120 lines
3.6 KiB
JavaScript
120 lines
3.6 KiB
JavaScript
'use strict'
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const fs = require('fs')
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const path = require('path')
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const spawn = require('child_process').spawn
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// i.e. my-app/app-0.1.13/
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const appFolder = path.dirname(process.execPath)
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// i.e. my-app/Update.exe
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const updateExe = path.resolve(appFolder, '..', 'Update.exe')
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const exeName = path.basename(process.execPath)
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let spawnedArgs = []
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let spawnedProcess
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const isSameArgs = (args) => args.length === spawnedArgs.length && args.every((e, i) => e === spawnedArgs[i])
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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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const spawnUpdate = function (args, detached, callback) {
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let error, errorEmitted, stderr, stdout
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try {
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// Ensure we don't spawn multiple squirrel processes
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// Process spawned, same args: Attach events to alread running process
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// Process spawned, different args: Return with error
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// No process spawned: Spawn new process
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if (spawnedProcess && !isSameArgs(args)) {
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// Disabled for backwards compatibility:
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// eslint-disable-next-line standard/no-callback-literal
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return callback(`AutoUpdater process with arguments ${args} is already running`)
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} else if (!spawnedProcess) {
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spawnedProcess = spawn(updateExe, args, {
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detached: detached,
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windowsHide: true
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})
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spawnedArgs = args || []
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}
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} catch (error1) {
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error = error1
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// Shouldn't happen, but still guard it.
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process.nextTick(function () {
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return callback(error)
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})
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return
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}
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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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})
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return spawnedProcess.on('exit', function (code, signal) {
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spawnedProcess = undefined
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spawnedArgs = []
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// We may have already emitted an error.
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if (errorEmitted) {
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return
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}
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// Process terminated with error.
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if (code !== 0) {
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// Disabled for backwards compatibility:
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// eslint-disable-next-line standard/no-callback-literal
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return callback(`Command failed: ${signal != null ? signal : code}\n${stderr}`)
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}
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// Success.
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callback(null, stdout)
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})
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}
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// Start an instance of the installed app.
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exports.processStart = function () {
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return spawnUpdate(['--processStartAndWait', exeName], true, function () {})
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}
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// Download the releases specified by the URL and write new results to stdout.
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exports.checkForUpdate = function (updateURL, callback) {
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return spawnUpdate(['--checkForUpdate', updateURL], false, function (error, stdout) {
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let ref, ref1, update
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if (error != null) {
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return callback(error)
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}
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try {
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// Last line of output is the JSON details about the releases
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const json = stdout.trim().split('\n').pop()
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update = (ref = JSON.parse(json)) != null ? (ref1 = ref.releasesToApply) != null ? typeof ref1.pop === 'function' ? ref1.pop() : void 0 : void 0 : void 0
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} catch (jsonError) {
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// Disabled for backwards compatibility:
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// eslint-disable-next-line standard/no-callback-literal
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return callback(`Invalid result:\n${stdout}`)
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}
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return callback(null, update)
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})
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}
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// Update the application to the latest remote version specified by URL.
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exports.update = function (updateURL, callback) {
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return spawnUpdate(['--update', updateURL], false, callback)
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}
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// Is the Update.exe installed with the current application?
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exports.supported = function () {
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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 (error) {
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return false
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}
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}
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