core: handle EOFError when checking checksum [GH-2716]

CHANGELOG.md

@@ -5,6 +5,8 @@ BUG FIXES:
   - core: The version for `Vagrant.configure` can now be an int. [GH-2689]
   - core: `Vagrant.has_plugin?` tries to use plugin's gem name before
     registered plugin name [GH-2617]
+  - core: Fix exception if an EOFError was somehow raised by Ruby while
+    checking a box checksum. [GH-2716]
 
 ## 1.4.1 (December 18, 2013)
 

lib/vagrant/util/file_checksum.rb

@@ -28,8 +28,14 @@ class FileChecksum
 
     File.open(@path, "r") do |f|
       while !f.eof
-        buf = f.readpartial(BUFFER_SIZE)
-        digest.update(buf)
+        begin
+          buf = f.readpartial(BUFFER_SIZE)
+          digest.update(buf)
+        rescue EOFError
+          # Although we check for EOF earlier, this seems to happen
+          # sometimes anyways [GH-2716].
+          break
+        end
       end
     end