[问题描述]： 以下几个包的help命令报错相同 qt5-assistant.aarch64 qt5-designer.aarch64 qt5-doctools.aarch64 qt5-linguist.aarch64 qt5-qdbusviewer.aarch64 qt5-qtdeclarative-devel.aarch64 qt5-qttools-devel.aarch64 qv4l2.aarch64 [root@iZbp10tndzn2fahsrwa0gnZ ~]# /usr/bin/assistant-qt5 --help qt.qpa.xcb: could not connect to display qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found. This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem. Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb. Aborted (core dumped) [环境信息]： 内核信息： # uname -r 5.10.134-12.1.an23.aarch64 操作系统信息： # cat /etc/os-release [root@VM20210305-13 tone]# cat /etc/os-release NAME="Anolis OS" VERSION="23" ID="anolis" VERSION_ID="23" PLATFORM_ID="platform:an23" PRETTY_NAME="Anolis OS 23" ANSI_COLOR="0;31" HOME_URL="https://openanolis.cn/" BUG_REPORT_URL="https://bugzilla.openanolis.cn/" 软件包信息： [root@iZbp10tndzn2fahsrwa0gnZ ~]# yum info qt5-assistant.aarch64 Failed to set locale, defaulting to C.UTF-8 Last metadata expiration check: 1:23:27 ago on Mon Oct 24 15:20:44 2022. Installed Packages Name : qt5-assistant Version : 5.15.5 Release : 1.an23 Architecture : aarch64 Size : 918 k Source : qt5-qttools-5.15.5-1.an23.src.rpm Repository : @System From repo : AppStream Summary : Documentation browser for Qt5 URL : http://www.qt.io License : LGPLv3 or LGPLv2 Description : Documentation browser for Qt5. [问题发生概率]：必现 [复现步骤]： /usr/bin/assistant-qt5 --help
通过ssh连接时需要设置DISPLAY环境变量。 比如export DISPLAY=xx.xx.xx.xx(ip):0.0 然后再执行assistant-qt5就不会出现coredump
export QT_QPA_PLATFORM=offscreen，就可以执行 root@iZbp10tndzn2fahsrwa0gnZ ~]# export QT_QPA_PLATFORM=offscreen [root@iZbp10tndzn2fahsrwa0gnZ ~]# /usr/bin/assistant-qt5 --help QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root' Unknown option: --help Usage: assistant [Options] -collectionFile file Uses the specified collection file instead of the default one -showUrl url Shows the document with the url. -enableRemoteControl Enables Assistant to be remotely controlled. -show widget Shows the specified dockwidget which can be "contents", "index", "bookmarks" or "search". -activate widget Activates the specified dockwidget which can be "contents", "index", "bookmarks" or "search". -hide widget Hides the specified dockwidget which can be "contents", "index" "bookmarks" or "search". -register helpFile Registers the specified help file (.qch) in the given collection file. -unregister helpFile Unregisters the specified help file (.qch) from the give collection file. -setCurrentFilter filter Set the filter as the active filter. -remove-search-index Removes the full text search index. -rebuild-search-index Obsolete. Use -remove-search-index instead. Removes the full text search index. It will be rebuilt on next Assistant run. -quiet Does not display any error or status message. -help Displays this help.
(In reply to gitpush from comment #2) > export QT_QPA_PLATFORM=offscreen，就可以执行 > > > root@iZbp10tndzn2fahsrwa0gnZ ~]# export QT_QPA_PLATFORM=offscreen > [root@iZbp10tndzn2fahsrwa0gnZ ~]# /usr/bin/assistant-qt5 --help > QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root' > Unknown option: --help > > > Usage: assistant [Options] > > -collectionFile file Uses the specified collection > file instead of the default one > -showUrl url Shows the document with the > url. > -enableRemoteControl Enables Assistant to be > remotely controlled. > -show widget Shows the specified dockwidget > which can be "contents", "index", > "bookmarks" or "search". > -activate widget Activates the specified dockwidget > which can be "contents", "index", > "bookmarks" or "search". > -hide widget Hides the specified dockwidget > which can be "contents", "index" > "bookmarks" or "search". > -register helpFile Registers the specified help file > (.qch) in the given collection > file. > -unregister helpFile Unregisters the specified help file > (.qch) from the give collection > file. > -setCurrentFilter filter Set the filter as the active filter. > -remove-search-index Removes the full text search index. > -rebuild-search-index Obsolete. Use -remove-search-index instead. > Removes the full text search index. > It will be rebuilt on next Assistant run. > -quiet Does not display any error or > status message. > -help Displays this help. 预览版当前还不支持桌面，图形化相关的组件支持不全。默认使用的插件功能支持不完善。 并且assistant-qt5命令获取help应该是-help，不是--help。
可以通过设置环境变量的方式：export QT_QPA_PLATFORM=offscreen 来确保命令执行 -help成功。