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CONTRIBUTING.md: Replace staging workflow diagram

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Can't be rendered in GitHub markdown, replacing it with a Git branch diagram using mermaid
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Silvan Mosberger 2023-08-04 22:49:53 +02:00
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CONTRIBUTING.md
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@ -157,30 +157,52 @@ branch allows the Hydra operators to batch groups of commits to
separate from `staging`, this batching does not block
developers from merging changes into `staging`.
```{.graphviz caption="Staging workflow"}
digraph {
master [color="green" fontcolor=green]
"staging-next" [color="green" fontcolor=green]
staging [color="red" fontcolor=red]
"small changes" [fontcolor=green shape=none]
"small changes" -> master [color=green]
"mass-rebuilds and other large changes" [fontcolor=red shape=none]
"mass-rebuilds and other large changes" -> staging [color=red]
"critical security fixes" [fontcolor=green shape=none]
"critical security fixes" -> master [color=green]
"staging fixes which do not cause staging to mass-rebuild" [fontcolor=green shape=none]
"staging fixes which do not cause staging to mass-rebuild" -> "staging-next" [color=green]
"staging-next" -> master [color="red"] [label="manual merge"] [fontcolor="red"]
"staging" -> "staging-next" [color="red"] [label="manual merge"] [fontcolor="red"]
master -> "staging-next" [color="green"] [label="automatic merge (GitHub Action)"] [fontcolor="green"]
"staging-next" -> staging [color="green"] [label="automatic merge (GitHub Action)"] [fontcolor="green"]
```mermaid
%%{init: {
'theme': 'base',
'themeVariables': {
'gitInv0': '#ff0000',
'gitInv1': '#ff0000',
'git2': '#ff4444',
'commitLabelFontSize': '15px'
},
'gitGraph': {
'showCommitLabel':true,
'mainBranchName': 'master',
'rotateCommitLabel': true
}
} }%%
gitGraph
commit id:" "
branch staging-next
branch staging
checkout master
checkout staging
checkout master
commit id:" "
checkout staging-next
merge master id:"automatic"
checkout staging
merge staging-next id:"automatic "
checkout staging-next
merge staging type:HIGHLIGHT id:"manual"
commit id:"fixup"
checkout master
checkout staging
checkout master
commit id:" "
checkout staging-next
merge master id:"automatic "
checkout staging
merge staging-next id:"automatic "
checkout staging-next
commit id:"fixup "
checkout master
merge staging-next type:HIGHLIGHT id:"manual (PR)"
```
[This GitHub Action](https://github.com/NixOS/nixpkgs/blob/master/.github/workflows/periodic-merge-6h.yml) brings changes from `master` to `staging-next` and from `staging-next` to `staging` every 6 hours; these are the green arrows in the diagram above. The red arrows in the diagram above are done manually and much less frequently. You can get an idea of how often these merges occur by looking at the git history.