Implement RFC0051: Graceful Stack Upgrades

[ryanmoran]

RFC

Summary

All Paketo Buildpacks should support graceful stack upgrades between the current Bionic and Jammy stacks. For most buildpacks, this should not require any changes, but for some buildpacks, layers created in previous builds that would normally be reused should be recreated if the stack ID changes.

Supporting Buildpacks

• Implement RFC0052: Graceful Stack Upgrades dotnet-core#765
• Implement RFC0052: Graceful Stack Upgrades go#651
• Implement RFC0052: Graceful Stack Upgrades java#741
• Implement RFC0052: Graceful Stack Upgrades java-native-image#442
• Implement RFC0052: Graceful Stack Upgrades nodejs#636
• Implement RFC0052: Graceful Stack Upgrades php#572
• Implement RFC0052: Graceful Stack Upgrades python#509
• Implement RFC0052: Graceful Stack Upgrades ruby#819
• Implement RFC0052: Graceful Stack Upgrades web-servers#113

[robdimsdale]

Python is marked complete with no action taken. We could not find any situations where stack upgrades invalidated the cache, so we will not clear the cache on stack upgrades.

[fg-j]

Blocked on completion of Jammy support for PHP and Ruby.

[sophiewigmore]

All language families have been released with this functionality