[Pbuilder-maint] Bug#358255: Make pbuilder fail with a meaningful error when .changes file is used instead of .dsc

[Oleksandr Moskalenko]

Package: pbuilder
Version: 0.150
Severity: wishlist

Please add a check to pbuilder to make it recognize if the .changes file is
used instead of the .dsc file in the "pbuilder build <file>" command and fail
with a meaningful warning.

Thank you,

Alex.

P.S.: Yes, I did foolishly try to build using the .changes file and, of
course, pbuilder was trying to use the package category "web" or "graphics" or
whatever I was building as a file name and failed with a message like this:

...
    -> copying [./web]
cp: cannot stat `./web': No such file or directory
    -> Aborting with an error
...


-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.15-mrb319
Locale: LANG=uk_UA.KOI8-U, LC_CTYPE=uk_UA.KOI8-U (charmap=KOI8-U)

Versions of packages pbuilder depends on:
ii  cdebootstrap                  0.3.11     Bootstrap a Debian system
ii  coreutils                     5.94-1     The GNU core utilities
ii  debianutils                   2.15.3     Miscellaneous utilities specific t
ii  debootstrap                   0.3.3      Bootstrap a basic Debian system
ii  gcc                           4:4.0.2-2  The GNU C compiler
ii  wget                          1.10.2-1   retrieves files from the web

Versions of packages pbuilder recommends:
ii  devscripts                    2.9.15     Scripts to make the life of a Debi
ii  fakeroot                      1.5.8      Gives a fake root environment
ii  sudo                          1.6.8p12-1 Provide limited super user privile

-- no debconf information