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Lifecycle-Platform Compatibility verification #67

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Jan 25, 2020
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Lifecycle-Platform Compatibility verification #67

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30 changes: 25 additions & 5 deletions platform.md
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Expand Up @@ -12,21 +12,41 @@ Examples of a platform might include:

## Table of Contents

1. [Stacks](#stacks)
1. [Platform API Version](#platform-api-version)
1. [Compatibility Verification](#compatibility-verification)
2. [Stacks](#stacks)
1. [Compatibility Guarantees](#compatibility-guarantees)
2. [Build Image](#build-image)
3. [Run Image](#run-image)
2. [Buildpacks](#buildpacks)
3. [Buildpacks](#buildpacks)
1. [Buildpacks Directory Layout](#buildpacks-directory-layout)
3. [Security Considerations](#security-considerations)
4. [Additional Guidance](#additional-guidance)
4. [Security Considerations](#security-considerations)
5. [Additional Guidance](#additional-guidance)
1. [Environment](#environment)
2. [Run Image Rebasing](#run-image-rebasing)
3. [Caching](#caching)
5. [Data Format](#data-format)
6. [Data Format](#data-format)
1. [order.toml (TOML)](#order.toml-(toml))
2. [group.toml (TOML)](#group.toml-(toml))


## Platform API Version

The Platform API version:
- MUST be in form `<major>.<minor>` or `<major>`, where `<major>` is equivalent to `<major>.0`
- MUST describe the implemented Platform API.
- SHALL indicate compatibility with a given lifecycle according to the following rules:
- When `<major>` is `0`, the platform is only compatible with lifecycles implementing that exact Platform API.
- When `<major>` is greater than `0`, the platforms is only compatible with lifecycles implementing platform API
`<major>.<minor>`, where `<major>` of the lifecycle equals `<major>` of the platform and `<minor>` of the lifecycle
is greater than or equal to `<minor>` of the platform.

### Compatibility Verification

The lifecycle SHALL verify compatibility if the environment variable `CNB_PLATFORM_API` is set. The value of this
environment variable MUST be the version of the Platform API the platform implements. Compatibility verification SHALL
NOT occur if this environment variable is not set. Compatibility verification SHALL occur before any other validation.

## Stacks

A **stack** is a contract defined by a base run OCI image and a base build OCI image that are only updated with security patches.
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