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udpkg is a much-trimmed down version of the Debian package manager. The
goal is to implement a small subset of dpkg's functionality sufficient
to bootstrap a newly installed system.
Assumptions:
* udpkg needs to provide support for the following operation modes of dpkg:
-i: install package(s)
-r: remove package(s)
--unpack: unpack packages
--configure: configure packages
* Full dependency checking is not supported. In particular, udpkg does not
support:
- Pre-depends
- Versioned depends
- Alternate depends (udpkg forces the first one to be used)
- Versioned provides (not currently in policy)
- Conflicts and replaces
Simple dependencies on either a real package or a virtual package is
supported.
* udpkg must be able to recognize and update the status file based on
packages being installed or removed
* dependency checking can be turned off completely at compile time to
save space
* udpkg depends on the availability of external tools; in particular, ar,
tar, zcat and the existence of /bin/sh.
(TODO: optionally link in busybox versions of these routines instead
of running them from the shell)
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