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// +build linux
package machineid
import "errors"
const (
// dbusPath is the default path for dbus machine id.
dbusPath = "/var/lib/dbus/machine-id"
// dbusPathEtc is the default path for dbus machine id located in /etc.
// Some systems (like Fedora 20) only know this path.
// Sometimes it's the other way round.
dbusPathEtc = "/etc/machine-id"
)
// machineID returns the uuid specified at `/var/lib/dbus/machine-id` or `/etc/machine-id`.
// If there is an error reading the files an empty string is returned.
// See https://unix.stackexchange.com/questions/144812/generate-consistent-machine-unique-id
func machineID() (string, error) {
id, err := readFile(dbusPath)
if err != nil || trim(string(id)) == "" {
// try fallback path
id, err = readFile(dbusPathEtc)
}
if err != nil {
return "", err
}
if trim(string(id)) == "" {
return "", errors.New("All known machineid file are empty")
}
return trim(string(id)), nil
}
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