db/update/Walk: add Directory reference parameter

Remove dependency on the DatabaseSimple library.

src/db/update/UpdateGlue.cxx

@@ -44,7 +44,8 @@ UpdateService::Task()
 
 	SetThreadIdlePriority();
 
-	modified = walk.Walk(next.path_utf8.c_str(), next.discard);
+	modified = walk.Walk(*db_get_root(), next.path_utf8.c_str(),
+			     next.discard);
 
 	if (modified || !db_exists()) {
 		Error error;

src/db/update/Walk.cxx

@@ -23,7 +23,6 @@
 #include "Editor.hxx"
 #include "UpdateDomain.hxx"
 #include "db/DatabaseLock.hxx"
-#include "db/DatabaseSimple.hxx"
 #include "db/Directory.hxx"
 #include "db/Song.hxx"
 #include "db/PlaylistVector.hxx"
@@ -393,9 +392,9 @@ UpdateWalk::DirectoryMakeChildChecked(Directory &parent, const char *name_utf8)
 }
 
 inline Directory *
-UpdateWalk::DirectoryMakeUriParentChecked(const char *uri)
+UpdateWalk::DirectoryMakeUriParentChecked(Directory &root, const char *uri)
 {
-	Directory *directory = db_get_root();
+	Directory *directory = &root;
 	char *duplicated = xstrdup(uri);
 	char *name_utf8 = duplicated, *slash;
 
@@ -418,9 +417,9 @@ UpdateWalk::DirectoryMakeUriParentChecked(const char *uri)
 }
 
 inline void
-UpdateWalk::UpdateUri(const char *uri)
+UpdateWalk::UpdateUri(Directory &root, const char *uri)
 {
-	Directory *parent = DirectoryMakeUriParentChecked(uri);
+	Directory *parent = DirectoryMakeUriParentChecked(root, uri);
 	if (parent == nullptr)
 		return;
 
@@ -435,19 +434,18 @@ UpdateWalk::UpdateUri(const char *uri)
 }
 
 bool
-UpdateWalk::Walk(const char *path, bool discard)
+UpdateWalk::Walk(Directory &root, const char *path, bool discard)
 {
 	walk_discard = discard;
 	modified = false;
 
 	if (path != nullptr && !isRootDirectory(path)) {
-		UpdateUri(path);
+		UpdateUri(root, path);
 	} else {
-		Directory *directory = db_get_root();
 		struct stat st;
 
-		if (stat_directory(*directory, &st) == 0)
+		if (stat_directory(root, &st) == 0)
-			UpdateDirectory(*directory, &st);
+			UpdateDirectory(root, &st);
 	}
 
 	return modified;

src/db/update/Walk.hxx

@@ -54,7 +54,7 @@ public:
 	/**
 	 * Returns true if the database was modified.
 	 */
-	bool Walk(const char *path, bool discard);
+	bool Walk(Directory &root, const char *path, bool discard);
 
 private:
 	gcc_pure
@@ -126,9 +126,10 @@ private:
 	Directory *DirectoryMakeChildChecked(Directory &parent,
 					     const char *name_utf8);
 
-	Directory *DirectoryMakeUriParentChecked(const char *uri);
+	Directory *DirectoryMakeUriParentChecked(Directory &root,
+						 const char *uri);
 
-	void UpdateUri(const char *uri);
+	void UpdateUri(Directory &root, const char *uri);
 };
 
 #endif