[Pkg-samba-maint] filtering on dh_listpackages in d/rules

[Michael Tokarev]

In d/rules we have several places which checks if certain packages are
in the dh_listpackages list (initially was inlined, I changed that to cached).

I wonder where this list can be different to start with. Might this be
the following fragment in d/rules:

# Ubuntu i386 binary compatibility only effort: Disable some i386 packages
ifeq ($(DEB_VENDOR) $(DEB_HOST_ARCH), Ubuntu i386)
         BUILD_PACKAGES += \
                 -Nctdb \
                 -Nlibpam-winbind \
                 -Nsamba \
                 -Nsamba-testsuite
endif

so that subsequent tests which referred to dh_listpackages were supposed
to depend on this -N list?

This is kinda twisted with the dh sequence.

%:
         dh $* --with python3 $(BUILD_PACKAGES)

So first we run d/rules which is parsed with full list of the
packages in dh_listpackages. But this does nothing, since we
just run dh $foo.  Which now gets the right -N thing, -- every
dh step does. So dh run ./d/rules again to perform some small
steps given by override_dh_foo. Parsing d/rules again. And
hopefully this time, we have it return a different list,
which now takes into account these -N arguments.  Note the
dh_listpackages call is _not_ done with these args, - I
suppose it is saved somewhere in the environment maybe so
all dh_foo tools knows about it.. or not?  Hmm...

At any rate this is definitely not obvious.

/mjt