I am writing an extension for vscode, and I need to get the environment variables of a process that is already running. But I wasn't able to find a way to do it.
I know how to do it in python using psutil:
for proc in psutil.process_iter(attrs=['name', 'exe']):
if proc.info['name'].lower() == 'SomeProcess.exe'.lower():
return proc.environ()
Is there something similar for javascript/nodejs?
You can use child_process module to spawn a terminal and execute the following commands wrt platform and get the variables, parse & use or write a native node module to access the proper APIs of each platform and get the output.
Windows (Using powershell, 2019 is the PID )
(Get-Process -id 2019).StartInfo.EnvironmentVariables
Linux
tr '\0' '\n' < /proc/2019/environ
Mac
ps eww -o command 2019 | tr ' ' '\n'
Thanks to https://serverfault.com/a/66366 & https://stackoverflow.com/a/28193753/12167785 & https://apple.stackexchange.com/a/254253 &
https://stackoverflow.com/a/11547409/12167785 &
https://stackoverflow.com/a/18765553/12167785
Combining with #SudhakarRS's answer:
var child = require('child_process').execFile('powershell', [
'(Get-Process SomeProcess).StartInfo.EnvironmentVariables'
], function(err, stdout, stderr) {
console.log(stdout);
});
If you want to debug it, make sure you peek at err and stderr.
Replacing SomeProcess with notepad works for me, but using notepad.exe does not.
On powershell you can get the processes with a particular name using Get-Process [process name].
So, for example, if I have 4 instances of notepad running and do Get-Process notepad, I see this:
You can get the process IDs with (Get-Process notepad).Id which returns:
You could use the same code to choose the ID:
var child = require('child_process').execFile(
'powershell',
['(Get-Process notepad).Id'],
function(err, stdout, stderr) {
var ids = stdout.split("\r\n");
ids.pop(); //remove the blank string at the end
console.log(ids);
}
);
^ which returns:
If you just want to grab the first process with a name, it's:
(Get-Process notepad)[0].StartInfo.EnvironmentVariables
^ obviously replace notepad with your process name.
Easyish way(from here, you can use something like shelljs then run:
ps faux | grep 'PROCESS_NAME'
Then extract the process id(I'm just working on a regex) and then do:
cat /proc/THE_PROCESS/environ | tr '\0' '\n'
You'll get the the env vars back as a string something like:
THEVAR=1
ANOTHERVAR=2
I reckon you just split the string by '\n' but I'm checking!
I'll update this once I figure the regex. **Are you on linux/mac or windows?
UPDATE: Check https://github.com/shelljs/shx for cross platform
There is no builtin way to do that in javascript/nodejs. If you really need to do it, then the best way is to run a command in the terminal and then parse the output to construct the object that you need.
yep:
process.env will give you what you need :)
you can read some more here.
EDIT: it will give you environment variables only for the process you're in... did I misunderstood and you want varibales of another process?
Related
I have a Node.js program where I need to, on a button click, run 2 commands in the Windows command line. For example, the process I'm trying to automate by the button click would be doable manually by going to cmd and entering the following commands:
pushd \\myserver.com\folder1\folder2 //Connect to remote server folder structure
mkdir NewFolder //Create new folder in the remote folder
I've found many resources pointing that I should use 'child_process', but I'm absolutely lost when it comes to shell scripting and am having a really hard time figuring out how to do this. Here's the code I have so far:
var cp = require('child_process');
cp.exec('pushd \\\\myserver.com\\folder1\\folder2\\', { shell: '/bin/bash' }, function(err, stdout, stderr){
if(err){
console.log(err);
}
});
But this above code just returns this error (which oddly removes the '\'s from the given dir):
{ Error: Command failed: pushd \\myserver.com\folder1\folder2\
/bin/bash: line 1: pushd: \myserver.comfolder1folder2: No such file or directory
at ChildProcess.exithandler (child_process.js:281:12)
killed: false,
code: 1,
signal: null,
cmd: 'pushd \\\\myserver.com\\folder1\\folder2\\' }
/bin/bash: line 1: pushd: \myserver.comfolder1folder2: No such file or directory
I'm really lost here and would appreciate any help. Any alternative you have to child_process may also be very helpful. Thank you!
Usually all the escape sequences used for string uses '\\' for a single backslash. It is understandable you used it here for the directory path for windows.
In JS particularly '\\' doesn't exactly work like that
'abc\
def' == 'abcdef' // true
'\a' == 'a' // true
When a '\' is not followed by a character with any special meaning, it is considered to be a LineContinuation instead.
As you can see from your error output using '\\\\myserver.com' considered '\myserver.com'. Plain workaround is to use '\\\\' for single '\' or use '/' for path separation which I'm not pretty sure if shell will execute it.
This is one of the blogs explains about it in details Link.
The shell is incorrect here:
{ shell: '/bin/bash' }
It should be:
{ shell: 'CMD.EXE' }
Because in the beginning of your post, you tell that you run 2 commands in the Windows command line, which indicates you are not using Bash, which is (usually) not installed on Windows.
I'm working on a project in node js and I need to get the file system type of a disk i.e., I want to know if it's FAT or NTFS etc...
Is there any way I can accomplish this with node js? Any help is appreciated . Thanks.
As you didn't specify target machine's operating system, you can use such command under Windows:
fsutil fsinfo volumeinfo <disk letter here>:
to show output simillar to this one:
H:\>fsutil fsinfo volumeinfo c:
Volume Name :
Volume Serial Number : 0x4c31bcb3
Max Component Length : 255
File System Name : NTFS
Supports Case-sensitive filenames
Preserves Case of filenames
Supports Unicode in filenames
Preserves & Enforces ACL's
Supports file-based Compression
Supports Disk Quotas
Supports Sparse files
Supports Reparse Points
Supports Object Identifiers
Supports Encrypted File System
Supports Named Streams
You need only to parse command output correctly. I would recommend you storing filesystem names in array and seeking for every in command output excluding first line. This way you can be sure which filesystem is used by target machine.
Here you have code to print what does this command output to your commandline:
const { exec } = require('child_process');
exec('fsutil fsinfo volumeinfo c:', (err, stdout, stderr) => {
if (err) {
// node couldn't execute the command
return;
}
// the *entire* stdout and stderr (buffered)
console.log(`stdout: ${stdout}`);
});
This is untested code, I really think that you want to write own snippet. I can't decide will this code work because I have no opportunity now.
Also, why would you check filesystem used?
you can use github.com/resin-io-modules/drivelist
then
const drivelist = require('drivelist');
drivelist.list((error, drives) => {
if (error) {
throw error;
}
console.log(drives);
});
I am developing a lib for docker command line in nodejs, I am still in starting face, I just tried basic docker run command using spawn in node js - everything works fine but it's not working for complex cases like the one below.
I want to run docker run --rm -it julia:0.3.6 julia -E "[x^2 for x in 1:100]" in nodejs, but I am gettting below error -
the input device is not a TTY
Docker Shell existed with status = 1
Below Code -
const
spawn = require('child_process').spawn,
dockerDeamon = spawn("docker", ["run","--rm", "-it", "julia:0.3.6", "-E", "\" [x^2 for x in 1:100]\""] );
dockerDeamon.stdout.on('data', data => {
console.log(`${data}`);
});
dockerDeamon.stderr.on('data', data => {
console.log(`${data}`);
});
dockerDeamon.on('close', code => {
console.log(`Docker Shell existed with status = ${code}`);
});
Is there any better way to execute the above script ?
You're passing the -t (--tty) flag to Docker, which tells it that it should expect the input and output to be attached to a terminal (TTY). However, when you're using spawn, you're instead attaching it to a Node.js stream in your program. Docker notices this and therefore gives the error Input device is not a TTY. Therefore, you shouldn't be using the -t flag in this case.
Also, note that you don't need nested quotes in your last argument, "\" [x^2 for x in 1:100]\"". The purpose of the quotes is to preserve the spaces and other special characters in the argument when running in a shell, but when you use spawn you're not using a shell.
So your statement should be something like:
dockerDeamon = spawn("docker", ["run","--rm", "-i", "julia:0.3.6", "julia", "-E", "[x^2 for x in 1:100]"] );
I'm using Grunt to kick off a unit-test framework (Intern), which ultimately pipes another node.js process that I'm then using Charm to output results to the screen. I'm having to pass in the terminal size information from a Grunt config option, but it's a bit messy and I'd like to try and get the terminal size from within the piped process, but the standard process.stdout.cols/getWindowSize are simply unavailable as the piped process doesn't register as TTY (although Charm works fine with it all).
Any suggestions?
EDIT Just to be clear here ... the Grunt JavaScript file is running in the main node.js process, but the file I'm attempting to retrieve this info from (and where I'm therefore running people's suggested commands) is in a spawned child process.
Try these:
tput cols tells you the number of columns.
tput lines tells you the number of rows.
echo -e "lines\ncols"|tput -S to get both the lines and cols
There's stty, from coreutils:
$ stty size #60 120 <= sample output
While running the below code in terminal prints the cols:
var sys = require('sys')
var exec = require('child_process').exec;
function puts(error, stdout, stderr) { sys.puts(stdout) }
exec("tput cols", puts);
The pty.js module can make a child act like a regular terminal.
var pty = require('pty.js');
var term = pty.spawn('bash', [], {
name: 'xterm-color',
cwd: process.env.HOME,
env: process.env
});
term.on('data', function(data) {
console.log(data);
});
term.write('ls\r');
term.resize(100, 40);
term.write('ls /\r');
console.log(term.process);
My requirement is I need to check whether Chrome browser is insatlled on the client machine or not using Javascript. I have searched on the net not able to find the way out.
Please help in getting this done.
You can't do that with JavaScript, and even if you could, you shouldn't.
JavaScript on the client doesn't have access to the user's system, for very good reasons. (Think, servers with bad intentions.)
You can check if the browser is Chrome with the next code
if(!window.chrome){
//Chrome code
}else{
// Chrome block
}
You can't. Not with JavaScript. However, you can check whether the browser that is currently being used to view your webpage is Google Chrome or not.
<script type="text/javascript">
if(window.chrome){
document.write("Browser is Chrome");
}
else{
document.write("Please download Chrome");
}
</script>
You can't get that kind of information directly from javascript.
What you can do is use that PowerShell command in a script and save the result in a file that you'll read later using javascript.
Get-ItemProperty HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName, DisplayVersion, InstallLocation, Publisher, InstallDate | Format-Table -AutoSize
This will get you all the installed programs on the machine from the HKEY_LOCAL_MACHINE registry folder.
The exact path to the folder from wich the informations are retrieved is : HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\
The given command will display you the application name followed by it's version, it's install location, publisher name and installation date in a PowerShell terminal.
If you want to output that list in a file simply add >FileName.txt after the command before pressing enter.
Note that by default the file will be created in the C:\Users\YourUserName\ folder so if you want the file to be created in a specific location you'll have to use the CD command to get to that specific location before executing the Get-Item-Property command.
This will get you done for the get installed programs on a machine part.
Now we can get into the check if app x is installed on the machine part.
First load the previously generated file in your js application you will use it's content to determine if an application is installed on the computer.
The faster way to get if 'chrome' is installed will be to load the file as a string and then do that basic stuff :
if (string.includes('chrome') == true) {
// chrome is installed on the machine
// you can do some more stuff
// like extracting it's path from the file content
} else {
console.log('error: chrome is not installed on this computer');
}
Needless to say that this will only work if used on the same computer from which you want to check the installed applications.
Edit: If you want a more practical file to use in javascript you can replace
Format-Table -AutoSize >FileName.txt
with :
Export-Csv -path .\FileName.txt -NoTypeInformation
this way you can split your file lines using the string.split(',') method and don't have to do some extra stuff to deal with the spaces between data.
Edit 2:
Here's a full working implementation that will let you retrieve informations from a PowerShell script directly from your javascript using NodeJs.
get_programs.ps1 (PowerShell script file) :
chcp 65001 # sets the encoding for displaying chars correctly
Get-ItemProperty HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName, DisplayVersion, InstallLocation | ConvertTo-Csv -NoTypeInformation
chcp 850 # restores the default encoding set this will avoid police changes due to the terminal modifications
Notice the change at the end of the command which is now:
| ConvertTo-Csv -NoTypeInformation
this allows to log data in the PowerShell terminal in the csv format which will simplify it's parsing as a string.
If you don't want to use another file to hold those few PowerShell
commands you can use this
child = spawn("powershell.exe",[`chcp 65001
Get-ItemProperty HKLM:\\Software\\Wow6432Node\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\* | Select-Object DisplayName, DisplayVersion, InstallLocation | ConvertTo-Csv -NoTypeInformation
chcp 850`]);
as a replacement for
child = spawn("powershell.exe",["./get_programs.ps1"]);
If you choose to do this don't forget to escape the \ chars else it will not work.
app.js :
var spawn = require("child_process").spawn,child;
child = spawn("powershell.exe",["./get_programs.ps1"]); // here we start our PowerShell script "./" means that it's in the same directory as the .js file
let chromeDetails;
child.stdout.on("data", (data) => { // data event
// here we receive each outputed line in the PowerShell terminal as an Uint8Array
if (data.includes('Chrome')) { // check for the 'Chrome' string in data
chromeDetails = data.toString(); // adds data converted as string
}
});
child.stderr.on("data", (data) => { // logs errors
console.log(`Powershell Errors: ${data}`);
});
child.on("exit", () => { // exit event
console.log("Powershell Script finished");
if (chromeDetails != undefined) {
console.log(`> chrome has been detected on this computer
available informations (appName, version, installPath):
${chromeDetails}`);
} else
console.log('> chrome has not been detected on this computer');
});
child.stdin.end(); // we end the child
Expected output :
Powershell Script finished
> chrome has been detected on this computer
available informations (appName, version, installPath):
"Google Chrome","103.0.5060.114","C:\Program Files\Google\Chrome\Application"
If you are not on Windows you may want to take a look at Spawning .bat and .cmd files on Windows from the NodeJs documentation to get hints on how to adapt the above app.js code to work on your system.