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% Version Control Systems

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% Author: FOSSEE 

% Copyright (c) 2009, FOSSEE, IIT Bombay

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% Title page

\title[Version Control Systems]{SEES: Version Control Systems}

\author[FOSSEE] {FOSSEE}

\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}

\date[]{}

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    \frametitle{Outline}

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% DOCUMENT STARTS

\begin{document}

\begin{frame}

  \maketitle

\end{frame}

% CREATING TOC 

\begin{frame}

  \frametitle{Outline}

  \tableofcontents

  % You might wish to add the option [pausesections]

\end{frame}

%% There are some %$ used just to minimise the effect of $ sign used in lstlisting. In emacs it looks unhealthy.

% Introduction to course-need of version control, history, options available.

\section{Introduction}

\begin{frame}

  \frametitle{What is Version Control?}

  \begin{block}{From a blog post}

    ``Version control (or source control) is nothing more arcane than keeping copies of ones work as one make changes to it.''

  \end{block}

  \pause

  \begin{block}{}

    It is better to use these tools rather then wasting creativity to invent VCS which have files with names like \begin{color}{red}{prog1.py, prog2.py}\end{color} or \begin{color}{red}prog-old.py, prog.py.\end{color}

  \end{block}

\end{frame}

\begin{frame}

  \frametitle{Motivation behind such tools}

  \begin{itemize}

  \item Track the history and evolution of a program.

  \item To collaborate effectively on a project.

  \item \begin{color}{red}``To err is Human''\end{color} \pause for recovery we have ``Version Control''

  \end{itemize}

\end{frame}

\begin{frame}

  \frametitle{How is done What is done?}

  \begin{itemize}

  \item It keeps track of changes you make to a file. You can improvise, revisit, and amend.

  \item All procedure is logged/recorded, so you and others can follow the development cycle.

  \end{itemize}  

\end{frame}

\begin{frame}

  \frametitle{Do we really need this?}

  \emphbar{For team of people working remotely(even different computers/machines) on a project, use of version control is inevitable!}

  \vspace{0.15in}

  \emphbar{For single person: managing projects and assignments becomes easy}

  \vspace{0.15in}

  \pause

\end{frame}

\begin{frame}

  \frametitle{Whats on the menu!}

  \begin{itemize}

  \item cvs (Concurrent Version System)

  \item svn (Subversion)

  \item hg (Mercurial)

  \item bzr (Bazaar)

  \item git

  \end{itemize}

  \inctime{10}

\end{frame}

% Introduction to jargons 

\section{Learning the Lingo!}

\begin{frame}

  \frametitle{Common jargons: Basic setup}

  \begin{itemize}

  \item Repository(repo):\\

        The folder with all files.

  \item Server:\\

        Machine with main inventory/repo.

  \item Client:\\

        Local machines with copy of main repo.

  \end{itemize}

\end{frame}

\begin{frame}

  \frametitle{Actions}

  \begin{itemize}

  \item Add:\\

    Adding file into the repo for the first time.

  \item Version:\\

    Version number of a file.

  \item Head/Tip:\\

    The latest revision of the repo.

  \item Check out/Clone:\\

    Initial download of repo onto machine.

  \item Commit:\\

    Recording a change.

  \item Change log/History:\\

    List of changes made to repo.

  \end{itemize}

\end{frame}

\begin{frame}

  \frametitle{Actions cont...}

  \begin{itemize}

  \item Branch:\\

    Separate local copy of repo for bug fixing, testing.

  \item Diff/Change:\\

    Finding the differences in a file in two versions.

  \item Merge (or patch):\\

    Apply the changes to file, to make it up-to-date.

  \item Conflict:\\

    When merging a file is not obvious.

  \item Resolve:\\

    Fixing the conflict manually.

  \end{itemize}

\end{frame}

% Types of Version Controls

\section{Types of VCS}

\begin{frame}

  \frametitle{Types:}

  Based on way of managing the repo there are two types of VCS:

  \begin{itemize}

  \item Centralized VCS\\

    cvs, svn falls under this category.

  \item Distributed VCS\\

    hg, bzr, git follows this methodology.

  \end{itemize}

  \emphbar{We would be covering \typ{hg}}

\end{frame}

\begin{frame}

  \frametitle{Why hg?}

    \includegraphics[height=.75in, interpolate=true]{mercurial}

  \begin{itemize}

  \item Easy to learn and use.

  \item Lightweight.

  \item Scales excellently.

  \item Based on Python.

  \end{itemize}

  \inctime{10}

\end{frame}

% Initializing the repo, cloning, committing changes, pushing, pulling to repo.

\section{Getting Started}

\begin{frame}[fragile]

  \frametitle{Getting comfortable:}

  \begin{lstlisting}

    $ hg version    

    $ hg help

    $ hg help diff

  \end{lstlisting} %$

\end{frame}

\begin{frame}[fragile]

  \begin{lstlisting}

  localCopyhello

  \end{lstlisting}

  And we get a local copy of this repository. 

  \begin{lstlisting}

$ ls localCopyhello/

hello.c  Makefile

  \end{lstlisting}

\end{frame}

\begin{frame}[fragile]

  \begin{lstlisting}

$ mkdir Fevicol

$ cd Fevicol/

$ echo "print 'Yeh Fevicol ka majboot 

              jod hai'" > feviStick.py

$ ls -a

.  ..  feviStick.py

$ hg init

$ ls -a

.  ..  feviStick.py  .hg

  \end{lstlisting}

\end{frame}

\begin{frame}[fragile]

  \begin{lstlisting}

$ hg clone localCopyhello newCopy

updating working directory

2 files updated, 0 files merged, 

0 files removed, 0 files unresolved

  \end{lstlisting}

  or

  \begin{lstlisting}

$ hg clone Fevicol Fevicol-pull

updating working directory

0 files updated, 0 files merged, 

0 files removed, 0 files unresolved

  \end{lstlisting}

  \inctime{15}

\end{frame}

\begin{frame}[fragile]

  \begin{lstlisting}

$ cd localCopyhello

$ hg log    

  \end{lstlisting}

  \begin{itemize}

  \end{itemize}

\end{frame}

\begin{frame}[fragile]

  \frametitle{History/Logs cont...}

\begin{lstlisting}

\end{lstlisting}

\end{frame}

\begin{frame}[fragile]

  \begin{lstlisting}

$ cd Fevicol

$ hg log

$ hg st

? feviStick.py

  \begin{lstlisting}

$ hg add feviStick.py

$ hg st

A feviStick.py

  \end{lstlisting}

\end{frame}

\begin{frame}[fragile]

  \begin{lstlisting}

$ hg ci -u "Shantanu <shantanu@fossee.in>" 

        -m "First commit."

$ hg log

changeset:   0:84f5e91f4de1

tag:         tip

user:        Shantanu <shantanu@fossee.in>

date:        Fri Aug 21 23:37:13 2009 +0530

summary:     First commit.    

  \end{lstlisting}

\end{frame}

\begin{frame}[fragile]

  \frametitle{More basic operations}

  \begin{lstlisting}

$ hg cp feviStick.py pidiLite.py

$ hg rename pidiLite.py feviCol.py

$ hg st

A feviCol.py

$ hg ci -u "Shantanu <shantanu@fossee.in>" 

        -m "Added feviCol.py."

$ hg tip| grep summary 

summary:     Renamed feviStick.py.

  \end{lstlisting} %$

%% Other commands which can be handy are \typ{cp}, \typ{remove}, \typ{revert} etc.

  \inctime{10}

\end{frame}

% Introduction to concepts of branches, merging patch?

\section{Sharing and Collaborating}

\begin{frame}[fragile]

  \frametitle{Distributing changes}

  As this repo is self-contained, hence changeset just created are local and are not propagated to previously cloned Fevicol-pull.

  \begin{lstlisting}

$ hg pull 

pulling from /home/baali/Fevicol

requesting all changes

adding changesets

adding manifests

adding file changes

added 2 changesets with 2 changes to 2 files

(run 'hg update' to get a working copy)

  \end{lstlisting} %$

\end{frame}

\begin{frame}[fragile]

  \frametitle{Pulling changesets cont...}

  As pointed by previous command output, hg \typ{pull} does not(by default) update current directory. It just imports changesets. To add all these changesets one have to update using \typ{up} command:

  \begin{lstlisting}

$ cd Fevicol-pull

$ ls -a

.  ..  .hg

$ hg up

2 files updated, 0 files merged, 

0 files removed, 0 files unresolved

$ ls -a

.  ..  feviCol.py  feviStick.py  .hg    

  \end{lstlisting}

\end{frame}

\begin{frame}[fragile]

  \frametitle{Making changes across the repos}

  \begin{lstlisting}

$ Fevicol-clone/

  \end{lstlisting} %$

  Lets edit and correct the feviStick.py 

\begin{lstlisting}

$ echo "print 'Ab no more Chip Chip'" 

        > feviStick.py

$ hg st

M feviStick.py

\end{lstlisting}

  'M' sign indicates that Mercurial has noticed change.\\

\end{frame}

\begin{frame}[fragile]

  \frametitle{Revisiting changes}

To revisit changes made earlier use \typ{diff} command:

\begin{lstlisting}

$ hg diff

diff -r a7912d45f47c feviStick.py

--- a/feviStick.py   Sun Aug 23 22:34:35 2009 +0530

+++ b/feviStick.py   Sun Aug 23 22:47:49 2009 +0530

@@ -1,1 +1,1 @@

-print 'Yeh Fevicol ka Majboot jod hai'

+print 'Ab no more Chip Chip'

  \end{lstlisting} %$

  These changes are not logged until you commit them.\\

  \begin{lstlisting}