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POLet NodeJS application update itself using NPM
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  1. POLet NodeJS application update itself using NPM
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    copied!<p>Hej There,</p> <p>I'm trying to add some non-conventional functionality to my NodeJS application but I'm having some trouble. What I'm trying to do is the following: </p> <p>I want to update my server code from the client. (An auto-update functionality if you will.)</p> <p>My first attempt was to utilize the NPM API and run:</p> <pre><code> npm.commands.install([package], function(err, data) </code></pre> <p>But of course this results in an error telling me NPM can not install while the server is running.</p> <p>My second attempt was spawning NPM update using the following code:</p> <pre><code> spawnProcess('npm', ['update'], { cwd: projectPath }, done); </code></pre> <p>The spawnProcess function is a generic spawn function:</p> <pre><code>var projectPath = path.resolve(process.cwd()); var spawnProcess = function(command, args, options, callback) { var spawn = require('child_process').spawn; var process = spawn(command, args, options); var err = false; process.stdout.on('data', function(data) { console.log('stdout', data.toString()); }); process.stderr.on('data', function(data) { err = true; console.log('stderr', data.toString()); }); if (typeof callback === 'function') { process.on('exit', function() { if (!err) { return callback(); } }); } }; </code></pre> <p>But this gives me a stderr followed by a 'CreateProcessW: can not find file' error. I don't quite know what I'm doing wrong. </p> <p>If all else fails I thought it might be possible to write a shellscript killing Node, updating the application and then rebooting it. Something like:</p> <pre><code>kill -9 45728 npm update node server </code></pre> <p>But I don't know if this is a plausible solution and how I would go about executing it from my node server. I'd rather have the spawn function working of course.</p> <p>Any help is welcome. Thanks in advance!</p>
 

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