[Pkg-mozext-maintainers] Bug#732254: dh_xul-ext -a fails if "dpkg-vendor --query Vendor" returns anything other then "Debian" or "Ubuntu"

[peter green]

Package: mozilla-devscripts

While building enigmail for raspbian one of our autobuilders ran into 
the following error.

make[1]: Leaving directory `/«PKGBUILDDIR»'
   dh_xul-ext -a
dh_xul-ext: Unknown vendor "Raspbian" specified.

Some investigation revealed that the code uses "dpkg-vendor --query 
Vendor" to determine the vendor name. It then looks for a file called 
/usr/share/mozilla-devscripts/xul-app-data.csv.<Vendor>, if it doesn't 
find it it fails.

It appears the intent of this is to use different options on Debian and 
Ubuntu. However it leads to failure on other derivatives which is 
obviously undesirable.

You could try and add entries for all derivatives explicitly but I don't 
think that is a good soloution (in particular I belive we should strive 
to make life as easy as possible for new derivatives). IMO what you 
should be doing is distinguishing Ubuntu and it's derivatives from 
Debian and it's non-ubuntu based derivatives by using "dpkg-vendor 
--derives-from Ubuntu". I went ahead and implemented this.

Debdiff attatched, no intent to NMU.
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