Fix broken command parameter

spec/environment-spec.coffee

@@ -1,7 +1,7 @@
 child_process = require('child_process')
 {getShellEnv} = require("../src/environment")
 
-describe "Environment handling", ->
+fdescribe "Environment handling", ->
   describe "when things are configured properly", ->
     beforeEach ->
       spyOn(child_process, "spawnSync").andReturn
@@ -21,7 +21,7 @@ describe "Environment handling", ->
   describe "when an error occurs", ->
     beforeEach ->
       spyOn(child_process, "spawnSync").andReturn
-        error: new Error
+        error: new Error("testing when an error occurs")
 
     it "returns undefined", ->
       expect(getShellEnv()).toBeUndefined()

src/atom-environment.coffee

@@ -231,7 +231,8 @@ class AtomEnvironment extends Model
     checkPortableHomeWritable()
 
     # Patch the `process.env` on startup to fix the problem first documented
-    # in #4126
+    # in #4126. Retain the original in case someone needs it.
+    process._originalEnv = process.env
     process.env = @project.getEnv()
 
   attachSaveStateListeners: ->

src/environment.coffee

@@ -12,7 +12,7 @@ getRawShellEnv = ->
   # work with csh or tcsh. Given that bash and zsh should cover the
   # vast majority of users and it gracefully falls back to prior behavior,
   # this should be safe.
-  results = child_process.spawnSync shell, ["-ilc"], input: "env", encoding: "utf8"
+  results = child_process.spawnSync(shell, ["-ilc", "env"], encoding: "utf8")
   return if results.error?
   return unless results.stdout and results.stdout.length > 0