dotcloud/docker

package kernel // import "github.com/docker/docker/pkg/parsers/kernel"

import (
    "fmt"

    "golang.org/x/sys/windows"
    "golang.org/x/sys/windows/registry"
)

// VersionInfo holds information about the kernel.
type VersionInfo struct {
    kvi   string // Version of the kernel (e.g. 6.1.7601.17592 -> 6)
    major int    // Major part of the kernel version (e.g. 6.1.7601.17592 -> 1)
    minor int    // Minor part of the kernel version (e.g. 6.1.7601.17592 -> 7601)
    build int    // Build number of the kernel version (e.g. 6.1.7601.17592 -> 17592)
}

func (k *VersionInfo) String() string {
    return fmt.Sprintf("%d.%d %d (%s)", k.major, k.minor, k.build, k.kvi)
}

// GetKernelVersion gets the current kernel version.
func GetKernelVersion() (*VersionInfo, error) {
    KVI := &VersionInfo{"Unknown", 0, 0, 0}

    k, err := registry.OpenKey(registry.LOCAL_MACHINE, `SOFTWARE\Microsoft\Windows NT\CurrentVersion`, registry.QUERY_VALUE)
    if err != nil {
        return KVI, err
    }
    defer k.Close()

    blex, _, err := k.GetStringValue("BuildLabEx")
    if err != nil {
        return KVI, err
    }
    KVI.kvi = blex

    // Important - dockerd.exe MUST be manifested for this API to return
    // the correct information.
    dwVersion, err := windows.GetVersion()
    if err != nil {
        return KVI, err
    }

    KVI.major = int(dwVersion & 0xFF)
    KVI.minor = int((dwVersion & 0xFF00) >> 8)
    KVI.build = int((dwVersion & 0xFFFF0000) >> 16)

    return KVI, nil
}