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133 lines
5.5 KiB
Markdown
133 lines
5.5 KiB
Markdown
# RFC 008: Constellation APIs (v1)
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## Base
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The API base starts with `constellation` followed by the API version.
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At this moment, the only valid API version is `v1`:
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```
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/constellation/v1/
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```
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## API groups
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The API version is followed by the API group. Possible values are:
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- [`versions`: version information for Constellation components](007-version-api.md)
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- [`image`: metadata for individual Constellation OS images](009-image-api.md)
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- `info`: image reference lookup for each cloud provider and additional metadata
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- `measurements`: TPM measurements for Constellation OS images
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- `raw`: raw OS images
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- `sbom`: SBOMs for Constellation OS images
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There may be more API groups in the future (e.g. `cli`)
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## API paths overview
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- [`/constellation/v1/ref/<ref>/stream/<stream>/versions/latest/<kind>.json`](007-version-api.md#latest)
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- [`/constellation/v1/ref/<ref>/stream/<stream>/versions/major/<base>/<kind>.json`](007-version-api.md#major-to-minor-version-list)
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- [`/constellation/v1/ref/<ref>/stream/<stream>/versions/minor/<base>/<kind>.json`](007-version-api.md#minor-to-patch-version-list)
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- [`/constellation/v1/ref/<ref>/stream/<stream>/<version>/image/info.json`](009-image-api.md#image-lookup-table)
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- [`/constellation/v1/ref/<ref>/stream/<stream>/<version>/image/sbom.<format>.json`](009-image-api.md)
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- [`/constellation/v1/ref/<ref>/stream/<stream>/<version>/image/csp/<csp>/measurements.json`](009-image-api.md)
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- [`/constellation/v1/ref/<ref>/stream/<stream>/<version>/image/csp/<csp>/measurements.json.sig`](009-image-api.md)
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- [`/constellation/v1/ref/<ref>/stream/<stream>/<version>/image/csp/<csp>/image.raw`](009-image-api.md)
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- [`/constellation/v1/ref/<ref>/stream/<stream>/<version>/cli/info.json`](010-cli-api.md#cli-lookup-table)
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## API path identifiers `ref`, `stream` and `version`
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### Meaning of `ref`, `stream` and `version` for resource names
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Components in this API are identified by `ref`, `stream` and `version`.
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- a `ref` that is either a normalized git branch name or the special value `-`. Defaults to `-`.
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- a `stream` that determines the specific type of the resource. Defaults to `stable`.
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- a `version` that is a semantic version.
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The special `ref` value `-` (dash) is reserved for releases. Every other value is a branch name where special characters are replaced by dashes.
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Streams are used to distinguish different types of resources. Depending on the kind of resource and `ref`, only a subset of values might be allowed.
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The `version` is always a valid semantic version. For the special stream `stable` it is guaranteed to be a semantic version `v<major>.<minor>.<patch>`,
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for other stream values, it is a semantic version that may contain a suffix after the patch: `v<major>.<minor>.<patch>-<suffix>`.
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The use of semantic versions and pseudo versions tries to match the versioning used in Go. If in doubt,
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consult the module reference of Go, especially the sections about [versions](https://go.dev/ref/mod#versions)
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and [pseudo-versions](https://go.dev/ref/mod#pseudo-versions).
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The [workspace status tool](/tools/workspace_status.sh) can generate a valid pseudo-version for your current head.
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### Consistent API path prefix of `ref` and `stream`
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For API calls, paths will always start with `ref` and `stream`:
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```
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<base>/ref/<ref>/stream/<stream>/
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```
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### Meaning of `ref` and `stream` for images
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The special value `-` (dash) for images is used for releases. They are always built from the corresponding release branch (and tag).
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Every other value refers to a normalized branch name.
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For the `ref` `-` (dash), the `stream` value can be one of the following constants:
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- `stable`: Built with default settings (non-debug), for end users and with all security features enabled
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- `console`: Built with default settings (non-debug), allows access to the serial console
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- `debug`: Image containing the debugd, allows access to the serial console
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For other `ref` values, the `stream` value can be one of the following constants:
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- `nightly`: Built with default settings (non-debug), with all security features enabled
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- `console`: Built with default settings (non-debug), allows access to the serial console
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- `debug`: Image containing the debugd, allows access to the serial console
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## Short paths for resource identification
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Short paths allow an easier version handling, e.g., in end user configuration files or CLI tools.
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When using the default values, short paths omit either the `ref` (if set to `-`) or the `ref` and `stream`
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parts (if set to `-` and `stable`):
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- `ref/-/stream/stable/<version>` is equivalent to the short path `<version>`
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- `ref/-/stream/<stream>/<version>` is equivalent to the short path `stream/<stream>/<version>`
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Resource group can be identified by `ref/<ref>/stream/<stream>/<version>` and allow for short form encoding as explained above.
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Resources using this encoding include:
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- `version`: version information for Constellation components
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- `image`: metadata for individual Constellation OS images
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## Examples
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Release v2.3.0 would use the following image name for the default, end-user image:
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```
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short form: v2.3.0
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long form: ref/-/stream/stable/v2.3.0
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```
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A debug image created from the same release:
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```
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short form: stream/debug/v2.3.0
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long form: ref/-/stream/debug/v2.3.0
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```
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A debug image on the branch `feat/xyz`:
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```
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ref/feat-xyz/stream/debug/v2.4.0-pre.0.20230922011244-0744d001aa84
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```
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A nightly image on `main`:
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```
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ref/main/stream/nightly/v2.4.0-pre.0.20230922011244-0744d001aa84
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```
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A debug image on `main`:
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```
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ref/main/stream/debug/v2.4.0-pre.0.20230922011244-0744d001aa84
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```
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