[Bug 1241236] Re: write ubuntu_command file atomically

[Barry Warsaw]

** Changed in: system-image (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1241236

Title:
  write ubuntu_command file atomically

Status in Ubuntu system image (server/client/updater):
  Fix Released
Status in “system-image” package in Ubuntu:
  Fix Released

Bug description:
  There's a small window of opportunity for mischief.   Let's say
  something goes wrong while we're writing the ubuntu_command file, and
  yet the device still gets rebooted.  recovery will see the incomplete
  ubuntu_command file and will apply an incomplete set of commands,
  which could brick the phone.

  The solution is rather easy: write the ubuntu_command file atomically.
  If a failure occurs during write, then recovery won't see an update.
  Only once the file is successfully written do we toggle the file in
  place and reboot.

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