Bug#837649: debootstrap: Add support for Packages.xz

[Ansgar Burchardt <ansgar@debian.org>]

Ansgar Burchardt writes:
> debootstrap should support archives that only provide Packages.xz.
>
> I'll try to take a look at implementing this soon.  From a quick glance
> it shouldn't be too difficult given several compression formats are
> already supported (bz2, gz, uncompressed).

I've prepared a patch for this[1].  It worked for me with both a
Packages.xz suite (stretch) and one only providing Package.bz2, but not
.xz (squeeze).

Ansgar

  [1] https://github.com/aburch/debootstrap/commit/1689d645aacb0bc3f9edb86526f67e776469942a