bash 如何正确终止 xvfb-run
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Howto terminate xvfb-run properly
提问by dpr
In order to perform some JavaScript unit tests with karmainside a docker container (based on ubuntu 14.04) I'm starting firefox in the container using a karma-script-launcherwith xvfb-run. The start script looks like this:
为了执行与一些JavaScript单元测试因缘泊坞窗容器内（基于Ubuntu 14.04），我使用的是火狐开始在容器卡玛-脚本启动用xvfb-run。启动脚本如下所示：
#!/bin/bash
set -o errexit
# nasty workaround as xvfb-run doesn't cleanup properly...
trap "pkill -f /usr/lib/firefox/firefox" EXIT
xvfb-run --auto-servernum --server-args='-screen 0, 1024x768x16' firefox
Starting the browser and executing the unit tests works very well. After executing the tests karma terminates the spawned browser instance - in my case the script that launched firefox over xvfb-run.
启动浏览器并执行单元测试效果很好。执行测试后 karma 终止了生成的浏览器实例 - 在我的例子中是通过 xvfb-run 启动 firefox 的脚本。
In the above script you can see that I registered a trapto kill the launched firefox on exit of my script. This works, but the script is not a very nice citizen as it terminates allinstances of firefox that are currently running instead of just terminating the one instance that was launched by the script. I first tried to kill the xfvb-runprocess but killing this process has no effect on the sub-process launched by the xvfb-runscript...
在上面的脚本中，您可以看到我trap在退出脚本时注册了一个来杀死启动的 Firefox。这是有效的，但该脚本不是一个很好的公民，因为它终止当前正在运行的所有Firefox 实例，而不是仅仅终止由脚本启动的一个实例。我首先尝试杀死该xfvb-run进程但杀死该进程对xvfb-run脚本启动的子进程没有影响......
If I start firefox over xvfb-runmanually there is a bunch of spawned processes:
如果我xvfb-run手动启动 firefox，则会有一堆衍生的进程：
root@1d7a5988e521:/data# xvfb-run --auto-servernum --server-args='-screen 0, 1024x768x16' firefox &
[1] 348
root@1d7a5988e521:/data# ps ax
PID TTY STAT TIME COMMAND
1 ? Ss 0:00 bash
348 ? S 0:00 /bin/sh /usr/bin/xvfb-run --auto-servernum --server-args=-screen 0, 1024x768x16 firefox
360 ? S 0:00 Xvfb :99 -screen 0, 1024x768x16 -nolisten tcp -auth /tmp/xvfb-run.bgMEuq/Xauthority
361 ? Sl 0:00 /usr/lib/firefox/firefox
378 ? S 0:00 dbus-launch --autolaunch bcf665e095759bae9fc1929b57455cad --binary-syntax --close-stderr
379 ? Ss 0:00 //bin/dbus-daemon --fork --print-pid 5 --print-address 7 --session
388 ? S 0:00 /usr/lib/x86_64-linux-gnu/gconf/gconfd-2
414 ? R+ 0:00 ps ax
root@1d7a5988e521:/data#
If I now kill the xvfb-runprocess (PID 348), only this process will be terminated, leaving the other processes running. If I kill the firefox process (PID 361) instead, the xvfb-runscript correctly terminates and kills the other processes as well. But from my script I only know the PID of the xvfb-runprocess...
如果我现在xvfb-run终止进程 (PID 348)，则只会终止该进程，而让其他进程继续运行。如果我改为xvfb-run终止firefox 进程 (PID 361)，脚本会正确终止并终止其他进程。但是从我的脚本中我只知道xvfb-run进程的 PID ......
During my research I stumbled across this rather old bug reportfor xvfb-runwhich still seems to be valid in spite of the bug's status beeing fixed back in 2012.
在我的研究，我偶然发现这个相当老的bug报告为xvfb-run这似乎仍然是尽管错误的状态在2012年beeing固定靠背有效。
Is there any polite way to terminate the xvfb-runprocess in order for the other processes to be cleaned up correctly?
是否有任何礼貌的方式终止xvfb-run进程以便正确清理其他进程？
采纳答案by dpr
I posted this question on unix.stackexchange.com some time ago as this is more related to Unix/Linux than to programming in general and did not attract much attention here:
我前段时间在 unix.stackexchange.com 上发布了这个问题，因为这与 Unix/Linux 的关系比一般的编程更相关，并且在这里没有引起太多关注：
Howto terminate xvfb-run properly @ Unix & Linux
如何在 Unix 和 Linux 上正确终止 xvfb-run
However the only option to terminate the X-programs correclty seems to be the not use xvfb-run and to write your own script to start the processes with Xvfb.
然而，终止 X 程序正确性的唯一选择似乎是不使用 xvfb-run 并编写自己的脚本以使用 Xvfb 启动进程。
