mozilla-b2g/platform_build — pull request #76 by AntonioMA (2014-09-16 15:24:59+00:00)
Title: Bug 1066723 - Create the external storage mount point on the recovery img

The recovery executable creates the mount point if it doesn't exist, but it creates only the last level. So if the mount point is /storage/sdcard it does a mkdir /storage/sdcard. And that fails if /storage doesn't exist already.