Respect ATOM_HOME env var for portability

apm/package.json

@@ -6,6 +6,6 @@
     "url": "https://github.com/atom/atom.git"
   },
   "dependencies": {
-    "atom-package-manager": "0.134.0"
+    "atom-package-manager": "0.135.0"
   }
 }

atom.sh

@@ -75,9 +75,9 @@ elif [ $OS == 'Linux' ]; then
   SCRIPT=$(readlink -f "$0")
   USR_DIRECTORY=$(readlink -f $(dirname $SCRIPT)/..)
   ATOM_PATH="$USR_DIRECTORY/share/atom/atom"
-  DOT_ATOM_DIR="$HOME/.atom"
+  ATOM_HOME="${ATOM_HOME:-$HOME/.atom}"
 
-  mkdir -p "$DOT_ATOM_DIR"
+  mkdir -p "$ATOM_HOME"
 
   : ${TMPDIR:=/tmp}
 
@@ -88,9 +88,9 @@ elif [ $OS == 'Linux' ]; then
     exit $?
   else
     (
-    nohup "$ATOM_PATH" --executed-from="$(pwd)" --pid=$$ "$@" > "$DOT_ATOM_DIR/nohup.out" 2>&1
+    nohup "$ATOM_PATH" --executed-from="$(pwd)" --pid=$$ "$@" > "$ATOM_HOME/nohup.out" 2>&1
     if [ $? -ne 0 ]; then
-      cat "$DOT_ATOM_DIR/nohup.out"
+      cat "$ATOM_HOME/nohup.out"
       exit $?
     fi
     ) &

docs/customizing-atom.md

@@ -100,6 +100,14 @@ namespaces: `core` and `editor`.
 
 You can open this file in an editor from the _Atom > Open Your Config_ menu.
 
+### Custom Configuration Location
+
+You can override the location that Atom stores configuration files and folders
+in by setting the `ATOM_HOME` environment variable. The `ATOM_HOME` path will be
+used instead of `~/.atom` when it is set.
+
+This option can be useful when you want to make Atom portable across machines.
+
 ### Configuration Key Reference
 
 - `core`

src/6to5.coffee

@@ -96,7 +96,7 @@ getCachePath = (sourceCode) ->
 
   unless jsCacheDir?
     to5Version = require('6to5-core/package.json').version
-    cacheDir = path.join(fs.absolute('~/.atom'), 'compile-cache')
+    cacheDir = path.join(process.env.ATOM_HOME, 'compile-cache')
     jsCacheDir = path.join(cacheDir, 'js', '6to5', create6to5VersionAndOptionsDigest(to5Version, defaultOptions))
 
   path.join(jsCacheDir, "#{digest}.js")

src/atom.coffee

@@ -109,7 +109,7 @@ class Atom extends Model
   #
   # Returns the absolute path to ~/.atom
   @getConfigDirPath: ->
-    @configDirPath ?= fs.absolute('~/.atom')
+    @configDirPath ?= process.env.ATOM_HOME
 
   # Get the path to Atom's storage directory.
   #
@@ -263,9 +263,6 @@ class Atom extends Model
     # Make react.js faster
     process.env.NODE_ENV ?= 'production' unless devMode
 
-    # Set Atom's home so packages don't have to guess it
-    process.env.ATOM_HOME = configDirPath
-
     @config = new Config({configDirPath, resourcePath})
     @keymaps = new KeymapManager({configDirPath, resourcePath})
     @keymap = @keymaps # Deprecated

src/browser/atom-application.coffee

@@ -416,7 +416,7 @@ class AtomApplication
       PackageManager = require '../package-manager'
       fs = require 'fs-plus'
       @packages = new PackageManager
-        configDirPath: fs.absolute('~/.atom')
+        configDirPath: process.env.ATOM_HOME
         devMode: devMode
         resourcePath: @resourcePath
 

src/browser/main.coffee

@@ -14,6 +14,7 @@ process.on 'uncaughtException', (error={}) ->
   nslog(error.stack) if error.stack?
 
 start = ->
+  setupAtomHome()
   if process.platform is 'win32'
     SquirrelUpdate = require './squirrel-update'
     squirrelCommand = process.argv[1]
@@ -73,6 +74,18 @@ setupCoffeeScript = ->
     js = CoffeeScript.compile(coffee, filename: filePath)
     module._compile(js, filePath)
 
+setupAtomHome = ->
+  return if process.env.ATOM_HOME
+
+  if process.platform is 'win32'
+    home = process.env.USERPROFILE
+  else
+    home = process.env.HOME
+  atomHome = path.join(home, '.atom')
+  try
+    atomHome = fs.realpathSync(atomHome)
+  process.env.ATOM_HOME = atomHome
+
 parseCommandLine = ->
   version = app.getVersion()
   options = optimist(process.argv[1..])
@@ -89,8 +102,12 @@ parseCommandLine = ->
     opened or a new window if it hasn't.
 
     Environment Variables:
-    ATOM_DEV_RESOURCE_PATH  The path from which Atom loads source code in dev mode.
-                            Defaults to `~/github/atom`.
+
+      ATOM_DEV_RESOURCE_PATH  The path from which Atom loads source code in dev mode.
+                              Defaults to `~/github/atom`.
+
+      ATOM_HOME               The root path for all configuration files and folders.
+                              Defaults to `~/.atom`.
   """
   options.alias('d', 'dev').boolean('d').describe('d', 'Run in development mode.')
   options.alias('f', 'foreground').boolean('f').describe('f', 'Keep the browser process in the foreground.')

src/coffee-cache.coffee

@@ -5,7 +5,7 @@ CoffeeScript = require 'coffee-script'
 CSON = require 'season'
 fs = require 'fs-plus'
 
-cacheDir = path.join(fs.absolute('~/.atom'), 'compile-cache')
+cacheDir = path.join(process.env.ATOM_HOME, 'compile-cache')
 
 stats =
   hits: 0

src/less-compile-cache.coffee

@@ -1,14 +1,10 @@
 path = require 'path'
-fs = require 'fs-plus'
 LessCache = require 'less-cache'
-{Subscriber} = require 'emissary'
 
 # {LessCache} wrapper used by {ThemeManager} to read stylesheets.
 module.exports =
 class LessCompileCache
-  Subscriber.includeInto(this)
-
-  @cacheDir: path.join(require('./coffee-cache').cacheDir, 'less')
+  @cacheDir: path.join(process.env.ATOM_HOME, 'compile-cache', 'less')
 
   constructor: ({resourcePath, importPaths}) ->
     @lessSearchPaths = [
@@ -35,5 +31,3 @@ class LessCompileCache
 
   cssForFile: (stylesheetPath, lessContent) ->
     @cache.cssForFile(stylesheetPath, lessContent)
-
-  destroy: -> @unsubscribe()