Bend time to your will with git

Oct 16, 20211 like198 views

Most people understand the basics of git. Creating a repository, branching, merging... those are all pretty simple tasks. Part of the power of git resides in its ability to actually manipulate the history of a repository and clean things up, remove things that should not have been there, and do detective work. Let's spin up our time machine and mess around with the past.

Bend Time to Your Will with
git
Chris Tankersley
@dragonmantank

“Never forget that
the greatest magic
of all is...
CHRONOMANCY!”
-Arthur Aguefort

git stores snapshots of
your files as well as
their parent

Explore alternate and parallel timelines

A parent can have
many children, but a
child only has one
parent

Resolving Multiple Timelines - Remote
244426b0 2 hours ago - Merged branch feature/time-feature
a7ec8a44 3 days ago - Added Time class
a9cad80d 1 month ago - Deleted unneeded dependency on VendorBaz
21420248 1 month ago - Initial Commit

Resolving Multiple Timelines - Local
e454fa2e 10 hours ago - Merged branch bugfix/broken-dependencies
c23d5765 10 hours ago - Updated dependencies
a9cad80d 1 month ago - Deleted unneeded dependency on VendorBaz
21420248 1 month ago - Initial Commit

A clean and easily readable history
is more preferable than an
“accurate” one
A hot take!

“History is written by victors, which is why it
has no typos”

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pick c23d576 Last important thing we did
pick 1ba90ea New Feature
pick 2142024 Fixed Variable Name
pick a9cad80 Updated template
pick a7ec8a4 Fixed Typo
pick 244426b I can spel, really
pick b2b99fb Feature done

# Commands:
# p, pick <commit> = use commit
# r, reword <commit> = use commit, but edit the commit message
# e, edit <commit> = use commit, but stop for amending
# s, squash <commit> = use commit, but meld into previous commit
# f, fixup <commit> = like "squash", but discard this commit's log
message

Squash - Combine and keep
all comments
Fixup - Just combine and
keep first comment

Squashing is best for merges, and
fixup is better for day-to-day cleanup
A hot take!

pick c23d576 Last important thing we did
pick 1ba90ea New Feature
fixup 2142024 Fixed Variable Name
pick a9cad80 Updated template
fixup a7ec8a4 Fixed Typo
fixup 244426b I can spel, really
pick b2b99fb Feature done

pick c23d576 Last important thing we did
pick 8eda557 New Feature
pick a9cad80 Updated template
fixup a7ec8a4 Fixed Typo
fixup 244426b I can spel, really
pick b2b99fb Feature done

pick c23d576 Last important thing we did
pick 8eda557 New Feature
pick 3d52243 Updated template
fixup 244426b I can spel, really
pick b2b99fb Feature done

pick c23d576 Last important thing we did
pick 8eda557 New Feature
pick 321fe64 Updated template
pick b2b99fb Feature done

pick c23d576 Last important thing we did
pick 8eda557 New Feature
pick 321fe64 Updated template
pick ed4d525 Feature done

WARNING
Feel free to rebase as much as you want on your own
personal branches. Once someone else starts to work with
you branch (especially committing their own code), be
careful about rebasing!
tl;dr - rebase on personal branches, not on shared
branches

“Nobody forgets where they buried old
commits*”
* For like 90 days or something

https://rtyley.github.io/bfg-repo-cleaner/

BGF Repo-Cleaner (and
filter-branch) will not affect remote
checkouts.
You will still want to rotate any
passwords and keys.

Jump around the timeline with git-bisect

git-bisect needs a
good commit, and a
bad commit

git bisect start
git bisect good 1ba90ea
git bisect bad b2b99fb

git bisect good
>> a9cad80 is the first bad commit

Thank You!
Chris Tankerley
Lead Engineer at smarTours
@dragonmantank
chris@ctankersley.com
https://ctankersley.com

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Bend time to your will with git

1. Bend Time to Your Will with git Chris Tankersley @dragonmantank

2. “Never forget that the greatest magic of all is... CHRONOMANCY!” -Arthur Aguefort

3. git is just a timeline of events

8. git stores snapshots of your files as well as their parent

9. Going back in time

11. git checkout cfe88cd

13. Explore alternate and parallel timelines

15. git checkout -b newbranch

17. A parent can have many children, but a child only has one parent

18. Combine timelines

20. Keeping Tidy Histories

21. Resolving Multiple Timelines - Remote 244426b0 2 hours ago - Merged branch feature/time-feature a7ec8a44 3 days ago - Added Time class a9cad80d 1 month ago - Deleted unneeded dependency on VendorBaz 21420248 1 month ago - Initial Commit

22. Resolving Multiple Timelines - Local e454fa2e 10 hours ago - Merged branch bugfix/broken-dependencies c23d5765 10 hours ago - Updated dependencies a9cad80d 1 month ago - Deleted unneeded dependency on VendorBaz 21420248 1 month ago - Initial Commit

24. What does a `git pull` look like?

25. Using `git pull --rebase`

27. A clean and easily readable history is more preferable than an “accurate” one A hot take!

28. Rewriting History

29. “History is written by victors, which is why it has no typos”

31. N e w F e a t u r e F i x e d V a r i a b l e N a m e U p d a t e d T e m p l a t e F i x e d T y p o I c a n s p e l , r e a l l y F e a t u r e D o n e

32. git rebase -i c23d576

34. pick c23d576 Last important thing we did pick 1ba90ea New Feature pick 2142024 Fixed Variable Name pick a9cad80 Updated template pick a7ec8a4 Fixed Typo pick 244426b I can spel, really pick b2b99fb Feature done

35. # Commands: # p, pick <commit> = use commit # r, reword <commit> = use commit, but edit the commit message # e, edit <commit> = use commit, but stop for amending # s, squash <commit> = use commit, but meld into previous commit # f, fixup <commit> = like "squash", but discard this commit's log message

36. Squash - Combine and keep all comments Fixup - Just combine and keep first comment

37. Squashing is best for merges, and fixup is better for day-to-day cleanup A hot take!

38. pick c23d576 Last important thing we did pick 1ba90ea New Feature fixup 2142024 Fixed Variable Name pick a9cad80 Updated template fixup a7ec8a4 Fixed Typo fixup 244426b I can spel, really pick b2b99fb Feature done

39. pick c23d576 Last important thing we did pick 1ba90ea New Feature fixup 2142024 Fixed Variable Name pick a9cad80 Updated template fixup a7ec8a4 Fixed Typo fixup 244426b I can spel, really pick b2b99fb Feature done Creates a new document with the combined text

40. pick c23d576 Last important thing we did pick 8eda557 New Feature pick a9cad80 Updated template fixup a7ec8a4 Fixed Typo fixup 244426b I can spel, really pick b2b99fb Feature done

41. pick c23d576 Last important thing we did pick 8eda557 New Feature pick a9cad80 Updated template fixup a7ec8a4 Fixed Typo fixup 244426b I can spel, really pick b2b99fb Feature done Creates a new document with the combined text

42. pick c23d576 Last important thing we did pick 8eda557 New Feature pick 3d52243 Updated template fixup 244426b I can spel, really pick b2b99fb Feature done

43. pick c23d576 Last important thing we did pick 8eda557 New Feature pick 3d52243 Updated template fixup 244426b I can spel, really pick b2b99fb Feature done Creates a new document with the combined text

44. pick c23d576 Last important thing we did pick 8eda557 New Feature pick 321fe64 Updated template pick b2b99fb Feature done

45. pick c23d576 Last important thing we did pick 8eda557 New Feature pick 321fe64 Updated template pick ed4d525 Feature done

47. WARNING Feel free to rebase as much as you want on your own personal branches. Once someone else starts to work with you branch (especially committing their own code), be careful about rebasing! tl;dr - rebase on personal branches, not on shared branches

48. “Nobody forgets where they buried old commits*” * For like 90 days or something

50. Let’s say you want to kill your grandpa

51. https://rtyley.github.io/bfg-repo-cleaner/

52. BGF Repo-Cleaner (and filter-branch) will not affect remote checkouts. You will still want to rotate any passwords and keys.

53. Pull in changes from the main timeline

55. git fetch origin git merge origin/main

57. git fetch origin git rebase origin/main

59. Playing Time Detective

60. Jump around the timeline with git-bisect

62. A bug was discovered

63. git-bisect needs a good commit, and a bad commit

64. We know it works here