a5b93211e6
Previously, the auto updater would run as many squirrel processes as told. This introduces a little change where instead of spawning a second process, we attach to the already running process - or, if different arguments are passed, return and emit an error. This is not failsafe, but it ensures that we don't run into simple race condition crashes. Closes $5097
115 lines
3.4 KiB
JavaScript
115 lines
3.4 KiB
JavaScript
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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var spawnedArgs = []
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var spawnedProcess
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var isSameArgs = function (args) {
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return (args.length === spawnedArgs.length) && args.every(function (e, i) {
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return e === spawnedArgs[i]
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})
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}
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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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var spawnUpdate = function (args, detached, callback) {
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var 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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return callback('AutoUpdater process with arugments ' + 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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})
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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', function (data) {
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stdout += data
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})
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spawnedProcess.stderr.on('data', function (data) {
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stderr += data
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})
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errorEmitted = false
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spawnedProcess.on('error', function (error) {
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errorEmitted = true
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return 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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return callback('Command failed: ' + (signal != null ? signal : code) + '\n' + stderr)
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}
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// Success.
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return 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(['--processStart', 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.download = function (updateURL, callback) {
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return spawnUpdate(['--download', updateURL], false, function (error, stdout) {
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var json, 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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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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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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