mirror of https://github.com/kidoman/embd
140 lines
3.5 KiB
Go
140 lines
3.5 KiB
Go
// Host detection.
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package embd
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import (
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"fmt"
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"io/ioutil"
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"os/exec"
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"strconv"
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"strings"
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)
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// The Host type represents all the supported host types.
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type Host string
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const (
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// HostNull reprents a null host.
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HostNull Host = ""
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// HostRPi represents the RaspberryPi.
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HostRPi = "Raspberry Pi"
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// HostBBB represents the BeagleBone Black.
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HostBBB = "BeagleBone Black"
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// HostGalileo represents the Intel Galileo board.
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HostGalileo = "Intel Galileo"
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// HostCubieTruck represents the Cubie Truck.
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HostCubieTruck = "CubieTruck"
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// HostRadxa represents the Radxa board.
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HostRadxa = "Radxa"
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// HostCHIP represents the NextThing C.H.I.P.
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HostCHIP = "CHIP"
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)
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func execOutput(name string, arg ...string) (output string, err error) {
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var out []byte
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if out, err = exec.Command(name, arg...).Output(); err != nil {
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return
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}
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output = strings.TrimSpace(string(out))
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return
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}
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func parseVersion(str string) (major, minor, patch int, err error) {
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versionNumber := strings.Split(str, "-")
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parts := strings.Split(versionNumber[0], ".")
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len := len(parts)
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if major, err = strconv.Atoi(parts[0]); err != nil {
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return 0, 0, 0, err
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}
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if minor, err = strconv.Atoi(parts[1]); err != nil {
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return 0, 0, 0, err
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}
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if len > 2 {
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part := parts[2]
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part = strings.TrimSuffix(part, "+")
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if patch, err = strconv.Atoi(part); err != nil {
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return 0, 0, 0, err
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}
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}
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return major, minor, patch, err
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}
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func kernelVersion() (major, minor, patch int, err error) {
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output, err := execOutput("uname", "-r")
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if err != nil {
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return 0, 0, 0, err
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}
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return parseVersion(output)
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}
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func cpuInfo() (model, hardware string, revision int, err error) {
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output, err := ioutil.ReadFile("/proc/cpuinfo")
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if err != nil {
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return "", "", 0, err
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}
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for _, line := range strings.Split(string(output), "\n") {
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fields := strings.Split(line, ":")
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if len(fields) < 1 {
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continue
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}
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switch {
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case strings.HasPrefix(fields[0], "Revision"):
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revs := strings.TrimSpace(fields[1])
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rev, err := strconv.ParseInt(revs, 16, 32)
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if err != nil {
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continue
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}
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revision = int(rev)
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case strings.HasPrefix(fields[0], "Hardware"):
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hardware = strings.TrimSpace(fields[1])
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case strings.HasPrefix(fields[0], "model name"):
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model = fields[1]
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}
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}
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return model, hardware, revision, nil
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}
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// DetectHost returns the detected host and its revision number.
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func DetectHost() (host Host, rev int, err error) {
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major, minor, patch, err := kernelVersion()
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if err != nil {
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return HostNull, 0, err
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}
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if major < 3 || (major == 3 && minor < 8) {
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return HostNull, 0, fmt.Errorf(
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"embd: linux kernel versions lower than 3.8 are not supported, "+
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"you have %v.%v.%v", major, minor, patch)
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}
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model, hardware, rev, err := cpuInfo()
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if err != nil {
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return HostNull, 0, err
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}
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switch {
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case strings.Contains(model, "ARMv7") && (strings.Contains(hardware, "AM33XX") || strings.Contains(hardware, "AM335X")):
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return HostBBB, rev, nil
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case strings.Contains(hardware, "BCM2708") || strings.Contains(hardware, "BCM2709") || strings.Contains(hardware, "BCM2835"):
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return HostRPi, rev, nil
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case hardware == "Allwinner sun4i/sun5i Families":
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if major < 4 || (major == 4 && minor < 4) {
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return HostNull, 0, fmt.Errorf(
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"embd: linux kernel version 4.4+ required, you have %v.%v",
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major, minor)
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}
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return HostCHIP, rev, nil
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default:
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return HostNull, 0, fmt.Errorf(`embd: your host "%v:%v" is not supported at this moment. request support at https://github.com/kidoman/embd/issues`, host, model)
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}
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}
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