refactor: Use explicit interface instead of os.File for drive backend

pkg/config/config.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"io"
 	"io/fs"
-	"os"
 	"time"
 )
 
@@ -18,8 +17,13 @@ type DriveWriterConfig struct {
 	DriveIsRegular bool
 }
 
+type Drive interface {
+	io.ReadSeeker
+	Fd() uintptr
+}
+
 type DriveConfig struct {
-	Drive          *os.File
+	Drive          Drive
 	DriveIsRegular bool
 }
 

pkg/hardware/eject.go

@@ -8,5 +8,5 @@ import (
 func Eject(
 	state config.DriveConfig,
 ) error {
-	return mtio.EjectTape(state.Drive)
+	return mtio.EjectTape(state.Drive.Fd())
 }

pkg/hardware/tell.go

@@ -8,5 +8,5 @@ import (
 func Tell(
 	state config.DriveConfig,
 ) (int64, error) {
-	return mtio.GetCurrentRecordFromTape(state.Drive)
+	return mtio.GetCurrentRecordFromTape(state.Drive.Fd())
 }

pkg/recovery/fetch.go

@@ -46,7 +46,7 @@ func Fetch(
 		tr = tar.NewReader(reader.Drive)
 	} else {
 		// Seek to record
-		if err := mtio.SeekToRecordOnTape(drive.Drive, int32(record)); err != nil {
+		if err := mtio.SeekToRecordOnTape(drive.Drive.Fd(), int32(record)); err != nil {
 			return err
 		}
 

pkg/recovery/index.go

@@ -150,7 +150,7 @@ func Index(
 		}
 	} else {
 		// Seek to record
-		if err := mtio.SeekToRecordOnTape(drive.Drive, int32(record)); err != nil {
+		if err := mtio.SeekToRecordOnTape(drive.Drive.Fd(), int32(record)); err != nil {
 			return err
 		}
 
@@ -172,13 +172,13 @@ func Index(
 			hdr, err := tr.Next()
 			if err != nil {
 				if err == io.EOF {
-					if err := mtio.GoToNextFileOnTape(drive.Drive); err != nil {
+					if err := mtio.GoToNextFileOnTape(drive.Drive.Fd()); err != nil {
 						// EOD
 
 						break
 					}
 
-					record, err = mtio.GetCurrentRecordFromTape(drive.Drive)
+					record, err = mtio.GetCurrentRecordFromTape(drive.Drive.Fd())
 					if err != nil {
 						return err
 					}

pkg/recovery/query.go

@@ -132,7 +132,7 @@ func Query(
 		}
 	} else {
 		// Seek to record
-		if err := mtio.SeekToRecordOnTape(state.Drive, int32(record)); err != nil {
+		if err := mtio.SeekToRecordOnTape(state.Drive.Fd(), int32(record)); err != nil {
 			return []*tar.Header{}, err
 		}
 
@@ -153,13 +153,13 @@ func Query(
 			hdr, err := tr.Next()
 			if err != nil {
 				if err == io.EOF {
-					if err := mtio.GoToNextFileOnTape(state.Drive); err != nil {
+					if err := mtio.GoToNextFileOnTape(state.Drive.Fd()); err != nil {
 						// EOD
 
 						break
 					}
 
-					record, err = mtio.GetCurrentRecordFromTape(state.Drive)
+					record, err = mtio.GetCurrentRecordFromTape(state.Drive.Fd())
 					if err != nil {
 						return []*tar.Header{}, err
 					}

pkg/tape/write.go

@@ -40,7 +40,7 @@ func OpenTapeWriteOnly(drive string, recordSize int, overwrite bool) (f *os.File
 			}
 
 			// Seek to the start of the tape
-			if err := mtio.SeekToRecordOnTape(f, 0); err != nil {
+			if err := mtio.SeekToRecordOnTape(f.Fd(), 0); err != nil {
 				return nil, false, err
 			}
 
@@ -65,7 +65,7 @@ func OpenTapeWriteOnly(drive string, recordSize int, overwrite bool) (f *os.File
 
 		if !overwrite {
 			// Go to end of tape
-			if err := mtio.GoToEndOfTape(f); err != nil {
+			if err := mtio.GoToEndOfTape(f.Fd()); err != nil {
 				return nil, false, err
 			}
 		}