mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-29 21:15:39 +00:00
88 lines
2.0 KiB
Go
88 lines
2.0 KiB
Go
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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build linux,!android
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package controlclient
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"strings"
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"syscall"
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"go4.org/mem"
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"tailscale.com/util/lineread"
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)
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func init() {
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osVersion = osVersionLinux
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}
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func osVersionLinux() string {
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m := map[string]string{}
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lineread.File("/etc/os-release", func(line []byte) error {
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eq := bytes.IndexByte(line, '=')
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if eq == -1 {
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return nil
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}
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k, v := string(line[:eq]), strings.Trim(string(line[eq+1:]), `"`)
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m[k] = v
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return nil
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})
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var un syscall.Utsname
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syscall.Uname(&un)
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var attrBuf strings.Builder
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attrBuf.WriteString("; kernel=")
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for _, b := range un.Release {
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if b == 0 {
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break
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}
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attrBuf.WriteByte(byte(b))
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}
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if inContainer() {
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attrBuf.WriteString("; container")
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}
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attr := attrBuf.String()
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id := m["ID"]
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switch id {
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case "debian":
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slurp, _ := ioutil.ReadFile("/etc/debian_version")
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return fmt.Sprintf("Debian %s (%s)%s", bytes.TrimSpace(slurp), m["VERSION_CODENAME"], attr)
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case "ubuntu":
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return fmt.Sprintf("Ubuntu %s%s", m["VERSION"], attr)
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case "", "centos": // CentOS 6 has no /etc/os-release, so its id is ""
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if cr, _ := ioutil.ReadFile("/etc/centos-release"); len(cr) > 0 { // "CentOS release 6.10 (Final)
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return fmt.Sprintf("%s%s", bytes.TrimSpace(cr), attr)
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}
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fallthrough
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case "fedora", "rhel", "alpine":
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// Their PRETTY_NAME is fine as-is for all versions I tested.
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fallthrough
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default:
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if v := m["PRETTY_NAME"]; v != "" {
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return fmt.Sprintf("%s%s", v, attr)
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}
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}
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return fmt.Sprintf("Other%s", attr)
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}
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func inContainer() (ret bool) {
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lineread.File("/proc/1/cgroup", func(line []byte) error {
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if mem.Contains(mem.B(line), mem.S("/docker/")) ||
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mem.Contains(mem.B(line), mem.S("/lxc/")) {
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ret = true
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return io.EOF // arbitrary non-nil error to stop loop
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}
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return nil
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})
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return
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}
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