Support copy and renamed modifications for hg

CHANGELOG.md

@@ -26,6 +26,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Handle obscure line breaks in diff viewer ([#1129](https://github.com/scm-manager/scm-manager/pull/1129))
 - Validate subversion client checksum ([#1113](https://github.com/scm-manager/scm-manager/issues/1113))
 - Fix plugin manage permission ([#1135](https://github.com/scm-manager/scm-manager/pull/1135))
+- Missing copy on write in the data store ([#1155](https://github.com/scm-manager/scm-manager/pull/1155))
 
 ## [2.0.0-rc7] - 2020-04-09
 ### Added

scm-dao-xml/src/main/java/sonia/scm/store/JAXBDataStore.java

@@ -84,7 +84,10 @@ public class JAXBDataStore<T> extends FileBasedStore<T> implements DataStore<T>
       Marshaller marshaller = context.createMarshaller();
 
       marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
-      marshaller.marshal(item, file);
+      CopyOnWrite.withTemporaryFile(
+        temp -> marshaller.marshal(item, temp.toFile()),
+        file.toPath()
+      );
     }
     catch (JAXBException ex) {
       throw new StoreException("could not write object with id ".concat(id),