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|
package kobject
import (
"errors"
"strconv"
"strings"
"unsafe"
"hakurei.app/internal/uevent"
)
// Event is a [uevent.Message] with known environment variables processed.
type Event struct {
// alloc_uevent_skb: action_string
Action uevent.KobjectAction `json:"action"`
// alloc_uevent_skb: devpath
DevPath string `json:"devpath"`
// Uninterpreted environment variable pairs. An entry missing a separator
// gains the value "\x00".
Env map[string]string `json:"env"`
// SEQNUM value set by the kernel.
Sequence uint64 `json:"seqnum"`
// SYNTH_UUID value set on trigger, nil denotes a non-synthetic event.
Synth *uevent.UUID `json:"synth_uuid,omitempty"`
// SUBSYSTEM value set by the kernel.
Subsystem string `json:"subsystem"`
}
// Populate populates e with the contents of a [uevent.Message].
//
// The ACTION and DEVPATH environment variables are ignored and assumed to be
// consistent with the header.
func (e *Event) Populate(reportErr func(error), m *uevent.Message) {
if reportErr == nil {
reportErr = func(error) {}
}
*e = Event{
Action: m.Action,
DevPath: m.DevPath,
Env: make(map[string]string),
}
for _, s := range m.Env {
k, v, ok := strings.Cut(s, "=")
if !ok {
if _, ok = e.Env[s]; !ok {
e.Env[s] = "\x00"
}
continue
}
switch k {
case "ACTION", "DEVPATH":
continue
case "SEQNUM":
seq, err := strconv.ParseUint(v, 10, 64)
if err != nil {
if _e := errors.Unwrap(err); _e != nil {
err = _e
}
reportErr(err)
e.Env[k] = v
continue
}
e.Sequence = seq
case "SYNTH_UUID":
var uuid uevent.UUID
err := uuid.UnmarshalText(unsafe.Slice(unsafe.StringData(v), len(v)))
if err != nil {
reportErr(err)
e.Env[k] = v
continue
}
e.Synth = &uuid
case "SUBSYSTEM":
e.Subsystem = v
default:
e.Env[k] = v
}
}
}
|
