1 files changed, 69 insertions, 0 deletions
diff --git a/src/garage/cli/convert_db.rs b/src/garage/cli/convert_db.rs
new file mode 100644
index 00000000..ffb5c44c
--- /dev/null
+++ b/src/garage/cli/convert_db.rs
@@ -0,0 +1,69 @@
+use std::path::PathBuf;
+
+use structopt::StructOpt;
+
+use garage_db::*;
+
+/// K2V command line interface
+#[derive(StructOpt, Debug)]
+pub struct ConvertDbOpt {
+	/// Input database path (not the same as metadata_dir, see
+	/// https://garagehq.deuxfleurs.fr/documentation/reference-manual/configuration/#db-engine-since-v0-8-0)
+	#[structopt(short = "i")]
+	input_path: PathBuf,
+	/// Input database engine (sled, lmdb or sqlite; limited by db engines
+	/// enabled in this build)
+	#[structopt(short = "a")]
+	input_engine: String,
+
+	/// Output database path
+	#[structopt(short = "o")]
+	output_path: PathBuf,
+	/// Output database engine
+	#[structopt(short = "b")]
+	output_engine: String,
+}
+
+pub(crate) fn do_conversion(args: ConvertDbOpt) -> Result<()> {
+	let input = open_db(args.input_path, args.input_engine)?;
+	let output = open_db(args.output_path, args.output_engine)?;
+	output.import(&input)?;
+	Ok(())
+}
+
+fn open_db(path: PathBuf, engine: String) -> Result<Db> {
+	match engine.as_str() {
+		#[cfg(feature = "sled")]
+		"sled" => {
+			let db = sled_adapter::sled::Config::default().path(&path).open()?;
+			Ok(sled_adapter::SledDb::init(db))
+		}
+		#[cfg(feature = "sqlite")]
+		"sqlite" | "sqlite3" | "rusqlite" => {
+			let db = sqlite_adapter::rusqlite::Connection::open(&path)?;
+			db.pragma_update(None, "journal_mode", &"WAL")?;
+			db.pragma_update(None, "synchronous", &"NORMAL")?;
+			Ok(sqlite_adapter::SqliteDb::init(db))
+		}
+		#[cfg(feature = "lmdb")]
+		"lmdb" | "heed" => {
+			std::fs::create_dir_all(&path).map_err(|e| {
+				Error(format!("Unable to create LMDB data directory: {}", e).into())
+			})?;
+
+			let map_size = lmdb_adapter::recommended_map_size();
+
+			let mut env_builder = lmdb_adapter::heed::EnvOpenOptions::new();
+			env_builder.max_dbs(100);
+			env_builder.map_size(map_size);
+			unsafe {
+				env_builder.flag(heed::flags::Flags::MdbNoMetaSync);
+			}
+			let db = env_builder.open(&path)?;
+			Ok(lmdb_adapter::LmdbDb::init(db))
+		}
+		e => Err(Error(
+			format!("Invalid or unsupported DB engine: {}", e).into(),
+		)),
+	}
+}