Migrating to Git: Let's Git this party started · Git: •git fast-import CVS content into temporary Git repository •Git-move-refs •git prune, repack, gc and repack •Validate
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Migrating to Git:Let's Git this party started
@Kim_ Moir@paulweb515
IBM Ottawa
Git Happens
@Kim_ Moir@paulweb515
IBM Ottawa
About Us
• 10 year old code repository
• Around 40 active committers
• Produce approximately 600 bundles a build
• Limited Git experience before migration
Active development streams: 4.2, 4.1.x, 3.8, 3.7.x
Unix group (guid) -> Git repo
2 CVS repos -> ~25 Git repos
CVS :
• Condition
• Copy to temporary location
• Run cvs2git
Git:
• git fast-import CVS content into temporary Git repository
• Git-move-refs
• git prune, repack, gc and repack
• Validate the git repo
• Run a script to remove delete only tags
• Add gitignore file via git filter-branch
• Clone into bare repo
• git prune, repack, gc and repack
• copy repo into final location
“It’s one thing to migrate to Git, it’s another thing to use it”
-Olivier Thomann
“Git: The command line is where it’s at”
-Bogdan Gheorge
“Patches are like dumping a database into a text file. You need to think in terms of releasing fixes to branches instead of passing around patches. Patches also lose some Git provenance information such as author and parent.”
-J ohn Arthorne
“That operation is four pay-grade levels above my current git-foo.”
-Paul Webster
“I have broken the platform-ui git repository.”
-Bug 361707
“Better policy to guard against deleting all branches and tags from our public repos”
-Bug 362076
“There are three categories of costs that we incurred during the Git migration:
The migration process itself, the developer learning curve and dealing with EGit issues”
-Mike Wilson
•Read•Test migration•Communicate
“The complexity of our code is the barrier to contribution, not the S CM”.
-Paul Webster
Useful links• Git parable http://tom.preston-werner.com/2009/05/19/the-git-parable.html
• Pro Git Book http://progit.org/
• Think like a git http://think-like-a-git.net/
• Managing large binary files with Git http://stackoverflow.com/questions/540535/managing-large-binary-files-with-git
• Git workflows for CVS users http://wiki.eclipse.org/Platform-releng/Git_ Workflows
• git@eclipse.org mailing list
• E Git Documentation http://eclipse.org/egit/documentation/
• Migration scripts we used git://git.eclipse.org/e4/org.eclipse.migration.git
• Git flow discussion http://dev.eclipse.org/mhonarc/lists/eclipse-dev/msg09229.html
Questions?
“Git happens”
-Kim Moir
-Paul Webster
Give F eedbac k on the S es s ions
1 S ign In: w w w .ec lips ec on.org
2 S elec t S es s ion E va luate
3 Vote
Image credits• Beach http://www.flickr.com/photos/archer10/2218592521/sizes/
• Reading room in British Museum http://www.flickr.com/photos/cliveabrown/2258478542/
• Blackbirds at dusk http://www.flickr.com/photos/moonjazz/1216783552/
• Binary bridge at Georgia Tech http://www.flickr.com/photos/mcclanahoochie/5068845349/sizes/l/in/photostream/
• Branches http://www.flickr.com/photos/e_ phots/3012896283/
• Git stash http://www.flickr.com/photos/dealingwith/4295488113/
• Fork you http://www.flickr.com/photos/sunfox/4365495446/sizes/l/in/photostream/
• Rethink http://www.flickr.com/photos/venegas/5549123/
• Gears http://www.flickr.com/photos/wwarby/4782904694
• Git gas station http://www.flickr.com/photos/soo/6047596987/
• Advice http://www.flickr.com/photos/wurzle/659315/
• Fraser river delta http://www.flickr.com/photos/ecstaticist/3055718118/
Legal notice
• Copyright © IBM Corp., 2007-2012. All rights reserved. This presentation and the source code in it are made available under the Creative Commons Att. Nc Nd 3.0 license.
• J ava and all J ava-based trademarks are trademarks of Sun Microsystems, Inc. in the United S tates, other countries, or both.
• E clipse and the E clipse logo are trademarks of E clipse Foundation, Inc.
• IBM and the IBM logo are trademarks or registered trademarks of IBM Corporation, in the United S tates, other countries or both.
• Other company, product, or service names may be trademarks or service marks of others.
• THE INF ORMATION DIS C US S E D IN THIS PRE S E NTATION IS PROVIDE D F OR INF ORMATIONAL PURPOS E S ONLY. WHILE EFFORTS WERE MADE TO VERIFY THE COMPLETENESS AND ACCURACY OF THE INFORMATION, IT IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, AND IBM SHALL NOT BE RESPONSIBLE FOR ANY DAMAGES ARISING OUT OF THE USE OF, OR OTHERWISE RELATED TO, SUCH INFORMATION. ANY INFORMATION CONCERNING IBM'S PRODUCT PLANS OR STRATEGY IS SUBJECT TO CHANGE BY IBM WITHOUT NOTICE
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