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Re: xz-compressed control metadata


On Sun, 2012-11-04 at 22:27:58 +0100, Guillem Jover wrote:
> On Sun, 2012-11-04 at 08:11:25 +0100, Guillem Jover wrote:
> > On Sat, 2012-11-03 at 21:56:12 +0100, Philipp Kern wrote:
> > > are there plans on the dpkg side to support other compression methods
> > > for the control.tar in .deb files? Some of the d-i udebs have large
> > > debconf templates which are only compressed with gzip, while xz would
> > > yield smaller udebs.
> > One problem is that I don't really feel like adding options to select
> > the compressor for each different ar member, so if the compressor is
> > global it means it cannot be switched to compress the control member
> > with anything other than gzip until a dpkg supporting unpacking that
> > is in stable, which would seem to be too late for that now (barring
> > an exception from the RT of course, althought that might still require
> > string changes which would be pretty annoying). And special casing
> > udebs is not an option either, because dpkg-deb does not have any
> > kind of knowledge about them in the first place.
> Having slept over this, it just ocurred to me that I'd be fine with a
> new option (something in spirit like --compressor-unified) for dpkg-deb,
> which once implemented could be used by debhelper exclusively for udebs
> already during jessie, and which would become a noop once and if the
> switch to the unified members compressor happens after jessie+1.
> I've added this to my TODO list for when I continue reworking the
> (un)packing code.

This is now implemented in dpkg 1.17.6, as the --uniform-compression
option for dpkg-deb.


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