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package reflink_test
import (
"bytes"
"crypto/rand"
"errors"
"io"
"os"
"path/filepath"
"testing"
"github.com/KarpelesLab/reflink"
)
func TestReflink(t *testing.T) {
d, err := os.MkdirTemp("", "reflinktest*")
if err != nil {
t.Fatalf("failed to create temporary directory: %s", err)
return
}
defer os.RemoveAll(d)
buf := make([]byte, 1024*1024) // 1MB
_, err = io.ReadFull(rand.Reader, buf)
if err != nil {
t.Errorf("failed to fill test buffer with random bytes: %s", err)
}
err = os.WriteFile(filepath.Join(d, "src.bin"), buf, 0666)
if err != nil {
t.Fatalf("failed to create initial test file: %s", err)
return
}
// perform reflink
err = reflink.Always(filepath.Join(d, "src.bin"), filepath.Join(d, "test1.bin"))
if err != nil {
if errors.Is(err, reflink.ErrReflinkUnsupported) {
t.Logf("cannot test reflink on this OS: %s", err)
} else if errors.Is(err, reflink.ErrReflinkFailed) {
t.Logf("cannot test reflink on this configuration: %s", err)
} else {
t.Errorf("failed to reflink.Always: %s", err)
}
}
// perform reflink auto
err = reflink.Auto(filepath.Join(d, "src.bin"), filepath.Join(d, "test2.bin"))
if err != nil {
t.Errorf("failed to reflink.Auto: %s", err)
}
err = testFile(filepath.Join(d, "test2.bin"), buf)
if err != nil {
t.Errorf("bad output file for reflink.Auto: %s", err)
}
in, err := os.Open(filepath.Join(d, "src.bin"))
if err != nil {
t.Fatalf("failed to open source file for reading: %s", err)
return
}
defer in.Close()
out, err := os.Create(filepath.Join(d, "test3.bin"))
if err != nil {
t.Fatalf("failed to create target file for writing: %s", err)
return
}
defer out.Close()
err = reflink.Reflink(out, in, true)
if err != nil {
t.Errorf("reflink on file failed: %s", err)
}
err = testOsFile(out, buf)
if err != nil {
t.Errorf("reflink target file content fails: %s", err)
}
out.Truncate(0)
err = reflink.Partial(out, in, 0, 512*1024, 256*1024, true)
if err != nil {
t.Errorf("failed to reflink.Partial(fallback=true): %s", err)
}
err = testOsFile(out, buf[512*1024:(512+256)*1024])
if err != nil {
t.Errorf("reflink target file content fails: %s", err)
}
}
func testFile(fn string, target []byte) error {
data, err := os.ReadFile(fn)
if err != nil {
return err
}
if !bytes.Equal(data, target) {
return errors.New("file content does not match")
}
return nil
}
func testOsFile(f *os.File, target []byte) error {
st, err := f.Stat()
if err != nil {
return err
}
r := io.NewSectionReader(f, 0, st.Size())
buf, err := io.ReadAll(r)
if err != nil {
return err
}
if !bytes.Equal(buf, target) {
return errors.New("file content does not match")
}
return nil
}
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