Low Level Git - Speaker Deck

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Low-level Git

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Why Low-level Git • GitͷίΞͷ΄͏ͷ࿩ • ͳΜͱͳ͘Ͱ࢖͍ͬͯͨίϚϯυ͕  Θ͔͖ͬͯͨ • ௐ΂ͯͨΒ͍Ζ͍Ζ͓΋͠Ζ͔ͬͨ

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Start!!

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Git Objects

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> git init

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> ls .git

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> ﬁnd .git/objects

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create ﬁrst commit

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> ls .git/objects

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3 Objects...? • Commit (f7a253e) • .git/objects/f7/a253ed90a5bb56d6cd8b3580485a7ae23acc88 • ??? (05934ea) • .git/objects/05/934ea69782016b0fbaa7bf46d574cefb039958 • ??? (802992c) • .git/objects/80/2992c4220de19a90767f3000a79a31b98d0df7

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> git cat-ﬁle -t {sha1}

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Commit/Tree/Blob • Commit (f7a253e) • .git/objects/f7/a253ed90a5bb56d6cd8b3580485a7ae23acc88 • Tree (05934ea) • .git/objects/05/934ea69782016b0fbaa7bf46d574cefb039958 • Blob (802992c) • .git/objects/80/2992c4220de19a90767f3000a79a31b98d0df7

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Commit? Tree? Blob?

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> git cat-ﬁle commit

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Commit has... • Reference to ‘a’ Tree Object • Author & Committer • Commit Message ! • (Reference(s) to parent)

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> git ls-tree

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Tree has... • Reference to Blob Objects • & File name • & File Permission ! • (Reference to Tree Objects)

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> git cat-ﬁle blob

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Blob is... • commited ﬁle • don’t have a ﬁle name

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merge commit

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commit has a parent

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merge commit has parents

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Question?

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Reference

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• alias to commits • ex) • HEAD • master • some_branch • origin/master Reference?

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Where is Branchs?

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Where is the HEAD?

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HEAD -> ref -> commit

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Question?

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Reference • ࣮ફ Git - ௿Ϩϕϧʹ஌Δ Git • http://www.slideshare.net/youhei/ git-12695573 • ʲ຋༁ʳGitΛϘτϜΞοϓ͔Βཧղ͢ Δ • http://keijinsonyaban.blogspot.jp/2011/05/

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