rlm@1: The point of this system to to 
rlm@1: 
rlm@1: 1. Determine the provenence of every file on my system.
rlm@1: 2. Always have an "undo" button.
rlm@1: 
rlm@1: These criteria have evolved from my frustrations
rlm@1: with my previous LFS system.
rlm@1: 
rlm@1: 
rlm@1: User expreience:
rlm@1: 
rlm@1: Suppose I want to install emacs.
rlm@1: 
rlm@1: here's a sample terminal session
rlm@1: 
rlm@1: $ pkg emacs "a text editor"
rlm@1:    > creating user emacs.
rlm@1:    > cd /pkg/emacs
rlm@1: 
rlm@1: $ wget http://emacs.com/emacs.tar.bz2
rlm@1:    > downloaded emacs.tar.bz2
rlm@1:    
rlm@1: $ unp emacs.tar.bz2; cd emacs; configure; 
rlm@1:      make install;
rlm@1:    > install stuff.. 
rlm@1:    
rlm@1: $ hg st
rlm@1:    > a bunch of files are added
rlm@1: 
rlm@1: 1. Say I don't want emacs after all.
rlm@1: $ hg purge; hg revert --all
rlm@1: 
rlm@1: 2. Complete emacs instilation
rlm@1:    > hg addr; hg commit -m "emacs." 
rlm@1: 
rlm@1: (this commits as the emacs user)
rlm@1: 
rlm@1: 3. can examine provenance of information
rlm@1: $ pkg-examine emacs
rlm@1:    > package emacs owns the following files:
rlm@1:    >  emacs
rlm@1:    >  man/emacs 
rlm@1:    > ....
rlm@1: 
rlm@1: 4. see all the commits that the "emacs" user made.
rlm@1: $ pkg-history emacs
rlm@1:   > <filtered mercurial log>
rlm@1: 
rlm@1: 5. remove a package in its entirety
rlm@1: $ pkg-remove emacs
rlm@1:   > removed
rlm@1:   > <list of files>
rlm@1:  
rlm@1: 
rlm@1: 
rlm@1: