Bug#801483: The environmental variable 'TMPDIR' is made unset by "lintian"

[Bjarni Ingi Gislason <bjarniig@rhi.hi.is>]

Package: lintian
Version: 2.5.30+deb8u4
Severity: important

Dear Maintainer,

   * What led up to the situation?

  Seeking an error that came when executing "lintian".

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

  The folowing simple script shows the error:

#!/bin/bash

set -u

echo TMPDIR is $TMPDIR

/usr/bin/man $*

# end of script.

  Put the script, named "man",  in a directory that is searched before "/usr/bin".

  Command line (any "deb"-file can be used (that contains a man-page?)):

lintian -C manpages /var/cache/apt/archives/lintian_2.5.30+deb8u4_all.deb

   * What was the outcome of this action?

W: lintian: manpage-has-errors-from-man usr/share/man/man1/lintian-info.1.gz  line 5: TMPDIR: unbound variable
W: lintian: manpage-has-errors-from-man usr/share/man/man1/lintian.1.gz  line 5: TMPDIR: unbound variable

   * What outcome did you expect instead?

  That the environmental variable "TMPDIR" retains its value.

##

  There are two errors in "lintian", reported separately.  The first
report is Debian #801482.

  Here, the environmental variable TMPDIR has been unset by "lintian". 
It has the value '/tmp'.

-- System Information:
Debian Release: 8.2
  APT prefers stable
  APT policy: (990, 'stable'), (500, 'stable-updates'), (500, 'proposed-updates')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.7-ckt11-u3 (SMP w/2 CPU cores)
Locale: LANG=is_IS.iso88591, LC_CTYPE=is_IS.iso88591 (charmap=ISO-8859-1)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages lintian depends on:
ii  binutils                       2.25-5
ii  bzip2                          1.0.6-7+b3
ii  diffstat                       1.58-1
ii  file                           1:5.22+15-2
ii  gettext                        0.19.3-2
ii  hardening-includes             2.6
ii  intltool-debian                0.35.0+20060710.1
ii  libapt-pkg-perl                0.1.29+b2
ii  libarchive-zip-perl            1.39-1
ii  libclass-accessor-perl         0.34-1
ii  libclone-perl                  0.37-1+b1
ii  libdpkg-perl                   1.17.25
ii  libemail-valid-perl            1.195-1
ii  libfile-basedir-perl           0.03-1
ii  libipc-run-perl                0.92-1
ii  liblist-moreutils-perl         0.33-2+b1
ii  libparse-debianchangelog-perl  1.2.0-1.1
ii  libtext-levenshtein-perl       0.11-1
ii  libtimedate-perl               2.3000-2
ii  liburi-perl                    1.64-1
ii  man-db                         2.7.0.2-5
ii  patchutils                     0.3.3-1
ii  perl [libdigest-sha-perl]      5.20.2-3+deb8u1
ii  t1utils                        1.38-4

Versions of packages lintian recommends:
pn  libperlio-gzip-perl             <none>
ii  perl                            5.20.2-3+deb8u1
ii  perl-modules [libautodie-perl]  5.20.2-3+deb8u1

Versions of packages lintian suggests:
pn  binutils-multiarch     <none>
ii  dpkg-dev               1.17.25
ii  libhtml-parser-perl    3.71-1+b3
ii  libtext-template-perl  1.46-1
pn  libyaml-perl           <none>
ii  xz-utils               5.1.1alpha+20120614-2+b3

-- no debconf information

-- 
Bjarni I. Gislason