Sync submodules when checking out a Repository.

src/de/uni_passau/fim/gitwrapper/Repository.java

@@ -128,7 +128,7 @@ public class Repository {
             return !failed;
         };
 
-        return checkout.map(toBoolean).orElse(false);
+        return checkout.map(toBoolean).map(co -> co && syncSubmodules()).orElse(false);
     }
 
     /**
@@ -152,7 +152,33 @@ public class Repository {
             return true;
         };
 
-        return checkout.map(toBoolean).orElse(false);
+        return checkout.map(toBoolean).map(co -> co && syncSubmodules()).orElse(false);
+    }
+
+    /**
+     * Synchronizes and initializes the submodules of this repository.
+     *
+     * @return whether the synchronization was successful
+     */
+    private Boolean syncSubmodules() {
+        Optional<ExecRes> init = git.exec(dir, "submodule", "init");
+        Optional<ExecRes> sync = init.filter(ExecRes::succeeded)
+                                     .flatMap(res -> git.exec(dir, "submodule", "sync"));
+        Optional<ExecRes> update = sync.filter(ExecRes::succeeded)
+                                       .flatMap(res -> git.exec(dir, "submodule", "update", "--init", "--recursive"));
+
+        Function<ExecRes, Boolean> toBoolean = res -> {
+            boolean failed = git.failed(res);
+
+            if (failed) {
+                LOG.warning(() -> "Failed to sync the submodules of " + Repository.this);
+                return false;
+            }
+
+            return true;
+        };
+
+        return update.map(toBoolean).orElse(false);
     }
 
     /**