This caused unbound error list growth, because each time
we dumped an error, the calls to _config->FindB() inside
operator << would add 3 new errors of the form:
W: Using unknown config option »apt::color« of type BOOL
Hence we are dumping an infinite list of errors, and eventually
that list will exceed available memory.
Parse last line in deb file correctly by adding a newline
While merging apt-pkg and apt-inst libraries the codepath of handling
deb files in apt-pkg was adapted to use the 'old' code from apt-inst
instead of fork&exec of dpkg-deb -I. The information we get this way
forms the main part of the package stanza, but we add a few
semi-optional fields to the stanza to make it look and work more
like a stanza we got from a repository.
Just be careful with the area where these two parts touch as if,
hypothetically, we would stip all newlines around the parts,
but forget to add a newline between them later, the two lines around
the merge would stick a bit too close together forming one which could
result in fun parsing errors if this merged line was previously e.g. a
well-formed Depends line and has now extra fluff attached.
This codepath has a history with too many newlines (#802553) though,
so how likely is it really that it will some day lack one you may ask.
