yocto

嗨，这是我的图层树

├── conf
│   └── layer.conf
├── COPYING.MIT
├── README
└── recipes-hello
    ├── helloworld
    │   ├── helloworld-0.1
    │   │   ├── helloworld.c
    │   │   ├── helloworld.patch
    │   │   └── newhelloworld.c
    │   └── helloworld_0.1.bb
    ├── message
    │   ├── message-0.1
    │   │   └── message.txt
    │   └── message_0.1.bb
    └── service
        ├── service-0.1
        │   ├── test_systemd.service
        │   └── test_systemd.sh
        └── service_0.1.bb

这里test_systemd.service是必须调用test_systemd.sh的服务文件，我正在尝试使用service_0.1.bb来实现

    # This recipe performs the following tasks
    # 1) Install .sh file in /home/root/ and .sh script creates a random text file
    # 2) Install the .service file in systemd directory
    # 3) Invoke the .sh script via .service file
    inherit systemd

SUMMARY = "Install and start a systemd service"
SECTION = "examples"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"

#here we specify the source we want to build
SRC_URI = "file://test_systemd.sh"
SRC_URI += "file://test_systemd.service"
#here we specify the source directory, where we can do all the building and expect sources to be placed
S = "${WORKDIR}"

SYSTEMD_SERVICE_${PN} = "test_systemd.service"


#bitbake task
#created a directory /home/root for target install the script
do_install() {
             install -d ${D}/home/root
             install -m 0755 ${WORKDIR}/test_systemd.sh ${D}/home/root

             install -d ${D}{systemd_system_unitdir}
             install -m 0644 ${WORKDIR}/test_systemd.service ${D}{systemd_system_unitdir}
}

#Pack the path
FILES_${PN} += "/home/root"
FILES_${PN} += "/lib/systemd/system"

REQUIRED_DISTRO_FEATURES= "systemd"

问题是当我尝试对系统配方进行bitbake时，bitbake抛出错误，提示未找到test_systemd.service。
我设法通过先前的尝试将两个文件都安装在RFS中，但是当我包含systemd概念时。我收到没有此类文件错误。可能是什么原因？
错误信息

 NOTE: Executing SetScene Tasks
NOTE: Executing RunQueue Tasks
ERROR: service-0.1-r0 do_package: SYSTEMD_SERVICE_service value test_systemd.service does not exist
ERROR: service-0.1-r0 do_package: Function failed: systemd_populate_packages
ERROR: Logfile of failure stored in: /home/guest/yocto_practice/poky/build-beaglebone/tmp/work/cortexa8hf-neon-poky-linux-gnueabi/service/0.1-r0/temp/log.do_package.2860
ERROR: Task (/home/guest/yocto_practice/meta-testlayer/recipes-hello/service/service_0.1.bb:do_package) failed with exit code '1'
NOTE: Tasks Summary: Attempted 514 tasks of which 506 didn't need to be rerun and 1 failed.

Summary: 1 task failed:
  /home/guest/yocto_practice/meta-testlayer/recipes-hello/service/service_0.1.bb:do_package
Summary: There were 2 ERROR messages shown, returning a non-zero exit code.

这也是为systemd编写bb配方的正确方法吗，编写此脚本的意义是什么？

#Pack the path
    FILES_${PN} += "/home/root"
    FILES_${PN} += "/lib/systemd/system"

没有此位烘烤将引发错误。

最佳答案

SYSTEMD_SERVICE_${PN} += "file://test_systemd.service"

应该是：

SYSTEMD_SERVICE_${PN} = "test_systemd.service"

其他说明（与错误无关）：

将内容安装到/ home可能不是一个好主意（您可以将${libexecdir}用于其他脚本所需的脚本）。
没有理由在bb文件中包含do_install_append()：您可以将所有内容都放入do_install()
如果您的Yocto是最新的，则使用${systemd_system_unitdir}代替/lib/systemd/system是个好主意（在较早的版本中，${systemd_unitdir}/system/有效）

关于yocto - 使用yocto启用系统服务，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45614578/

yocto - 使用yocto启用系统服务