Moves files

internal/fs/deviceid_unix.go

@@ -0,0 +1,30 @@
+// +build !windows
+
+package fs
+
+import (
+	"os"
+	"syscall"
+
+	"restic/errors"
+)
+
+// DeviceID extracts the device ID from an os.FileInfo object by casting it
+// to syscall.Stat_t
+func DeviceID(fi os.FileInfo) (deviceID uint64, err error) {
+	if fi == nil {
+		return 0, errors.New("unable to determine device: fi is nil")
+	}
+
+	if fi.Sys() == nil {
+		return 0, errors.New("unable to determine device: fi.Sys() is nil")
+	}
+
+	if st, ok := fi.Sys().(*syscall.Stat_t); ok {
+		// st.Dev is uint32 on Darwin and uint64 on Linux. Just cast
+		// everything to uint64.
+		return uint64(st.Dev), nil
+	}
+
+	return 0, errors.New("Could not cast to syscall.Stat_t")
+}