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Re: [RFC] Switching dpkg-deb --uniform-compression by default


Guillem Jover <guillem@debian.org> (2016-07-06):
> I'd like consider switching dpkg-deb --uniform-compression by default,
> so that both control.tar and data.tar members use the same
> compression, which currently would be xz (or gzip with -Zgzip).

(AFAICT 'none' is still supported, contrary to 'bzip2' and 'lzma').

That wouldn't seem crazy to me.

> This would give us more uniform and smaller packages. I think the d-i
> people wanted something like this (?).

[ Adding debian-boot@, where “the d-i people” are, and debian-cd@ for
  completeness. ]

A few years ago we pushed for xz compression in some key packages to try
and squeeze more packages into installation images, notably CD#1; ISTR
that would only change the data part and not the control one, which
would limit the size gain for some specific packages. debian-cd only
generates netinst CDs nowadays so that's no longer a hot topic for us

> Not all .deb parsers support control.tar.xz yet, but most do:
> <https://wiki.debian.org/Teams/Dpkg/DebSupport>

udpkg's status there seems correct (supports gz/xz/no compression), and
just to be sure: I've just checked that compression_type is indeed
handled independently for control (in udpkg.c's dpkg_unpackcontrol) and
for data (dpkg_dounpack).

> Would there be any objections to this?

Bottom-line from a d-i point of view: having both compression in sync by
default shouldn't change anything on our side (shouldn't gain us much
but shouldn't do much harm either).


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