[Bug 1762920] Re: casper-helpers:try_mount doesn't honor the mount point

[Ubuntu Foundations Team Bug Bot]

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-
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** Tags added: patch

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https://bugs.launchpad.net/bugs/1762920

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

Status in casper package in Ubuntu:
  New

Bug description:
  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.

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