[Bug 1233521] Re: system-image cannot recover from a partial download without rebooting

[Launchpad Bug Tracker]

** Branch linked: lp:ubuntu/saucy-proposed/system-image

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https://bugs.launchpad.net/bugs/1233521

Title:
  system-image cannot recover from a partial download without rebooting

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

Bug description:
  In response to bug #1228254, u-d-m now throws a dbus error if it's
  asked in unconfined mode for a file that already exists.  This
  combines with system-image behavior to make it impossible to recover
  from a failed download without rebooting the device. I think system-
  image needs to check for already-downloaded files on the system in the
  expected path, and either remove them unconditionally for redownload,
  or spot-verify their sums and omit any correctly-downloaded files from
  the request to u-d-m.

  Relatedly, system-image needs to stop using a well-known path under
  /tmp for these files.  This needs to move to a root-only directory
  instead.  (While s-i could use proper tmpdir handling to create a
  private directory under /tmp without risking a DoS or symlink attack,
  this would have undesirable semantics wrt retries, because subsequent
  s-i processes would necessarily be asking u-d-m to download files to
  different directories each time.)  From an FHS standpoint, I think the
  correct location for these downloads is /var/cache/system-image.  That
  would need to be coordinated with lxc-android-config to get this
  directory made writable.  Alternatively, the files should just be
  downloaded directly to /android/cache/recovery (under an appropriate
  tmp/"in-progress" directory name), which would save having to do a
  cross-filesystem copy after download.

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