jazoon'13 - stefan saasen - true git: the great migration
DESCRIPTION
http://guide13.jazoon.com/#/submissions/175TRANSCRIPT
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True The great migration
Stefan Saasen
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TODO Show of hands
Picture with hands/lighter/concert
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Source Control Management
SVN Git
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Source Control Management
2011 2013 (projected) 2013 2015 (projected)
SVN Git
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Source Control Management
2011 2013 (projected) 2013 2015 (projected)
20
78
SVN Git
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Source Control Management
2011 2013 (projected) 2013 2015 (projected)
20
78
41
68
SVN Git
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Source Control Management
2011 2013 (projected) 2013 2015 (projected)
20
78
41
68
49
70
SVN Git
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Source Control Management
2011 2013 (projected) 2013 2015 (projected)
20
78
41
68
49
70 68
55
SVN Git
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Stefan SaasenAtlassian Stash Development Lead
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Stefan SaasenAtlassian Stash Development Lead
I come out nice in pictures, I know :-). @stefansaasen
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Why am I passionate about this?
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Why Git?
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Branching & Merging
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Branching & Mergingfast, cheap and simple
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Branching & Mergingfast, cheap and simple
first class concept
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Branching & Mergingfast, cheap and simple
first class concept
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Foundation for new workflows
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Speed
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Speed
git loggit diffgit status
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Speed
git bisect
git loggit diffgit status
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git bisect
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Bad
git bisect
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Bad
Good (v2.7)
git bisect
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Bad
Test
git bisect
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Bad
Test
git bisect
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Bad
Regression!
git bisect
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Regression!
Fast graph traversalFast checkout
git bisect
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Speed
git bisect
git loggit diffgit status
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Enables new features
Improves basic features
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Local commits
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Local commits
Edit & Publish
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Local commitsRewrite History
Edit & Publish
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Local commitsRewrite History
Edit & Publish
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Flexibility
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Git does what you are doing today, only better
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S V N
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L A B E L T I T L E
GIT
S V N
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L A B E L T I T L E
GIT
S V N
Existing workflows
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L A B E L T I T L E
GIT
S V N
New ways of collaborating
Existing workflows
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L A B E L T I T L E
GIT
S V N
New ways of collaborating
Existing workflows
New branchworkflows
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L A B E L T I T L E
GIT
S V N
New ways of collaborating
Existing workflows
New branchworkflows
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L A B E L T I T L E
GIT
S V N
New ways of collaborating
Existing workflows
New branchworkflows
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L A B E L T I T L E
GIT
S V N
New ways of collaborating
Existing workflows
New branchworkflows
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Release branching master
2.8
2.7
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Release branching master
2.8
2.7
Bugfix
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Release branching master
2.8
2.7
Bugfix
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Release branching master
2.8
2.7
Bugfix
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Release branching master
2.8
2.7
Bugfix
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Release branching master
2.8
2.7
Bugfix
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Real World git workflowsS t e f a n S a a s e n
W e d n e s d a y - 1 4 : 0 0
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So you’ve decided to migrate!
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The process
1
2
3
Inception
Adoption
Conversion
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Inception 1
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• Is git suitable?
Inception 1
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• Is git suitable?
• Test the conversion
Inception 1
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• Is git suitable?
• Test the conversion
• Identify the repositories that need to be converted
Inception 1
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• Is git suitable?
• Test the conversion
• Identify the repositories that need to be converted
• Identify the tools that need to be updated. CI, issue tracking, IDE, scripts and build tools, deployment tools
Inception 1
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1
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1
2
3
The process
Inception
Adoption
Conversion
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Adoption 2
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• You need to answer: “What’s in it for me”
Adoption 2
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• You need to answer: “What’s in it for me”
• Make sure tooling is ready and can be used by everyone
Adoption 2
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• You need to answer: “What’s in it for me”
• Make sure tooling is ready and can be used by everyone
• Identify the git champions - they will be thrilled to help
Adoption 2
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• You need to answer: “What’s in it for me”
• Make sure tooling is ready and can be used by everyone
• Identify the git champions - they will be thrilled to help
• Don’t expect to win everyone over immediately
Adoption 2
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2
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Just text by itself, for impact.
2
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1
2
3
The process
Inception
Adoption
Conversion
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We’ve got you covered!
&Scripts Tutorial & Documentation
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We’ve got you covered!
&Scripts Tutorial & Documentation
bit.ly/go-dvcs
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git-svn
3
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3Conversion - Preparation
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jdeveloper = John Developer <[email protected]>
Map Authors
Identify SVN repository layout
/tags/trunk/branches
3Conversion - Preparation
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git svn clone \ --authors-file=/authors.txt \ --trunk=/trunk \ --tags=/tags \ --branches=/branches
3Conversion - Initial Clone
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git svn clone \ --authors-file=/authors.txt \ --trunk=/trunk \ --tags=/tags \ --branches=/branches
3Conversion - Initial Clone
?
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3Conversion - Sync
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3Conversion - Sync
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git svn fetch
3Conversion - Sync
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Infrastructure first 3
C I I s s u e s I D E
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Infrastructure first 3
C I I s s u e s I D E
read-only
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Infrastructure first 3
C I I s s u e s I D E
read-only
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Infrastructure first 3
C I I s s u e s I D E
read-only
Sync every minute
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• Cleanup branches
• Remove unused files
• Create git tags
• Remove commit metadata
3Conversion - Cleanup
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• Cleanup branches
• Remove unused files
• Create git tags
• Remove commit metadata
3Conversion - Cleanup
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3
C I I s s u e s I D E
read-only
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Then your team 3
C I I s s u e s I D E
read-only
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Then your team 3
C I I s s u e s I D E
read-only
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Then your team 3
C I I s s u e s I D E
read-only
![Page 90: JAZOON'13 - Stefan Saasen - True Git: The Great Migration](https://reader033.vdocuments.net/reader033/viewer/2022051514/54b72fa44a7959193b8b45e0/html5/thumbnails/90.jpg)
Other Tools?
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SubGit
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1
2
3
The process
Inception
Adoption
Conversion
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Or are you?
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Just text by itself, for impact.
Collaboration model?Branching model?
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+
Enterprise
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Centralized=+
Enterprise
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Centralized=+
Enterprise
Builds
MetricsIssues
Deployments
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Workflows will change
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Workflows will changefor the better
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Workflows will changefor the better
but they don’t have to change on day one!
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This happened in both Confluence and JIRA...
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master
confluence-project-4.0
CONF-1234
From SVN like
![Page 103: JAZOON'13 - Stefan Saasen - True Git: The Great Migration](https://reader033.vdocuments.net/reader033/viewer/2022051514/54b72fa44a7959193b8b45e0/html5/thumbnails/103.jpg)
master
confluence-project-4.0
CONF-1234
git cherry-pick bae6251
From SVN like
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master
confluence-project-4.0
CONF-1234
git cherry-pick bae6251
From SVN like
![Page 105: JAZOON'13 - Stefan Saasen - True Git: The Great Migration](https://reader033.vdocuments.net/reader033/viewer/2022051514/54b72fa44a7959193b8b45e0/html5/thumbnails/105.jpg)
master
confluence-project-4.0
CONF-1234
From SVN like
![Page 106: JAZOON'13 - Stefan Saasen - True Git: The Great Migration](https://reader033.vdocuments.net/reader033/viewer/2022051514/54b72fa44a7959193b8b45e0/html5/thumbnails/106.jpg)
master
confluence-project-4.0
CONF-1234
From SVN like
![Page 107: JAZOON'13 - Stefan Saasen - True Git: The Great Migration](https://reader033.vdocuments.net/reader033/viewer/2022051514/54b72fa44a7959193b8b45e0/html5/thumbnails/107.jpg)
master
confluence-project-4.1
To git branch based workflow
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master
confluence-project-4.1
To git branch based workflow
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master
confluence-project-4.1
CONF-2345
To git branch based workflow
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master
confluence-project-4.1
CONF-2345
git merge confluence-project-4.1
To git branch based workflow
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master
confluence-project-4.1
CONF-2345
To git branch based workflow
![Page 112: JAZOON'13 - Stefan Saasen - True Git: The Great Migration](https://reader033.vdocuments.net/reader033/viewer/2022051514/54b72fa44a7959193b8b45e0/html5/thumbnails/112.jpg)
master
confluence-project-4.1
CONF-2345
git merge confluence-project-4.1
To git branch based workflow
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Conclusion
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0
20
40
60
80
2011 2013 (projected) 2013 2015 (projected)
68
4941
20
55
706878
SVN Git
![Page 115: JAZOON'13 - Stefan Saasen - True Git: The Great Migration](https://reader033.vdocuments.net/reader033/viewer/2022051514/54b72fa44a7959193b8b45e0/html5/thumbnails/115.jpg)
0
20
40
60
80
2011 2013 (projected) 2013 2015 (projected)
68
4941
20
55
706878
SVN Git
![Page 116: JAZOON'13 - Stefan Saasen - True Git: The Great Migration](https://reader033.vdocuments.net/reader033/viewer/2022051514/54b72fa44a7959193b8b45e0/html5/thumbnails/116.jpg)
Subversion (58%) is being
threatened by Git (47%) for de facto leadership of the Version Control space. Z E R O T U R N A R O U N D D E V E L O P E R P R O D U C T I V I T Y R E P O R T 2 0 1 3
”
“
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is here to stay
![Page 118: JAZOON'13 - Stefan Saasen - True Git: The Great Migration](https://reader033.vdocuments.net/reader033/viewer/2022051514/54b72fa44a7959193b8b45e0/html5/thumbnails/118.jpg)
expands
![Page 119: JAZOON'13 - Stefan Saasen - True Git: The Great Migration](https://reader033.vdocuments.net/reader033/viewer/2022051514/54b72fa44a7959193b8b45e0/html5/thumbnails/119.jpg)
migration is a solved problem
![Page 120: JAZOON'13 - Stefan Saasen - True Git: The Great Migration](https://reader033.vdocuments.net/reader033/viewer/2022051514/54b72fa44a7959193b8b45e0/html5/thumbnails/120.jpg)
Thank you for yourattention!
@stefansaasen
www.atlassian.com
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Image creditshttp://www.flickr.com/photos/marfis75/3272079115/sizes/o/
http://www.flickr.com/photos/al-taqi/4135841914/
http://www.flickr.com/photos/duremi/3200067353/sizes/o/