1 files changed, 60 insertions, 0 deletions
diff --git a/refstore/files/update_verify_current.go b/refstore/files/update_verify_current.go
new file mode 100644
index 00000000..f8035994
--- /dev/null
+++ b/refstore/files/update_verify_current.go
@@ -0,0 +1,60 @@
+package files
+
+import (
+	"strings"
+
+	"codeberg.org/lindenii/furgit/refstore"
+)
+
+func (executor *refUpdateExecutor) verifyPreparedUpdateCurrent(item preparedUpdate) error {
+	switch item.op.kind {
+	case updateCreate:
+		if item.target.ref.kind != directMissing {
+			return wrapUpdateError(item.op.name, &refstore.CreateExistsError{})
+		}
+
+		return nil
+	case updateReplace, updateDelete, updateVerify:
+		if item.target.ref.kind == directMissing {
+			return wrapUpdateError(item.op.name, refstore.ErrReferenceNotFound)
+		}
+
+		if item.target.ref.kind != directDetached {
+			return wrapUpdateError(item.op.name, &refstore.ExpectedDetachedError{})
+		}
+
+		if item.target.ref.id != item.op.oldID {
+			return wrapUpdateError(item.op.name, &refstore.IncorrectOldValueError{
+				Actual:   item.target.ref.id.String(),
+				Expected: item.op.oldID.String(),
+			})
+		}
+
+		return nil
+	case updateCreateSymbolic:
+		if item.target.ref.kind != directMissing {
+			return wrapUpdateError(item.op.name, &refstore.CreateExistsError{})
+		}
+
+		return nil
+	case updateReplaceSymbolic, updateDeleteSymbolic, updateVerifySymbolic:
+		if item.target.ref.kind == directMissing {
+			return wrapUpdateError(item.op.name, refstore.ErrReferenceNotFound)
+		}
+
+		if item.target.ref.kind != directSymbolic {
+			return wrapUpdateError(item.op.name, &refstore.ExpectedSymbolicError{})
+		}
+
+		if strings.TrimSpace(item.target.ref.target) != strings.TrimSpace(item.op.oldTarget) {
+			return wrapUpdateError(item.op.name, &refstore.IncorrectOldValueError{
+				Actual:   strings.TrimSpace(item.target.ref.target),
+				Expected: strings.TrimSpace(item.op.oldTarget),
+			})
+		}
+
+		return nil
+	}
+
+	return nil
+}