tailscale/hostinfo/hostinfo_linux.go

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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build linux && !android
// +build linux,!android
package hostinfo
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"strings"
"golang.org/x/sys/unix"
"tailscale.com/util/lineread"
"tailscale.com/version/distro"
)
func init() {
osVersion = osVersionLinux
packageType = packageTypeLinux
if v := linuxDeviceModel(); v != "" {
SetDeviceModel(v)
}
}
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 osVersionLinux() string {
dist := distro.Get()
propFile := "/etc/os-release"
switch dist {
case distro.Synology:
propFile = "/etc.defaults/VERSION"
case distro.OpenWrt:
propFile = "/etc/openwrt_release"
case distro.WDMyCloud:
slurp, _ := ioutil.ReadFile("/etc/version")
return fmt.Sprintf("%s", string(bytes.TrimSpace(slurp)))
}
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
})
var un unix.Utsname
unix.Uname(&un)
var attrBuf strings.Builder
attrBuf.WriteString("; kernel=")
attrBuf.WriteString(unix.ByteSliceToString(un.Release[:]))
if inContainer() {
attrBuf.WriteString("; container")
}
if env := GetEnvType(); env != "" {
fmt.Fprintf(&attrBuf, "; env=%s", env)
}
attr := attrBuf.String()
id := m["ID"]
switch id {
case "debian":
slurp, _ := ioutil.ReadFile("/etc/debian_version")
return fmt.Sprintf("Debian %s (%s)%s", bytes.TrimSpace(slurp), m["VERSION_CODENAME"], attr)
case "ubuntu":
return fmt.Sprintf("Ubuntu %s%s", m["VERSION"], attr)
case "", "centos": // CentOS 6 has no /etc/os-release, so its id is ""
if cr, _ := ioutil.ReadFile("/etc/centos-release"); len(cr) > 0 { // "CentOS release 6.10 (Final)
return fmt.Sprintf("%s%s", bytes.TrimSpace(cr), attr)
}
fallthrough
case "fedora", "rhel", "alpine", "nixos":
// Their PRETTY_NAME is fine as-is for all versions I tested.
fallthrough
default:
if v := m["PRETTY_NAME"]; v != "" {
return fmt.Sprintf("%s%s", v, attr)
}
}
switch dist {
case distro.Synology:
return fmt.Sprintf("Synology %s%s", m["productversion"], attr)
case distro.OpenWrt:
return fmt.Sprintf("OpenWrt %s%s", m["DISTRIB_RELEASE"], attr)
case distro.Gokrazy:
return fmt.Sprintf("Gokrazy%s", attr)
}
return fmt.Sprintf("Other%s", attr)
}
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 ""
}