95 lines
2.3 KiB
Go
95 lines
2.3 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package platforms
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import (
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"fmt"
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"runtime"
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"strconv"
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"strings"
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specs "github.com/opencontainers/image-spec/specs-go/v1"
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"golang.org/x/sys/windows"
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)
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// DefaultSpec returns the current platform's default platform specification.
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func DefaultSpec() specs.Platform {
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major, minor, build := windows.RtlGetNtVersionNumbers()
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return specs.Platform{
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OS: runtime.GOOS,
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Architecture: runtime.GOARCH,
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OSVersion: fmt.Sprintf("%d.%d.%d", major, minor, build),
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// The Variant field will be empty if arch != ARM.
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Variant: cpuVariant(),
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}
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}
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type windowsmatcher struct {
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specs.Platform
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osVersionPrefix string
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defaultMatcher Matcher
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}
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// Match matches platform with the same windows major, minor
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// and build version.
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func (m windowsmatcher) Match(p specs.Platform) bool {
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match := m.defaultMatcher.Match(p)
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if match && m.OS == "windows" {
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return strings.HasPrefix(p.OSVersion, m.osVersionPrefix) && m.defaultMatcher.Match(p)
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}
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return match
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}
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// Less sorts matched platforms in front of other platforms.
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// For matched platforms, it puts platforms with larger revision
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// number in front.
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func (m windowsmatcher) Less(p1, p2 specs.Platform) bool {
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m1, m2 := m.Match(p1), m.Match(p2)
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if m1 && m2 {
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r1, r2 := revision(p1.OSVersion), revision(p2.OSVersion)
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return r1 > r2
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}
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return m1 && !m2
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}
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func revision(v string) int {
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parts := strings.Split(v, ".")
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if len(parts) < 4 {
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return 0
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}
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r, err := strconv.Atoi(parts[3])
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if err != nil {
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return 0
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}
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return r
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}
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func prefix(v string) string {
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parts := strings.Split(v, ".")
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if len(parts) < 4 {
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return v
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}
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return strings.Join(parts[0:3], ".")
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}
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// Default returns the current platform's default platform specification.
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func Default() MatchComparer {
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return Only(DefaultSpec())
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}
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