Hi this may be a simple question but i can't figure out how could I, using chproc.exec open an application, but my current program is running as root and I need the childprocess to run as a user.
How Could I achieve that?
Current code :
chproc.exec("google-chrome").unref();
Related
I did some searches for this topic and found some prior threads, but I did not understand any of them as I am still a total beginner in Python.
I have a Python script which has some long string variables stored in various .py files in a sub-directory. I'm importing the .py files from that sub-directory when I run the script. There is a __init__.py file in the sub-directory. The only reason I'm using this setup is that the long string variables which I'm storing in those other files would make the code very difficult to read as they are SQL strings and can span 50-100 lines each.
Everything works perfectly when I run this script through PyCharm.
However, when I run the script through Windows Scheduler or a batch file, I get an ImportError for all of the .py files in the sub-directory. The problem is definitely related to the python script not knowing where to look for those .py files when it's run through Windows Scheduler. But I'm not sure how to fix it.
The action for the scheduler task is to run the python exe
D:\Python35\python.exe
with the argument as the script
D:\python\tableaudatasourcebuilds\dcitechnicalperformance\dcitechnicalperformance0.py
So the full action looks like:
D:\Python35\python.exe "D:\python\tableaudatasourcebuilds\dcitechnicalperformance\dcitechnicalperformance0.py"
The subdirectory which stores the long string variables .py files is:
D:\python\tableaudatasourcebuilds\dcitechnicalperformance\dcitechnicalperformance0\
The imports look like:
from dcitechnicalperformance.dcitechnicalperformance0.dciquer import nzsqldciwk
Does anyone know how to address this problem? Any help is much appreciated.
Good afternoon,
First of all i don't know how much sense there is to store long SQL querys on a module, I'm not by any means an expert, but something like a JSON file (or hell, even store them in a table inside the sql) seems like a better approach.
About your problem I think it resides on the current directory where the task is launched, let me explain:
In PyCharm when you run the code it launches from the location of the file, and with so, it's able to find the directory with the module.
With the scheduled task it may be launching in another directory and so, it's unable to find the module as the directory is not present.
If you decide to stick with your reproach a plausible solution would be to create a .bat file that browses to the project location:
#ECHO OFF
D:
cd D:\python\tableaudatasourcebuilds\dcitechnicalperformance\
D:\Python35\python.exe dcitechnicalperformance0.py
And that should work.
This question already has answers here:
How can I make Node.js 'require' absolute? (instead of relative)
(39 answers)
Closed 8 years ago.
I'm creating an express 4 project and many of my files are nested within folders. Unfortunately I using a lot of :
var x = require('../../../../file');
I'm thinking I can avoid this if I have access to the base url of the project, but I'm seeing that using a global variable isn't a good idea. What's the best way to tackle this?
If you want directory of the root script from which the node process started, you can get it like this:
var root = require.main.filename.slice(0,require.main.filename.lastIndexOf('/'))
or, as #ChiChou suggested:
var root = require('path').dirname(require.main.filename)
This assumes that the main script (or any other script that requires your code) is run from the root directory.
You can use this root as your "base url".
I'm trying to execute code on a remote machine (virtual), which runs a webserver with a single POST form, intended to do a simple ping. On the other side is the following script (part of it):
exec("/bin/ping -c 4 ".$_POST["addr"]);
"addr" is where the data entered in the POST form goes. So basically it calls /bin/ping and appends whatever data I enter. The question is how can I leverage this to get a shell? I think that since the ping command runs with root privileges it should be fairly easy but I'm still new to this game and couldn't find any useful info on how to do this. Help will be very much appreciated :)
I have a node.js application, which connect everyday to a server.
On this server, a new version of the app can be available, if so, the installed app download it, check if the download is complete, and if so, stop itself calling a shell script, which replace the old app by the new one, and start it.
I m struggling at starting the update script.
I know I can start it with child_process_execFile function, which I do:
var execF = require('child_process').execFile;
var PATH = process.argv[1].substr(0, process.argv[1].lastIndexOf('/')+1),
filename = 'newapp.js',
execF(PATH + 'up.sh', [PATH + filename], function () {console.log('done'); return ;});
up.sh, for now is just:
cat $1 > /home/pi/test
I get 'done' printed in the console, but test isn t created.
I know that execFile create a subprocess, is it what block the script to do that?
If I suceed to start this, I know I only have to make some cp in the script to have my app auto-updating.
EDIT:
Started as usual (calling the script from console), it work well, is there a reason for the script to don t execute when called from node.js?
I'd suggest that you consider using a module that can do this for you automatically rather than duplicating the effort. Or, at least use their technique as inspiration for you own requirements.
One example is: https://github.com/edwardhotchkiss/always
It's simple to use:
Usage: always <app.js>
=> always app.js
Then, anytime your code changes, the app is killed, and restarted.
As you can see in the source, it uses the Monitor class to watch a specified file, and then uses spawn to kick it off (and of course kill to end the process when a change has happened).
Unfortunately, the [always] output is currently hardcoded into the code, but it would be a simple change/pull request I'm sure to make it optional/configurable. If the author doesn't accept your change, you could just modify a local copy of the code (as it's quite simple overall).
Make sure when you spawn/exec the process you are executing the shell that will be processing the script and not the script itself.
Should be something like
execF("/usr/bin/sh", [PATH + 'up.sh', PATH + filename]);
All standards compliant applications in Linux store a desktop schema in /usr/share/applications/. In my particular use case, I have a WnckWindow data structure and I can get a pid from that. Using this pid, I can extract the command line from the proc.
Unfortunately, it seems that the proc command line entry does not match the desktop schema launch parameters. For example, the 'thunderbird' application is launched via /usr/bin/thunderbird but this is just a shell script which activates the real executable: /usr/lib/thunderbird-8.0/thunderbird-bin.
The real executable cannot be launched directly as it is dependent on the library paths configured in the /usr/bin/thunderbird script. Does anyone have any advice on how to match process id numbers to the appropriate desktop schema without getting caught by the issue I've described?, Thanks.
Ok, well, it appears that there's no nice way of solving this using the pid, however, it is relatively easy to match the Wnck windows class to application desktop schemas. The Wnck windows class needs to be preprocessed a little first to ensure that the filter works but it's pretty trivial stuff. Once you've got a good set of target strings, eg 'Thunderbird' or 'Google' + 'Chrome', you can use the system application menu API to zero in on a likely candidate, for example, by using garcon on Xfce.