Public bug reported:
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.
** Affects: system-image (Ubuntu)
Importance: High
Assignee: Barry Warsaw (barry)
Status: Triaged
** Affects: system-image (Ubuntu Saucy)
Importance: High
Assignee: Barry Warsaw (barry)
Status: Triaged
** Changed in: system-image (Ubuntu)
Importance: Undecided => High
** Changed in: system-image (Ubuntu)
Status: New => Triaged
** Also affects: system-image (Ubuntu Saucy)
Importance: High
Status: Triaged
** Changed in: system-image (Ubuntu Saucy)
Assignee: (unassigned) => Barry Warsaw (barry)
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https://bugs.launchpad.net/bugs/1233521
Title:
system-image cannot recover from a partial download without rebooting
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