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我正在尝试使用 SWUpdate 和 Hawkbit 设置嵌入式 linux 更新系统。我使用 Yocto 作为构建系统。我能够创建一个安装了 SWUpdate 二进制文件的图像，如 SWUpdate 文档中给出的那样。现在，我想在启动时启动 SWUpdate 守护程序，为此我正在使用 Systemd 服务。SWUpdate systemd 集成

但是我在启动时遇到了启动 swupdate 守护进程的问题。

swupdate.service：

[Unit]
Description=SWUpdate daemon
Documentation=https://github.com/sbabic/swupdate
Documentation=https://sbabic.github.io/swupdate

[Service]
ExecStart=@LIBDIR@/swupdate/swupdate.sh
KillMode=mixed

[Install]
WantedBy=multi-user.target

当我systemctl status swupdate.service用 bitbaked 图像启动我的电路板后，我得到：

* swupdate.service - SWUpdate daemon
     Loaded: loaded (/lib/systemd/system/swupdate.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Thu 2022-02-10 12:41:49 UTC; 12min ago
TriggeredBy: * swupdate.socket
       Docs: https://github.com/sbabic/swupdate
             https://sbabic.github.io/swupdate
    Process: 311 ExecStart=/usr/lib/swupdate/swupdate.sh (code=exited, status=1/FAILURE)
   Main PID: 311 (code=exited, status=1/FAILURE)

Feb 10 12:41:49 dh-stm32mp1-dhcor-avenger96 systemd[1]: Started SWUpdate daemon.
Feb 10 12:41:49 dh-stm32mp1-dhcor-avenger96 swupdate.sh[311]: /usr/lib/swupdate/conf.d/09-swupdate-args: line 10: [: ==: unary operator expected
Feb 10 12:41:49 dh-stm32mp1-dhcor-avenger96 swupdate.sh[311]: /usr/bin/swupdate: invalid option -- 'u'
Feb 10 12:41:49 dh-stm32mp1-dhcor-avenger96 swupdate.sh[311]: /usr/bin/swupdate: invalid option -- 'u'
Feb 10 12:41:49 dh-stm32mp1-dhcor-avenger96 swupdate.sh[311]: Try /usr/bin/swupdate -h for usage
Feb 10 12:41:49 dh-stm32mp1-dhcor-avenger96 systemd[1]: swupdate.service: Main process exited, code=exited, status=1/FAILURE
Feb 10 12:41:49 dh-stm32mp1-dhcor-avenger96 systemd[1]: swupdate.service: Failed with result 'exit-code'.
Feb 10 12:41:49 dh-stm32mp1-dhcor-avenger96 systemd[1]: swupdate.service: Start request repeated too quickly.
Feb 10 12:41:49 dh-stm32mp1-dhcor-avenger96 systemd[1]: swupdate.service: Failed with result 'exit-code'.
Feb 10 12:41:49 dh-stm32mp1-dhcor-avenger96 systemd[1]: Failed to start SWUpdate daemon.

结果ps ax | grep swupdate：

  234 ?               Ss     0:03  /usr/bin/swupdate-progress -r -w
  392 ttySTM0  S+     0:00 grep swupdate

swupdate.sh 和 swupdate.service 文件中没有任何更改。元软件更新

swupdate.sh：

#!/bin/sh

# Override these variables in sourced script(s) located
# in /usr/lib/swupdate/conf.d or /etc/swupdate/conf.d
SWUPDATE_ARGS="-v ${SWUPDATE_EXTRA_ARGS}"
SWUPDATE_WEBSERVER_ARGS=""
SWUPDATE_SURICATTA_ARGS=""

# source all files from /etc/swupdate/conf.d and /usr/lib/swupdate/conf.d/
# A file found in /etc replaces the same file in /usr
for f in `(test -d /usr/lib/swupdate/conf.d/ && ls -1 /usr/lib/swupdate/conf.d/; test -d /etc/swupdate/conf.d && ls -1 /etc/swupdate/conf.d) | sort -u`; do
  if [ -f /etc/swupdate/conf.d/$f ]; then
    . /etc/swupdate/conf.d/$f
  else
    . /usr/lib/swupdate/conf.d/$f
  fi
done

#  handle variable escaping in a simmple way. Use exec to forward open filedescriptors from systemd open.
if [ "$SWUPDATE_WEBSERVER_ARGS" != "" -a  "$SWUPDATE_SURICATTA_ARGS" != "" ]; then
  exec /usr/bin/swupdate $SWUPDATE_ARGS -w "$SWUPDATE_WEBSERVER_ARGS" -u "$SWUPDATE_SURICATTA_ARGS"
elif [ "$SWUPDATE_WEBSERVER_ARGS" != "" ]; then
  exec /usr/bin/swupdate $SWUPDATE_ARGS -w "$SWUPDATE_WEBSERVER_ARGS"
elif [ "$SWUPDATE_SURICATTA_ARGS" != "" ]; then
  exec /usr/bin/swupdate $SWUPDATE_ARGS -u "$SWUPDATE_SURICATTA_ARGS"
else
  exec /usr/bin/swupdate $SWUPDATE_ARGS
fi

09-swupdate-args：此脚本确保使用正确的参数调用 Suricatta，并$使用正确的值更新占位符。它位于/usr/lib/swupdate/conf.d

09-swupdate-args：

rootfs=`mount | grep "on / type" | cut -d':' -f 2 | cut -d' ' -f 1`

if [ $rootfs == '/dev/mmcblk0p4' ];then
        selection="-e stable,copy2"
else
        selection="-e stable,copy1"
fi

state=`fw_printenv ustate | cut -f 2 -d'='`
if [ $state == 1 ];then
        SWUPDATE_SURICATTA_ARGS="-c 2"
else
        SWUPDATE_SURICATTA_ARGS=" "
fi

SWUPDATE_ARGS="-H dh-stm32mp1-dhcor-avenger96:1.0 ${selection} -f /etc/swupdate.cfg"

也fw_printenv ustate | cut -f 2 -d'='导致空。这是什么意思？

如果有人遇到过 SWUpdate 的这个问题，你能告诉我这里缺少什么吗？以及如何解决这个问题？

您的帮助将不胜感激。

提前致谢

PS：我正在使用 SWUpdate v2021.04.0 来更新我基于 STM32MP1 的 Avenger96 板。如果这里缺少任何信息，请告诉我。

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