67 lines
2.1 KiB
CoffeeScript
67 lines
2.1 KiB
CoffeeScript
fs = require 'fs'
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path = require 'path'
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{spawn} = require 'child_process'
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appFolder = path.dirname process.execPath # i.e. my-app/app-0.1.13/
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updateExe = path.resolve appFolder, '..', 'Update.exe' # i.e. my-app/Update.exe
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exeName = path.basename process.execPath
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# Spawn a command and invoke the callback when it completes with an error
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# and the output from standard out.
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spawnUpdate = (args, detached, callback) ->
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try
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spawnedProcess = spawn updateExe, args, {detached}
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catch error
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# Shouldn't happen, but still guard it.
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process.nextTick -> callback error
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return
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stdout = ''
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stderr = ''
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spawnedProcess.stdout.on 'data', (data) -> stdout += data
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spawnedProcess.stderr.on 'data', (data) -> stderr += data
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errorEmitted = false
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spawnedProcess.on 'error', (error) ->
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errorEmitted = true
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callback error
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spawnedProcess.on 'exit', (code, signal) ->
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# We may have already emitted an error.
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return if errorEmitted
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# Process terminated with error.
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if code isnt 0
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return callback "Command failed: #{signal ? code}\n#{stderr}"
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# Success.
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callback null, stdout
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# Start an instance of the installed app.
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exports.processStart = (callback) ->
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spawnUpdate ['--processStart', exeName], true, ->
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# Download the releases specified by the URL and write new results to stdout.
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exports.download = (updateUrl, callback) ->
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spawnUpdate ['--download', updateUrl], false, (error, stdout) ->
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return callback(error) if error?
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try
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# Last line of output is the JSON details about the releases
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json = stdout.trim().split('\n').pop()
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update = JSON.parse(json)?.releasesToApply?.pop?()
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catch
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return callback "Invalid result:\n#{stdout}"
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callback null, update
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# Update the application to the latest remote version specified by URL.
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exports.update = (updateUrl, callback) ->
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spawnUpdate ['--update', updateUrl], false, callback
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# Is the Update.exe installed with the current application?
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exports.supported = ->
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try
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fs.accessSync updateExe, fs.R_OK
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return true
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catch
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return false
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