improved scrubbing of oplogs and filecas (#596)

- Improvement: Scrub command now validates compressed buffer hashes in filecas storage (used for large chunks)
- Improvement: Added --dry, --no-gc and --no-cas options to zen scrub command
- Improvement: Implemented oplog scrubbing (previously was a no-op)
- Improvement: Implemented support for running scrubbint at startup with --scrub=<options>

1 files changed, 17 insertions, 2 deletions

diff --git a/src/zenserver/main.cpp b/src/zenserver/main.cpp
index 6901323e3..868b5131c 100644
--- a/src/zenserver/main.cpp
+++ b/src/zenserver/main.cpp
@@ -338,9 +338,24 @@ main(int argc, char* argv[])
 		ZenServerOptions ServerOptions;
 		ParseCliOptions(argc, argv, ServerOptions);
 
-		if (ServerOptions.IsCleanStart || !ServerOptions.BaseSnapshotDir.empty())
+		std::string_view DeleteReason;
+
+		if (ServerOptions.IsCleanStart)
+		{
+			DeleteReason = "clean start requested"sv;
+		}
+		else if (!ServerOptions.BaseSnapshotDir.empty())
+		{
+			DeleteReason = "will initialize state from base snapshot"sv;
+		}
+
+		if (!DeleteReason.empty())
 		{
-			DeleteDirectories(ServerOptions.DataDir);
+			if (std::filesystem::exists(ServerOptions.DataDir))
+			{
+				ZEN_CONSOLE_INFO("deleting files from '{}' ({})", ServerOptions.DataDir, DeleteReason);
+				DeleteDirectories(ServerOptions.DataDir);
+			}
 		}
 
 		if (!std::filesystem::exists(ServerOptions.DataDir))