Git deep dive – chopping Kubernetes

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Stefan Schimanski

Filtering the Kubernetes repo by (staging) directory, while rewriting commits to include valid Godeps.jsons.

Software

Chopping Kubernetes —
a git deep dive
Dr. Stefan Schimanski
sttts@redhat.com — @the_sttts — github.com/sttts

• monorepo github.com/kubernetes/kubernetes
• embedded staging repos
• github.com/kubernetes/api
• github.com/kubernetes/apimachinery
• github.com/kubernetes/apiserver
• github.com/kubernetes/client-go
• ...
• published nightly with tags, branches
• rewriting Godeps.json
• Kubernetes-commit: <sha1>

$ git cat-file –p HEAD
tree 4a541f0a3b26ab7ef8eb38090072558cd8aa54cd
parent 3667154d8524e58db0e21b9338f335f5c53dd83e
parent 951d2c060e0fa173f82bc221e388f9491709c52c
author Kubernetes Submit Queue <k8s-merge-robot@users.noreply.github.com> 1508409674 -0700
committer GitHub <noreply@github.com> 1508409674 -0700
Merge pull request #54192 from mkumatag/versioned_busybox

$ git hash-object –w <filename> # Copy into repository
<blob-sha>
$ git update-index --add --cacheinfo 100644 <blob-sha> <filename>
$ git write-tree
<tree-sha>
$ git commit-tree -p <parent-sha> -m “Commit message“ <tree-sha>
<commit-sha>

git filter-branch --subdirectory-filter staging/src/k8s.io/client-go

Using Go instead of bash
• Native (non-cgo) go library: https://github.com/src-d/go-git
• Rewritten “git filter-branch“ to not drop ff-merges
• Do we need cherry-picks?

Links
• Git Internals: https://git-scm.com/book/en/v2/Git-Internals-Git-
Objects
• Native (non-cgo) go library: https://github.com/src-d/go-git

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Git deep dive – chopping Kubernetes

1. Chopping Kubernetes — a git deep dive Dr. Stefan Schimanski sttts@redhat.com — @the_sttts — github.com/sttts

2. • monorepo github.com/kubernetes/kubernetes • embedded staging repos • github.com/kubernetes/api • github.com/kubernetes/apimachinery • github.com/kubernetes/apiserver • github.com/kubernetes/client-go • ... • published nightly with tags, branches • rewriting Godeps.json • Kubernetes-commit: <sha1>

6. $ git cat-file –p HEAD tree 4a541f0a3b26ab7ef8eb38090072558cd8aa54cd parent 3667154d8524e58db0e21b9338f335f5c53dd83e parent 951d2c060e0fa173f82bc221e388f9491709c52c author Kubernetes Submit Queue <k8s-merge-robot@users.noreply.github.com> 1508409674 -0700 committer GitHub <noreply@github.com> 1508409674 -0700 Merge pull request #54192 from mkumatag/versioned_busybox

8. $ git hash-object –w <filename> # Copy into repository <blob-sha> $ git update-index --add --cacheinfo 100644 <blob-sha> <filename> $ git write-tree <tree-sha> $ git commit-tree -p <parent-sha> -m “Commit message“ <tree-sha> <commit-sha>

10.

11.

12.

13.

14. • monorepo github.com/kubernetes/kubernetes • embedded staging repos • github.com/kubernetes/api • github.com/kubernetes/apimachinery • github.com/kubernetes/apiserver • github.com/kubernetes/client-go • ... • published nightly with tags, branches • rewriting Godeps.json • Kubernetes-commit: <sha1>

15. git filter-branch --subdirectory-filter staging/src/k8s.io/client-go

16. git filter-branch --subdirectory-filter staging/src/k8s.io/client-go

17. git filter-branch --subdirectory-filter staging/src/k8s.io/client-go

18. git filter-branch --subdirectory-filter staging/src/k8s.io/client-go

19.

20. Using Go instead of bash • Native (non-cgo) go library: https://github.com/src-d/go-git • Rewritten “git filter-branch“ to not drop ff-merges • Do we need cherry-picks?

21.

22. Links • Git Internals: https://git-scm.com/book/en/v2/Git-Internals-Git- Objects • Native (non-cgo) go library: https://github.com/src-d/go-git

Git deep dive – chopping Kubernetes

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