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[Martin Pitt <martin.pitt@xxxxxxxxxx>]

That may be, and for speedup reason this might be considered. But it's
still wrong to rely on the symlinks in ~/.cache:

 - The user might try and clean up after being low on space, and removing ~/.cache/ is a legitimate thing to do
 - With --all-users it's in no way guaranteed that you can actually access every user's home directory. They might be encrypted (ecryptfs), or on a remote storage, or you don't even know which users are on the system (LDAP and the like)

These are certainly not important use cases on today's phone, but they
are on a desktop, and we are aiming for convergence here I suppose? So
u-a-l still ought to also look into the click package's --pkgdir IMHO.

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bugs, which is subscribed to Ubuntu Application Launcher.
https://bugs.launchpad.net/bugs/1333215

Title:
  "Unable to find keyfile for application": Does not look for .desktop
  files in click pkgdir

Status in Ubuntu Application Launcher:
  Incomplete
Status in “click” package in Ubuntu:
  New
Status in “ubuntu-app-launch” package in Ubuntu:
  Incomplete

Bug description:
  For testing/autopkgtest I want/need to run click apps and their tests
  in a schroot or container, as the turnaround with real phones and the
  emulator is way too large. But in a container, ubuntu-app-launch fails
  with

  $ ubuntu-app-launch `ubuntu-app-triplet com.ubuntu.calculator`

  ** (process:766): WARNING **: Unable to find keyfile for application 'com.ubuntu.calculator_calculator_1.3.283'
  init: application-legacy (com.ubuntu.calculator_calculator_1.3.283-1403523098604203) pre-start process (770) terminated with status 1

  In strace I see that it looks for the .desktop file in the following
  locations:

    /home/ubuntu/.cache/ubuntu-app-launch/desktop/com.ubuntu.calculator_calculator_1.3.283.desktop
    /home/ubuntu/.local/share/applications/com.ubuntu.calculator_calculator_1.3.283.desktop
    /usr/local/share/applications/com.ubuntu.calculator_calculator_1.3.283.desktop
    /usr/share/applications/com.ubuntu.calculator_calculator_1.3.283.desktop

  but not in the click dir:

  $ click pkgdir com.ubuntu.calculator
  /opt/click.ubuntu.com/.click/users/@all/com.ubuntu.calculator

  The workaround is to create the symlink manually, then it works:

  $  ln -s `click pkgdir com.ubuntu.calculator`/*.desktop .cache/ubuntu-app-launch/desktop/`ubuntu-app-triplet com.ubuntu.calculator`.desktop
  $ ubuntu-app-launch `ubuntu-app-triplet com.ubuntu.calculator`

  But that's certainly not something that autopkgtest should do.

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