casper-helpers:try_mount doesn't honor the mount point

[Tomo]

I apologize for direct mentioning to the source codes.
Problem:
 try_mount() in casper-helpers script doesn't honor the mount-point parameter when mount-option != "ro".
 This is obvious on code, but it wouldn't what it meant to be.
 I guess,
   if the device is already mounted on A, and
     if the indicated mount point of which is the same as previous mounted (i.e. A; where_is_mounted() says),
      do mount -o remount ...
   else
      do mount -o bind ...
   whatever the indicated mount options are.

  This spec suffers in the case,
   setting persistence YES, boot media, especially USB, is multi-partitioned, and persistence data are on separated part from the base boot image.
      In that case, find_cow_device() falsely unmount /cdrom (because where_is_mounted() says '/cdrom' was
   previous mount point in the device searching iteration) and gone busybox prompt.
  There might be a fix find_cow_device() itself but, I thought that try_mount() is fundamental.

A patch attached is a sample to solve this.

Notice:
An attached patch was from my own fixed version, and contains find_cow_device() modification. Be careful when applying.

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "PATCH: casper-helpers try_mount() diff" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

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