100 lines
2.5 KiB
Go
100 lines
2.5 KiB
Go
// Copyright © 2016 Zlatko Čalušić
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//
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// Use of this source code is governed by an MIT-style license that can be found in the LICENSE file.
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package sysinfo
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import (
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"bufio"
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"os"
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"strings"
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)
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// Node information.
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type Node struct {
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Hostname string `json:"hostname,omitempty"`
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MachineID string `json:"machineid,omitempty"`
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Hypervisor string `json:"hypervisor,omitempty"`
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Timezone string `json:"timezone,omitempty"`
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}
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func (si *SysInfo) getHostname() {
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si.Node.Hostname = slurpFile("/proc/sys/kernel/hostname")
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}
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func (si *SysInfo) getSetMachineID() {
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const pathSystemdMachineID = "/etc/machine-id"
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const pathDbusMachineID = "/var/lib/dbus/machine-id"
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systemdMachineID := slurpFile(pathSystemdMachineID)
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dbusMachineID := slurpFile(pathDbusMachineID)
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if systemdMachineID != "" && dbusMachineID != "" {
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// All OK, just return the machine id.
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if systemdMachineID == dbusMachineID {
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si.Node.MachineID = systemdMachineID
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return
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}
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// They both exist, but they don't match! Copy systemd machine id to DBUS machine id.
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spewFile(pathDbusMachineID, systemdMachineID, 0444)
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si.Node.MachineID = systemdMachineID
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return
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}
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// Copy DBUS machine id to non-existent systemd machine id.
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if systemdMachineID == "" && dbusMachineID != "" {
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spewFile(pathSystemdMachineID, dbusMachineID, 0444)
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si.Node.MachineID = dbusMachineID
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return
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}
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// Copy systemd machine id to non-existent DBUS machine id.
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if systemdMachineID != "" && dbusMachineID == "" {
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spewFile(pathDbusMachineID, systemdMachineID, 0444)
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si.Node.MachineID = systemdMachineID
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return
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}
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}
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func (si *SysInfo) getTimezone() {
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const zoneInfoPrefix = "/usr/share/zoneinfo/"
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if fi, err := os.Lstat("/etc/localtime"); err == nil {
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if fi.Mode()&os.ModeSymlink == os.ModeSymlink {
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if tzfile, err := os.Readlink("/etc/localtime"); err == nil {
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tzfile = strings.TrimPrefix(tzfile, "..")
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if strings.HasPrefix(tzfile, zoneInfoPrefix) {
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si.Node.Timezone = strings.TrimPrefix(tzfile, zoneInfoPrefix)
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return
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}
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}
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}
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}
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if timezone := slurpFile("/etc/timezone"); timezone != "" {
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si.Node.Timezone = timezone
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return
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}
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if f, err := os.Open("/etc/sysconfig/clock"); err == nil {
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defer f.Close()
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s := bufio.NewScanner(f)
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for s.Scan() {
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if sl := strings.Split(s.Text(), "="); len(sl) == 2 {
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if sl[0] == "ZONE" {
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si.Node.Timezone = strings.Trim(sl[1], `"`)
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return
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}
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}
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}
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}
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}
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func (si *SysInfo) getNodeInfo() {
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si.getHostname()
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si.getSetMachineID()
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si.getHypervisor()
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si.getTimezone()
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}
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