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moby--moby/pkg/system/lcow.go
Daniel Nephin 4f0d95fa6e Add canonical import comment
Signed-off-by: Daniel Nephin <dnephin@docker.com>
2018-02-05 16:51:57 -05:00

69 lines
2.1 KiB
Go

package system // import "github.com/docker/docker/pkg/system"
import (
"fmt"
"runtime"
"strings"
specs "github.com/opencontainers/image-spec/specs-go/v1"
)
// ValidatePlatform determines if a platform structure is valid.
// TODO This is a temporary function - can be replaced by parsing from
// https://github.com/containerd/containerd/pull/1403/files at a later date.
// @jhowardmsft
func ValidatePlatform(platform *specs.Platform) error {
platform.Architecture = strings.ToLower(platform.Architecture)
platform.OS = strings.ToLower(platform.OS)
// Based on https://github.com/moby/moby/pull/34642#issuecomment-330375350, do
// not support anything except operating system.
if platform.Architecture != "" {
return fmt.Errorf("invalid platform architecture %q", platform.Architecture)
}
if platform.OS != "" {
if !(platform.OS == runtime.GOOS || (LCOWSupported() && platform.OS == "linux")) {
return fmt.Errorf("invalid platform os %q", platform.OS)
}
}
if len(platform.OSFeatures) != 0 {
return fmt.Errorf("invalid platform osfeatures %q", platform.OSFeatures)
}
if platform.OSVersion != "" {
return fmt.Errorf("invalid platform osversion %q", platform.OSVersion)
}
if platform.Variant != "" {
return fmt.Errorf("invalid platform variant %q", platform.Variant)
}
return nil
}
// ParsePlatform parses a platform string in the format os[/arch[/variant]
// into an OCI image-spec platform structure.
// TODO This is a temporary function - can be replaced by parsing from
// https://github.com/containerd/containerd/pull/1403/files at a later date.
// @jhowardmsft
func ParsePlatform(in string) *specs.Platform {
p := &specs.Platform{}
elements := strings.SplitN(strings.ToLower(in), "/", 3)
if len(elements) == 3 {
p.Variant = elements[2]
}
if len(elements) >= 2 {
p.Architecture = elements[1]
}
if len(elements) >= 1 {
p.OS = elements[0]
}
return p
}
// IsOSSupported determines if an operating system is supported by the host
func IsOSSupported(os string) bool {
if runtime.GOOS == os {
return true
}
if LCOWSupported() && os == "linux" {
return true
}
return false
}