Using Git with Rational Team Concert and Rational ClearCase in enterprise environments

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1 Using Git with Rational Team Concert and Rational ClearCase in enterprise environments Bartosz Chrabski Executive IT Specialist WW Competitive Sales Team Peter Hack ClearCase Architect

2 Open Source SCM market is changing Git is important Git is much faster than Subversion Git's repositories are much smaller than Subversions (for the Mozilla project, 30x smaller) Git was designed to be fully distributed from the start, allowing each developer to have full local control Git branches are simpler and less resource heavy than Subversion's Git branches carry their entire history Git provides better auditing of branch and merge events Backing up Subversion repositories centrally is potentially simpler - since you can choose to distributed folders within a repo in git Git repository clones act as full repository backups Subversion's UI is more mature than Git's

3 Why IBM loves GIT 2

4 Configuration management - Trends Version control system Control of Roles and Users 3

5 Configuration management - Trends Build tools Environment Configuration 4

6 Pressure on Software / Hardware Team Leaders Corporate Process! Security! Regulatory compliance! Developers Get out of my way! Performance! 5

7 What problems You need to solve with an SCM system Developers SCM just gets in the way Large undo buffer Parallel development Isolation Merging Performance Offline work Development Organization / Corporate Security Time machine Parallel development Isolation Large-scale merging Variant management Component structures 6

8 What problems You need to solve with an SCM system Corporate (continued) Distributed teams Traceability Project lifecycle Change tracking Build and release Process automation / enforcement Regulatory compliance External audits Classified development Hardware / Software codevelopment Management of large binary files Subcontracting Scalability Performance 7

9 Small deployments of SCM systems challenges Key challenges to solve by SCM system Easy to learn / use Limited parallel development Low admin overhead Lightweight process ALM integration Platform support (Windows Linux) Distributed team (maybe) One of the big problems, that is often ignored is, "What do we do if we're successful? Often, that's when choosing a low-end tool ends up being an unfortunate choice Planning for success can often pay off (i.e. choosing a more powerful tool than you "need"). 8

10 Git can be great for this situation Implicit backup Stores Snapshots not differences No need of powerful hardware Free and open source Fast and small It is fully distributed Anyone can have any/all versions/files from other repositories Everyone works on their own branch(es) No branch sharing (effectively, branches are "mastered" at one repo and mastership cannot be transferred to another) Access control is unimportant - it's open source Simple security model Although their data integrity validation provided by use of hashes is sometimes imprecisely referred to as "security" Entire repository copy for each workspace This can cause disk space challenges when multiple copies are needed for parallel development. Rebase operation can modify past history No process automation Support for sharing done by merging Branch owner "approves" of changes through act of merging 9

11 Medium to Enterprise deployments of SCM systems Challenges Security Source code security (Access control) Standards Ability to adapt to corporate standards Ability to store and manage binary files and high volumes of data Support exclusive checkout (locking files). Usability Usability for non-it users Simplicity that fits all Enterprise Scale Service Level Agreement or 24/7 support Backup and data recovery Scaling up Traceability with work items and other ALM artifacts 10

12 SDLC Environments are not built based on one vendor solutions Rational ClearCase

13 Challenges related to multi-vendors SDLC = REALITY 12

14 One size does not fit all Git IBM Rational Team Concert IBM Rational ClearCase It is fully distributed Anyone can have any/all versions/files from other repositories Everyone works on their own branch(es) No branch sharing (effectively, branches are "mastered" at one repo and mastership cannot be transferred to another) Access control is unimportant - it's open source Simple security model Although their data integrity validation provided by use of hashes is sometimes imprecisely referred to as "security" Entire repository copy for each workspace This can cause disk space challenges when multiple copies are needed for parallel development Rebase operation can modify past history. No process automation Support for sharing done by merging Branch owner "approves" of changes through act of merging Tuned for Agile Development Flexible Deployment solution Ability to work over the WAN with a centralized repository and file proxy caching Dashboard spawning multiple projects/repositories Advanced collaboration support In context, collaboration among software developers Agile development support Integrated, end to end, scalable support of Agile development processes such as Scaled Agile Framework Iteration planning and end to end business visibility Powerful source control management Integrated Build Management Supports incremental adoption with ClearCase, ClearQuest, Synergy, Change, Subversion, Git, etc Tuned for the Enterprise Broadest set of platform support in the industry Supports globally distributed development Flexible Deployment Solutions Optimized to work over the WAN with a centralized repository CC MultiSite for Distributed Repositories Private cloud or on premises deployment ClearCase Dynamic Views and Automatic Views for Instant-on access to assets Handles very large configurations & files Highly customizable and scalable UCM for out of the box process enactment ClearQuest ALM Schema Highly secure repositories and processes Business IT governance infrastructure: access control, electronic signatures, repeatable processes, audit trails and lifecycle traceability Extensible integration with CLM and other ALM solutions 13

15 Why different SCMs should work together? What is the cost to move off any SCM now? High migration costs and time Loss of history and metadata Expensive consulting and addtional education Any type of co-existance is actually cheaper than migration? Product delays, possible errors introduced to new releases - what are they making and what is the impact of a failed or delayed release? Reduced productivity as developers learn a new tool and build new integrations and automation Higher risk for current projects Lower productivity How much automation do they have with CC or current SCM today - i.e. builds - that need to be rebuilt with Git? How much effort is this? Possible loss of code history, will they be able to rebuild past releases if needed Loss of integrations to existing tools 14

16 Risk of migration between SCMs Any SCM system cannot be mapped 1:1 to Git (There is no magic tool) Always You need some type of workaround Be aware that there will be problems and not always working workarounds Files are compressed in memory (2 GB on 32-bit systems) Binary files increase the repo size Repository size vs. bandwidth Authentication / Protocol Security Access Control (ClearCase is OS-level permission scheme, Git has NO file-based Access Control) Be aware of: It is alway better to focus on co-existance and expansion of tool landscape to accomodate Open Source & Enterprise systems Try to focus on how IBM SCM tools enhance/improve their process & security together with existing tools is not an answer to all the issues related to SCM. It is not innovation, just new software, which is focused on developers. ClearCase or RTC can and should co-exist with other SCMs in the mature organization which is not ruled only by developers. 15

17 RTC Tracking & Planning as a change management hub RTC provides an out-of-the-box integration with Git Supports vanilla Git today, GitHub and GitHub Enterprise Compatible with other open source tools commonly used with Git Git with Gerrit for code review Git with Jenkins for build Provides governance: Users must authenticate with RTC in order to check in changes Provides and enforces linking between Git commits and RTC work items Grant permissions for who can commit changes, create/delete branches, etc. Teams get the benefits of RTC: Agile planning, workflow and approvals, etc. Teams using RTC SCM Teams using ClearCase Teams using Synergy Teams using Git 16

18 IBM Rational Team Concert Connecting GIT with ALM Rational Quality Manager Rational Team Concert Rational DOORS NG

19 GIT is missing some features use RTC to enrich it Protection of intellectual property Every developer has the complete code base on his or her laptop. Do companies really want to take that risk with their valuable source code? No fine-grained access control over directories or files within the code base. No control over data leaks. If something slips out, there's no way to find all the places it could be. Support for advanced development and strategic reuse Manage relationships between components, as needed for product line engineering Baselines contribute to Global Configurations for managing versions and variants across the lifecycle Manage all your development teams with RTC Some teams may need RTC SCM, and others may okay with Git that's fine. RTC can provide common CCB process, reports, metrics, and governance across all teams. Enterprise scale and support Git does not address enterprise level operational aspects. Qualities of service like high availability or replication of multiple repositories have to be done leveraging additional tools. As any other open source system Git does not have proper support. Any enterprise system must offer a piece of mind in addition to technical qualities.? Tight integration with IBM's Application Lifecycle Management solution for full traceability 18

20 Why even consider IBM ClearCase and GIT working together Customization & integrations Highly customizable and controllable SCM process support to fit many different modes of development including Agile, Waterfall, and custom ClearCase integrates with many other software development and delivery tools within Rational as well as outside of IBM Rational ClearCase and IBM Rational provide greater ALM flexibility rather than only addressing one piece of the puzzle (SCM) Lower risk allowing to use ClearCase as well as explore alternatives for those that are looking for something different, possibly IBM Rational Team Concert ClearCase provides a sound platform for SCM with managed security, configuration management, runtime environment (WAS) and integration ecosystem (including Jazz and Open Source) Enterprise scale and support IBM Rational provides 24x7 support for ClearCase and its maturity on the market makes it a reliable SCM solution Flexiblity ClearCase supports Deltas as a storage method but is far more flexible. Out of the box, we provide deltas, compression, and uncompressed storage options on an element by element basis CC provides 4 different types of views depending on the needs of the developer and/or task. No other product provide this degree of flexibility. Extensive suite of GUIs as well as a comprehensive command line. Flexible security model, including access control down to the individual file level, if needed. 19

21 ClearCase is HERE to secure Your GIT deployments Authentication CCRC requires explicit authentication Authorization Fine-grained access control Access Control Lists (ACLs) Unix-style permissions Auditing Detailed change history Fine-grained build auditing Access violation logging Encryption Data in motion: CCRC supports https Data at rest: Disk encryption "How a bug in Visual Studio 2015 exposed my source code on GitHub and cost me $6,500 in a few hours"

22 Customer Case Git challenges mitigated with IBM CC Situation: Large development team doing extensive parallel development Challenges and ClearCase solutions: Parallel development causing massive data duplication Dynamic and automatic views avoid needless duplication Parallel development causing massive redundant builds Winkin and binary file management avoid redundant builds Must introduce fine-grained access control Access Control Lists (ACLs) Automate processes to prevent accidental (or intentional) mistakes Triggers and metadata help developers 21

23 Q&A 22

24 Thank You Your Feedback is Important! Access the InterConnect 2016 Conference Attendee Portal to complete your session surveys from your smartphone, laptop or conference kiosk.

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