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Multi-platform support #74

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Multi-platform support #74

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416321d
Multi-platform containers.
sladage Jul 24, 2015
4189cdd
Platform section is intended for the main config only.
sladage Jul 24, 2015
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16 changes: 11 additions & 5 deletions config.md
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Original file line number Diff line number Diff line change
Expand Up @@ -137,14 +137,20 @@ For Linux-based systems the user structure has the following fields:

## Platform-specific configuration

The *platforms* array should contain a list of platforms which the container supports. Only the main configuration file `config.json` may contain a *platforms* section.

* **os** (string, required) specifies the operating system family this image must run on. Values for os must be in the list specified by the Go Language document for [`$GOOS`](https://golang.org/doc/install/source#environment).
* **arch** (string, required) specifies the instruction set for which the binaries in the image have been compiled. Values for arch must be in the list specified by the Go Language document for [`$GOARCH`](https://golang.org/doc/install/source#environment).
* **config** (string, optional) specifies the config file containing platform-specific overrides and/or platform-specific sections. File path must be relative to the main config (`config.json`) file.

```json
"platform": {
"os": "linux",
"arch": "amd64"
}
"platforms": [
{
"os": "linux",
"arch": "amd64",
"config": "linux64.json"
}
]
```

Interpretation of the platform section of the JSON file is used to find which platform-specific sections may be available in the document. For example, if `os` is set to `linux`, then a JSON object conforming to the [Linux-specific schema](config-linux.md) SHOULD be found at the key `linux` in the `config.json`.
In this case a JSON object conforming to the [Linux-specific schema](config-linux.md) SHOULD be found at the key `linux` in the `linux64.json` config file.
9 changes: 5 additions & 4 deletions spec.go
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Expand Up @@ -5,8 +5,8 @@ package specs
type Spec struct {
// Version is the version of the specification that is supported.
Version string `json:"version"`
// Platform is the host information for OS and Arch.
Platform Platform `json:"platform"`
// Platforms supported by the container.
Platform []Platform `json:"platforms"`
// Process is the container's main process.
Process Process `json:"process"`
// Root is the root information for the container's filesystem.
Expand Down Expand Up @@ -53,11 +53,12 @@ type Root struct {
Readonly bool `json:"readonly"`
}

// Platform specifies OS and arch information for the host system that the container
// is created for.
// Platform specifies OS and arch information for the target host system.
type Platform struct {
// OS is the operating system.
OS string `json:"os"`
// Arch is the architecture
Arch string `json:"arch"`
// Configuration file containing platform-specific configurations.
Config string `json:"config"`
}