1.1 --- a/en/00book.tex	Tue Oct 24 11:25:56 2006 -0700
     1.2 +++ b/en/00book.tex	Thu Nov 09 10:11:31 2006 -0800
     1.3 @@ -37,9 +37,9 @@
     1.4  
     1.5  \include{preface}
     1.6  \include{intro}
     1.7 -%\include{concepts}
     1.8  \include{tour-basic}
     1.9  \include{tour-merge}
    1.10 +\include{concepts}
    1.11  \include{daily}
    1.12  \include{hook}
    1.13  \include{template}

     2.1 --- a/en/Makefile	Tue Oct 24 11:25:56 2006 -0700
     2.2 +++ b/en/Makefile	Thu Nov 09 10:11:31 2006 -0800
     2.3 @@ -21,6 +21,7 @@
     2.4  	tour-merge.tex
     2.5  
     2.6  image-sources := \
     2.7 +	filelog.svg \
     2.8  	kdiff3.png \
     2.9  	mq-stack.svg \
    2.10  	tour-history.svg \

     3.1 --- a/en/concepts.tex	Tue Oct 24 11:25:56 2006 -0700
     3.2 +++ b/en/concepts.tex	Thu Nov 09 10:11:31 2006 -0800
     3.3 @@ -1,131 +1,38 @@
     3.4 -\chapter{Basic Concepts}
     3.5 +\chapter{Behind the scenes}
     3.6  \label{chap:concepts}
     3.7  
     3.8 -This chapter introduces some of the basic concepts behind distributed
     3.9 -version control systems such as Mercurial.
    3.10 +Unlike many revision control systems, the concepts upon which
    3.11 +Mercurial is built are simple enough that it's easy to understand how
    3.12 +the software really works.  Knowing this certainly isn't necessary,
    3.13 +but I find it useful to have a ``mental model'' of what's going on.
    3.14  
    3.15 -\section{Repository}
    3.16 -\label{sec:concepts:repo}
    3.17 -The repository is a directory where Mercurial stores the history for the
    3.18 -files under revision control.
    3.19 +\section{Tracking the history of a single file}
    3.20  
    3.21 -\subsection{Where?}
    3.22 -% where is this repository you speak of?
    3.23 -XXX
    3.24 +When Mercurial tracks modifications to a file, it stores the history
    3.25 +of that file in a metadata object called a \emph{filelog}.  Each entry
    3.26 +in the filelog contains enough information to reconstruct one revision
    3.27 +of the file that is being tracked.  Filelogs are stored as files in
    3.28 +the \sdirname{.hg/data} directory.  A filelog contains two kinds of
    3.29 +information: revision data, and an index to help Mercurial to find a
    3.30 +revision efficiently.  
    3.31  
    3.32 -\subsection{How?}
    3.33 -% How are the changes stored?
    3.34 -XXX
    3.35 -
    3.36 -\subsection{Structure}
    3.37 -\label{sec:concepts:structure}
    3.38 -% What's the structure of the repository?
    3.39 -A typical Mercurial repository is a directory which contains a checked out
    3.40 -working copy (see section~\ref{sec:concepts:workingcopy}) as well as
    3.41 -\sdirname{.hg} directory.  Figure~\ref{ex:concepts:dirlist} shows the
    3.42 -contents of a freshly created repository.  This repository does not contain
    3.43 -any revisions. Let's take a look at a repository that has history for
    3.44 -several files.
    3.45 -Figure~\ref{ex:concepts:dirlist2} shows the contents of a repository keeping
    3.46 -history on two files.  We see the checked out copies of the files
    3.47 -\filename{foo} and \filename{bar}, as well as the files containing their
    3.48 -histories \filename{foo.i} and \filename{bar.i}, respectively. Additionally,
    3.49 -we see the \filename{changelog.i} and \filename{00manifest.i} files. These
    3.50 -contain the repository-wide revision data, such as the commit message, and
    3.51 -the list of files in the repository during the commit.
    3.52 +For small files without much history, the revision data and index are
    3.53 +combined in a single file (with a ``\texttt{.i}'' suffix).  A file
    3.54 +that is large, or has a lot of history, has its filelog stored as
    3.55 +separate data (``\texttt{.d}'' suffix) and index (``\texttt{.i}''
    3.56 +suffix) files.  The correspondence between a file in the working
    3.57 +directory and the filelog that tracks its history in the repository is
    3.58 +illustrated in figure~\ref{fig:concepts:filelog}.
    3.59  
    3.60  \begin{figure}[ht]
    3.61 -  \interaction{concepts.dirlist}
    3.62 -  \caption{Contents of a freshly created repository}
    3.63 -  \label{ex:concepts:dirlist}
    3.64 +  \centering
    3.65 +  \grafix{filelog}
    3.66 +  \caption{Relationships between files in working directory and
    3.67 +    filelogs in repository}
    3.68 +  \label{fig:concepts:filelog}
    3.69  \end{figure}
    3.70  
    3.71 -\begin{figure}[ht]
    3.72 -  \interaction{concepts.dirlist2}
    3.73 -  \caption{Contents of a repository tracking two files}
    3.74 -  \label{ex:concepts:dirlist2}
    3.75 -\end{figure}
    3.76 -
    3.77 -\subsection{hgrc}
    3.78 -% .hg/hgrc
    3.79 -XXX
    3.80 -
    3.81 -\subsection{Creating a Repository}
    3.82 -% hg init
    3.83 -Creating a repository is quick and painless.  One uses the \hgcmd{init}
    3.84 -command as figure~\ref{ex:concepts:hginit} demonstrates.  The one argument
    3.85 -passed to the \hgcmd{init} command is the name of the repository. The name
    3.86 -can be any string usable as a directory name.
    3.87 -
    3.88 -\begin{caution}
    3.89 -If you do not specify a name of the repository, the current working
    3.90 -directory will be used instead.
    3.91 -\end{caution}
    3.92 -
    3.93 -\begin{figure}[ht]
    3.94 -  \interaction{concepts.hginit}
    3.95 -  \caption{Creating a new repository}
    3.96 -  \label{ex:concepts:hginit}
    3.97 -\end{figure}
    3.98 -
    3.99 -\subsection{Remote Repositories}
   3.100 -\label{sec:concepts:remoterepo}
   3.101 -In addition to repositories stored on the local file system, Mercurial
   3.102 -supports so called \emph{remote repositories}.  These remote repositories
   3.103 -can be accessed via several different methods.  See
   3.104 -section~\ref{sec:XXX:remotesetup} for instructions how to set up remote
   3.105 -repositories.
   3.106 -% XXX: reference the proper section!
   3.107 -
   3.108 -\subsubsection{SSH}
   3.109 -\label{sec:concepts:remoterepo:ssh}
   3.110 -Mercurial can use \command{ssh} to send and receive changes. The remote
   3.111 -repository is identified by an URL. The basic format for the URL is:
   3.112 -
   3.113 -\begin{verbatim}
   3.114 -ssh://[user@]host/path
   3.115 -\end{verbatim}
   3.116 -
   3.117 -Where \cmdargs{user} is optional, and the \cmdargs{path} is path to the
   3.118 -repository --- either an absolute or relative to the user's home directory
   3.119 ---- on the remote host with hostname: \cmdargs{host}.
   3.120 -
   3.121 -\begin{note}
   3.122 -If the path for the remote repository is absolute there will be two
   3.123 -consecutive slashes.  E.g., if the remote path is \dirname{/repos/hgbook},
   3.124 -the URL would look something like the following:
   3.125 -
   3.126 -\begin{verbatim}
   3.127 -ssh://someuser@remotebox//repos/hgbook
   3.128 -\end{verbatim}
   3.129 -
   3.130 -Relative paths have only one slash and are relative to the user's home
   3.131 -directory.
   3.132 -\end{note}
   3.133 -
   3.134 -\subsubsection{HTTP \& HTTPS}
   3.135 -\label{sec:concepts:remoterepo:http}
   3.136 -The other protocol supported is HTTP as well as HTTPS.  The repository URL
   3.137 -is very much like that of the \command{ssh}.
   3.138 -
   3.139 -\begin{verbatim}
   3.140 -http://[user@]remotebox/path
   3.141 -\end{verbatim}
   3.142 -
   3.143 -Just as before, the username is optional.
   3.144 -% XXX: is it optional for both push & pull or just for pull?
   3.145 -This time however, the path is relative to the HTTP server root.  
   3.146 -
   3.147 -\section{Working Copy}
   3.148 -\label{sec:concepts:workingcopy}
   3.149 -XXX
   3.150 -
   3.151 -\section{Revisions}
   3.152 -\label{sec:concepts:revs}
   3.153 -XXX
   3.154 -
   3.155  %%% Local Variables: 
   3.156  %%% mode: latex
   3.157  %%% TeX-master: "00book"
   3.158  %%% End:
   3.159 -

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