Double dependency problem with ${shlibs:Depends}, ${misc:Depends}, etc.

2010-02-28 Thread Osamu Aoki 
Hi,

Since lintian complains about missing ${misc:Depends}, people are adding
it to Depends: in debian/control.  This is good thing but there could be
complication.  One example is http://bugs.debian.org/548282  This is
causing double dependencies and creating uninstallable set of packages
in some cases.  In other, just ugly double dependencies. 

For python-gdata (2.0.7-1) which seems broken today also had:

  --\ Depends (4)
--- python
--- python (= 2.5) | python-celementtree | python-elementtree
--- python-support (= 0.90.0)
--- python2.4 (UNAVAILABLE)

This came from
Depends: ${shlibs:Depends}, ${misc:Depends}, ${python:Depends},
 python (= 2.5) | python-celementtree | python-elementtree

I do not know why python2.4 was introduced and why we need it.  I also
think depending both on python and python (= 2.5) looks ugly.  

This seems to be typical problem happening since lintian recommendation
for adding ${misc:Depends}.

Is there any best practice guides on this subject?

Can someone think of lintian check for this double dependency issue?

Osamu


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Re: Double dependency problem with ${shlibs:Depends}, ${misc:Depends}, etc.

2010-02-28 Thread Josselin Mouette 
Le lundi 01 mars 2010 à 00:08 +0900, Osamu Aoki a écrit : 
 For python-gdata (2.0.7-1) which seems broken today also had:
 
   --\ Depends (4)
 --- python
 --- python (= 2.5) | python-celementtree | python-elementtree
 --- python-support (= 0.90.0)
 --- python2.4 (UNAVAILABLE)
 
 This came from
 Depends: ${shlibs:Depends}, ${misc:Depends}, ${python:Depends},
  python (= 2.5) | python-celementtree | python-elementtree
 
 I do not know why python2.4 was introduced and why we need it.  

This is probably because of a broken shebang in a script. Blame
setuptools which replaces working shebangs by ones with the Python
version hardcoded.

 I also
 think depending both on python and python (= 2.5) looks ugly.  

This is a real dependency. If python version is  2.5 you need to pull
the elementtree module.

Now that python 2.5 is the default in stable, this could probably be
dropped in favor of requiring python = 2.5 and that would be all.

 This seems to be typical problem happening since lintian recommendation
 for adding ${misc:Depends}.

All these dependencies were added either manually or by
${python:Depends}, not by ${misc:Depends}.

-- 
 .''`.  Josselin Mouette
: :' :
`. `'   “I recommend you to learn English in hope that you in
  `- future understand things”  -- Jörg Schilling


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