VIEWS: 4 PAGES: 23 POSTED ON: 9/30/2011
ClearCase Software version control system Having a Software configuration Management Tool is very important in 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 Source Control Luba’s workspace main line check out 0 a_file.c versions check in 1 2 3 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 Version Control with ClearCase Branching Merging Labeling Version Control with ClearCase - Versions all file types \main - Versions directories 0 VERSIONS - Files are read-only Beta_01 1 until checked out BRANCH - Unlimited branching LABELS Rls1.0 2 and merging \Rls2_bugfix Rls2.0 3 0 4 1 Rls3.0 5 2 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 Viewselements A view selects versions of What is seen is the result of an ordered VOB set of rules called a configuration specification foo.c src bar.c (config spec). config spec Selected versions appear in a standard directory tree with recognizable file names. src V load \applet\src I element * CHECKEDOUT foo.c bar.c E W element * \main\LATEST 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 * CHECKEDOUT element * \main\LATEST Workspace Management - Views Dynamic Views Snapshot Views Snapshot Views Downloads files based on Rules Allows work while disconnected VOB from the net foo.c src bar.c Optimal build performance for prototype or test builds Snapshot View load \applet\src src element * CHECKEDOUT foo.c bar.c element * \ CLIENT 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 Snapshot View vs. Dynamic View 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 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!!!
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