Set up fuzz infrastructure

src/model/Cargo.toml

@@ -21,6 +21,7 @@ garage_block.workspace = true
 garage_util.workspace = true
 garage_net.workspace = true
 
+arbitrary = { optional = true, workspace = true }
 argon2.workspace = true
 async-trait.workspace = true
 blake2.workspace = true
@@ -46,6 +47,7 @@ k2v = ["garage_util/k2v"]
 lmdb = ["garage_db/lmdb"]
 sqlite = ["garage_db/sqlite"]
 fjall = ["garage_db/fjall"]
+arbitrary = ["dep:arbitrary","garage_util/arbitrary"]
 
 [lints]
 workspace = true

src/util/Cargo.toml

@@ -17,6 +17,7 @@ path = "lib.rs"
 garage_db.workspace = true
 garage_net.workspace = true
 
+arbitrary = { optional = true, workspace = true }
 arc-swap.workspace = true
 async-trait.workspace = true
 blake2.workspace = true
@@ -52,6 +53,7 @@ mktemp.workspace = true
 
 [features]
 k2v = []
+arbitrary = ["dep:arbitrary"]
 
 [lints]
 workspace = true

src/util/crdt/lww.rs

@@ -84,6 +84,11 @@ where
 		self.v = new_value;
 	}
 
+	pub fn update2(&mut self, f: impl FnOnce(&mut T), time: u64) {
+		self.ts = std::cmp::max(self.ts + 1, time);
+		f(&mut self.v)
+	}
+
 	/// Get the timestamp currently associated with the value
 	pub fn timestamp(&self) -> u64 {
 		self.ts

src/util/data.rs

@@ -6,6 +6,7 @@ use std::fmt;
 
 /// An array of 32 bytes
 #[derive(Default, Clone, Hash, PartialEq, Eq, PartialOrd, Ord, Copy)]
+#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
 pub struct FixedBytes32([u8; 32]);
 
 impl From<[u8; 32]> for FixedBytes32 {