Clear case

ClearCaseSoftware version control system

Having a Software configuration Management Tool is very importantin the field of software development

I will Talk about,

Source Control in general

List of existing Source Version Control Software

Version Control with ClearCase

Summary

1

Source Control main line

2

3

0versions

Luba’s workspace

a_file.c

check out

check in

List of existing Source Version Control Software

* There are a lot of them !*

http://www.iac.honeywell.com/Pub/Tech/CM/CMTools.html#CMWWWsites

ClearCase - Windows and UNIX Visual SourceSafe - Windows CVS - UNIX CMVision - Unix and Windows Control CS - Unix and Windows the list goes on …

What is ClearCase?

ClearCase is a comprehensive

software version control and

configuration management system,

designed for development teams

working in a local network.

ClearCase Overview Provides versioning of all types of files

& directories Records and reports history Guarantees accurate reproduction of

every release Provides traceability & reproducibility Provides powerful branch-and-merge

tools Assures integrity of all software

elements


Branching Merging Labeling

1


\main

2

3

0VERSIONS

- Versions all file types- Versions directories- Files are read-only until checked out- Unlimited branching and merging

14

2

0

5

BRANCHLABELS

Beta_01

Rls1.0

Rls2.0\Rls2_bugfix

Rls3.0

ClearCase Version Control Features

Easy checkout-edit-checkin model Intelligent merge utility automatically merges non-

conflicting changes Graphical compare and merge tools Two modes of work with Dynamic and Snapshot

Views

Workspace Management - Views

WHAT IS A VIEW? Workspace for an individual developer or closely

coordinated group Selects versions of Versioned Object Base (VOB)

directories and files Allows developers to work without interfering with

others

What is a VOB?Versioned Object Base

A read-only repository of ClearCase elements A network-wide, file system resource which

stores version-controlled data A user accesible repository that resides:

on a Windows NT system, or on a UNIX system

Version Selection by Views

A view selects versions of elements What is seen is the result of an ordered

set of rules called a configuration specification

(config spec). Selected versions appear in a standard

directory tree with recognizable file names.

load \applet\src

element * CHECKEDOUT

element * \main\LATEST

VOB

src

foo.c bar.c

foo.c src bar.c

VIEW

config spec

What is a Configuration Specification?

Each view has a config spec that defines a set of rules for selecting versions of file and directory elements

A default config spec is automatically set whenever you create a new view

The default config spec selects files or directories that are: checked out, or the latest version on the main branch of the version

tree

The Default Config Spec:


element * \main\LATEST

Workspace Management - Views Dynamic Views Snapshot Views

Snapshot Views Downloads files based on Rules Allows work while disconnected

from the net Optimal build performance

for prototype or test builds

load \applet\src


element * \

Snapshot View

VOB

CLIENT

src

foo.c bar.c

foo.c src bar.c

When To Use Snapshot Views

You want to work with source files that are under ClearCase control while disconnected from network

You prefer to use a view that is updated only at your request

You want to access a view from a machine that is not a ClearCase host

Dynamic Views

Transparent access to elements- a virtual filesystem

Always up-to-date Minimal copying Provides build auditing

Snapshot View vs. Dynamic View

Similar

use config specs rules to select element versions follow the checkout, edit, checkin paradigm allow reserved or unreserved checkouts

Differ as development progress, a snapshot view becomes

out of date and must be explicitly updated a checkout of an element may use the version

loaded into the view, not necessarily the latest version in the VOB to check in such an element, you may have to

perform a merge if the element version is not the latest version, you are

asked to confirm which version to checkout

Snapshot View vs. Dynamic View

20 minutes is NOT enough to cover everything. If you are interested in learning more about ClearCase, here is the web site:

http://www.rational.com/index.jtmpl

If asked what the talk was about, these are the things you must remember, :) WE DISCUSSED: checkout-edit-checkin model Labeling Branching Merging Views Config Spec WE HAD A LOT OF FUN!!!

Design

Clear case