A deep dive into the Git internals Christoph Hfner @chr1shaefn3r - - PowerPoint PPT Presentation

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a deep dive into the git internals
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A deep dive into the Git internals Christoph Hfner @chr1shaefn3r - - PowerPoint PPT Presentation

Oct 12, 2023 138 likes •250 views

A deep dive into the Git internals Christoph Hfner @chr1shaefn3r Quick Topic Clarifj fjcation We are going to talk about: Git Plumbing .git/objects/ (the object database) .git/refs/ We are NOT going to talk about: Basics

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SLIDE 1

A deep dive into the Git internals

Christoph Häfner

@chr1shaefn3r

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SLIDE 2

Quick Topic Clarifj fjcation

We are going to talk about:

  • Git Plumbing
  • .git/objects/ (the object database)
  • .git/refs/

We are NOT going to talk about:

  • Basics
  • Merge strategies
  • git:// Protokoll
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SLIDE 3

https://xkcd.com/1597/

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SLIDE 4
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SLIDE 5

Plumbing vs. Porcelaine

hash-object cat-file ls-tree mktree commit-tree fsck gc index-pack ls-files mktag pack-objects repack verify-pack commit push pull merge branch checkout clone bisect tag diff

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SLIDE 6

Core Principle

key : value hash(content) content

  • aka. Content-adressable storage
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SLIDE 7

Git Object

key : value sha1(object) zlib(object) Format: <type> <size>\0<value> ⍽

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SLIDE 8

Four Types of Git Objects

blob

fjlecontent

tree

<mode> <fjlename>\0bin(<sha1>) ⍽

commit

tree <sha1>\n ⍽ parent <sha1>\n{0,2} ⍽ author <name> <timestamp+zeitzone>\n ⍽ ⍽ committer <name> <timestamp+zeitzone>\n\n ⍽ ⍽ <commit message>

tag

  • bject <sha1>\n

⍽ type <type>\n ⍽ tag <name> ⍽ tagger <name> <timestamp+zeitzone>\n\n ⍽ ⍽ <tag message>

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SLIDE 9

Wo werden in Git eigentlich die Difg fgs gespeichert?!?!

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SLIDE 10

Quellen

https://www.youtube.com/watch?v=4FUAaPyhOm0 https://git-scm.com/book/en/v2/Git-Internals-Plumbing-and-Porcelain https://www.npmjs.com/package/gitviz

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SLIDE 11

Ende

Christoph Häfner

SAP SE @chr1shaefn3r christoph.haefner@mailbox.org