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Enhancing Version Control for Efficient Code Migration Processes

Explore a comprehensive guide on integrating version control and code migration, with tips on using CVS, tags, and scripts in real-world scenarios to enhance the code migration process. Learn about the significance of Ant for smoother workflow. Discover how this approach can benefit your development projects.

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Enhancing Version Control for Efficient Code Migration Processes

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  1. Integration of Version Control and Code Migration ProcessesChapter 2 – from Make to Ant JA-SIG - December 5, 2005 - Austin, TX Jim Thompson Division of Information Technology University of Wisconsin – Madison https://mywebspace.wisc.edu/jfthomps/vc

  2. University of Wisconsin - Madison • public land-grant university (est. 1848) • home of the Badgers • Big Ten conference (11 with Penn State) • over 40,000 students • consistently among top 5 in USA for research funds • #1 large school for Peace Corps volunteers • Madison is the capital of Wisconsin JA-SIG 12/5/2005

  3. My work group • part of Division of Information Technology • we design, build, acquire, install and support Internet infrastructure applications (a.k.a. upper middleware) • E-mail • Calendar • My WebSpace (see http://www.educause.edu/apps/eq/eqm05/eqm0548.asp) • Portal JA-SIG 12/5/2005

  4. Today’s presentation • Review major features from “Chapter 1” • Some background info about current portal • How we use CVS, tags and scripts • How tags and scripts work with our portal • Enhancements for our new portal • Tags and migration of uPortal frameworks • Ant, more new tags and reports • Maybe some of this can work for you JA-SIG 12/5/2005

  5. My UW-Madison (our portal) • http://my.wisc.edu provides access to • E-mail • Calendar • My WebSpace • Application status and Enrollment • Financial Aid • Classes on the web (Learn@UW) • Course Resources • Grades (entry and review) • Guest Accounts (demo Annie Student & Andi Advisor) JA-SIG 12/5/2005

  6. Some My UW-Madison statistics • September 2003 – over 1.3 million logins • Over a million logins/month thru May 2004 • September 2004 (new usage records) • Over 1.85 million logins by 49,900+ users • September 2, 2004 (first day of instruction) • 85,739 logins by 29,676 users • About 6,000 users during lunch hour • September 2005 (new UW home page) • Over 1.5 million logins by 51,000+ users JA-SIG 12/5/2005

  7. My UW–Madison - some lingo • MUM = My UW–Madison • MUMMI = module inventory • MUMMR = migration request • MUMsters = developers • mumdev = development/test box (Solaris) • mumweb1,2 = web servers (Linux) • mumapp3,4 = app servers (Solaris) • New servers are named after mummies JA-SIG 12/5/2005

  8. MUM Service Goals • 24x7 availability (but not all connected systems are always up) • Handle peak traffic without slowing down • Good response time from called servers • Minimize outages (frequency & duration) • Weekly updates of production JA-SIG 12/5/2005

  9. Production Updates • All portal code is on our servers • Prefer weekly releases • Prepare a staged directory (Monday PM) • Deploy early Tuesday (between 5 & 7 AM) • Prefer “rolling restarts” to avoid outages JA-SIG 12/5/2005

  10. JA-SIG 12/5/2005

  11. The road to production • Files migrate thru 5 environments • Development • Test • QA • Production • Demo • 3,000+ files in each environment JA-SIG 12/5/2005

  12. Overview of environments • Development • the Wild West • CVS available, but not required • Test • Files must flow thru CVS to get to test • Developers apply “test” tag in CVS • Updates Mon-Fri 4:15 AM and “right now” • All test migrations stop/restart test JA-SIG 12/5/2005

  13. Overview of environments • QA • Files flow thru CVS • Developers request migration via MUMMR • Run load tests here • Production • Files flow thru CVS • Demo • Files flow thru CVS • Nearly as important as production JA-SIG 12/5/2005

  14. Files flow thru CVS • Question: How do we control the flow? • How to mark a file for promotion? • How to know what files got promoted… • Which version? • Where? • When? • Answer: CVS tags • Drive the process • Indicate what’s where, since when JA-SIG 12/5/2005

  15. Some CVS tags JA-SIG 12/5/2005

  16. CVS tag maintenance • Who maintains which tags? • Developers apply and move test tags • MUM admins apply qa, prod, demo tags • Scripts apply and move in and outa tags • Scripts create update history tags • What’s the purpose of the outa tags? • Track deletes (like adds and changes) • Encourage developers to clean up • Avoid permanent loss of old code (in Attic) JA-SIG 12/5/2005

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  18. Why a MUMMR? • Reproducible instructions • QA is where we test the MUMMR • Complete list of files? • Clear instructions? • If we find problems, fix & resubmit MUMMR • Increase odds of successful production move • Documentation • Tell Help Desk and others what’s coming JA-SIG 12/5/2005

  19. Files flow JA-SIG 12/5/2005

  20. CVS tags - Who cares? • Developers • Where’s my code? • Project Managers • Which version was installed where and when? • Migration Controllers • What’s scheduled to move? • Everyone • What’s the difference between X and Y? JA-SIG 12/5/2005

  21. How comparing tags can help • Preparing to update 100+ production files • Apply prod tags according to MUMMR • Refresh export of files tagged prod • Compare inqa and prod • If all files are moving, there should be no diffs • All differences should be examined • Partial migrations are opportunities for problems • Developers can use same technique • Compare intest and inqa to get MUMMR right JA-SIG 12/5/2005

  22. That’s the main story, but… • Environmental files • permanently branched in CVS (never merged) • 19 branches for properties.txt • convert: Tomcat to WebSphere to WebLogic • sometimes had 8+ active environments • Sometimes have multi-flavored regular tags • wastest, testwls, test89, qa89, etc. • always kept test tag for current • normalized tags after conversion to WebLogic JA-SIG 12/5/2005

  23. Some environmental branches • Current • my-dev35-wl-mumdev & my-dev89… • my-test35-wl-mumdev & my-test89… • my-qa35-wl-qa & my-qa89… • my-prod35-wl-prod • my-demo35-wl-prod • Former • bob-marley (ran on a PC) • my-spheredev-mumdev JA-SIG 12/5/2005

  24. Controls in CVS • Regular application files • tag changes limited via CVS filter (taginfo) • Environmental files • anyone can grab a branch • commits trigger e-mail notice to MUM admins • commits on dev or test branches are OK • commits on other branches, if not by MUM admins, may cause questions JA-SIG 12/5/2005

  25. Using these methods elsewhere • We built a similar system for a COBOL app • CVS repository and app on AIX • 6 files in production app directory • Clean A-B-C design yields easy scripts • A-B-C = separation of App, Bin, Config files • Contents of document aimed at 3 audiences • Managers (General Overview ~ 17 pages) • Designers (Design Decisions ~ 5 pages) • Implementers (Details & Example Scripts ~ 30 pages) JA-SIG 12/5/2005

  26. Samples from “old” document • Our CVS taginfo filter calls tagcheck.pl • tagcheck.pl lets admins change any tag • How do we know tagcheck.pl is working? • see S.220 for test plan • brief primer on basics of CVS - G.040 • blank MUMMR – X.110 https://mywebspace.wisc.edu/jfthomps/vc/intvc JA-SIG 12/5/2005

  27. That was most of Chapter 1 • Last year’s presentation • More focus on A-B-C design • Pointed out some documented cautions • Tags for tracking uPortal conversion (ignored) • Rant about optional version control • Moving forward • Tagging and tracking uPortal frameworks • Going beyond A-B-C … to X-Y-Z designs • Ant, more new tags and reports JA-SIG 12/5/2005

  28. Moving to uPortal • What will change and what won’t? • Good bye, Makefiles… Hello, ant • Basic CVS tags and processes will continue • Simpler shell scripts; more complex build.xml • cvs-update.xml (build.xml) calls cvs-logntag.pl • Some new tags for uPortal frameworks • New (optional) milestone tags • Reports to find and compare tags JA-SIG 12/5/2005

  29. uPortal frameworks in CVS • Import vendor files on vendor branch • Separate vendor branch for each vendor • Keep our local modifications on trunk • CVS tags to identify and control • Vendor releases (Vup2-5-0) • Local customization testing (Rdev2-5-0) • Releases for our environments (Rdev, Rtest…) • https://mywebspace.wisc.edu/jfthomps/vc/CVS_up.html JA-SIG 12/5/2005

  30. More CVS Tags JA-SIG 12/5/2005

  31. Families of uPortal tags • Regular (app) tags • test, qa, prod, demo • status (in, outa), update history and milestone tags • Framework tags • Vup2-5-0, Rdev2-5-0, Rdev, Rtest, Rqa, Rprod, Rdemo • Rxx status (in, outa), update history and milestone tags • Environment branches • my-dev-tc-mumdev, my-test-tc-mumdev, etc. • thinking about status (in, outa) and milestone tags JA-SIG 12/5/2005

  32. Which tags are used where? • Milestone tags are optional (0, 1 or 2) • Status tags are optional • Update history tags are optional • Custom blends are feasible • Private (e.g., desktop/laptop) development • Update with prod (or qa) code for 90% of files • Update to HEAD where you’re working • Controlled chaos JA-SIG 12/5/2005

  33. Finding uPortal environment files • All over the place • in uPortal framework • in portlets • in batch directories • in admin directories • Listed in map-cvs-branched-env-files.xml(maps found in multiple locations) JA-SIG 12/5/2005

  34. Updating environment files • Targets within cvs-update.xml • Find all map-cvs-branched-env-files.xml • Parse each map • Using 2 XSL style sheets, build and run cvs updates for each mapped file and directory (using supplied ENV branch) • Thank you, Bruce! JA-SIG 12/5/2005

  35. Our busy Ant build.xml • Major targets of cvs-update.xml • help • status (also run by each update) • updateApp • updateFwk • updateAll • Main parameters of cvs-update.xml • several to specify, skip or set CVS tags JA-SIG 12/5/2005

  36. Some uPortal updates • Predev (for framework development) • updateAll–Dfwktag=Rdev2-5-0 –Dregtag=qa … • Dev (release new framework) • updateFwk–Dfwktag=Rdev –DmodFwkTags=y … • Test (usual test code update) • updateApp–Dregtag=test –DmodRegTags=y … JA-SIG 12/5/2005

  37. Typical test update • Developer (or cron) runs update script • Script tees output and e-mails scanner • Scanner (via procmail) parses output • Puts copy of raw output (~160k) on the web • Builds HTML copy (anchor tags each problem) • Builds HTML summary (2k map) on the web • Mails summary (map) of results to developers • Thank you, Curt! • Update creates verbose CVS status report JA-SIG 12/5/2005

  38. How to track herds of CVS tags • Parse the verbose CVS status reports • Can also track Epicentric/Vignette files • cvs-show-tags.pl finds and counts tags • Defaults to not showing Update History tags • Can include branch names (or all tags) • cvs-diff-tags.pl compares 2 tags/branches • Option to show CVS revs of updated files • Summary of all changed files JA-SIG 12/5/2005

  39. Tracking old and new • Moving from Epicentric/Vignette to uPortal • Old CVS repository for 8 Epicentric instances • New CVS repository for 8 uPortal instances • Essential requirements • CVS is always the absolute source • Scripts install all (no short cuts) • What else might we tag and monitor? • a partridge in a pear tree? JA-SIG 12/5/2005

  40. Getting our ducks in a row • Yep, that duck is tagged • Indeed, this duck is on a branch JA-SIG 12/5/2005

  41. What can we share? When? • Older Make-based methods are documented • for an A-B-C design (separate Apps & Config) • shell scripts and some perl • Newer Ant-based methods are evolving • maps locate environment (config) files • shell scripts, cvs-update.xml and some perl • some earlier documents may still be relevant • Share via Clearinghouse or wiki? JA-SIG 12/5/2005

  42. What about subversion? • Some folks use and like it a lot • Using our tag scheme might not be trivial • Need to spend some time with svn • Others with svn experience? • Version Control BoF to follow • Scott Battaglia (Rutgers) and I will co-host • Come and join us! JA-SIG 12/5/2005

  43. Questions ??? https://mywebspace.wisc.edu/jfthomps/vc “Prediction is difficult, especially about the future.” – Yogi Berra JA-SIG 12/5/2005

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