github.com/kaisenlinux/docker.io@v0.0.0-20230510090727-ea55db55fac7/engine/pkg/system/lcow.go (about)

     1  //go:build windows && !no_lcow
     2  // +build windows,!no_lcow
     3  
     4  package system // import "github.com/docker/docker/pkg/system"
     5  
     6  import (
     7  	"strings"
     8  
     9  	"github.com/Microsoft/hcsshim/osversion"
    10  	specs "github.com/opencontainers/image-spec/specs-go/v1"
    11  	"github.com/pkg/errors"
    12  )
    13  
    14  var (
    15  	// lcowSupported determines if Linux Containers on Windows are supported.
    16  	lcowSupported = false
    17  )
    18  
    19  // InitLCOW sets whether LCOW is supported or not. Requires RS5+
    20  func InitLCOW(experimental bool) {
    21  	if experimental && osversion.Build() >= osversion.RS5 {
    22  		lcowSupported = true
    23  	}
    24  }
    25  
    26  func LCOWSupported() bool {
    27  	return lcowSupported
    28  }
    29  
    30  // ValidatePlatform determines if a platform structure is valid.
    31  // TODO This is a temporary windows-only function, should be replaced by
    32  // comparison of worker capabilities
    33  func ValidatePlatform(platform specs.Platform) error {
    34  	if !IsOSSupported(platform.OS) {
    35  		return errors.Errorf("unsupported os %s", platform.OS)
    36  	}
    37  	return nil
    38  }
    39  
    40  // IsOSSupported determines if an operating system is supported by the host
    41  func IsOSSupported(os string) bool {
    42  	if strings.EqualFold("windows", os) {
    43  		return true
    44  	}
    45  	if LCOWSupported() && strings.EqualFold(os, "linux") {
    46  		return true
    47  	}
    48  	return false
    49  }