Allow garage layout assign to assign to several nodes at once

src/garage/cli/layout.rs

@@ -43,7 +43,11 @@ pub async fn cmd_assign_role(
 		resp => return Err(Error::Message(format!("Invalid RPC response: {:?}", resp))),
 	};
 
-	let added_node = find_matching_node(status.iter().map(|adv| adv.id), &args.node_id)?;
+	let added_nodes = args
+		.node_ids
+		.iter()
+		.map(|node_id| find_matching_node(status.iter().map(|adv| adv.id), node_id))
+		.collect::<Result<Vec<_>, _>>()?;
 
 	let mut layout = fetch_layout(rpc_cli, rpc_host).await?;
 
@@ -75,6 +79,7 @@ pub async fn cmd_assign_role(
 		return Err(Error::Message("Invalid capacity value: 0".into()));
 	}
 
+	for added_node in added_nodes {
 		let new_entry = match roles.get(&added_node) {
 			Some(NodeRoleV(Some(old))) => {
 				let capacity = match args.capacity {
@@ -85,10 +90,10 @@ pub async fn cmd_assign_role(
 				let tags = if args.tags.is_empty() {
 					old.tags.clone()
 				} else {
-				args.tags
+					args.tags.clone()
 				};
 				NodeRole {
-				zone: args.zone.unwrap_or_else(|| old.zone.to_string()),
+					zone: args.zone.clone().unwrap_or_else(|| old.zone.to_string()),
 					capacity,
 					tags,
 				}
@@ -101,9 +106,12 @@ pub async fn cmd_assign_role(
 							"Please specify a capacity with the -c flag, or set node explicitly as gateway with -g".into())),
 				};
 				NodeRole {
-				zone: args.zone.ok_or("Please specifiy a zone with the -z flag")?,
+					zone: args
+						.zone
+						.clone()
+						.ok_or("Please specifiy a zone with the -z flag")?,
 					capacity,
-				tags: args.tags,
+					tags: args.tags.clone(),
 				}
 			}
 		};
@@ -111,10 +119,11 @@ pub async fn cmd_assign_role(
 		layout
 			.staging
 			.merge(&roles.update_mutator(added_node, NodeRoleV(Some(new_entry))));
+	}
 
 	send_layout(rpc_cli, rpc_host, layout).await?;
 
-	println!("Role change is staged but not yet commited.");
+	println!("Role changes are staged but not yet commited.");
 	println!("Use `garage layout show` to view staged role changes,");
 	println!("and `garage layout apply` to enact staged changes.");
 	Ok(())
@@ -196,15 +205,6 @@ pub async fn cmd_apply_layout(
 ) -> Result<(), Error> {
 	let mut layout = fetch_layout(rpc_cli, rpc_host).await?;
 
-	layout.roles.merge(&layout.staging);
-
-	if !layout.calculate_partition_assignation() {
-		return Err(Error::Message("Could not calculate new assignation of partitions to nodes. This can happen if there are less nodes than the desired number of copies of your data (see the replication_mode configuration parameter).".into()));
-	}
-
-	layout.staging.clear();
-	layout.staging_hash = blake2sum(&rmp_to_vec_all_named(&layout.staging).unwrap()[..]);
-
 	match apply_opt.version {
 		None => {
 			println!("Please pass the --version flag to ensure that you are writing the correct version of the cluster layout.");
@@ -218,6 +218,15 @@ pub async fn cmd_apply_layout(
 		}
 	}
 
+	layout.roles.merge(&layout.staging);
+
+	if !layout.calculate_partition_assignation() {
+		return Err(Error::Message("Could not calculate new assignation of partitions to nodes. This can happen if there are less nodes than the desired number of copies of your data (see the replication_mode configuration parameter).".into()));
+	}
+
+	layout.staging.clear();
+	layout.staging_hash = blake2sum(&rmp_to_vec_all_named(&layout.staging).unwrap()[..]);
+
 	layout.version += 1;
 
 	send_layout(rpc_cli, rpc_host, layout).await?;

src/garage/cli/structs.rs

@@ -92,8 +92,9 @@ pub enum LayoutOperation {
 
 #[derive(StructOpt, Debug)]
 pub struct AssignRoleOpt {
-	/// Node to which to assign role (prefix of hexadecimal node id)
+	/// Node(s) to which to assign role (prefix of hexadecimal node id)
-	pub(crate) node_id: String,
+	#[structopt(required = true)]
+	pub(crate) node_ids: Vec<String>,
 
 	/// Location (zone or datacenter) of the node
 	#[structopt(short = "z", long = "zone")]