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lib.go
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lib.go
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// Copyright (c) 2019 Tigera, Inc. All rights reserved.
//
// 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 versionparse
import (
"fmt"
"io"
"io/ioutil"
"os"
"regexp"
version "github.com/hashicorp/go-version"
log "github.com/sirupsen/logrus"
)
var (
kernelVersionRegexp = regexp.MustCompile(`Linux version (\d+\.\d+\.\d+)`)
)
func MustParseVersion(v string) *version.Version {
ver, err := version.NewVersion(v)
if err != nil {
log.WithError(err).Panic("Failed to parse version.")
}
return ver
}
func GetKernelVersionReader() (io.Reader, error) {
return os.Open("/proc/version")
}
func GetKernelVersion(reader io.Reader) (*version.Version, error) {
kernVersion, err := ioutil.ReadAll(reader)
if err != nil {
log.WithError(err).Warn("Failed to read kernel version from reader")
return nil, err
}
s := string(kernVersion)
log.WithField("rawVersion", s).Debug("Raw kernel version")
matches := kernelVersionRegexp.FindStringSubmatch(s)
if len(matches) == 0 {
msg := "Failed to parse kernel version string"
log.WithField("rawVersion", s).Warn(msg)
return nil, fmt.Errorf("%s", msg)
}
parsedVersion, err := version.NewVersion(matches[1])
if err != nil {
msg := "Failed to parse kernel version"
log.WithField("rawVersion", s).WithError(err).Warn(msg)
return nil, fmt.Errorf("%s", msg)
}
log.WithField("version", parsedVersion).Debug("Parsed kernel version")
return parsedVersion, nil
}