How GitWorks Git IsNotWhatYouThink Were going to talk aboutthe - - PowerPoint PPT Presentation

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Apr 24, 2023 277 likes •590 views

How GitWorks Git IsNotWhatYouThink Were going to talk aboutthe internals ofGit. Porcelain Commands gitadd gitcommit git push gitpull git branch gitcheckout git merge gitrebase

SLIDE 1

Git IsNotWhatYouThink

How GitWorks

SLIDE 2

We’re going to talk aboutthe internals ofGit.

SLIDE 3

“Porcelain”Commands

▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪

gitadd gitcommit git push gitpull git branch gitcheckout git merge gitrebase …

SLIDE 4

“Plumbing”Commands

▪ ▪ ▪ ▪

git cat-file git hash-object gitcount-objects …

SLIDE 5

If youwant to masterGit,don’tworry about learning thecommands. Instead, learn themodel.

SLIDE 6

Git

SLIDE 7

GitIs..

…a Distributed RevisionControl System

SLIDE 8

GitIs..

…a Revision ControlSystem

SLIDE 9

GitIs..

…aStupid Content Tracker

SLIDE 10

GitIs..

…a PersistentMap

SLIDE 11

Any sequence ofbytes SHA1hash

Values andKeys

SLIDE 12

“ApplePie” 23991897e13e47ed0adb91a0082c31c82fe0cbe5

Values andKeys

SLIDE 13

Every object in Git hasitsown SHA1. So, what if theycollide?

SLIDE 14

Winning theJackpot

1 chance in175.000.000

SLIDE 15

Winning theJackpot

SLIDE 16

Chances of Two SHA1sColliding

SLIDE 17

SHA1s are unique in theuniverse.

SLIDE 18

GitIs..

…a PersistentMap

SLIDE 19

GitIs..

…aStupid Content Tracker

SLIDE 20

The ObjectDatabase

1177 be4d

./

SLIDE 21

The ObjectDatabase

Apple Pie

1177 2399 be4d

menu.txt

./

3ee7

recipes/

SLIDE 22

The ObjectDatabase

Apple Pie

Put your recipes in this directory, recipe per

file.

1177 2399 361a be4d

README.txt

3ee7

apple_pie.txt menu.txt

./

recipes/

SLIDE 23

The Git ObjectModel

Apple Pie

Put your recipes in this directory, recipe per

file.

1177 2399 361a be4d

README.txt

3ee7

apple_pie.txt menu.txt

./

recipes/

SLIDE 24

The Git ObjectModel

Apple Pie

Put your recipes in this directory, recipe per

file.

1177 2399 361a be4d

README.txt

2508 3ee7

apple_pie.txt menu.txt

./

recipes/

SLIDE 25

The Git ObjectModel

Apple Pie

Put your recipes in this directory, recipe per

file.

1177 2399 361a be4d

README.txt

2508 6ee0 3ee7

apple_pie.txt

./

menu.txt

./

recipes/

SLIDE 26

The Git ObjectModel

Apple Pie

Put your recipes in this directory, recipe per

file.

1177 2399 361a be4d

README.txt

2508 6ee0 f1fe 3ee7

apple_pie.txt

./

Apple Pie Cheesecake

menu.txt menu.txt recipes/

./

recipes/

SLIDE 27

The Git ObjectModel

Apple Pie

Put your recipes in this directory, recipe per

file.

1177 2399 361a be4d

README.txt

2508 6ee0 f1fe 3ee7

apple_pie.txt

./

Apple Pie Cheesecake

menu.txt menu.txt recipes/

./

recipes/

mytag

SLIDE 28

GitObjects

▪ ▪ ▪ ▪

Blobs Trees Commits AnnotatedTags

SLIDE 29

What Git ReallyIs

1177 2399 3ee7 361a be4d 2508 6ee0 f1fe

SLIDE 30