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Why should I learn Git? I'm just a software developer
- 1. +45 36772 762 info@praqma.com www.praqma.com Why should I learn Git? I’m just a software developer Johan Abildskov
- 2. +45 36772 762 info@praqma.com www.praqma.com The problem ?!?
- 3. +45 36772 762 info@praqma.com www.praqma.com Relating Directory Snapshots
- 6. +45 36772 762 info@praqma.com www.praqma.com Maintaining Multiple Versions V0.2 V1.0 V2.0 V3.0 V1.1 V1.2 V1.1.5
- 8. +45 36772 762 info@praqma.com www.praqma.com Reversing the flow of time ● git checkout ● git revert ● git reset
- 10. +45 36772 762 info@praqma.com www.praqma.com Who wrote these lines? git blame to the rescue git blame -L 267,272 MemoryMapRecorder.java 0cfcfd51 (Mads Nielsen 2012-10-03 08:32:06 +0200 267) 0cfcfd51 (Mads Nielsen 2012-10-03 08:32:06 +0200 268) @Override 0cfcfd51 (Mads Nielsen 2012-10-03 08:32:06 +0200 269) public String getDisplayName() { e8e7bb97 (Mads Nielsen 2012-12-13 12:26:28 +0100 270) return "Memory Map Publisher"; 0cfcfd51 (Mads Nielsen 2012-10-03 08:32:06 +0200 271) } 0d290c6e (Mads Nielsen 2012-10-03 15:47:58 +0200 272) Searching through the history
- 11. +45 36772 762 info@praqma.com www.praqma.com git log -p -S findScm GitBridge.java commit ea9bd9c1c1d7168ebfc0bef4bcc4f867dfdfa058 Author: Thierry Lacour <thi@praqma.net> Date: Wed Nov 18 10:37:41 2015 +0100 Added Credentials tests diff --git a/src/main/java/org/jenkinsci/plugins/pretestedintegration/scm/git/GitBridge.java b/src/main/java/org/jenkinsci/plugins/pretestedintegration/scm/git/GitBridge.java index d918ff1..f675a46 100644 --- a/src/main/java/org/jenkinsci/plugins/pretestedintegration/scm/git/GitBridge.java +++ b/src/main/java/org/jenkinsci/plugins/pretestedintegration/scm/git/GitBridge.java @@ -29,7 +29,6 @@ import jenkins.model.Jenkins; import org.apache.commons.lang.StringUtils; import org.eclipse.jgit.lib.ObjectId; import org.eclipse.jgit.transport.RefSpec; -import org.jenkinsci.plugins.gitclient.Git; import org.jenkinsci.plugins.gitclient.GitClient; Using the microscope
- 13. +45 36772 762 info@praqma.com www.praqma.com When was this bug introduced? Binary search through your commit history git bisect start git bisect bad git bisect good [known good commit] Bisecting: 6 revisions left to test after this [ecb6e1bc347ccecc5f9350d878ce677feb13d3b2] error handling on repo Test if state is good or bad... git bisect bad Bisecting: 3 revisions left to test after this [b047b02ea83310a70fd603dc8cd7a6cd13d15c04] secure this thing
- 14. +45 36772 762 info@praqma.com www.praqma.com Even for the lazy git bisect start HEAD v1.0 Automating bisect git bisect run test-error.sh
- 15. +45 36772 762 info@praqma.com www.praqma.com Strong offline workflow
- 16. +45 36772 762 info@praqma.com www.praqma.com In a connected world
- 18. +45 36772 762 info@praqma.com www.praqma.com Expected Developer Skills? Domain Knowledge Programming Language Standard Library? IDE Source Control?
- 19. +45 36772 762 info@praqma.com www.praqma.com “We are used to working this way”
- 20. +45 36772 762 info@praqma.com www.praqma.com Let’s stop guessing!
- 21. +45 36772 762 info@praqma.com www.praqma.com What do our devs have in common?
- 22. +45 36772 762 info@praqma.com www.praqma.com The Stack Overflow Dev Survey ● 2015: >26.000 participants ● 2016: >50.000 participants ● Worklife ● Technologies ● Happiness ● Star Wars vs. Star Trek
- 23. +45 36772 762 info@praqma.com www.praqma.com What worklife challenges are you experiencing?
- 24. +45 36772 762 info@praqma.com www.praqma.com What’s important to you in your worklife?
- 25. +45 36772 762 info@praqma.com www.praqma.com How often do you check-in code?
- 26. +45 36772 762 info@praqma.com www.praqma.com Continuous Integration Makes You Happy!
- 29. +45 36772 762 info@praqma.com www.praqma.com .. And the winner is ..
- 30. +45 36772 762 info@praqma.com www.praqma.com A great community
- 31. +45 36772 762 info@praqma.com www.praqma.com Git Usage at Microsoft
- 32. +45 36772 762 info@praqma.com www.praqma.com Newly minted student
- 34. +45 36772 762 info@praqma.com www.praqma.com Plumbing and Porcelain
- 35. +45 36772 762 info@praqma.com www.praqma.com ● Distributed ● Composable ● Light-weight branches ● Fast! Git for Continuous Delivery
- 36. +45 36772 762 info@praqma.com www.praqma.com What’s stopping you?
- 38. +45 36772 762 info@praqma.com www.praqma.com Use the tools that are already out there 2git.io
- 39. +45 36772 762 info@praqma.com www.praqma.com Do you know Git?
- 42. +45 36772 762 info@praqma.com www.praqma.com Many Branches
- 43. +45 36772 762 info@praqma.com www.praqma.com What lever to pull?
Editor's Notes
- I want it such that whenever my colleagues do something stupid - I’m protected
- Git checkout to go investigate the ancient times git revert to undo something in the ancient times git reset to even change our workspace and our branches This is *all* available locally
- When was this change introduced
- This might not necessarily be what we want, what if Mads just changed the indents?
- Or what about this Bug
- Could also run maven test or similar. Just needs zero / non-zero exit cod.
- I want to be able to work with the full power of my tools even if I’m offline, or to get local performance And in Git this is the case
- Power comes from collaboration we have strong tools git branching is extremely light
- We can’t introduce a new tool, because I developers can’t figure it out, because they do not want to learn a new technology
- Something about even Github, Bitbucket and GitLab, competitors join together around Git - they collaborate.
- So no matter if you get a new student
- Or people with experience from other companies, it is very likely that they know Git already
- Git comes with both plumbing and porcelain, the things that you use and the things that work behind the scenes to give you the tools that you are using. This is very strong in terms of enabling composability of your tools
- Well, it might be hard to migrate everything, while you are continuously working.