通过命令的标准输出以编程方式导出环境变量[重复]

Question

WinEunuuchs2Unix

Asked: 2020-02-08 16:00:01 +0800 CST2020-02-08 16:00:01 +0800 CST 2020-02-08 16:00:01 +0800 CST

systemd 通过在脚本名称前添加 0000:00:14.0 来破坏 $0

772

我有一个脚本/lib/systemd/system-sleep可以从命令行完美运行：

$ ll /lib/systemd/system-sleep/smartplug

-rwxr-xr-x 1 root root 713 Feb  7 04:55 /lib/systemd/system-sleep/smartplug*

$ sudo /lib/systemd/system-sleep/smartplug pre Suspend

/lib/systemd/system-sleep/smartplug: Going to Suspend...
/lib/systemd/system-sleep/smartplug: Status of: 192.168.0.15 is: OFF

$ sudo /lib/systemd/system-sleep/smartplug post Suspend

/lib/systemd/system-sleep/smartplug: Waking up from Suspend...

但是，当systemd在挂起期间调用脚本时，它会“污染”脚本的名称并从被调用的脚本返回 null：

$ journalctl -b-0 | grep smartplug

Feb 07 05:47:30 alien systemd-sleep[32243]: /lib/systemd/system-sleep/smartplug: Going to suspend...
Feb 07 05:47:30 alien systemd-sleep[32243]: 0000:00:14.0/lib/systemd/system-sleep/smartplug: Status of: 192.168.0.15 is:
Feb 07 16:36:10 alien systemd-sleep[32243]: /lib/systemd/system-sleep/smartplug: Waking up from suspend...

systemd应该说：

Feb 07 05:47:30 alien systemd-sleep[32243]: /lib/systemd/system-sleep/smartplug: Status of: 192.168.0.15 is: OFF

但它在说：

Feb 07 05:47:30 alien systemd-sleep[32243]: 0000:00:14.0/lib/systemd/system-sleep/smartplug: Status of: 192.168.0.15 is:

我以前从未见过这种奇怪的行为。以下是脚本内容：

#!/bin/bash

# NAME: smartplug
# PATH: /lib/systemd/system-sleep
# CALL: Called from SystemD automatically
# DESC: When suspending turn off Kasa smartplugs.
# NOTE: Copy hs100.sh and myip.sh from user directory to /usr/bin.

# DATE: Feb 6 2020.

TMPLIST=/tmp/smartplug-list
PlugArr=( "192.168.0.15" )

case $1/$2 in
  pre/*)
    echo "$0: Going to $2..."
    echo -n '' > "$TMPLIST"

    status=$(hs100.sh -i "${PlugArr[0]}" check | cut -f2)
    echo "$0: Status of: ${PlugArr[0]} is: $status"
    if [[ "$status" == ON ]] ; then
        hs100.sh -i "${PlugArr[0]}" off
        echo "${PlugArr[0]}" >> "$TMPLIST"
    fi
        ;;
  post/*)
    echo "$0: Waking up from $2..."
    rm $TMPLIST
        ;;
esac

回复评论

由于。。。导致的结果`lspci -vt`

$ lspci -vt
-[0000:00]-+-00.0  Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers
           +-01.0-[01]--+-00.0  NVIDIA Corporation GM204M [GeForce GTX 970M]
           |            \-00.1  NVIDIA Corporation GM204 High Definition Audio Controller
           +-02.0  Intel Corporation HD Graphics 530
           +-04.0  Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem
           +-14.0  Intel Corporation 100 Series/C230 Series Chipset Family USB 3.0 xHCI Controller

由于。。。导致的结果`journalctl -b-0 | grep smartplug -A5`

这确认断开 PCI 总线是问题消息的根源

--
Feb 07 22:40:15 alien systemd-sleep[14761]: /lib/systemd/system-sleep/smartplug: Going to suspend...
Feb 07 22:40:15 alien systemd-sleep[14761]: /lib/systemd/system-sleep/custom-xhci_hcd: Going to suspend...
Feb 07 22:40:15 alien systemd-sleep[14761]: Failed to connect to non-global ctrl_ifname: (nil)  error: No such file or directory
Feb 07 22:40:15 alien systemd-sleep[14762]: /lib/systemd/system-sleep/wpasupplicant failed with error code 255.
Feb 07 22:40:15 alien systemd-sleep[14762]: /lib/systemd/system-sleep/r8169-reset failed with error code 1.
Feb 07 22:40:15 alien kernel: xhci_hcd 0000:00:14.0: remove, state 4
--
Feb 07 22:40:15 alien systemd-sleep[14761]: 0000:00:14.0/lib/systemd/system-sleep/smartplug: Status of: 192.168.0.15 is:
Feb 07 22:40:15 alien kernel: usb 1-9: USB disconnect, device number 9
Feb 07 22:40:15 alien acpid[1320]: input device has been disconnected, fd 22
Feb 07 22:40:15 alien kernel: xhci_hcd 0000:00:14.0: USB bus 1 deregistered
Feb 07 22:40:15 alien kernel: xhci_hcd 0000:39:00.0: remove, state 4
Feb 07 22:40:15 alien kernel: usb usb4: USB disconnect, device number 1
--

请注意，他们的行xhci_hcd 0000:00:14.0: USB bus 1 deregistered是一个脚本custom-xhci_hcd，其工作是断开所有 USB 设备（解除绑定/关闭电源）。它导致smartplug脚本失败，因为它需要 WiFi 才能关闭 Kasa Smartplug。

我还没有走出困境，因为当笔记本电脑挂起时，Smartplug 仍然没有关闭电视灯。我认为这是由于网络管理器过快地关闭 WiFi，但需要进行更多调查。

禁用后custom-xhci_hcd（几年前写的，但内核可能不再需要4.14.170这是journalctl：

--
Feb 08 09:14:44 alien systemd-sleep[3032]: /lib/systemd/system-sleep/smartplug: Going to suspend...
Feb 08 09:14:44 alien systemd-sleep[3032]: Failed to connect to non-global ctrl_ifname: (nil)  error: No such file or directory
Feb 08 09:14:44 alien systemd-sleep[3033]: /lib/systemd/system-sleep/wpasupplicant failed with error code 255.
Feb 08 09:14:44 alien eyesome[3127]: Wakeup: Creating /tmp/eyesome-is-suspending
Feb 08 09:14:44 alien systemd-sleep[3032]: /lib/systemd/system-sleep/smartplug: Status of: 192.168.0.15 is:
Feb 08 09:14:44 alien systemd-sleep[3033]: /lib/systemd/system-sleep/display-auto-brightness failed with error code 1.
Feb 08 09:14:45 alien systemd-sleep[3033]: /lib/systemd/system-sleep/lag-suspend.sh failed with error code 1.
Feb 08 09:14:45 alien systemd-sleep[3033]: /lib/systemd/system-sleep/r8169-reset failed with error code 1.
Feb 08 09:14:45 alien systemd-sleep[3033]: /lib/systemd/system-sleep/iwlwifi-reset failed with error code 1.
Feb 08 09:14:45 alien systemd-sleep[3032]: Suspending system...
--
Feb 08 09:14:57 alien systemd-sleep[3032]: /lib/systemd/system-sleep/smartplug: Waking up from suspend...
Feb 08 09:14:57 alien systemd-sleep[3032]: Failed to connect to non-global ctrl_ifname: (nil)  error: No such file or directory
Feb 08 09:14:57 alien kernel: PM: suspend exit
Feb 08 09:14:57 alien eyesome[3346]: Wakeup: Called from suspend.
Feb 08 09:14:57 alien systemd-sleep[3032]: /dev/sda:
Feb 08 09:14:57 alien systemd-sleep[3032]:  setting Advanced Power Management level to 0xfe (254)

脚本中的其他错误代码/lib/systemd/system-sleep是因为脚本不可执行，但由于历史原因而保留。

rick@alien:/lib/systemd/system-sleep$ ll
total 68
drwxr-xr-x 2 root root 4096 Feb  7 04:55 ./
drwxr-xr-x 8 root root 4096 Feb  6 16:53 ../
-rw-r--r-- 1 root root 1079 Oct 28  2018 custom-xhci_hcd
-rw-r--r-- 1 root root 1079 Oct 28  2018 custom-xhci_hcd~
-rw-r--r-- 1 root root 1539 Jun 10  2018 display-auto-brightness
-rwxr-xr-x 1 root root   92 Mar 17  2016 hdparm*
-rw-r--r-- 1 root root  716 Apr 22  2017 iwlwifi-reset
-rw-r--r-- 1 root root  572 Oct 28  2018 lag-suspend.sh
-rw-r--r-- 1 root root  522 Oct 21  2018 lag-suspend.sh~
-rw-r--r-- 1 root root 2820 Aug  5  2018 r8169-reset
-rwxr-xr-x 1 root root  713 Feb  7 04:55 smartplug*
-rwxr-xr-x 1 root root  661 Feb  7 04:53 smartplug~*
-rwxr-xr-x 1 root root 1114 Oct 28  2018 sound*
-rwxr-xr-x 1 root root 1171 Aug  5  2018 sound~*
-rwxr-xr-x 1 root root  317 Aug 29 05:44 systemd-wake-eyesome*
-rwxr-xr-x 1 root root  219 Apr 29  2019 unattended-upgrades*
-rwxr-xr-x 1 root root  182 Oct 26  2015 wpasupplicant*

由于。。。导致的结果`cat -v`

根据评论请求：

$ sudo /lib/systemd/system-sleep/smartplug pre Suspend |& cat -v
/lib/systemd/system-sleep/smartplug: Going to Suspend...
/lib/systemd/system-sleep/smartplug: Status of: 192.168.0.15 is: ON

注意管道|& cat -v不会改变输出。

1 个回答

Voted

WinEunuuchs2Unix · Answer 1 · 2020-03-08T12:03:28+08:00

Systemd 首先关闭网络管理器

即使通过在挂起期间不断开 USB 总线来更正错误消息后，问题仍然存在，您无法在挂起期间发送 WiFi 命令。

网络管理器是在挂起/休眠和关机期间关闭的第一个服务。如果您想在这些时间向设备发送 WiFi 无线电信号，您需要阅读此内容。

将您的脚本移出 Systemd “hacks”

为了解决我的问题，我创建了脚本：

/etc/NetworkManager/dispatcher.d/pre-down.d/smartplug_off

该脚本必须标记为可执行（chmod a+x scriptname），对我来说它包含：

#!/bin/bash

# NAME: smartplug_off
# PATH: /etc/NetworkManager/dispatcher.d/pre-down.d
# DESC: Turn off smartplug light power for TV light
# DATE: March 7, 2020.

# CALL: Called by Network Manager before going down. Network manager in turn
#       is called by systemd during suspend/hibernate/shutdown

# NOTE: myisp.sh and hs100.sh must be installed for hs100 tp-link power plug.
#       https://developer.gnome.org/NetworkManager/stable/NetworkManager.html

PlugName="192.168.0.15"

status=$(hs100.sh -i "$PlugName" check | cut -f2)
if [ $status == "OFF" ] ; then
    : # Nothing to do already off
elif [ $status == "ON" ] ; then
    hs100.sh -i "$PlugName" off
else
    echo Error hs100.sh not responding check connection and IP "$PlugName".
fi

systemd 通过在脚本名称前添加 0000:00:14.0 来破坏 $0

回复评论

由于。。。导致的结果`lspci -vt`

由于。。。导致的结果`journalctl -b-0 | grep smartplug -A5`

由于。。。导致的结果`cat -v`

Systemd 首先关闭网络管理器

将您的脚本移出 Systemd “hacks”

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systemd 通过在脚本名称前添加 0000:00:14.0 来破坏 $0

回复评论

由于。。。导致的结果lspci -vt

由于。。。导致的结果journalctl -b-0 | grep smartplug -A5

由于。。。导致的结果cat -v

1 个回答

Systemd 首先关闭网络管理器

将您的脚本移出 Systemd “hacks”

相关问题

由于。。。导致的结果`lspci -vt`

由于。。。导致的结果`journalctl -b-0 | grep smartplug -A5`

由于。。。导致的结果`cat -v`