Merge pull request #5624 from ilons/master

Should state that file provisioner requires source at execution time

website/source/docs/provisioners/file.html.md

@@ -48,6 +48,9 @@ The available configuration options are listed below. All elements are required.
     "upload". If it is set to "download" then the file "source" in the machine
     will be downloaded locally to "destination"
     
+The source file must exist before running Packer, this means that creating the 
+file with a provisioner does not work.
+
 ## Directory Uploads
 
 The file provisioner is also able to upload a complete directory to the remote
@@ -90,6 +93,9 @@ drwxr-xr-x  3 mwhooker  staff  102 Jan 27 17:10 a
 lrwxr-xr-x  1 mwhooker  staff    1 Jan 27 17:10 b -> a
 -rw-r--r--  1 mwhooker  staff    0 Jan 27 17:10 file1
 lrwxr-xr-x  1 mwhooker  staff    5 Jan 27 17:10 file1link -> file1
+$ ls -l toupload
+total 0
+-rw-r--r--  1 mwhooker  staff    0 Jan 27 17:10 files.tar
 ```
 
 ``` json
@@ -97,7 +103,7 @@ lrwxr-xr-x  1 mwhooker  staff    5 Jan 27 17:10 file1link -> file1
   "provisioners": [
     {
       "type": "shell-local",
-      "command": "mkdir -p toupload; tar cf toupload/files.tar files"
+      "command": "tar cf toupload/files.tar files"
     },
     {
       "destination": "/tmp/",