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// Copyright 2015 Canonical Ltd.
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// Copyright 2015 Cloudbase Solutions SRL
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// Licensed under the AGPLv3, see LICENCE file for details.
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"github.com/gabriel-samfira/sys/windows/registry"
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"github.com/juju/errors"
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// currentVersionKey is defined as a variable instead of a constant
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// to allow overwriting during testing
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currentVersionKey = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion"
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// isNanoKey determines the registry key that can be queried to determine whether
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// a machine is a nano machine
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isNanoKey = "Software\\Microsoft\\Windows NT\\CurrentVersion\\Server\\ServerLevels"
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func getVersionFromRegistry() (string, error) {
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k, err := registry.OpenKey(registry.LOCAL_MACHINE, currentVersionKey, registry.QUERY_VALUE)
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return "", errors.Trace(err)
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s, _, err := k.GetStringValue("ProductName")
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return "", errors.Trace(err)
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func readSeries() (string, error) {
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ver, err := getVersionFromRegistry()
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return "unknown", errors.Trace(err)
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var lookAt = windowsVersions
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isNano, err := isWindowsNano()
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if err != nil && os.IsNotExist(err) {
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return "unknown", errors.Trace(err)
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lookAt = windowsNanoVersions
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for _, value := range windowsVersionMatchOrder {
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if strings.HasPrefix(ver, value) {
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if val, ok := lookAt[value]; ok {
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return "unknown", errors.Errorf("unknown series %q", ver)
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func isWindowsNano() (bool, error) {
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k, err := registry.OpenKey(registry.LOCAL_MACHINE, isNanoKey, registry.QUERY_VALUE)
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return false, errors.Trace(err)
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s, _, err := k.GetIntegerValue("NanoServer")
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return false, errors.Trace(err)