[yocto]使用devtool工具创建配方文件

1. devtool创建新的工作环境

在使用devtool之前需要先搭建poky环境，并且需要引用poky的构建环境；见之前的文章
基于poky项目创建自己的层并且在层中增加自己的配方文件

创建工作环境

使用devtool创建workspace需要指定路径，否则默认在当前目录下创建新层

devtool create-workspace meta-devtool

~/test/poky$ bitbake-layers show-layers
NOTE: Starting bitbake server...
layer                 path                                                                    priority
========================================================================================================
core                 /xxx/test/poky/meta                                   5
yocto                /xxx/test/poky/meta-poky                              5
yoctobsp             /xxx/test/poky/meta-yocto-bsp                         5
meta-test            /xxx/test/poky/meta-test                              6
workspacelayer       /xxx/test/poky/meta-devtool                           99

新增的层名字为workspacelayer，路径为/xxx/test/poky/meta-devtool

2. 生成配方文件

a.源保存在网络外部镜像中

devtool add recipe fetchuri

本例源来自网络外部；源被下载到工作目录下的sources目录，生成一个bbappend配方文件继承externalsrc类来指向源；

command

devtool add hello https://ftp.gnu.org/gnu/hello/hello-2.12.tar.gz

~/test/poky/meta-devtool$ tree -L 1
.
├── appends
├── conf
├── README
├── recipes
└── sources

hello_2.12.1-6fe9.bbappend

inherit externalsrc
EXTERNALSRC = "/xxx/test/poky/meta-devtool/sources/hello"

# initial_rev: 645b54bc75f055185b26d766a7d713871eec4152

b.源保存在本地，但不保存当前工作区中

devtool add recipe srctree

本例源来自于本地的meta-test/recipes-test/hello/hello-1.0，所以生成的配方文件SRC_URI为空，且在append文件中追加了源的本地路径

command

devtool add hello meta-test/recipes-test/hello/hello-1.0/

.
├── appends
│   └── hello.bbappend
├── conf
│   └── layer.conf
├── README
└── recipes
    └── hello
        └── hello.bb

4 directories, 4 files

hello.bb

# Recipe created by recipetool
# This is the basis of a recipe and may need further editing in order to be fully functional.
# (Feel free to remove these comments when editing.)

# Unable to find any files that looked like license statements. Check the accompanying
# documentation and source headers and set LICENSE and LIC_FILES_CHKSUM accordingly.
#
# NOTE: LICENSE is being set to "CLOSED" to allow you to at least start building - if
# this is not accurate with respect to the licensing of the software being built (it
# will not be in most cases) you must specify the correct value before using this
# recipe for anything other than initial testing/development!
LICENSE = "CLOSED"
LIC_FILES_CHKSUM = ""

# No information for SRC_URI yet (only an external source tree was specified)
SRC_URI = ""

# NOTE: no Makefile found, unable to determine what needs to be done

do_configure () {
	# Specify any needed configure commands here
	:
}

do_compile () {
	# Specify compilation commands here
	:
}

do_install () {
	# Specify install commands here
	:
}

hello.bbappend

inherit externalsrc
EXTERNALSRC = "/xxx/test/poky/meta-test/recipes-test/hello/hello-1.0"
EXTERNALSRC_BUILD = "/xxx/test/poky/meta-test/recipes-test/hello/hello-1.0"

c. 源保存在网络外部镜像中，但fetch获取保存在工作区外

devtool add recipe srctree fetchuri

本例中源被网络下载并且保存到 ../meta-test/recipes-test/mysource

command

devtool add hello ../meta-test/recipes-test/mysource https://ftp.gnu.org/gnu/hello/hello-2.12.tar.gz

.
├── appends
│   └── hello_2.12.1-6fe9.bbappend
├── conf
│   └── layer.conf
├── README
└── recipes
    └── hello
        └── hello_2.12.1-6fe9.bb

hello.bbappend

inherit externalsrc
EXTERNALSRC = "/home/wjzhang/poky/test/111/poky/meta-test/recipes-test/mysource"

# initial_rev: 7b0ae8a9f30fd8f0c2b1f5e9de66317cd78964e5

3 编辑修改配方文件

devtool edit-recipe recipe

以修改hello的配方文件为例
```
devtool edit-recipe hello
```

4 编译目标

devtool build recipe

构建包含所有来自workspace层的菜谱的镜像

devtool build-image <image-name>

5 部署包到目标系统

可以将构建完成的包部署到目标系统上，目标系统可以是实际硬件或者QEMU；唯一要求是目标系统必须是运行着SSH的服务器

devtool deploy-target recipe target

从目标系统移除包

devtool undeploy-target recipe target

6 完成配方上的工作

devtool finish recipe layer

命令创建和本地git仓库中的提交相对应的补丁，将新配方移到更永久的层，然后重置配方，使配方正常构建而不是从工作区构建