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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
// Package distro reports which distro we're running on.
package distro
import (
"bytes"
"os"
"runtime"
"strconv"
"strings"
"tailscale.com/types/lazy"
"tailscale.com/util/lineiter"
)
type Distro string
const (
Debian = Distro("debian")
Arch = Distro("arch")
Synology = Distro("synology")
OpenWrt = Distro("openwrt")
NixOS = Distro("nixos")
QNAP = Distro("qnap")
Pfsense = Distro("pfsense")
OPNsense = Distro("opnsense")
TrueNAS = Distro("truenas")
Gokrazy = Distro("gokrazy")
WDMyCloud = Distro("wdmycloud")
Unraid = Distro("unraid")
Alpine = Distro("alpine")
UBNT = Distro("ubnt") // Ubiquiti Networks
JetKVM = Distro("jetkvm")
)
var distro lazy.SyncValue[Distro]
var isWSL lazy.SyncValue[bool]
// Get returns the current distro, or the empty string if unknown.
func Get() Distro {
return distro.Get(func() Distro {
switch runtime.GOOS {
case "linux":
return linuxDistro()
case "freebsd":
return freebsdDistro()
default:
return Distro("")
}
})
}
// IsWSL reports whether we're running in the Windows Subsystem for Linux.
func IsWSL() bool {
return runtime.GOOS == "linux" && isWSL.Get(func() bool {
// We could look for $WSL_INTEROP instead, however that may be missing if
// the user has started to use systemd in WSL2.
return have("/proc/sys/fs/binfmt_misc/WSLInterop") || have("/mnt/wsl")
})
}
func have(file string) bool {
_, err := os.Stat(file)
return err == nil
}
func haveDir(file string) bool {
fi, err := os.Stat(file)
return err == nil && fi.IsDir()
}
func linuxDistro() Distro {
switch {
case haveDir("/usr/syno"):
return Synology
case have("/usr/local/bin/freenas-debug"):
// TrueNAS Scale runs on debian
return TrueNAS
case have("/usr/bin/ubnt-device-info"):
// UBNT runs on Debian-based systems. This MUST be checked before Debian.
//
// Currently supported product families:
// - UDM (UniFi Dream Machine, UDM-Pro)
return UBNT
case have("/etc/debian_version"):
return Debian
case have("/etc/arch-release"):
return Arch
case have("/etc/openwrt_version"):
return OpenWrt
case have("/run/current-system/sw/bin/nixos-version"):
return NixOS
case have("/etc/config/uLinux.conf"):
return QNAP
case haveDir("/gokrazy"):
return Gokrazy
case have("/usr/local/wdmcserver/bin/wdmc.xml"): // Western Digital MyCloud OS3
return WDMyCloud
case have("/usr/sbin/wd_crontab.sh"): // Western Digital MyCloud OS5
return WDMyCloud
case have("/etc/unraid-version"):
return Unraid
case have("/etc/alpine-release"):
return Alpine
case runtime.GOARCH == "arm" && isDeviceModel("JetKVM"):
return JetKVM
}
return ""
}
func isDeviceModel(want string) bool {
if runtime.GOOS != "linux" {
return false
}
v, _ := os.ReadFile("/sys/firmware/devicetree/base/model")
return want == strings.Trim(string(v), "\x00\r\n\t ")
}
func freebsdDistro() Distro {
switch {
case have("/etc/pfSense-rc"):
return Pfsense
case have("/usr/local/sbin/opnsense-shell"):
return OPNsense
case have("/usr/local/bin/freenas-debug"):
// TrueNAS Core runs on FreeBSD
return TrueNAS
}
return ""
}
var dsmVersion lazy.SyncValue[int]
// DSMVersion reports the Synology DSM major version.
//
// If not Synology, it reports 0.
func DSMVersion() int {
if runtime.GOOS != "linux" {
return 0
}
return dsmVersion.Get(func() int {
if Get() != Synology {
return 0
}
// This is set when running as a package:
v, _ := strconv.Atoi(os.Getenv("SYNOPKG_DSM_VERSION_MAJOR"))
if v != 0 {
return v
}
// But when run from the command line, we have to read it from the file:
for lr := range lineiter.File("/etc/VERSION") {
line, err := lr.Value()
if err != nil {
break // but otherwise ignore
}
line = bytes.TrimSpace(line)
if string(line) == `majorversion="7"` {
return 7
}
if string(line) == `majorversion="6"` {
return 6
}
}
return 0
})
}
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