Merge pull request #8442 from atom/portable-mode

Enable Portable Mode

src/atom-environment.coffee

@@ -1,5 +1,6 @@
 crypto = require 'crypto'
 path = require 'path'
+ipc = require 'ipc'
 
 _ = require 'underscore-plus'
 {deprecate} = require 'grim'
@@ -203,6 +204,15 @@ class AtomEnvironment extends Model
 
     @observeAutoHideMenuBar()
 
+    checkPortableHomeWritable = ->
+      responseChannel = "check-portable-home-writable-response"
+      ipc.on responseChannel, (response) ->
+        ipc.removeAllListeners(responseChannel)
+        atom.notifications.addWarning("#{response.message.replace(/([\\\.+\\-_#!])/g, '\\$1')}") if not response.writable
+      ipc.send('check-portable-home-writable', responseChannel)
+
+    checkPortableHomeWritable()
+
   setConfigSchema: ->
     @config.setSchema null, {type: 'object', properties: _.clone(require('./config-schema'))}
 

src/browser/atom-portable.coffee

@@ -0,0 +1,32 @@
+fs = require 'fs-plus'
+path = require 'path'
+ipc = require 'ipc'
+
+module.exports =
+class AtomPortable
+  @getPortableAtomHomePath: ->
+    execDirectoryPath = path.dirname(process.execPath)
+    path.join(execDirectoryPath, '..', '.atom')
+
+  @isPortableInstall: (platform, environmentAtomHome, defaultHome) ->
+    return false unless platform is 'win32'
+    return false if environmentAtomHome
+    return false if not fs.existsSync(@getPortableAtomHomePath())
+    # currently checking only that the directory exists  and is writable,
+    # probably want to do some integrity checks on contents in future
+    @isPortableAtomHomePathWritable(defaultHome)
+
+  @isPortableAtomHomePathWritable: (defaultHome) ->
+    writable = false
+    message = ""
+    try
+      writePermissionTestFile = path.join(@getPortableAtomHomePath(), "write.test")
+      fs.writeFileSync(writePermissionTestFile, "test") if not fs.existsSync(writePermissionTestFile)
+      fs.removeSync(writePermissionTestFile)
+      writable = true
+    catch error
+      message = "Failed to use portable Atom home directory (#{@getPortableAtomHomePath()}).  Using the default instead (#{defaultHome}).  #{error.message}"
+
+    ipc.on 'check-portable-home-writable', (event) ->
+      event.sender.send 'check-portable-home-writable-response', {writable, message}
+    writable

src/browser/main.coffee

@@ -60,6 +60,8 @@ setupCrashReporter = ->
 setupAtomHome = ->
   return if process.env.ATOM_HOME
   atomHome = path.join(app.getHomeDir(), '.atom')
+  AtomPortable = require './atom-portable'
+  atomHome = AtomPortable.getPortableAtomHomePath() if AtomPortable.isPortableInstall(process.platform, process.env.ATOM_HOME, atomHome)
   try
     atomHome = fs.realpathSync(atomHome)
   process.env.ATOM_HOME = atomHome