mirror of
https://github.com/balena-os/balena-supervisor.git
synced 2024-12-21 06:33:30 +00:00
136 lines
3.5 KiB
CoffeeScript
136 lines
3.5 KiB
CoffeeScript
{spawn} = require('child_process')
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{getpwnam} = require('posix')
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async = require('async')
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{EventEmitter} = require('events')
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_ = require('lodash')
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state = require('./state')
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class Application extends EventEmitter
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constructor: (@repo, @path, @user) ->
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EventEmitter.call(this)
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@process = null
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@inprogress = false
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@queue = []
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@options =
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cwd: @path
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stdio: 'inherit'
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uid: getpwnam(@user).uid
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gid: getpwnam(@user).gid
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env:
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USER: @user
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USERNAME: @user
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HOME: "/home/#{@user}"
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_init: (callback) ->
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tasks = [
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# Create the directory for the project
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(callback) =>
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spawn('mkdir', ['-p', @path]).on('exit', callback).on('error', callback)
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# Change the owner to the user
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(callback) =>
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spawn('chown', [@user, @path]).on('exit', callback).on('error', callback)
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# Initalize a new empty git repo
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(callback) =>
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spawn('git', ['init'], @options).on('exit', callback).on('error', callback)
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# Add the remote origin to the repo
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(callback) =>
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spawn('git', ['remote', 'add', 'origin', @repo], @options).on('exit', callback).on('error', callback)
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]
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@emit('pre-init')
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async.series(tasks, =>
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@emit('post-init')
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callback?(arguments...)
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)
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_exitHandler: (code, signal) ->
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@process = null
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_start: (callback) ->
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if not @process
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options =
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cwd: @path
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stdio: 'inherit'
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@process = spawn('sudo', ['-u', @user, 'foreman', 'start'], options)
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@process.on('exit', @_exitHandler.bind(@))
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@process.on('error', @_exitHandler.bind(@))
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@emit('start')
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callback?()
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_stop: (callback) ->
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# Kill will return false if process has already died
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handler = =>
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@process = null
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@emit('stop')
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callback?(arguments...)
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spawn('pkill', ['-TERM', '-P', @process.pid], @options).on('exit', handler).on('error', handler)
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_update: (callback) ->
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tasks = [
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# Stop the application if running
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(callback) =>
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if @process
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@_stop(callback)
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else
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callback()
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# Fetch new commits
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(callback) =>
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spawn('git', ['fetch'], @options).on('exit', callback).on('error', callback)
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# Reset our master branch to origin/master
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(callback) =>
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spawn('git', ['reset', '--hard', 'origin/master'], @options).on('exit', callback).on('error', callback)
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# Save the new commit hash
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(callback) =>
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options = _.clone(@options)
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delete options.stdio
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ps = spawn('git', ['rev-parse', 'HEAD'], options).on('close', callback).on('error', callback)
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# The hash will always be on the first chunk as I/O buffers are always larger than 40 bytes
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ps.stdout.on('data', (hash) ->
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hash = '' + hash
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state.set('gitHash', hash.trim())
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)
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# Prune npm dependencies
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(callback) =>
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spawn('npm', ['prune'], @options).on('exit', callback).on('error', callback)
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# Install npm dependencies
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(callback) =>
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spawn('npm', ['install'], @options).on('exit', callback).on('error', callback)
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# Start the app
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(callback) =>
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@_start(callback)
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]
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@emit('pre-update')
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async.series(tasks, =>
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@emit('post-update')
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callback?(arguments...)
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)
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# These methods shouldn't be called in parallel, queue them if they conflict
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['start', 'stop', 'init', 'update'].forEach((method) ->
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Application::[method] = (callback) ->
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if @inprogress
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@queue.push([method, arguments])
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else
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@inprogress = true
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@['_' + method](=>
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@inprogress = false
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if @queue.length isnt 0
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[next, args] = @queue.shift()
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@[next](args...)
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callback?(arguments...)
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)
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)
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module.exports = Application
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