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Re: apt-get changelog is unsuccessful, but changelog exists

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On Sat, 5 Nov 2016, davidson@freevolt.org wrote:
[snip]
> In the example above, I sought to read a description of the differences
> between my currently installed libxslt1.1 package, and the more recent
> available version.
>
> Instead, to obtain changelogs, the 8-step workflow outlined below is
> typical for me. It seems to work fine, but I am curious why steps 1--4
> alone do not suffice.
>
> If anyone can give me a clue here, I would be grateful.
>
> WORKFLOW
[snap]

In case it helps clarify what is going on, here is example output from
that workflow:

# apt-get update # STEP 1
[Copious output about gets and hits, which i did not capture. Sorry.]
Fetched [xyz] kB in [u]s ([pqr] kB/s)
Reading package lists... Done

# apt-get -s upgrade # STEP 2
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
   libxslt1.1
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Inst libxslt1.1 [1.1.26-14.1+deb7u1] (1.1.26-14.1+deb7u2 Debian-Security:7.0/oldstable [i386])
Conf libxslt1.1 (1.1.26-14.1+deb7u1 Debian-Security:7.0/oldstable [i386])

$ apt-cache --no-all-versions show libxslt1.1 |sed -n '/^Description-en/,/^[^[:blank:]]/ p' # STEP 3
Description-en: XSLT 1.0 processing library - runtime library
  XSLT is an XML language for defining transformations of XML files from
  XML to some other arbitrary format, such as XML, HTML, plain text, etc.
  using standard XSLT stylesheets. libxslt is a C library which
  implements XSLT version 1.0.
  .
  This package contains the libxslt library used by applications for XSLT
  transformations.
Homepage: http://xmlsoft.org/xslt/

$ apt-get changelog libxslt1.1 # STEP 4
Err Changelog for libxslt1.1 (http://packages.debian.org/changelogs/pool/updates/main/libx/libxslt/libxslt_1.1.26-14.1+deb7u2/changelog)
   404  Not Found [IP: 5.153.231.3 80]
Err Changelog for libxslt1.1 (http://security.debian.org/pool/updates/main/libx/libxslt/libxslt_1.1.26-14.1+deb7u2.changelog)
   404  Not Found [IP: 128.31.0.63 80]
E: changelog download failed

$ apt-get --diff-only source libxslt1.1 # STEP 5
Reading package lists...
Building dependency tree...
Reading state information...
Picking 'libxslt' as source package instead of 'libxslt1.1'
NOTICE: 'libxslt' packaging is maintained in the 'Git' version control system at:
git://git.debian.org/debian-xml-sgml/libxslt.git
Need to get 47.0 kB of source archives.
Get:1 http://security.debian.org/ wheezy/updates/main libxslt 1.1.26-14.1+deb7u2 (diff) [47.0 kB]
Fetched 47.0 kB in 0s (91.1 kB/s)

$ gunzip libxslt_1.1.26-14.1+deb7u2.debian.tar.gz && tar xf libxslt_1.1.26-14.1+deb7u2.debian.tar # STEP 6

$ ls debian/ # STEP 7
changelog
compat
control
copyright
libxslt1.1.install
libxslt1.1.lintian-overrides
libxslt1.1.symbols
libxslt1-dev.doc-base
libxslt1-dev.install
libxslt1-dev.manpages
patches
python-libxslt1-dbg.install
python-libxslt1-dbg.lintian-overrides
python-libxslt1-dbg.preinst
python-libxslt1.examples
python-libxslt1.install
README.Debian
rules
source
TODO
watch
xslt-config.1
xsltproc.install
xsltproc.manpages

$ sed -n '1,/^[^[:blank:]]/ p' debian/changelog # STEP 8
libxslt (1.1.26-14.1+deb7u2) wheezy-security; urgency=medium

   * Non-maintainer upload by the LTS team.
   * 0019-Fix-heap-overread-in-xsltFormatNumberConversion.patch:
     + CVE-2016-4738: Patch from upstream to fix a potential heap overread
       that can cause arbitrary code execution or denial of service.
       Closes: #842570.

  -- Emilio Pozuelo Monfort <pochu@debian.org>  Sat, 05 Nov 2016 11:26:56 +0100

libxslt (1.1.26-14.1+deb7u1) wheezy-security; urgency=medium

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apt-get changelog is unsuccessful, but changelog exists davidson@freevolt.org - 2016-11-05 20:10 +0100
  Re: apt-get changelog is unsuccessful, but changelog exists davidson@freevolt.org - 2016-11-05 20:30 +0100
  Re: apt-get changelog is unsuccessful, but changelog exists Brian <ad44@cityscape.co.uk> - 2016-11-05 20:40 +0100
    Re: apt-get changelog is unsuccessful, but changelog exists Jochen Spieker <ml@well-adjusted.de> - 2016-11-05 21:00 +0100
      Re: apt-get changelog is unsuccessful, but changelog exists Brian <ad44@cityscape.co.uk> - 2016-11-05 21:40 +0100
    Re: apt-get changelog is unsuccessful, but changelog exists davidson@freevolt.org - 2016-11-05 21:30 +0100
      Re: apt-get changelog is unsuccessful, but changelog exists Greg Wooledge <wooledg@eeg.ccf.org> - 2016-11-07 14:20 +0100
        Re: apt-get changelog is unsuccessful, but changelog exists Brian <ad44@cityscape.co.uk> - 2016-11-07 20:50 +0100
          Re: apt-get changelog is unsuccessful, but changelog exists David Wright <deblis@lionunicorn.co.uk> - 2016-11-07 21:30 +0100
            Re: apt-get changelog is unsuccessful, but changelog exists Brian <ad44@cityscape.co.uk> - 2016-11-08 00:30 +0100
              Re: apt-get changelog is unsuccessful, but changelog exists David Wright <deblis@lionunicorn.co.uk> - 2016-11-08 01:20 +0100
                Re: apt-get changelog is unsuccessful, but changelog exists Brian <ad44@cityscape.co.uk> - 2016-11-08 20:20 +0100
                Re: apt-get changelog is unsuccessful, but changelog exists davidson@freevolt.org - 2016-11-13 22:30 +0100

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