Run a binary file with shared object dependencies on NodeJS / Express server

Question

I'm using NodeJS childprocess to run shell commands on NodeJS / Express server (localhost). Everything goes well with basic shell commands like 'ls' (from NodeJS documentation):

const { spawn } = require('child_process');
const ls = spawn('ls', ['-lh', '/usr']);

ls.stdout.on('data', (data) => {
console.log(`stdout: ${data}`);
});

ls.stderr.on('data', (data) => {
console.log(`stderr: ${data}`);
});

ls.on('close', (code) => {
console.log(`child process exited with code ${code}`); 
});

Now, what I need to do is run a binary file that has shared object dependencies. The objects are located inside server folder 'public/libraries'. I've tried to modify the previous with

const runBinary = spawn('/path/to/binary/file', ['-someoption', 'public/libraries']);

The error message is 'error while loading shared libraries ... no such file or directory', meaning the shared objects are not found. I have no idea how to

1) tell 'runBinary' the location of the folder of shared objects, and then

2) run the binary successfully to create output in console.

I have all the necessary tools installed to run the binary in a Bash shell and have tested it works as it should.

Any ideas?

John Zwinck · Accepted Answer · 2018-08-20 12:08:40Z

3

You can fix this by setting the environment variable LD_LIBRARY_PATH to the absolute path of your public/libraries directory.

Something like this:

spawn('/path/to/binary/file', ['-someoption'],
      {env: {LD_LIBRARY_PATH: '/path/to/public/libraries'}})

answered Aug 20, 2018 at 12:08

John Zwinck

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1 Comment

John Zwinck Over a year ago

@R.Järvinen: You're welcome. You can accept this answer by clicking the checkmark on the left. Welcome to Stack Overflow.

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