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nvlist_test.go
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nvlist_test.go
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package nvlist_test
import (
"bytes"
"encoding/json"
"io"
"log"
"os"
"path"
"testing"
"github.com/ayang64/ztool/zfs/internal/nvlist"
)
func TestLooper(t *testing.T) {
strOr := func(s ...string) string {
for i := range s {
if s[i] != "" {
return s[i]
}
}
return ""
}
volpath := strOr(os.Getenv("ZFSFILE"), "/obrovsky/recovery/zbackup0")
fh, err := os.Open(volpath)
if err != nil {
t.Fatalf("could not open %q; %v -- must set ZFSFILE", volpath, err)
}
reader := func() io.Reader {
switch path.Ext(volpath) {
case ".cache":
// concatinate a few bytes
inf, err := os.Open(volpath)
if err != nil {
log.Fatal(err)
}
return io.MultiReader(bytes.NewReader([]byte{0x0, 0x1, 0x0, 0x0}), inf)
default:
// zfs nvlist is XDR encoded data that lives between 0x4000 - 0x20000 on the volume.
// return a section reader covering that range.
//
// this could easily be:
//
// io.NewSectionReader(fh, 0x4000, 0x1c000)
fh.Seek(0x4000, 0)
return io.LimitReader(fh, 0x1c000)
}
}
m, err := nvlist.Read(reader())
if err != nil {
t.Fatal(err)
}
o, err := json.MarshalIndent(m, "", " ")
if err != nil {
t.Fatal(err)
}
t.Logf("\n%s", string(o))
}