编译Android 13车载版时“Unknown qemu_device”错误的解决方法

问题描述 #

编译Android 13的AOSP CAR X86_64（Lunch 11）时，进度到98%失败，提示unknown type qemu_device。尝试android-13.0.0_r74和r69分支均未成功，未找到相关解决方案。

编译错误日志 #

build/make/core/soong_config.mk:209: warning: BOARD_PLAT_PUBLIC_SEPOLICY_DIR has been deprecated. Use SYSTEM_EXT_PUBLIC_SEPOLICY_DIRS instead.
build/make/core/soong_config.mk:210: warning: BOARD_PLAT_PRIVATE_SEPOLICY_DIR has been deprecated. Use SYSTEM_EXT_PRIVATE_SEPOLICY_DIRS instead.
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=13
TARGET_PRODUCT=aosp_car_x86_64
TARGET_BUILD_VARIANT=userdebug
TARGET_BUILD_TYPE=release
TARGET_ARCH=x86_64
TARGET_ARCH_VARIANT=x86_64
TARGET_2ND_ARCH=x86
TARGET_2ND_ARCH_VARIANT=x86_64
HOST_ARCH=x86_64
HOST_2ND_ARCH=x86
HOST_OS=linux
HOST_OS_EXTRA=Linux-6.2.0-26-generic-x86_64-Ubuntu-22.04.3-LTS
HOST_CROSS_OS=windows
HOST_CROSS_ARCH=x86
HOST_CROSS_2ND_ARCH=x86_64
HOST_BUILD_TYPE=release
BUILD_ID=TQ3A.230605.012
OUT_DIR=out
PRODUCT_SOONG_NAMESPACES=device/generic/goldfish device/generic/goldfish-opengl hardware/google/camera hardware/google/camera/devices/EmulatedCamera
============================================
build/make/core/build_id.mk was modified, regenerating...
build/make/core/version_defaults.mk was modified, regenerating...
[ 98% 1032/1048] including system/sepolicy/Android.mk ...
system/sepolicy/Android.mk:57: warning: BOARD_PLAT_PUBLIC_SEPOLICY_DIR has been deprecated. Use SYSTEM_EXT_PUBLIC_SEPOLICY_DIRS instead.
system/sepolicy/Android.mk:62: warning: BOARD_PLAT_PRIVATE_SEPOLICY_DIR has been deprecated. Use SYSTEM_EXT_PRIVATE_SEPOLICY_DIRS instead.
[  1% 1155/68889] //system/sepolicy:sepolicy_neverallows_vendor Neverallow check: sepolicy_neverallows_vendor
FAILED: out/soong/.intermediates/system/sepolicy/sepolicy_neverallows_vendor/policy
out/host/linux-x86/bin/checkpolicy -M -c 30 -o out/soong/.intermediates/system/sepolicy/sepolicy_neverallows_vendor/policy out/soong/.intermediates/system/sepolicy/sepolicy_neverallows_vendor.checkpolicy.conf/android_common/sepolicy_neverallows_vendor.
checkpolicy.conf # hash of input list: 15871fa7f1904c26cfc726ea362c19ede7f225bff09f1871b1f7d5657882753a
device/generic/car/emulator/usbpt/bluetooth/btusb/sepolicy/domain.te:2:ERROR 'unknown type qemu_device' at token ';' on line 78981:
allow domain qemu_device:chr_file { { getattr open read ioctl lock map watch watch_reads } { open append write lock map } };
#line 1 "device/generic/car/emulator/usbpt/bluetooth/btusb/sepolicy/domain.te"
checkpolicy:  error(s) encountered while parsing configuration
09:14:22 ninja failed with: exit status 1

#### failed to build some targets (03:20 (mm:ss)) ####

编译错误解决步骤 #

错误根源是SEPolicy规则中引用了未定义的qemu_device类型，可通过以下两种方式修复：

方法1：替换为已存在的设备类型 #

1. 打开文件 device/generic/car/emulator/usbpt/bluetooth/btusb/sepolicy/domain.te
2. 将第2行的qemu_device替换为goldfish_device（X86_64模拟器环境下的标准设备类型），修改后规则如下：

   allow domain goldfish_device:chr_file { { getattr open read ioctl lock map watch watch_reads } { open append write lock map } };
   

3. 重新执行编译命令：make -j$(nproc)

方法2：定义缺失的设备类型 #

1. 在同一sepolicy目录下创建qemu_device.te文件，添加类型定义：

   type qemu_device, dev_type;
   

2. 修改该目录下的file_contexts文件，添加设备节点的上下文映射（按需添加）：

   /dev/qemu.*    u:object_r:qemu_device:s0
   

3. 重新执行编译命令

AOSP分支选择建议 #

• 稳定优先：优先选择android-XX.0.0_rXX格式的发布分支，这类分支经过官方测试，稳定性高，适合生产或常规开发。
• 特性需求：若需要特定新特性，可选择android-XX.1.0_rXX的维护更新分支，或master分支（注意master为开发分支，稳定性差，可能存在未修复bug）。
• 维护周期：每个Android版本分支有固定维护周期，选择时需确认目标分支是否仍在官方维护范围内，避免后续无法获取安全补丁。

版本发布说明查询方法 #

• 源码内置文件：查看分支下的build/make/core/build_id.mk和build/make/core/version_defaults.mk，可获取版本号、BUILD_ID等核心信息。
• 变更记录：通过git命令查看分支提交历史，了解版本更新内容：

  repo forall -c git log --oneline -n 20
  

• 框架配置：查看frameworks/base/core/res/res/values/config.xml文件，可了解系统特性的配置变更。

内容的提问来源于stack exchange，提问作者HucKQC