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//
// Copyright (c) 2015-2024 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
//go:build linux
// +build linux
package kernel
import (
"fmt"
"os"
"regexp"
"strconv"
"strings"
"syscall"
)
var versionRegex = regexp.MustCompile(`^(\d+)\.(\d+).(\d+).*$`)
// VersionFromRelease converts a release string with format
// 4.4.2[-1] to a kernel version number in LINUX_VERSION_CODE format.
// That is, for kernel "a.b.c", the version number will be (a<<16 + b<<8 + c)
func VersionFromRelease(releaseString string) (uint32, error) {
versionParts := versionRegex.FindStringSubmatch(releaseString)
if len(versionParts) != 4 {
return 0, fmt.Errorf("got invalid release version %q (expected format '4.3.2-1')", releaseString)
}
major, err := strconv.Atoi(versionParts[1])
if err != nil {
return 0, err
}
minor, err := strconv.Atoi(versionParts[2])
if err != nil {
return 0, err
}
patch, err := strconv.Atoi(versionParts[3])
if err != nil {
return 0, err
}
return Version(major, minor, patch), nil
}
// Version implements KERNEL_VERSION equivalent macro
// #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + ((c) > 255 ? 255 : (c)))
func Version(major, minor, patch int) uint32 {
if patch > 255 {
patch = 255
}
out := major<<16 + minor<<8 + patch
return uint32(out)
}
func currentReleaseUname() (string, error) {
var buf syscall.Utsname
if err := syscall.Uname(&buf); err != nil {
return "", err
}
releaseString := strings.Trim(utsnameStr(buf.Release[:]), "\x00")
return releaseString, nil
}
func currentReleaseUbuntu() (string, error) {
procVersion, err := os.ReadFile("/proc/version_signature")
if err != nil {
return "", err
}
var u1, u2, releaseString string
_, err = fmt.Sscanf(string(procVersion), "%s %s %s", &u1, &u2, &releaseString)
if err != nil {
return "", err
}
return releaseString, nil
}
var debianVersionRegex = regexp.MustCompile(`.* SMP Debian (\d+\.\d+.\d+-\d+)(?:\+[[:alnum:]]*)?.*`)
func parseDebianRelease(str string) (string, error) {
match := debianVersionRegex.FindStringSubmatch(str)
if len(match) != 2 {
return "", fmt.Errorf("failed to parse kernel version from /proc/version: %s", str)
}
return match[1], nil
}
func currentReleaseDebian() (string, error) {
procVersion, err := os.ReadFile("/proc/version")
if err != nil {
return "", fmt.Errorf("error reading /proc/version: %s", err)
}
return parseDebianRelease(string(procVersion))
}
// CurrentRelease returns the current kernel release ensuring that
// ubuntu and debian release numbers are accurate.
func CurrentRelease() (string, error) {
// We need extra checks for Debian and Ubuntu as they modify
// the kernel version patch number for compatibility with
// out-of-tree modules. Linux perf tools do the same for Ubuntu
// systems: https://github.com/torvalds/linux/commit/d18acd15c
//
// See also:
// https://kernel-team.pages.debian.net/kernel-handbook/ch-versions.html
// https://wiki.ubuntu.com/Kernel/FAQ
version, err := currentReleaseUbuntu()
if err == nil {
return version, nil
}
version, err = currentReleaseDebian()
if err == nil {
return version, nil
}
return currentReleaseUname()
}
// CurrentVersion returns the current kernel version in
// LINUX_VERSION_CODE format (see VersionFromRelease())
func CurrentVersion() (uint32, error) {
release, err := CurrentRelease()
if err == nil {
return VersionFromRelease(release)
}
return 0, err
}
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