Bug#811072: regression in apt-get source to get source when binary has extra debian version

[Lennart Weller <weller@bfw-online.de>]

Package: apt
Version: 1.1.3
Severity: normal

The apt versions since stable have a bug in which apt-get source fails
to find the source package when the binary package has additional
version information. E.g. the current gdb version in testing 7.10-1+b1.

Here are some reproducible steps for a clean version of debian showing that
stable (1.0.9) works and testing (1.1.10) does not. The bug report version
1.1.3 also has the error, so the regression happened anywhere between 1.0.9 and
1.1.3.

docker -ti --rm debian:{stable,testing}

Steps in both containers:
  echo "deb-src http://httpredir.debian.org/debian testing main" >> /etc/apt/sources.list
  apt-get update
  apt-get source gdb/testing

stable:
  root@fd4bd6bde15f:/# apt-cache show apt
  Package: apt
  Status: install ok installed
  Version: 1.0.9.8.1
  [...]

  root@ec1b1e2b13c9:/# apt-get source gdb/testing
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Selected version '7.10-1' (testing) for gdb
  NOTICE: 'gdb' packaging is maintained in the 'Git' version control system at:
  git://anonscm.debian.org/pkg-gdb/gdb.git
  Need to get 19.2 MB of source archives.
  Get:1 http://httpredir.debian.org/debian/ testing/main gdb 7.10-1 (dsc) [2756 B]
  Get:2 http://httpredir.debian.org/debian/ testing/main gdb 7.10-1 (tar) [19.1 MB]
  Get:3 http://httpredir.debian.org/debian/ testing/main gdb 7.10-1 (diff) [52.5 kB]
  Fetched 19.2 MB in 1s (13.8 MB/s)

testing:
  root@8d2234fed551:/# apt-cache show apt
  Package: apt
  Status: install ok installed
  Architecture: amd64
  Version: 1.1.10
  [...]

  root@84f326c749e0:/# apt-get source gdb/testing
  Reading package lists... Done
  Building dependency tree... Done
  E: Can not find version '7.10-1+b1' of package 'gdb'
  E: Unable to find a source package for gdb

Using the option --only-source works on testing.


-- Package-specific info:

-- (/etc/apt/preferences present, but not submitted) --


-- (/etc/apt/sources.list present, but not submitted) --


-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (550, 'testing'), (500, 'stable'), (210, 'unstable'), (1, 'experimental')
Architecture: i386 (x86_64)

Kernel: Linux 3.17.8-64+ (SMP w/32 CPU cores; PREEMPT)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages apt depends on:
ii  adduser                 3.113+nmu3
ii  debian-archive-keyring  2014.3
ii  gnupg                   1.4.20-1
ii  gnupg2                  2.0.28-3
ii  gpgv                    1.4.20-1
ii  libapt-pkg5.0           1.1.3
ii  libc6                   2.19-22bfw1
ii  libgcc1                 1:5.3.1-5bfw1
ii  libstdc++6              5.3.1-5bfw1

apt recommends no packages.

Versions of packages apt suggests:
pn  apt-doc     <none>
ii  aptitude    0.7.4-1bfw1
ii  dpkg-dev    1.18.4
ii  python-apt  1.1.0~beta1

-- Configuration Files:
/etc/logrotate.d/apt changed [not included]

-- no debconf information