Git, GitHub, Etc - Speaker Deck

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Git, GitHub, Etc Andy Delcambre

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PLANET ARGON

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DIRECTED ACYCLIC GRAPH

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yt $ git init Initialized empty Git repository in /private/tmp/demo/.git/ yt $ echo "My sweet repo" > README yt ✗ $ git add README yt ✗ $ git status # On branch master # # Initial commit # # Changes to be committed: # (use "git rm --cached ..." to unstage) # # new file: README # yt ✗ $ git commit -m "Add a README" [master (root-commit) 8a720fa] Add a README 1 file changed, 1 insertion(+) create mode 100644 README yt $ git log commit 8a720fa06710948f2ab79dd3e213ef745b6000c5 Author: Andy Delcambre Date: Mon Apr 14 15:41:34 2014 -0700 ! Add a README

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8a720fa HEAD, master Refs Commit

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yt $ echo "It's so awesome" >> README yt ✗ $ git add README yt ✗ $ git commit -m "Update README" [master ede0fc8] Update README 1 file changed, 1 insertion(+) yt $ git log --graph --decorate --pretty=oneline * ede0fc8 (HEAD, master) Update README * 8a720fa Add a README%

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Commit 8a720fa ede0fc8 HEAD, master Refs Commit

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yt $ git cat-file -p ede0fc8 tree 493fc85c806ebd9e49395561d2f9c98a5d9ebdce parent 8a720fa06710948f2ab79dd3e213ef745b6000c5 author Andy Delcambre 1397516385 -0700 committer Andy Delcambre 1397516385 -0700 ! Update README

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Commit ede0fc8 8a720fa 493fc85 Parent Tree

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yt $ git cat-file -p 493fc85 100644 blob 17ca828132ebdc5347f4c5c20484b9a33fffb294 README !

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Tree 493fc85 17ca828 Blob (README)

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yt $ git cat-file -p 17ca828 My sweet repo It's so awesome

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GitHub

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Secret:

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Hosting a Git repo is Secret:

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Hosting a Git repo is Secret: EASY

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enzo $ git init --bare demo.git Initialized empty Git repo in /home/adelcambre/git/demo.git/ ! yt $ git remote add origin adelcambre@enzo:git/demo.git yt $ git push origin master Counting objects: 6, done. Delta compression using up to 8 threads. Compressing objects: 100% (2/2), done. Writing objects: 100% (6/6), 473 bytes, done. Total 6 (delta 0), reused 6 (delta 0) To adelcambre@enzo:git/demo.git * [new branch] master -> master ! yt $ git clone adelcambre@enzo:git/demo.git Cloning into 'demo'... remote: Counting objects: 6, done. remote: Compressing objects: 100% (2/2), done. remote: Total 6 (delta 0), reused 0 (delta 0) Receiving objects: 100% (6/6), done.

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yt $ git remote add -f origin [email protected]:adelcambre/demo.git Updating origin From github.com:adelcambre/demo * [new branch] master -> origin/master ! yt $ git push origin master Counting objects: 6, done. Delta compression using up to 8 threads. Compressing objects: 100% (2/2), done. Writing objects: 100% (6/6), 473 bytes, done. Total 6 (delta 0), reused 6 (delta 0) To https://github.com/adelcambre/demo.git * [new branch] master -> master

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GitHub Flow

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Make a branch

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Add Commits

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Open a Pull Request

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Discuss & Code Review

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Merge and deploy

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Not so Secret:

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Hosting a *lot* of Git repos is Not so Secret:

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Hosting a *lot* of Git repos is Not so Secret: HARD

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> 7 million repositories

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1.5 million pushes

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100 million pulls & clones

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27 ﬁleservers

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100 TB of online storage

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Grit

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1st Commit GitHub

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1st Commit GitHub 1st Commit Grit

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Ruby wrapper around Git

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repo = Grit::Repo.new(“grit.git”) ! repo.commits # => [#, #, #, #, #]

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This works for everything! ! (locally)

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27 ﬁleservers

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Smoke “Grit in the cloud”

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The Internet Chimney fs102 fs103 fs104 fs105 … fe102 fe103 fe104 fe105 …

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The Internet Chimney fs102 fs103 fs104 fs105 … fe102 fe103 fe104 fe105 …

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The Internet Chimney fs102 fs103 fs104 fs105 … fe102 fe103 fe104 fe105 …

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The Internet Chimney fs102 fs103 fs104 fs105 … fe102 fe103 fe104 fe105 …

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The Internet Chimney fs102 fs103 fs104 fs105 … fe102 fe103 fe104 fe105 … BERTRPC

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module Smoke def self.install! ::Grit.send(:remove_const, :Git) ! ::Grit.const_set(:Git, Smoke::Git) end end

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repo.ls_tree("HEAD").each do | entry| if entry.blob? repo.load_blob(entry.oid) end end

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Death by Round Trip

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A condensed (and probably wrong) history of git

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Bitkeeper

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Git

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Shared library?

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libgit2

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JGit

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libgit2 http://github.com/libgit2/libgit2

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Rugged http://github.com/libgit2/rugged

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Ruby wrapper around libgit2

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repo = Rugged::Repository.new("rugged.git") ! repo.last_commit # => #

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GitRPC The New Hotness aka

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Like Smoke, But Better

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Caching

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Pluggable Wire Protocols

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Encoding Aware

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This is My Job

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education.github.com

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Questions! Git for Computer Scientists http://eagain.net/articles/git-for-computer-scientists/ My mom told me git doesn’t scale https://vimeo.com/64716825 GitHub Flow https://guides.github.com/introduction/ﬂow/index.html How GitHub uses GitHub to build Github http://zachholman.com/talk/how-github-uses-github-to-build-github/