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// Copyright 2022 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package hostos contains utility functions for getting information about the host OS.
package hostos
import (
"fmt"
"regexp"
"strings"
"sync"
"golang.org/x/mod/semver"
"golang.org/x/sys/unix"
)
// Version represents a semantic version of the form "%d.%d[.%d]".
type Version struct {
version string
}
// AtLeast returns whether vr is at least version major.minor.
func (vr Version) AtLeast(major, minor int) bool {
return semver.Compare(vr.version, fmt.Sprintf("v%d.%d", major, minor)) >= 0
}
// LessThan returns whether vr is less than version major.minor.
func (vr Version) LessThan(major, minor int) bool {
return !vr.AtLeast(major, minor)
}
// String implements fmt.Stringer.
func (vr Version) String() string {
if vr.version == "" {
return "unknown"
}
// Omit the "v" prefix required by semver.
return vr.version[1:]
}
// These values are effectively local to KernelVersion, but kept here so as to
// work with sync.Once.
var (
semVersion Version
unameErr error
once sync.Once
)
// KernelVersion returns the version of the kernel using uname().
func KernelVersion() (Version, error) {
once.Do(func() {
var utsname unix.Utsname
if err := unix.Uname(&utsname); err != nil {
unameErr = err
return
}
var sb strings.Builder
for _, b := range utsname.Release {
if b == 0 {
break
}
sb.WriteByte(byte(b))
}
versionRegexp := regexp.MustCompile(`[0-9]+\.[0-9]+(\.[0-9]+)?`)
version := "v" + string(versionRegexp.Find([]byte(sb.String())))
if !semver.IsValid(version) {
unameErr = fmt.Errorf("invalid version found in release %q", sb.String())
return
}
semVersion.version = version
})
return semVersion, unameErr
}
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