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Re: .deb format: let's use 0.939, zstd, drop bzip2

On Thu, May 09, 2019 at 09:22:56AM +0200, Ansgar wrote:
> Also dpkg keeps metadata in /var, but changelogs, NEWS, copyright
> documentation isn't variable state data and should be below /usr...  The
> same is really true for lists of files and maintainer scripts though.

It's a mess:

* Most of the control tarball (to be exact: every file other than "control")
  goes to /var/lib/dpkg/info/$PACKAGE.$FILENAME; they're all (I've verified
  across all .debs in Buster) plain files of either mode 644 or 755.
* Except for "control" which is sort of concatenated and dumped into
  /var/lib/dpkg/status, with "Status:" added.
* On the other hand, /var/lib/dpkg/info/$PACKAGE.list is generated from
  the list of files in the data tarball.

Knowing $PACKAGE requires reading the control tarball: if Multi-Arch is
"same" (and no other value), $PACKAGE is "Package:Architecture", "Package"

The data tarball is unpacked into the filesystem mostly as-is, but you still
need to obey diverts, replaces, and symlinks.


(I'm reverse-engineering dpkg instead of reading the specs on purpose: in
order to change the spec, what matters is current practice rather than the
letter of documentation, often written 25 years ago before we settled on a
subset of features.)
⣾⠁⢠⠒⠀⣿⡁ Did ya know that typing "test -j8" instead of "ctest -j8"
⢿⡄⠘⠷⠚⠋⠀ will make your testsuite pass much faster, and fix bugs?