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README
Apache-2.0

init组件

简介

init组件负责处理从内核加载第一个用户态进程开始,到第一个应用程序启动之间的系统服务进程启动过程。启动恢复子系统除负责加载各系统关键进程之外,还需在启动的同时设置其对应权限,并在子进程启动后对指定进程实行保活(若进程意外退出要重新启动),对于特殊进程意外退出时,启动恢复子系统还要执行系统复位操作。

目录

base/startup/init_lite/             # init组件
├── LICENSE
└── services
    ├── include                  # init组件头文件目录
    ├── src                      # init组件源文件目录
    └── test                     # init组件测试用例源文件目录
        └── unittest
vendor
└──huawei
        └──camera
                └──init_configs  # init配置文件目录(json格式,镜像烧写后部署于/etc/init.cfg)

约束

目前支持小型系统设备(参考内存≥1MB),如Hi3516DV300、Hi3518EV300。

使用说明

init将系统启动分为三个阶段:

“pre-init”阶段:启动系统服务之前需要先执行的操作,例如挂载文件系统、创建文件夹、修改权限等

“init”阶段:系统服务启动阶段

“post-init”阶段:系统服务启动完后还需要执行的操作

上述每个阶段在配置文件init.cfg中都用一个job表示,每个job都对应一个命令集合,init通过依次执行每个job中的命令来完成系统初始化。job执行顺序:先执行“pre-init”,再执行“init”,最后执行“post-init”,所有job都集中放在init.cfg的jobs数组中。

除上述jobs数组之外,init.cfg中还有一个services数组,用于存放所有需要由init进程启动的系统关键服务的服务名、可执行文件路径、权限和其他属性信息。

配置文件init.cfg位于代码仓库/vendor/hisilicon/hispark_aries/init_configs/目录,部署在/etc/下,采用json格式,文件大小目前限制在100KB以内。

配置文件格式和内容说明如下所示:

{
    "jobs" : [{
            "name" : "pre-init",
            "cmds" : [
                "mkdir /testdir",
                "chmod 0700 /testdir",
                "chown 99 99 /testdir",
                "mkdir /testdir2",
                "mount vfat /dev/mmcblk0p0 /testdir2 noexec nosuid"
            ]
        }, {
            "name" : "init",
            "cmds" : [
                "start service1",
                "start service2"
             ]
        }, {
             "name" : "post-init",
             "cmds" : []
        }
    ],
    "services" : [{
            "name" : "service1",
            "path" : "/bin/process1",
            "uid" : 1,
            "gid" : 1,
            "once" : 0,
            "importance" : 1,
            "caps" : [0, 1, 2, 5]
    }, {
            "name" : "service2",
            "path" : "/bin/process2",
            "uid" : 2,
            "gid" : 2,
            "once" : 1,
            "importance" : 0,
            "caps" : []
        }
    ]
}

表 1 执行job介绍

job名

说明

pre-init

最先执行的job,如果开发者的进程在启动之前需要首先执行一些操作(例如创建文件夹),可以把操作放到pre-init中先执行。

init

中间执行的job,例如服务启动。

post-init

最后被执行的job,如果开发者的进程在启动完成之后需要有一些处理(如驱动初始化后再挂载设备),可以把这类操作放到该job执行。

单个job最多支持30条命令(当前仅支持start/mkdir/chmod/chown/mount/loadcfg),命令名称和后面的参数(参数长度≤128字节)之间有且只能有一个空格。

表 2 命令集说明

命令

命令格式和示例

说明

mkdir

mkdir 目标文件夹

如:mkdir /storage/myDirectory

创建文件夹命令,mkdir和目标文件夹之间有且只能有一个空格。

chmod

chmod 权限 目标

如:chmod 0600 /storage/myFile.txt

chmod 0750 /storage/myDir

修改权限命令,chmod 权限 目标 之间间隔有且仅有一个空格,权限必须为0xxx格式。

chown

chown uid gid 目标

如:chown 900 800 /storage/myDir

chown 100 100 /storage/myFile.txt

修改属组命令,chown uid gid 目标 之间间隔有且仅有一个空格。

mount

mount fileSystemType src dst flags data

如:mount vfat /dev/mmcblk0 /sdc rw,umask=000

mount jffs2 /dev/mtdblock3 /storage nosuid

挂载命令,各参数之间有且仅有一个空格。flags当前仅支持nodev、noexec、nosuid、rdonly,data为可选字段。

start

start serviceName

如:start foundation

start shell

启动服务命令,start后面跟着service名称,该service名称必须能够在services数组中找到。

loadcfg

loadcfg filePath

如:loadcfg /patch/fstab.cfg

加载其他cfg文件命令。后面跟着的目标文件大小不得超过50KB,且目前仅支持加载/patch/fstab.cfg,其他文件路径和文件名均不支持。/patch/fstab.cfg文件的每一行都是一条命令,命令类型和格式必须符合本表格描述,命令条数不得超过20条。

表 3 service字段说明

字段名

说明

name

当前服务的名称,须确保非空且长度≤32字节。

path

当前服务的可执行文件全路径和参数,数组形式。须确保第一个数组元素为可执行文件路径、数组元素个数≤20、每个元素为字符串形式以及每个字符串长度≤64字节。

uid

当前服务进程的uid值。

gid

当前服务进程的gid值。

once

当前服务进程是否为一次性进程:

1:一次性进程,当该进程退出时,init不会重新启动该服务进程

0 : 常驻进程,当该进程退出时,init收到SIGCHLD信号并重新启动该服务进程;

注意:对于常驻进程,若在4分钟之内连续退出5次,第5次退出时init将不会再重新拉起该服务进程。

importance

当前服务进程是否为关键系统进程:

0:非关键系统进程,当该进程退出时,init不会将系统复位重启;

1:关键系统进程,当该进程退出时,init将系统复位重启。

caps

当前服务所需的capability值,根据安全子系统已支持的capability,评估所需的capability,遵循最小权限原则配置(当前最多可配置100个值)。

相关仓

启动恢复子系统

startup_syspara_lite

startup_appspawn_lite

startup_bootstrap_lite

startup_init_lite

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init process for startup | 启动模块init进程 展开 收起
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