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% Version Control Systems
%
% Author: FOSSEE 
% Copyright (c) 2009, FOSSEE, IIT Bombay
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% DOCUMENT STARTS
\begin{document}

\begin{frame}

\begin{center}
\vspace{12pt}
\textcolor{blue}{\huge Version Control with hg}
\end{center}
\vspace{18pt}
\begin{center}
\vspace{10pt}
\includegraphics[scale=0.95]{../images/fossee-logo.png}\\
\vspace{5pt}
\scriptsize Developed by FOSSEE Team, IIT-Bombay. \\ 
\scriptsize Funded by National Mission on Education through ICT\\
\scriptsize  MHRD,Govt. of India\\
\includegraphics[scale=0.30]{../images/iitb-logo.jpg}\\
\end{center}
\end{frame}

\begin{frame}
  \frametitle{Objectives}
\label{sec-2}
  At the end of this session, you will be able to:
  \begin{itemize}
  \item Learn how to view and revert changes made to files in a repository.
  \item Learn how to share repositories and deal with simultaneous conflicting changes.
  \end{itemize}
\end{frame}

\begin{frame}
\frametitle{Pre-requisite}
\label{sec-3}


Spoken tutorial on -
\begin{itemize}
\item 
\end{itemize}
\end{frame}

\begin{frame}
  \frametitle{Operational overhead?}
  \begin{itemize}
  \item But why do we \typ{commit}?
  \item Isn't all this just adding to operational costs?
  \item Isn't all this a waste of time?
  \end{itemize}
  \begin{center}
    \emphbar{No! You shall see the benefits, soon!}    
  \end{center}
\end{frame}

\begin{frame}
  \frametitle{Revert Changes}
  \begin{itemize}
  \item Undo all changes; the editor can only do so much.
  \item \typ{hg revert --all}
  \item \typ{hg revert filename}
  \item Present file, with changes --- \typ{filename.orig}
  \end{itemize}
\end{frame}

\begin{frame}[fragile]
  \frametitle{Viewing Changes}
  \begin{itemize}
  \item \typ{hg diff} --- all changes since last commit
  \end{itemize}
  \begin{block}{}
    \begin{lstlisting}
      - this line was deleted
      + this line was added
    \end{lstlisting}
  \end{block}
\end{frame}


\begin{frame}[fragile]
  \frametitle{Revision numbering}
  \begin{itemize}
  \item \typ{changeset:   n:cbf6e2a375b4}
  \item \typ{n} is the revision number
  \item The revision number is local to a repository
  \item \typ{cbf6e2a375b4} is the unique identifier
  \end{itemize}
\end{frame}

\begin{frame}[fragile]
  \frametitle{Using revision numbers}
  \begin{itemize}
  \item \typ{-r n} can be passed as arguments to commands to specify
    the revision number
  \item For instance, \typ{hg diff -r1 -r2}
  \item \typ{m:n} specifies a range of revision numbers
  \item For instance, \typ{hg log -r0:2}
  \end{itemize}
\end{frame}

\section{Collaborating with Mercurial}
\begin{frame}[fragile]
  \frametitle{Cloning Repositories}
  \begin{itemize}
  \item \typ{hg clone SOURCE [DEST]}
  \item All \typ{hg} repositories are self-contained
  \end{itemize}
\end{frame}

\begin{frame}[fragile]
  \frametitle{Sharing Repositories}
  \begin{itemize}
  \item \typ{hg serve}
  \item Can be cloned with \typ{hg clone http://my-ip-address:8000}
  \item We share a central repository; work on our local copies. 
  \item Set write permissions in \typ{.hg/hgrc}
  \end{itemize}
  \begin{lstlisting}
    [web]
    push_ssl=False
    allow_push=*
  \end{lstlisting}
\end{frame}

\begin{frame}
  \frametitle{Sharing Changes}
  \begin{itemize}
  \item Use \typ{hg push} to push your \typ{commits}
    (\typ{changesets}) to the central repository
  \end{itemize}
\end{frame}


\begin{frame}
  \frametitle{Pulling Changes}
  \begin{itemize}
  \item \typ{hg incoming} shows new \typ{changesets} in the server 
  \item To get these \typ{changesets}, we use \typ{hg pull}
  \item These changes do not affect our working directory
  \item \typ{hg parent} shows the parents of the working directory
  \end{itemize}
\end{frame}

\begin{frame}
  \frametitle{Pulling Changes \ldots}
  \begin{itemize}
  \item \typ{hg update} will update the working directory 
    \begin{itemize}
    \item Updates to the \typ{tip} if no revision is specified
    \item \typ{tip} is the most recently added changeset 
    \item Can specify revision number to update to
    \end{itemize}
  \item \typ{hg tip} shows the \typ{tip} of the repository
  \end{itemize}
\end{frame}

\begin{frame}
  \frametitle{Simultaneous Changes}
  \begin{itemize}
  \item The logs of both repositories will be different
  \item The repositories have diverged
  \item \typ{hg push} fails, in such a scenario
  \item \alert{Never, Never, Never, Ever} use \typ{hg push -f}
  \end{itemize}
\end{frame}

\begin{frame}
  \frametitle{Merging}
  \begin{itemize}
  \item Pull and merge, when \typ{abort: push creates new remote
    heads!}
  \item \typ{hg merge} will merge the two diverged heads
  \item \typ{commit} after you have \typ{merged}!
  \end{itemize}
\end{frame}

\begin{frame}
  \frametitle{Simultaneous Changes \ldots}
  \begin{itemize}
  \item \typ{outgoing} shows the \typ{changesets} that will be pushed
  \item \typ{hg push} works!
  \item Look at the `Change graph'!
  \end{itemize}
\end{frame}

\begin{frame}
  \frametitle{Simultaneous Conflicting Changes}
  \begin{itemize}
  \item What if the changes conflict? -- overlapping edits
  \item \typ{hg push} fails; \typ{hg pull}; \typ{hg merge}
  \item You now get a diff view with 3 panes 
    \begin{itemize}
    \item First --- current file
    \item Second --- \typ{changesets} that you pulled
    \item Third --- file before you made your changes
    \end{itemize}
  \item Resolve conflict and save
  \item \typ{hg commit}; \typ{hg push}
  \item Look at the `Change graph'!
  \end{itemize}
\end{frame}

\section{Conclusion}

\begin{frame}
  \frametitle{\alert{Advice}: Work-flow}
  General work-flow
  \begin{itemize}
  \item \typ{pull}; \typ{update}
  \item Make changes
  \item \typ{commit}
  \item If changes on repo, \typ{pull} and \typ{merge}
  \item \typ{push}
  \end{itemize}
  \emphbar{Commit Early, Commit Often}
\end{frame}

\begin{frame}
\frametitle{Summary}
\label{sec-18}

In this tutorial, we have learnt to,

\begin{itemize}
\item Undo changes to the repository using hg revert,
\item View changes done to the repository using hg diff
\item Use revision numbers as arguments to different hg commands
\item Clone repositories, using hg clone,
\item Serve our repositories via http using hg serve,
\item push changes to a repository using hg push,
\item check the changesets in a repository after last pull, using hg incoming,
\item pull changes from a repository using hg pull ,
\item update the working directory, using hg update,
\item merge two heads, using hg merge,
\item and resolve conflicts using hg resolve.
\end{itemize}
\end{frame}
\begin{frame}[fragile]
\frametitle{Evaluation}
\label{sec-19}


\begin{enumerate}
\item 
\item 
\item 
\end{enumerate}
\end{frame}
\begin{frame}
\frametitle{Solutions}
\label{sec-20}


\begin{enumerate}
\item 
\vspace{15pt}
\item 
\end{enumerate}
\end{frame}
\begin{frame}


\begin{block}{}
  \begin{center}
  \textcolor{blue}{\Large THANK YOU!} 
  \end{center}
  \end{block}
\begin{block}{}
  \begin{center}
    For more Information, visit our website\\
    \url{http://fossee.in/}
  \end{center}  
  \end{block}
\end{frame}

\end{document}

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