我有运行shell脚本的用户服务,它尝试访问我的会话的锁屏状态,如下所示:
# Test Unity screen-lock:
isLocked() {
isLocked=$(gdbus call -e -d com.canonical.Unity -o /com/canonical/Unity/Session -m com.canonical.Unity.Session.IsLocked)
}
lock() {
if [[ $isLocked == "(false,)" ]]; then
gnome-screensaver-command -l
elif [[ $isLocked == "(true,)" ]]; then
exit 1
fi
exit 0
}
问题是服务“是按用户进程,而不是按会话”,我不知道如何访问会话dbus:
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name com.canonical.Unity was not provided by any .service files
答案 0 :(得分:1)
我遇到了同样的问题,我的研究结果都没有。如果有人能找到更好的方式来查询Unity的锁定状态,我很乐意听到它。
我最近了解了命名管道,当时我想知道我可能会使用这样的东西。事实证明,这个问题恰好是一个完美的应用程序。
创建以下脚本......
#!/bin/bash
# this script is meant to be called in two different ways.
# 1. It can be called as a service by passing "service" as the first argument. In this
# mode, the script listens for requests for lock screen status. The script should be
# run in this mode with startup applications on user logon.
# 2. If this script is called without any arguments, it will call the service to request
# the current lock screen status. Call this script in this manner from your user
# service.
# this will be the named pipe we'll use for requesting and receiving screen lock status
pipe="/tmp/lockscreen-status"
if [ "$1" == "service" ]; then
# setup the named pipe
rm "$pipe"
mkfifo "$pipe"
# start watching for requests
while true
do
# watch the pipe for trigger events requesting lock screen status
read request < "$pipe"
# respond across the same pipe wit the current lock screen status
gdbus call -e -d com.canonical.Unity -o /com/canonical/Unity/Session -m com.canonical.Unity.Session.IsLocked | grep -oP "(true)|(false)" > "$pipe"
done
else
# make sure the pipe exists
if [ ! -e "$pipe" ]; then
echo "This script must started in service mode before lock status can be queried."
exit
fi
# send a request for screen lock status and read the response
touch "$pipe"
read status < "$pipe"
[ "$status" == "" ] && status="This script must started in service mode before lock status can be queried."
# print reponse to screen for use by calling application
echo $status
fi
如评论中所述,您需要以两种方式调用此脚本。用户登录时,请在服务模式下启动此脚本。我使用&#34;启动应用程序&#34;程序调用脚本,但只要在登录时由您的用户帐户调用它,它的调用方式并不重要。 然后从您的用户服务中,只需调用此脚本,它将返回&#34; true&#34;如果屏幕被锁定或“错误”#34;如果屏幕未锁定。