[Bug 1750625] Re: update misinterprets 304 response on Packages.gz

[Julian Andres Klode]

That release file is sort of invalid, as we also need the uncompressed
Packages file hashed, because we check hashes after decompression too.

So usually you generate Packages, compress it (having both around), then
create Release file, and then delete the uncompressed Packages file if
you don't need it anymore.

I guess this should work more automatically, apt-ftparchive could
transparently decompress compressed files to add them to Release file.

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Title:
  update misinterprets 304 response on Packages.gz

Status in apt package in Ubuntu:
  Confirmed

Bug description:
  Description:	Ubuntu 16.04.3 LTS
  Release:	16.04

  ii  apt                              1.2.24                                      amd64        commandline package manager
  ii  apt-transport-https              1.2.24                                      amd64        https download transport for APT
  ii  apt-utils                        1.2.24                                      amd64        package management related utility programs
  ii  libapt-inst2.0:amd64             1.2.24                                      amd64        deb package format runtime library
  ii  libapt-pkg5.0:amd64              1.2.24                                      amd64        package management runtime library

  Expected behaviour:

  If apt-get gets a 304 Not Modified when requesting Packages.gz, it
  should ignore the package list (i.e., there's no update).

  Observed behaviour:

  Added a local repository to
  /etc/apt/sources.list.d/instafreight_php.list:

  > deb [arch=amd64 trusted=yes] http://ubuntu/instafreight xenial php

  The first time running apt-get update succeeds; in addition,
  apache.log shows:

  > 10.0.4.72 - - [20/Feb/2018:12:01:39 -0500] "GET
  /instafreight/dists/xenial/php/binary-amd64/Packages.gz HTTP/1.1" 200
  745 "-" "Debian APT-HTTP/1.3 (1.2.24)"

  I am able to install packages from that repo without error.

  Running apt-get a 2nd time succeeds. apache.log doesn't show a request
  for Packages.gz

  Running apt-get a 3rd time, apache.log shows:

  > 10.0.4.72 - - [20/Feb/2018:12:04:45 -0500] "GET
  /instafreight/dists/xenial/php/binary-amd64/Packages.gz HTTP/1.1" 304
  124 "-" "Debian APT-HTTP/1.3 (1.2.24)"

  However, on the console where I ran apt-get, the corresponding output
  is:

  > Err:15 http://ubuntu/instafreight xenial/php amd64 Packages
  >   404  Not Found
  > ...
  > E: Failed to fetch http://ubuntu/instafreight/dists/xenial/php/binary-amd64/Packages.gz  404  Not Found
  > E: Some index files failed to download. They have been ignored, or old ones used instead.

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