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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
//go:build linux
package tstest
import (
"strconv"
"strings"
"golang.org/x/sys/unix"
)
// KernelVersion returns the major, minor, and patch version of the Linux kernel.
// It returns (0, 0, 0) if the version cannot be determined.
func KernelVersion() (major, minor, patch int) {
var uname unix.Utsname
if err := unix.Uname(&uname); err != nil {
return 0, 0, 0
}
release := unix.ByteSliceToString(uname.Release[:])
return parseKernelVersion(release)
}
// parseKernelVersion parses a Linux kernel version string like "6.12.73+deb13-amd64"
// or "5.15.0-76-generic" and returns the major, minor, and patch components.
// It returns (0, 0, 0) if the version cannot be parsed.
func parseKernelVersion(release string) (major, minor, patch int) {
parts := strings.Split(release, ".")
if len(parts) < 3 {
return 0, 0, 0
}
major, err := strconv.Atoi(parts[0])
if err != nil {
return 0, 0, 0
}
minor, err = strconv.Atoi(parts[1])
if err != nil {
return 0, 0, 0
}
// Patch version may have additional info after a hyphen or plus (e.g., "0-76-generic" or "41+deb13-amd64")
// Extract just the numeric part before any hyphen or plus
patchStr := parts[2]
if idx := strings.IndexAny(patchStr, "-+"); idx != -1 {
patchStr = patchStr[:idx]
}
patch, err = strconv.Atoi(patchStr)
if err != nil {
return 0, 0, 0
}
return major, minor, patch
}
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