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tailscale/hostinfo/hostinfo_linux.go

170 lines
4.1 KiB
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
//go:build linux && !android
package hostinfo
import (
"bytes"
"os"
"strings"
"golang.org/x/sys/unix"
"tailscale.com/types/ptr"
"tailscale.com/util/lineread"
"tailscale.com/util/strs"
"tailscale.com/version/distro"
)
func init() {
osVersion = lazyOSVersion.Get
packageType = packageTypeLinux
distroName = distroNameLinux
distroVersion = distroVersionLinux
distroCodeName = distroCodeNameLinux
if v := linuxDeviceModel(); v != "" {
SetDeviceModel(v)
}
}
var (
lazyVersionMeta = &lazyAtomicValue[versionMeta]{f: ptr.To(linuxVersionMeta)}
lazyOSVersion = &lazyAtomicValue[string]{f: ptr.To(osVersionLinux)}
)
type versionMeta struct {
DistroName string
DistroVersion string
DistroCodeName string // "jammy", etc (VERSION_CODENAME from /etc/os-release)
}
func distroNameLinux() string {
return lazyVersionMeta.Get().DistroName
}
func distroVersionLinux() string {
return lazyVersionMeta.Get().DistroVersion
}
func distroCodeNameLinux() string {
return lazyVersionMeta.Get().DistroCodeName
}
func linuxDeviceModel() string {
for _, path := range []string{
// First try the Synology-specific location.
// Example: "DS916+-j"
"/proc/sys/kernel/syno_hw_version",
// Otherwise, try the Devicetree model, usually set on
// ARM SBCs, etc.
// Example: "Raspberry Pi 4 Model B Rev 1.2"
// Example: "WD My Cloud Gen2: Marvell Armada 375"
"/sys/firmware/devicetree/base/model", // Raspberry Pi 4 Model B Rev 1.2"
} {
b, _ := os.ReadFile(path)
if s := strings.Trim(string(b), "\x00\r\n\t "); s != "" {
return s
}
}
return ""
}
func getQnapQtsVersion(versionInfo string) string {
for _, field := range strings.Fields(versionInfo) {
if suffix, ok := strs.CutPrefix(field, "QTSFW_"); ok {
return suffix
}
}
return ""
}
func osVersionLinux() string {
var un unix.Utsname
unix.Uname(&un)
return unix.ByteSliceToString(un.Release[:])
}
func linuxVersionMeta() (meta versionMeta) {
dist := distro.Get()
meta.DistroName = string(dist)
propFile := "/etc/os-release"
switch dist {
case distro.Synology:
propFile = "/etc.defaults/VERSION"
case distro.OpenWrt:
propFile = "/etc/openwrt_release"
case distro.WDMyCloud:
slurp, _ := os.ReadFile("/etc/version")
meta.DistroVersion = string(bytes.TrimSpace(slurp))
return
case distro.QNAP:
slurp, _ := os.ReadFile("/etc/version_info")
meta.DistroVersion = getQnapQtsVersion(string(slurp))
return
}
m := map[string]string{}
lineread.File(propFile, func(line []byte) error {
eq := bytes.IndexByte(line, '=')
if eq == -1 {
return nil
}
k, v := string(line[:eq]), strings.Trim(string(line[eq+1:]), `"'`)
m[k] = v
return nil
})
if v := m["VERSION_CODENAME"]; v != "" {
meta.DistroCodeName = v
}
if v := m["VERSION_ID"]; v != "" {
meta.DistroVersion = v
}
id := m["ID"]
if id != "" {
meta.DistroName = id
}
switch id {
case "debian":
// Debian's VERSION_ID is just like "11". But /etc/debian_version has "11.5" normally.
// Or "bookworm/sid" on sid/testing.
slurp, _ := os.ReadFile("/etc/debian_version")
if v := string(bytes.TrimSpace(slurp)); v != "" {
if '0' <= v[0] && v[0] <= '9' {
meta.DistroVersion = v
} else if meta.DistroCodeName == "" {
meta.DistroCodeName = v
}
}
case "", "centos": // CentOS 6 has no /etc/os-release, so its id is ""
if meta.DistroVersion == "" {
if cr, _ := os.ReadFile("/etc/centos-release"); len(cr) > 0 { // "CentOS release 6.10 (Final)
meta.DistroVersion = string(bytes.TrimSpace(cr))
}
}
}
if v := m["PRETTY_NAME"]; v != "" && meta.DistroVersion == "" && !strings.HasSuffix(v, "/sid") {
meta.DistroVersion = v
}
switch dist {
case distro.Synology:
meta.DistroVersion = m["productversion"]
case distro.OpenWrt:
meta.DistroVersion = m["DISTRIB_RELEASE"]
}
return
}
func packageTypeLinux() string {
// Report whether this is in a snap.
// See https://snapcraft.io/docs/environment-variables
// We just look at two somewhat arbitrarily.
if os.Getenv("SNAP_NAME") != "" && os.Getenv("SNAP") != "" {
return "snap"
}
return ""
}