:
+        return None, "needs-boot: no cloned repo in workspace"
+    return None, "ambiguous: %d repos, explicit repo required" % len(found)
+
+
+def _run_sync(action, repo):
+    """跑 chv-sync pull/push；返回 (ok, tail)。tail 只取末行
+    （git 报错不含 token：remote URL 是干净 https，credential
+    走 store 文件），截断 500 字符。"""
+    try:
+        proc = subprocess.run(
+            [SYNC_BIN, action, repo], capture_output=True,
+            text=True, errors="replace", timeout=300)
+    except OSError as exc:
+        return False, "sync binary failed: %s" % exc
+    except subprocess.TimeoutExpired:
+        return False, "sync %s timeout after 300s" % action
+    tail = ((proc.stdout or "") + (proc.stderr or "")).strip()
+    tail = tail.splitlines()[-1] if tail else ""
+    return proc.returncode == 0, tail[:500]
+
+
+def _git_head(repo):
+    try:
+        proc = subprocess.run(
+            ["git", "-C", repo, "rev-parse", "HEAD"],
+            capture_output=True, text=True, errors="replace",
+            timeout=30)
+    except (OSError, subprocess.TimeoutExpired):
+        return None
+    if proc.returncode != 0:
+        return None
+    return proc.stdout.strip()
+
+
+class Syncd:
+    def __init__(self, interval=DEFAULT_INTERVAL,
+                 status_path=STATUS_PATH, workspace=WORKSPACE):
+        self.interval = max(interval, MIN_INTERVAL)
+        self.status_path = status_path
+        self.workspace = workspace
+        self._stop = threading.Event()
+        self._cycle_lock = threading.Lock()
+        self._cycle_running = False
+        self._status = _read_json(status_path) or {
+            "service": "chv-syncd", "last": "never",
+            "at": None, "head": None, "error": None,
+            "consecutive_errors": 0, "cycles": 0}
+
+    def _write_status(self):
+        _atomic_write(self.status_path,
+                      (json.dumps(self._status) + "\n").encode())
+
+    def run_cycle(self):
+        """一轮同步：先 pull 再 push；任一步失败即停住记 error。"""
+        if not self._cycle_lock.acquire(blocking=False):
+            return {"ok": False, "error": "cycle already running"}
+        try:
+            self._cycle_running = True
+            return self._cycle()
+        finally:
+            self._cycle_running = False
+            self._cycle_lock.release()
+
+    def _cycle(self):
+        repo, reason = resolve_repo(self.workspace)
+        now = time.time()
+        self._status["cycles"] = self._status.get("cycles", 0) + 1
+        if repo is None:
+            self._status.update(
+                {"last": "error", "at": now, "error": reason,
+                 "consecutive_errors":
+                     self._status.get("consecutive_errors", 0) + 1})
+            self._write_status()
+            return {"ok": False, "error": reason}
+        head_before = _git_head(repo)
+        ok, tail = _run_sync("pull", repo)
+        if not ok:
+            self._status.update(
+                {"last": "error", "at": now, "repo": repo,
+                 "head": head_before,
+                 "error": "pull failed: %s" % tail,
+                 "consecutive_errors":
+                     self._status.get("consecutive_errors", 0) + 1})
+            self._write_status()
+            return {"ok": False, "error": "pull failed: %s" % tail}
+        ok, tail = _run_sync("push", repo)
+        head_after = _git_head(repo)
+        if not ok:
+            self._status.update(
+                {"last": "error", "at": now, "repo": repo,
+                 "head": head_after,
+                 "error": "push failed: %s" % tail,
+                 "consecutive_errors":
+                     self._status.get("consecutive_errors", 0) + 1})
+            self._write_status()
+            return {"ok": False, "error": "push failed: %s" % tail}
+        self._status.update(
+            {"last": "ok", "at": now, "repo": repo,
+             "head": head_after, "head_before": head_before,
+             "error": None, "consecutive_errors": 0})
+        self._write_status()
+        return {"ok": True, "repo": repo, "head": head_after}
+
+    def handle(self, req):
+        if not isinstance(req, dict):
+            return {"ok": False, "error": "request must be an object"}
+        op = req.get("op")
+        if op == "ping":
+            return {"ok": True, "service": "chv-syncd",
+                    "pid": os.getpid()}
+        if op == "status":
+            return {"ok": True, "status": self._status}
+        if op == "sync-now":
+            return self.run_cycle()
+        return {"ok": False, "error": "unknown op: %s" % (op,)}
+
+    def _serve(self):
+        if os.path.exists(SYNC_SOCK):
+            os.remove(SYNC_SOCK)
+        srv = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+        srv.bind(SYNC_SOCK)
+        os.chmod(SYNC_SOCK, 0o600)
+        srv.listen(8)
+        srv.settimeout(0.5)
+        try:
+            while not self._stop.is_set():
+                try:
+                    conn, _ = srv.accept()
+                except socket.timeout:
+                    continue
+                except OSError:
+                    break
+                with conn:
+                    try:
+                        conn.settimeout(10.0)
+                        buf = b""
+                        while len(buf) < MAX_REQUEST_BYTES:
+                            chunk = conn.recv(4096)
+                            if not chunk:
+                                break
+                            buf += chunk
+                            if buf.endswith(b"\n"):
+                                break
+                        req = json.loads(buf.decode())
+                        resp = self.handle(req)
+                    except (OSError, ValueError) as exc:
+                        resp = {"ok": False, "error": str(exc)}
+                    try:
+                        conn.sendall((json.dumps(resp) + "\n").encode())
+                    except OSError:
+                        pass
+        finally:
+            try:
+                srv.close()
+            except OSError:
+                pass
+            try:
+                os.remove(SYNC_SOCK)
+            except OSError:
+                pass
+
+    def run(self):
+        thread = threading.Thread(target=self._serve, daemon=True)
+        thread.start()
+        print("chv-syncd pid=%d interval=%.0fs status=%s"
+              % (os.getpid(), self.interval, self.status_path),
+              flush=True)
+        try:
+            while not self._stop.is_set():
+                self.run_cycle()
+                self._stop.wait(self.interval)
+        finally:
+            self._stop.set()
+            thread.join(timeout=5)
+
+    def stop(self):
+        self._stop.set()
+
+
+def main(argv=None):
+    argv = list(sys.argv[1:] if argv is None else argv)
+    interval = float(os.environ.get("CHV_SYNC_INTERVAL")
+                     or DEFAULT_INTERVAL)
+    i = 0
+    while i < len(argv):
+        if argv[i] == "--interval" and i + 1 < len(argv):
+            interval = float(argv[i + 1])
+            i += 2
+        else:
+            print("用法：chv-syncd [--interval 秒]", file=sys.stderr)
+            return 2
+    syncd = Syncd(interval=interval)
+
+    def _on_signal(signum, _frame):
+        syncd.stop()
+
+    signal.signal(signal.SIGTERM, _on_signal)
+    signal.signal(signal.SIGINT, _on_signal)
+    syncd.run()
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

chv-guest/generate_lockfile.py

@@ -54,6 +54,11 @@ DECLARED_SOURCES = {
     # feat-chv-opt-landing（阶段 1）：数据盘挂载脚本，版本随
     # repo_commit（与 chv-sync 同款）。
     "chv-data-mount": "repo_commit",
+    # feat-chv-opt-landing（阶段 2）：客机运行时三分服务，版本
+    # 随 repo_commit（与 chv-sync 同款）。
+    "chv-daemon": "repo_commit",
+    "chv-execd": "repo_commit",
+    "chv-syncd": "repo_commit",
 }
 
 

cloud/chv/executor.py

@@ -1630,11 +1630,109 @@ class CloudHypervisorExecutor(Executor):
                               "--api-socket=%s" % socket_path]
                              + list(args))
         if getattr(result, "returncode", 0) not in (0, None):
+            # feat-chv-opt-landing（阶段 2）：stderr 尾巴进报错，
+            # 否则 tap-busy（Resource busy / os error 16）这类
+            # 原因只剩 returncode，调用方无法区分瞬时竞态与
+            # 真失败、重试 wrapper 无从下手。截断 300 字符。
+            tail = (getattr(result, "stderr", "") or "").strip()
+            tail = tail.splitlines()[-1] if tail else ""
             raise RuntimeError(
-                "ch-remote %s 失败：returncode=%s"
-                % (" ".join(args), getattr(result, "returncode")))
+                "ch-remote %s 失败：returncode=%s%s"
+                % (" ".join(args), getattr(result, "returncode"),
+                   (" stderr=%s" % tail[:300]) if tail else ""))
         return result
 
+    # -- tap 空闲轮询与退避重试（阶段 2，§6.1/§6.2 遗留） ------------
+    def _tap_wait_seconds(self):
+        try:
+            return max(0.0, float(
+                self._env.get("CHV_TAP_WAIT_TIMEOUT", 30)))
+        except (TypeError, ValueError):
+            return 30.0
+
+    def _tap_wait_interval(self):
+        try:
+            return max(0.5, float(
+                self._env.get("CHV_TAP_WAIT_INTERVAL", 2)))
+        except (TypeError, ValueError):
+            return 2.0
+
+    @staticmethod
+    def _is_tap_busy_error(exc):
+        text = str(exc)
+        lowered = text.lower()
+        return ("resource busy" in lowered
+                or "os error 16" in lowered
+                or ("tap" in lowered and "busy" in lowered))
+
+    def _tap_names_for_task(self):
+        """该任务 net 条目的 tap 名（去重去空）。"""
+        if not self.net_json:
+            return []
+        try:
+            entries = parse_net_entries(self.net_json)
+        except Exception:
+            return []
+        taps = []
+        for entry in entries:
+            tap = (entry.get("tap") or "").strip()
+            if tap and tap not in taps:
+                taps.append(tap)
+        return taps
+
+    def _wait_tap_idle(self, taps, timeout=None):
+        """等 tap 空闲：`ip link show <tap>` 不存在即空闲；
+        state DOWN / NO-CARRIER 即空闲；否则轮询到超时。
+        无 tap 配置、ip 不可用、探查抛错、输出为空时返回 True
+        （按旧行为直接尝试，重试 wrapper 仍会接住 busy 再
+        等一次）。诊断一律不用 pgrep -x cloud-hypervisor
+        （15 字符上限永远匹配不到），只看 tap 设备状态，
+        或 ps -eo pid,cmd / 直接读 /proc。"""
+        if not taps:
+            return True
+        if timeout is None:
+            timeout = self._tap_wait_seconds()
+        interval = self._tap_wait_interval()
+        deadline = time.monotonic() + max(0.0, timeout)
+        while True:
+            idle = True
+            for tap in taps:
+                try:
+                    result = self._call_runner(
+                        ["ip", "link", "show", tap], timeout=10)
+                except Exception:
+                    continue
+                if getattr(result, "returncode", 0) != 0:
+                    continue  # tap 不存在 = 空闲
+                out = getattr(result, "stdout", "") or ""
+                if not out.strip():
+                    continue  # 无输出 = 探查无果，按空闲处理
+                if "state DOWN" in out or "NO-CARRIER" in out:
+                    continue
+                idle = False
+            if idle:
+                return True
+            if time.monotonic() >= deadline:
+                return False
+            self.sleeper(interval)
+
+    def _retry_on_tap_busy(self, task, fn, what):
+        """tap-busy 退避重试：fn 抛含 Resource busy 的错时，
+        等 tap 空闲（CHV_TAP_WAIT_TIMEOUT，默认 30 秒）后
+        重试一次；第二次仍 busy 即原样抛（调用方失败路径
+        处理，restore 失败路径现已保留 seed.iso 可再试）。"""
+        try:
+            return fn()
+        except Exception as exc:
+            if not self._is_tap_busy_error(exc):
+                raise
+            taps = self._tap_names_for_task()
+            self._emit("vm_tap_busy_retry", task,
+                       "vm=%s %s tap busy，等 tap 空闲后重试一次"
+                       % (self.vm_name(task), what))
+            self._wait_tap_idle(taps)
+            return fn()
+
     def _registered_net_entries(self, exclude_vm=None):
         """已登记 VM 的 net 条目（H7）：扫描 state_dir/*/net.json
         （wake 成功后写，stop 时删）。文件损坏/缺失即跳过该
@@ -1858,7 +1956,7 @@ class CloudHypervisorExecutor(Executor):
         self._launch_api_only(task)
         self.wait_api_ready(task)
         self._check_api_socket_permissions(socket_path)
-        status, _ = self._api_call(
+        status, body = self._api_call(
             socket_path, "PUT", "/vm.create",
             self.build_vm_config(
                 task_disk, seed_disk=seed_disk,
@@ -1877,11 +1975,21 @@ class CloudHypervisorExecutor(Executor):
                     "net_registry_write_failed",
                     "vm=%s net 登记写失败，拒绝启动（缺登记会"
                     "漏判 tap/mac/ip 冲突）" % name)
-        status, _ = self._api_call(socket_path, "PUT", "/vm.boot")
-        if status not in (200, 204):
-            raise ChvFailure(
-                "vm_boot_failed",
-                "vm.boot 失败：status=%s" % status)
+        # feat-chv-opt-landing（阶段 2）：vm.boot 触 tap，停机
+        # →再启窗口的 tap 释放竞态在此处报 Resource busy；
+        # 响应体进报错（否则只剩 status，分不清瞬时竞态），
+        # busy 时等 tap 空闲后重试一次，不立即失败。
+        def _do_boot():
+            _status, _body = self._api_call(
+                socket_path, "PUT", "/vm.boot")
+            if _status not in (200, 204):
+                raise ChvFailure(
+                    "vm_boot_failed",
+                    "vm.boot 失败：status=%s body=%s"
+                    % (_status, _body))
+            return _status
+
+        self._retry_on_tap_busy(task, _do_boot, "vm.boot")
         self._emit("vm_boot", task, "vm=%s" % name)
         self.wait_guest_ready(task)
         # V-9：密钥已投递时等 guest-env 对 SSH 用户可读再报
@@ -2623,8 +2731,14 @@ class CloudHypervisorExecutor(Executor):
         self._launch_api_only(task)
         self.wait_api_ready(task)
         self._check_api_socket_permissions(self.api_socket(task))
-        self._ch_remote(task, "restore",
-                        "source_url=%s" % snapshot_url)
+        # feat-chv-opt-landing（阶段 2）：restore 触 tap，停机
+        # →恢复窗口的 tap 释放竞态在此处报 Resource busy；
+        # 等 tap 空闲后重试一次，不立即失败（见 _retry_on_tap_busy）。
+        self._retry_on_tap_busy(
+            task,
+            lambda: self._ch_remote(task, "restore",
+                                    "source_url=%s" % snapshot_url),
+            "restore")
         # feat-chv-cover100：与 _boot_vm 同款——恢复成功后登记
         # net.json，登记失败即拒恢复（P2-19 语义：审计 +
         # 返回 False + 调用方 ChvFailure）；restore_vm 的
@@ -2656,7 +2770,16 @@ class CloudHypervisorExecutor(Executor):
             self._restore_boot(task, snapshot_url, net_entries)
         except Exception:
             try:
-                self.stop_vm(task)
+                # feat-chv-opt-landing（阶段 2，§6.2 遗留缺陷）：
+                # 失败路径原先 stop_vm(task)（keep_disk=False）
+                # 会删 seed.iso，而快照 config.json 的 disks
+                # 同时引用 disk.raw 与 seed.iso，删了之后任何
+                # 重试 restore 都报 seed.iso ENOENT——失败清理
+                # 毁掉了恢复输入。现改 keep_disk=True：任务盘
+                # 与 seed.iso 都留，重试成为可能；残留盘由
+                # GC（有登记快照的受保护、无登记的按孤儿清）
+                # 与显式回收接手，不长期滞留。
+                self.stop_vm(task, keep_disk=True)
             except Exception:
                 pass
             raise

cloud/tests/test_chv_muse_p2.py

@@ -569,7 +569,8 @@ class BuildDryRunTest(unittest.TestCase):
             for name in ("build.sh", "buildinfo.py", "check_lockfile.py",
                          "generate_lockfile.py", "chv-sync.sh",
                          "chv-cell.py", "chv-broker.py", "chv-browser.py",
-                         "chv-data-mount.sh"):
+                         "chv-data-mount.sh", "chv-daemon.py",
+                         "chv-execd.py", "chv-syncd.py"):
                 shutil.copy2(ROOT / "chv-guest" / name,
                              os.path.join(guest, name))
             shutil.copy2(ROOT / "host.py", os.path.join(repo, "host.py"))
@@ -607,7 +608,10 @@ class BuildDryRunTest(unittest.TestCase):
             for needle in ("systemd-container", "chv-cell", "chv-broker",
                            "chv-browser", "chv-browser.service",
                            "chv-broker.service", "useradd --system",
-                           "systemctl enable chv-broker chv-browser"):
+                           "systemctl enable chv-broker chv-browser "
+                           "chv-daemon chv-execd chv-syncd",
+                           "chv-daemon.service", "chv-execd.service",
+                           "chv-syncd.service"):
                 self.assertIn(needle, out, needle)
             # P1 文件不在本分支：干跑只警告、不失败。
             self.assertIn("vsock_notify.py 不在仓库里", out)

cloud/tests/test_chv_opt_stage2.py

@@ -0,0 +1,691 @@
+"""Cloud Hypervisor 优化落地阶段 2（feat-chv-opt-landing）测试。
+
+只用标准库与 mock runner/launcher/api_client，绝不启动真实
+VM（与 test_chv_opt_stage1.py 同款边界）。覆盖：
+- 客机运行时三分：daemon 心跳/快照配合、execd 任务登记与
+  重启认领、syncd 只调 chv-sync pull/push（规则一条不改）
+- 阶段 1 遗留修复：restore 失败后 seed.iso 仍在；tap 空闲
+  轮询 + vm.boot/restore 的 tap-busy 退避重试一次
+- 构建接线：build.sh 拷入三服务 + systemd 单元
+  （Restart=always）+ enable；lockfile/buildinfo 登记三服务；
+  99-chv-sync.cfg 的 runcmd 顺序不变（restart ssh → chown
+  guest-env → data-mount → chv-sync boot）
+"""
+
+import importlib.util
+import json
+import os
+import socket
+import sys
+import tempfile
+import threading
+import time
+import unittest
+from pathlib import Path
+from unittest import mock
+
+try:
+    from cloud.chv import ChvFailure
+    from cloud.chv import CloudHypervisorExecutor
+    from cloud.chv.disk import record_snapshot
+except ImportError:  # discover -s cloud/tests 时把项目根目录补进 sys.path
+    sys.path.insert(0, str(Path(__file__).resolve().parents[2]))
+    from cloud.chv import ChvFailure
+    from cloud.chv import CloudHypervisorExecutor
+    from cloud.chv.disk import record_snapshot
+
+
+def _load_guest_script(name):
+    path = os.path.join(Path(__file__).resolve().parents[2],
+                        "chv-guest", name)
+    spec = importlib.util.spec_from_file_location(
+        "stage2_" + name[:-3], path)
+    mod = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(mod)
+    return mod
+
+
+class FakeResult:
+    def __init__(self, returncode=0, stdout="", stderr=""):
+        self.returncode = returncode
+        self.stdout = stdout
+        self.stderr = stderr
+
+
+class FakeProc:
+    def __init__(self, alive=True):
+        self._alive = alive
+
+    def poll(self):
+        return None if self._alive else 1
+
+    def terminate(self):
+        self._alive = False
+
+    def wait(self, timeout=None):
+        return 0
+
+    def kill(self):
+        self._alive = False
+
+
+def _write(path, content=b"x"):
+    with open(path, "wb") as fh:
+        fh.write(content)
+    os.chmod(path, 0o755)
+    return path
+
+
+def _repo(*parts):
+    return os.path.join(Path(__file__).resolve().parents[2], *parts)
+
+
+# -- daemon：心跳与快照配合 ---------------------------------------------------
+class DaemonTest(unittest.TestCase):
+    def setUp(self):
+        self.tmp = tempfile.TemporaryDirectory()
+        self.mod = _load_guest_script("chv-daemon.py")
+        self.mod.HEARTBEAT_PATH = os.path.join(
+            self.tmp.name, "heartbeat.json")
+        self.mod.SNAPSHOT_READY_PATH = os.path.join(
+            self.tmp.name, "snapshot-ready.json")
+        self.mod.EXECD_TASKS = os.path.join(
+            self.tmp.name, "execd-tasks.json")
+        self.mod.SYNC_STATUS = os.path.join(
+            self.tmp.name, "sync-status.json")
+        self.mod.WORKSPACE = self.tmp.name
+
+    def tearDown(self):
+        self.tmp.cleanup()
+
+    def test_heartbeat_fields_and_seq_continues(self):
+        daemon = self.mod.Daemon(interval=10)
+        first = daemon.write_heartbeat()
+        self.assertEqual(first["service"], "chv-daemon")
+        self.assertEqual(first["pid"], os.getpid())
+        self.assertIn("loadavg", first)
+        self.assertIn("mem", first)
+        self.assertIn("workspace_free_bytes", first)
+        self.assertEqual(first["seq"], 1)
+        daemon.write_heartbeat()
+        # 新 daemon 启动读旧文件续号，不是从 1 重来。
+        daemon2 = self.mod.Daemon(interval=10)
+        third = daemon2.write_heartbeat()
+        self.assertEqual(third["seq"], 3)
+
+    def test_handle_ping_status_unknown(self):
+        self.assertTrue(self.mod.handle_request(
+            {"op": "ping"})["ok"])
+        status = self.mod.handle_request({"op": "status"})
+        self.assertTrue(status["ok"])
+        self.assertIsNone(status["heartbeat"])
+        self.assertFalse(self.mod.handle_request(
+            {"op": "bogus"})["ok"])
+        self.assertFalse(self.mod.handle_request(
+            "not-a-dict")["ok"])
+
+    def test_prepare_snapshot_refuses_when_execd_unreachable(self):
+        with mock.patch.object(
+                self.mod, "_ask_execd_status",
+                return_value=(None, "execd-unreachable: refused")):
+            resp = self.mod.handle_request({"op": "prepare-snapshot"})
+        self.assertFalse(resp["ok"])
+        self.assertIn("execd-unreachable", resp["reason"])
+        self.assertFalse(os.path.exists(
+            self.mod.SNAPSHOT_READY_PATH))
+
+    def test_prepare_snapshot_refuses_running_task(self):
+        with mock.patch.object(
+                self.mod, "_ask_execd_status",
+                return_value=({"ok": True, "tasks": [
+                    {"id": "abc", "state": "running"}]}, None)):
+            resp = self.mod.handle_request({"op": "prepare-snapshot"})
+        self.assertFalse(resp["ok"])
+        self.assertEqual(resp["reason"], "task-running")
+        self.assertEqual(resp["running"], ["abc"])
+
+    def test_prepare_snapshot_ok_writes_marker(self):
+        with mock.patch.object(
+                self.mod, "_ask_execd_status",
+                return_value=({"ok": True, "tasks": [
+                    {"id": "abc", "state": "completed", "rc": 0}]},
+                    None)):
+            resp = self.mod.handle_request({"op": "prepare-snapshot"})
+        self.assertTrue(resp["ok"])
+        marker = json.load(open(self.mod.SNAPSHOT_READY_PATH))
+        self.assertIn("at", marker)
+
+
+# -- execd：任务登记、路径 confinement、codex 环境白名单 ----------------------
+class ExecdTest(unittest.TestCase):
+    def setUp(self):
+        self.tmp = tempfile.TemporaryDirectory()
+        self.dir = self.tmp.name
+        self.mod = _load_guest_script("chv-execd.py")
+        self.mod.TASKS_PATH = os.path.join(self.dir, "tasks.json")
+        self.mod.TASKS_LOG_DIR = os.path.join(self.dir, "tasks")
+        self.mod.WORKSPACE = os.path.join(self.dir, "workspace")
+        os.makedirs(self.mod.WORKSPACE, exist_ok=True)
+
+    def tearDown(self):
+        self.tmp.cleanup()
+
+    def _write_tasks(self, tasks):
+        with open(self.mod.TASKS_PATH, "w") as fh:
+            json.dump({"tasks": tasks}, fh)
+
+    def test_taskstore_reattach_dead_pid_unknown(self):
+        self._write_tasks([{
+            "id": "dead1", "kind": "exec", "pid": 999999,
+            "state": "running", "started_at": 1.0}])
+        store = self.mod.TaskStore(self.mod.TASKS_PATH)
+        task = store.get("dead1")
+        self.assertEqual(task["state"], "unknown")
+        self.assertIn("unrecoverable", task["note"])
+
+    def test_taskstore_reattach_live_pid_stays_running(self):
+        self._write_tasks([{
+            "id": "live1", "kind": "exec", "pid": os.getpid(),
+            "state": "running", "started_at": 1.0}])
+        store = self.mod.TaskStore(self.mod.TASKS_PATH)
+        task = store.get("live1")
+        self.assertEqual(task["state"], "running")
+        self.assertIn("reattached", task["note"])
+
+    def test_read_write_roundtrip_and_confinement(self):
+        execd = self.mod.Execd(tasks_path=self.mod.TASKS_PATH)
+        inside = os.path.join(self.mod.WORKSPACE, "sub", "a.txt")
+        out = execd.op_write({"path": inside, "content": "hello-stage2"})
+        self.assertTrue(out["ok"])
+        back = execd.op_read({"path": inside})
+        self.assertEqual(back["content"], "hello-stage2")
+        # 越界：工作区外、.. 穿透都拒绝。
+        self.assertFalse(execd.op_write(
+            {"path": "/etc/passwd", "content": "x"})["ok"])
+        self.assertFalse(execd.op_read(
+            {"path": os.path.join(
+                self.mod.WORKSPACE, "..", "tasks.json")})["ok"])
+        self.assertFalse(execd.op_write(
+            {"path": inside, "content": 123})["ok"])
+
+    def test_exec_validates_argv_and_cwd(self):
+        execd = self.mod.Execd(tasks_path=self.mod.TASKS_PATH)
+        self.assertFalse(execd.op_exec({"argv": []})["ok"])
+        self.assertFalse(execd.op_exec({"argv": "id"})["ok"])
+        self.assertFalse(execd.op_exec(
+            {"argv": ["id"], "cwd": "/etc"})["ok"])
+
+    def test_codex_env_allowlist(self):
+        env = self.mod._codex_env({
+            "OPENAI_API_KEY": "sk-test",
+            "CODEX_FOO": "yes",
+            "GITEA_TOKEN": "must-not-pass",
+            "HOME": "/root",
+            "CHV_MODEL_BASE": "http://x",
+            "PLAYWRIGHT_BROWSERS_PATH": "/custom"})
+        self.assertEqual(env["OPENAI_API_KEY"], "sk-test")
+        self.assertEqual(env["CODEX_FOO"], "yes")
+        self.assertEqual(env["CHV_MODEL_BASE"], "http://x")
+        self.assertNotIn("GITEA_TOKEN", env)
+        # HOME 固定为 chv 家目录，不接受调用方传入。
+        self.assertEqual(env["HOME"], "/home/chv")
+
+    def test_socket_ping_and_read_write(self):
+        sock_path = os.path.join(self.dir, "execd.sock")
+        self.mod.EXECD_SOCK = sock_path
+        execd = self.mod.Execd(tasks_path=self.mod.TASKS_PATH)
+        thread = threading.Thread(target=execd.serve, daemon=True)
+        thread.start()
+        try:
+            for _ in range(50):
+                if os.path.exists(sock_path):
+                    break
+                time.sleep(0.1)
+            self.assertTrue(os.path.exists(sock_path))
+
+            def call(req):
+                sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+                sock.settimeout(5)
+                sock.connect(sock_path)
+                sock.sendall((json.dumps(req) + "\n").encode())
+                buf = b""
+                while not buf.endswith(b"\n"):
+                    chunk = sock.recv(4096)
+                    if not chunk:
+                        break
+                    buf += chunk
+                sock.close()
+                return json.loads(buf.decode())
+
+            self.assertTrue(call({"op": "ping"})["ok"])
+            path = os.path.join(self.mod.WORKSPACE, "via-sock.txt")
+            self.assertTrue(call({"op": "write", "path": path,
+                                 "content": "sock-ok"})["ok"])
+            back = call({"op": "read", "path": path})
+            self.assertEqual(back["content"], "sock-ok")
+            self.assertFalse(call({"op": "bogus"})["ok"])
+            status = call({"op": "status"})
+            self.assertTrue(status["ok"])
+        finally:
+            execd.stop()
+            thread.join(timeout=5)
+
+
+# -- syncd：只调 chv-sync，规则不改 -------------------------------------------
+class SyncdTest(unittest.TestCase):
+    def setUp(self):
+        self.tmp = tempfile.TemporaryDirectory()
+        self.dir = self.tmp.name
+        self.mod = _load_guest_script("chv-syncd.py")
+        self.mod.WORKSPACE = os.path.join(self.dir, "workspace")
+        os.makedirs(self.mod.WORKSPACE, exist_ok=True)
+        self.status_path = os.path.join(self.dir, "sync-status.json")
+
+    def tearDown(self):
+        self.tmp.cleanup()
+
+    def _repo_dir(self, name="chv-sync-test"):
+        path = os.path.join(self.mod.WORKSPACE, name)
+        os.makedirs(os.path.join(path, ".git"), exist_ok=True)
+        return path
+
+    def test_resolve_repo_zero_one_many(self):
+        repo, reason = self.mod.resolve_repo(self.mod.WORKSPACE)
+        self.assertIsNone(repo)
+        self.assertIn("needs-boot", reason)
+        only = self._repo_dir()
+        repo, _ = self.mod.resolve_repo(self.mod.WORKSPACE)
+        self.assertEqual(repo, only)
+        self._repo_dir("other")
+        repo, reason = self.mod.resolve_repo(self.mod.WORKSPACE)
+        self.assertIsNone(repo)
+        self.assertIn("ambiguous", reason)
+
+    def test_cycle_pull_fail_stops_before_push(self):
+        repo = self._repo_dir()
+        syncd = self.mod.Syncd(interval=300,
+                               status_path=self.status_path,
+                               workspace=self.mod.WORKSPACE)
+        calls = []
+        with mock.patch.object(
+                self.mod, "_run_sync",
+                side_effect=lambda a, r: (
+                    calls.append(a),
+                    (False, "non-fast-forward"))[1]):
+            with mock.patch.object(
+                    self.mod, "_git_head", return_value="abc123"):
+                out = syncd.run_cycle()
+        self.assertFalse(out["ok"])
+        self.assertEqual(calls, ["pull"])  # pull 失败即停，不 push
+        with open(self.status_path) as fh:
+            status = json.load(fh)
+        self.assertEqual(status["last"], "error")
+        self.assertIn("pull failed", status["error"])
+        self.assertEqual(status["head"], "abc123")
+        self.assertEqual(status["consecutive_errors"], 1)
+
+    def test_cycle_pull_push_ok(self):
+        repo = self._repo_dir()
+        syncd = self.mod.Syncd(interval=300,
+                               status_path=self.status_path,
+                               workspace=self.mod.WORKSPACE)
+        calls = []
+        with mock.patch.object(
+                self.mod, "_run_sync",
+                side_effect=lambda a, r: (
+                    calls.append(a), (True, ""))[1]):
+            with mock.patch.object(
+                    self.mod, "_git_head",
+                    side_effect=["before", "after"]):
+                out = syncd.run_cycle()
+        self.assertTrue(out["ok"])
+        self.assertEqual(calls, ["pull", "push"])
+        with open(self.status_path) as fh:
+            status = json.load(fh)
+        self.assertEqual(status["last"], "ok")
+        self.assertEqual(status["head"], "after")
+        self.assertEqual(status["consecutive_errors"], 0)
+
+    def test_syncd_source_never_forces(self):
+        with open(_repo("chv-guest", "chv-syncd.py")) as fh:
+            text = fh.read()
+        # 只查可执行代码里的字符串字面量与命令（文档里“绝不
+        # --force / 不自动 rebase”是规则说明，不是命令）。
+        for banned in ('"--force"', '"rebase"', "'--force'",
+                       "reset --hard", '"GITEA_TOKEN"'):
+            self.assertNotIn(banned, text)
+        # syncd 只调 chv-sync（pull/push）与 git rev-parse，
+        # 不直接跑 git pull/push/clone。
+        self.assertIn('[SYNC_BIN, action, repo]', text)
+        self.assertNotIn('"pull"', text.replace(
+            '"pull", repo', ''))
+        self.assertNotIn('["git", "-C", repo, "pull"', text)
+        self.assertNotIn('["git", "-C", repo, "push"', text)
+
+    def test_chv_sync_rules_unchanged(self):
+        with open(_repo("chv-guest", "chv-sync.sh")) as fh:
+            lines = fh.readlines()
+        # 只查非注释行里的 git 命令：含 --force / rebase 的行
+        # 必须是 die/echo 文案（“绝不 --force”是规则说明），
+        # 不能是真正的 git 调用。
+        code = [ln for ln in lines
+                if not ln.strip().startswith("#")]
+        joined = "".join(code)
+        self.assertIn("pull --ff-only", joined)
+        offending = [ln.strip() for ln in code
+                     if ("--force" in ln or "rebase" in ln)
+                     and "die " not in ln and "echo " not in ln]
+        self.assertEqual(offending, [])
+        self.assertIn("不自动 rebase", "".join(lines))
+
+
+# -- 构建接线 -----------------------------------------------------------------
+class BuildWiringTest(unittest.TestCase):
+    def test_build_sh_wires_three_services(self):
+        with open(_repo("chv-guest", "build.sh")) as fh:
+            text = fh.read()
+        for name in ("chv-daemon", "chv-execd", "chv-syncd"):
+            self.assertIn("%s.py:/usr/local/bin/" % name, text)
+            self.assertIn("/usr/local/bin/%s" % name, text)
+            self.assertIn("%s.service" % name, text)
+        # Restart=always 恰好 3 处（三个阶段 2 服务；broker /
+        # browser 仍是 on-failure，不动它们），kill -9 /
+        # kill -TERM 都自动拉起，只有 systemctl stop 才干净停。
+        self.assertEqual(text.count("Restart=always"), 3)
+        self.assertEqual(text.count("Restart=on-failure"), 2)
+        for name, desc in (
+                ("chv-daemon", "CHV guest runtime daemon"),
+                ("chv-execd", "CHV guest exec daemon"),
+                ("chv-syncd", "CHV Gitea sync daemon")):
+            self.assertIn(desc, text)
+            self.assertIn("%s.service" % name, text)
+        self.assertIn(
+            "systemctl enable chv-broker chv-browser "
+            "chv-daemon chv-execd chv-syncd", text)
+        # 99-chv-sync.cfg 的 runcmd 顺序一条不改。
+        cfg_line = next(
+            line for line in text.splitlines()
+            if "99-chv-sync.cfg" in line and "runcmd" in line)
+        self.assertLess(cfg_line.index("systemctl restart ssh"),
+                        cfg_line.index("chown chv:chv /etc/chv/guest-env"))
+        self.assertLess(cfg_line.index("chv-data-mount >>"),
+                        cfg_line.index("chv-sync boot"))
+
+    def test_lockfile_and_buildinfo_declare_services(self):
+        spec = importlib.util.spec_from_file_location(
+            "stage2_buildinfo",
+            _repo("chv-guest", "buildinfo.py"))
+        buildinfo = importlib.util.module_from_spec(spec)
+        spec.loader.exec_module(buildinfo)
+        for name in ("chv-daemon", "chv-execd", "chv-syncd"):
+            self.assertIn(name, buildinfo.BASE_CONTENTS)
+        for name in ("check_lockfile.py", "generate_lockfile.py"):
+            spec = importlib.util.spec_from_file_location(
+                "stage2_" + name[:-3], _repo("chv-guest", name))
+            mod = importlib.util.module_from_spec(spec)
+            spec.loader.exec_module(mod)
+            for svc in ("chv-daemon", "chv-execd", "chv-syncd"):
+                self.assertEqual(mod.DECLARED_SOURCES[svc],
+                                 "repo_commit")
+
+
+# -- executor：restore 失败留 seed.iso + tap 退避 ------------------------------
+class ChvOpt2Case(unittest.TestCase):
+    def setUp(self):
+        self.tmp = tempfile.TemporaryDirectory()
+        self.dir = self.tmp.name
+        self.binary = _write(os.path.join(self.dir, "cloud-hypervisor"))
+        self.ch_remote = _write(os.path.join(self.dir, "ch-remote"))
+        self.kernel = _write(os.path.join(self.dir, "vmlinux"))
+        self.rootfs = _write(os.path.join(self.dir, "base.qcow2"),
+                             b"R" * 100)
+        self.ssh_key = _write(os.path.join(self.dir, "id_chv"))
+        self.kvm = _write(os.path.join(self.dir, "kvm"))
+        self.cpuinfo = os.path.join(self.dir, "cpuinfo")
+        with open(self.cpuinfo, "w") as fh:
+            fh.write("flags : fpu vmx sse\n")
+        self.state_dir = os.path.join(self.dir, "state")
+        self.calls = []
+        self.api_calls = []
+        self.launches = []
+        self.vm_states = {}
+
+    def tearDown(self):
+        self.tmp.cleanup()
+
+    def make_exec(self, runner=None, api_client=None, launcher=None,
+                  env_extra=None, **overrides):
+        env = {"CHV_EGRESS_PROXY": "http://10.0.0.1:8888",
+               "CHV_HOST_KEY_MODE": "keyscan",
+               "CHV_SSH_FORWARD": "1",
+               "CHV_NET_JSON": json.dumps([{
+                   "tap": "tap-chv", "mac": "02:00:00:00:00:11"}]),
+               "CHV_TAP_WAIT_TIMEOUT": "0",
+               "CHV_TAP_WAIT_INTERVAL": "0.5"}
+        if env_extra:
+            env.update(env_extra)
+        if runner is None:
+            runner = self._default_runner
+        if api_client is None:
+            api_client = self._default_api
+        if launcher is None:
+            launcher = self._default_launcher
+        kwargs = dict(
+            binary=self.binary, ch_remote=self.ch_remote,
+            kernel=self.kernel, rootfs=self.rootfs,
+            ssh_key=self.ssh_key, kvm_path=self.kvm,
+            cpuinfo_path=self.cpuinfo, state_dir=self.state_dir,
+            runner=runner, launcher=launcher, api_client=api_client,
+            sleeper=lambda s: None, env=env)
+        kwargs.update(overrides)
+        return CloudHypervisorExecutor(**kwargs)
+
+    def _default_runner(self, cmd, timeout=None):
+        self.calls.append(list(cmd))
+        if cmd[0] == "ssh-keyscan":
+            return FakeResult(
+                0, "[127.0.0.1]:2222 ssh-ed25519 AAAAB3test\n", "")
+        if cmd[0] == "ssh":
+            return FakeResult(0, "", "")
+        if cmd[:3] == ["ip", "link", "show"]:
+            # tap 不存在（rc=1）= 空闲，立即返回不等待。
+            return FakeResult(1, "", "")
+        return FakeResult(0, "", "")
+
+    def _default_api(self, socket_path, method, path, payload=None):
+        self.api_calls.append((method, path, payload))
+        if path == "/vm.info":
+            state = self.vm_states.get(
+                os.path.basename(socket_path)[:-len(".sock")])
+            if state:
+                return (200, {"state": state})
+            return (200, {})
+        return (200, {})
+
+    def _default_launcher(self, cmd):
+        self.launches.append(list(cmd))
+        return FakeProc(alive=True)
+
+    def _seed_vm_files(self, vm):
+        vm_dir = os.path.join(self.state_dir, vm)
+        os.makedirs(vm_dir, exist_ok=True)
+        seed = os.path.join(vm_dir, "seed.iso")
+        disk = os.path.join(vm_dir, "disk.raw")
+        with open(seed, "wb") as fh:
+            fh.write(b"SEED")
+        with open(disk, "wb") as fh:
+            fh.write(b"DISK")
+        return seed, disk
+
+    def _snap_url(self, vm, name="snap1"):
+        snap_dir = os.path.join(self.state_dir, vm, name)
+        os.makedirs(snap_dir, exist_ok=True)
+        record_snapshot(self.state_dir, vm,
+                        "file://" + snap_dir, 20.0,
+                        tenant_id="tenant-a")
+        return "file://" + snap_dir
+
+
+class RestoreKeepsSeedTest(ChvOpt2Case):
+    def test_restore_failure_keeps_seed_iso(self):
+        url = self._snap_url("chv-a")
+        seed, disk = self._seed_vm_files("chv-a")
+        ex = self.make_exec()
+        calls = {"n": 0}
+
+        def failing_restore(task_or_name, *args):
+            calls["n"] += 1
+            raise RuntimeError(
+                "ch-remote restore 失败：returncode=1 "
+                "stderr=Cannot open disk path")
+        with mock.patch.object(ex, "_ch_remote",
+                               side_effect=failing_restore):
+            with self.assertRaises(RuntimeError):
+                ex.restore_vm({"id": "a", "project_id": "tenant-a"},
+                              url)
+        # 非 tap-busy 失败：不重试，但 seed.iso 与任务盘都在，
+        # 重试 restore 仍有输入。
+        self.assertEqual(calls["n"], 1)
+        self.assertTrue(os.path.exists(seed))
+        self.assertTrue(os.path.exists(disk))
+
+    def test_restore_tap_busy_retries_once_then_keeps_seed(self):
+        url = self._snap_url("chv-a")
+        seed, disk = self._seed_vm_files("chv-a")
+        ex = self.make_exec()
+        events = []
+        ex.audit_callback = lambda e, t, d, k: events.append(e)
+        calls = {"n": 0}
+
+        def busy_restore(task_or_name, *args):
+            calls["n"] += 1
+            raise RuntimeError(
+                "ch-remote restore 失败：returncode=1 "
+                "stderr=Resource busy (os error 16)")
+        with mock.patch.object(ex, "_ch_remote",
+                               side_effect=busy_restore):
+            with self.assertRaises(RuntimeError):
+                ex.restore_vm({"id": "a", "project_id": "tenant-a"},
+                              url)
+        # tap-busy：等空闲后重试一次（共 2 次），仍失败才抛；
+        # seed.iso 与盘仍在，可再试。
+        self.assertEqual(calls["n"], 2)
+        self.assertIn("vm_tap_busy_retry", events)
+        self.assertTrue(os.path.exists(seed))
+        self.assertTrue(os.path.exists(disk))
+
+    def test_restore_tap_busy_second_try_succeeds(self):
+        url = self._snap_url("chv-a")
+        self._seed_vm_files("chv-a")
+        ex = self.make_exec()
+        calls = {"n": 0}
+
+        def flaky_restore(task_or_name, *args):
+            calls["n"] += 1
+            if calls["n"] == 1:
+                raise RuntimeError(
+                    "ch-remote restore 失败：returncode=1 "
+                    "stderr=Resource busy (os error 16)")
+            return FakeResult(0, "", "")
+        with mock.patch.object(ex, "_ch_remote",
+                               side_effect=flaky_restore):
+            with mock.patch.object(ex, "resume_vm",
+                                   return_value=None), \
+                    mock.patch.object(ex, "wait_guest_ready",
+                                      return_value=None):
+                out = ex.restore_vm(
+                    {"id": "a", "project_id": "tenant-a"}, url)
+        self.assertEqual(calls["n"], 2)
+        self.assertEqual(out["mode"], "restored")
+
+
+class TapWaitTest(ChvOpt2Case):
+    def test_is_tap_busy_error(self):
+        ex = self.make_exec()
+        self.assertTrue(ex._is_tap_busy_error(RuntimeError(
+            "Resource busy (os error 16)")))
+        self.assertTrue(ex._is_tap_busy_error(ChvFailure(
+            "vm_boot_failed", "vm.boot 失败：status=500 "
+            "body=Resource busy (os error 16)")))
+        self.assertFalse(ex._is_tap_busy_error(RuntimeError(
+            "Cannot open disk path ... No such file")))
+        self.assertFalse(ex._is_tap_busy_error(ChvFailure(
+            "vm_boot_failed", "vm.boot 失败：status=500 body=boom")))
+
+    def test_wait_tap_idle_states(self):
+        ex = self.make_exec()
+
+        def down_runner(cmd, timeout=None):
+            if cmd[:3] == ["ip", "link", "show"]:
+                return FakeResult(
+                    0, "3: tap-chv: <NO-CARRIER,BROADCAST,MULTICAST,UP> "
+                    "mtu 1500 state DOWN mode DEFAULT", "")
+            return FakeResult(0, "", "")
+        ex.runner = down_runner
+        self.assertTrue(ex._wait_tap_idle(["tap-chv"], timeout=0))
+
+        def up_runner(cmd, timeout=None):
+            if cmd[:3] == ["ip", "link", "show"]:
+                return FakeResult(
+                    0, "3: tap-chv: <BROADCAST,MULTICAST,UP,LOWER_UP> "
+                    "mtu 1500 state UP mode DEFAULT", "")
+            return FakeResult(0, "", "")
+        ex.runner = up_runner
+        self.assertFalse(ex._wait_tap_idle(["tap-chv"], timeout=0))
+
+        def absent_runner(cmd, timeout=None):
+            if cmd[:3] == ["ip", "link", "show"]:
+                return FakeResult(1, "", "")
+            return FakeResult(0, "", "")
+        ex.runner = absent_runner
+        self.assertTrue(ex._wait_tap_idle(["tap-chv"], timeout=0))
+        self.assertTrue(ex._wait_tap_idle([], timeout=0))
+
+    def test_boot_tap_busy_retries_once(self):
+        ex = self.make_exec()
+        boots = {"n": 0}
+
+        def flaky_api(socket_path, method, path, payload=None):
+            self.api_calls.append((method, path, payload))
+            if path == "/vm.boot":
+                boots["n"] += 1
+                if boots["n"] == 1:
+                    return (500, "Resource busy (os error 16)")
+                return (204, {})
+            return (200, {})
+        ex.api_client = flaky_api
+        with mock.patch.object(ex, "wait_guest_ready",
+                               return_value=None), \
+                mock.patch.object(ex, "_wait_guest_env_usable",
+                                  return_value=None):
+            ex._boot_vm({"id": "a"}, "chv-a",
+                        os.path.join(self.state_dir, "chv-a",
+                                     "disk.raw"),
+                        None, [])
+        self.assertEqual(boots["n"], 2)
+
+    def test_boot_non_busy_failure_no_retry(self):
+        ex = self.make_exec()
+        boots = {"n": 0}
+
+        def failing_api(socket_path, method, path, payload=None):
+            if path == "/vm.boot":
+                boots["n"] += 1
+                return (500, "Cannot open disk path")
+            return (200, {})
+        ex.api_client = failing_api
+        with mock.patch.object(ex, "wait_guest_ready",
+                               return_value=None), \
+                mock.patch.object(ex, "_wait_guest_env_usable",
+                                  return_value=None):
+            with self.assertRaises(ChvFailure) as ctx:
+                ex._boot_vm({"id": "a"}, "chv-a",
+                            os.path.join(self.state_dir, "chv-a",
+                                         "disk.raw"),
+                            None, [])
+        self.assertEqual(ctx.exception.kind, "vm_boot_failed")
+        self.assertEqual(boots["n"], 1)
+
+
+if __name__ == "__main__":
+    unittest.main()