103 lines
2 KiB
Go
103 lines
2 KiB
Go
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package prober
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import (
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"bytes"
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"errors"
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"fmt"
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"os/exec"
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"regexp"
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"strconv"
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"strings"
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"git.faercol.me/faercol/http-boot-config/config/logger"
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)
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var efiBootmgrRegexp = regexp.MustCompile(`Boot(?P<id>\d+)\* (?P<name>[\w ]+)\t(\w+\(.*\))/File\((?P<filepath>.+)\)`)
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var activeRegexp = regexp.MustCompile(`BootCurrent: (\d+)`)
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type EfiApp struct {
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ID int
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Name string
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Path string
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Active bool
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}
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func efiAppFromBootMgrOutput(rawVal string, activeId int) (app EfiApp, ok bool) {
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match := efiBootmgrRegexp.FindStringSubmatch(rawVal)
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if len(match) == 0 {
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return
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}
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result := make(map[string]string)
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for i, name := range efiBootmgrRegexp.SubexpNames() {
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if i != 0 && name != "" {
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result[name] = match[i]
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}
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}
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id, ok := result["id"]
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if !ok {
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return
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}
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idInt, err := strconv.Atoi(id)
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if err != nil {
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return app, false
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}
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name, ok := result["name"]
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if !ok {
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return
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}
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filepath, ok := result["filepath"]
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if !ok {
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return
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}
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return EfiApp{
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ID: idInt,
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Name: strings.TrimSpace(name),
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Path: strings.TrimSpace(filepath),
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Active: idInt == activeId,
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}, true
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}
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func getActiveEFIApp(output string) (int, error) {
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match := activeRegexp.FindStringSubmatch(output)
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if len(match) == 0 {
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return -1, errors.New("no active boot image found")
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}
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strId := match[1]
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id, err := strconv.Atoi(strId)
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if err != nil {
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return -1, err
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}
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return id, nil
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}
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func GetEFIApps(log *logger.SimpleLogger) (apps []EfiApp, err error) {
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cmd := exec.Command("/usr/bin/efibootmgr")
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var out bytes.Buffer
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cmd.Stdout = &out
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err = cmd.Run()
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if err != nil {
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return
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}
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if cmd.ProcessState.ExitCode() != 0 {
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return nil, fmt.Errorf("error running efibootmgr, returncode %d", cmd.ProcessState.ExitCode())
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}
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outStr := out.String()
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activeBootID, err := getActiveEFIApp(outStr)
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if err != nil {
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return
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}
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for _, l := range strings.Split(outStr, "\n") {
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log.Debugf("Parsing line %q", l)
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app, ok := efiAppFromBootMgrOutput(l, activeBootID)
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if !ok {
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log.Debug("Line is not a valid EFI application")
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continue
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}
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apps = append(apps, app)
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}
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return
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}
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