[Bug 1547431] Re: Does not allow appstream files

[Stefan Bader]

SRU Justification:

Impact: When a new Xenial installation attempts to update its appstream
cache with an older version of apt-cacher-ng as its apt proxy, it will
fail with error messages about invalid files/locations.

Fix: A small addition to the embedded patterns backported from a newer
version of apt-cacher-ng allows to proxy appstream extensions again.

Testcase: Having an apt-cacher-ng proxy enabled for a Xenial system
(might require to manually delete the cached files before) apt-get
update will expose many 403 errors. After upgrading apt-cacher-ng those
will download ok.

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https://bugs.launchpad.net/bugs/1547431

Title:
  Does not allow appstream files

Status in apt-cacher-ng package in Ubuntu:
  Fix Released
Status in apt-cacher-ng source package in Precise:
  Confirmed
Status in apt-cacher-ng source package in Trusty:
  Confirmed
Status in apt-cacher-ng source package in Wily:
  New

Bug description:
  With appstream [1] showing up in Ubuntu, acng prevents apt-get update
  by returning 403 errors for .yml.gz files:

  W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/restricted/dep11/Components-amd64.yml  403  Forbidden file type or location: http://archive.ubuntu.com/ubuntu/dists/xenial/restricted/dep11/Components-amd64.yml.gz
  W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/universe/dep11/Components-amd64.yml  403  Forbidden file type or location: http://archive.ubuntu.com/ubuntu/dists/xenial/universe/dep11/Components-amd64.yml.gz

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: apt-cacher-ng 0.7.26-1
  ProcVersionSignature: Ubuntu 3.13.0-77.121-generic 3.13.11-ckt32
  Uname: Linux 3.13.0-77-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  Date: Fri Feb 19 11:08:51 2016
  SourcePackage: apt-cacher-ng
  UpgradeStatus: Upgraded to trusty on 2014-06-20 (608 days ago)
  modified.conffile..etc.apt.cacher.ng.security.conf: [inaccessible: [Errno 13] Permission denied: '/etc/apt-cacher-ng/security.conf']
  mtime.conffile..etc.apt.cacher.ng.acng.conf: 2015-05-06T22:26:51.074192

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