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eeprom.go
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eeprom.go
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package gokrazy
import (
"fmt"
"io"
"os"
"strings"
"github.com/gokrazy/internal/fat"
"github.com/gokrazy/internal/rootdev"
)
type eepromVersion struct {
PieepromSHA256 string // pieeprom.sig
VL805SHA256 string // vl805.sig
}
// filled by SuperviseServices()
var lastInstalledEepromVersion *eepromVersion
func readLastInstalledEepromVersion() (*eepromVersion, error) {
f, err := os.OpenFile(rootdev.Partition(rootdev.Boot), os.O_RDONLY, 0600)
if err != nil {
return nil, err
}
defer f.Close()
rd, err := fat.NewReader(f)
if err != nil {
return nil, err
}
if _, err := rd.ModTime("/RECOVERY.000"); err != nil {
return nil, fmt.Errorf("RECOVERY.000 not found, assuming update unsuccessful")
}
// Get all extents before we start seeking, which confuses the fat.Reader.
offsetE, lengthE, err := rd.Extents("/pieeprom.sig")
if err != nil {
return nil, err
}
offsetV, lengthV, err := rd.Extents("/vl805.sig")
if err != nil {
return nil, err
}
result := &eepromVersion{}
{
if _, err := f.Seek(offsetE, io.SeekStart); err != nil {
return nil, err
}
b := make([]byte, lengthE)
if _, err := f.Read(b); err != nil {
return nil, err
}
result.PieepromSHA256 = strings.TrimSpace(string(b))
}
{
if _, err := f.Seek(offsetV, io.SeekStart); err != nil {
return nil, err
}
b := make([]byte, lengthV)
if _, err := f.Read(b); err != nil {
return nil, err
}
result.VL805SHA256 = strings.TrimSpace(string(b))
}
return result, nil
}