[Bug 1815188] [NEW] Fix crash when opening DepCache before Cache

[Julian Andres Klode]

Public bug reported:

[Impact]
apt search and probably other code crashes some time, as GetDepCache() in trusty does not call BuildCaches() first.

[Test case]
TODO, some apt search -o RootDir=<something> foobar

[Regression potential]
There may be some locking implications, as we build caches when opening depcache first, without locks. That said, the same code is in use in all post-trusty releases, and they work fine.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1815188

Title:
  Fix crash when opening DepCache before Cache

Status in apt package in Ubuntu:
  New

Bug description:
  [Impact]
  apt search and probably other code crashes some time, as GetDepCache() in trusty does not call BuildCaches() first.

  [Test case]
  TODO, some apt search -o RootDir=<something> foobar

  [Regression potential]
  There may be some locking implications, as we build caches when opening depcache first, without locks. That said, the same code is in use in all post-trusty releases, and they work fine.

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