[Bug 1815187] Re: Fix crash when opening DepCache before Cache

[Julian Andres Klode]

Broken in security (ubuntu2.19), fixed in proposed (ubuntu2.20).

root at tt:~# apt search -o RootDir=/dev/null foobar
Segmentation fault (core dumped)
root at tt:~# apt install apt libapt-pkg4.12
[...]
Unpacking libapt-pkg4.12:amd64 (1.0.1ubuntu2.20) over (1.0.1ubuntu2.19) ...
Unpacking apt (1.0.1ubuntu2.20) over (1.0.1ubuntu2.19) ...
[...]
root at tt:~# apt search -o RootDir=/dev/null foobar
W: Unable to read /dev/null/etc/apt/sources.list.d/ - DirectoryExists (20: Not a directory)
W: Unable to read /dev/null/etc/apt/sources.list - RealFileExists (20: Not a directory)
E: Could not open file /dev/null/var/lib/dpkg/status - open (20: Not a directory)
E: The package lists or status file could not be parsed or opened.


** Tags removed: verification-needed verification-needed-trusty
** Tags added: verification-done verification-done-trusty

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https://bugs.launchpad.net/bugs/1815187

Title:
  Fix crash when opening DepCache before Cache

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Trusty:
  Fix Committed

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

  [Test case]
  Run apt search -o RootDir=/dev/null foobar, make sure it does not crash.

  [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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