Support adding extra ssh options on node configurations

src/nix/hive/options.nix

@@ -208,6 +208,13 @@ with builtins; rec {
           type = types.listOf types.str;
           default = [ "sudo" "-H" "--" ];
         };
+        extraSSHOptions = lib.mkOption {
+          description = mdDoc ''
+            Extra SSH options to pass to the SSH command.
+          '';
+          type = types.listOf types.str;
+          default = [];
+        };
       };
     };
   };

src/nix/host/ssh.rs

@@ -33,6 +33,9 @@ pub struct Ssh {
     /// Command to elevate privileges with.
     privilege_escalation_command: Vec<String>,
 
+    /// extra SSH options
+    extra_ssh_options: Vec<String>,
+
     /// Whether to use the experimental `nix copy` command.
     use_nix3_copy: bool,
 
@@ -189,6 +192,7 @@ impl Ssh {
             port: None,
             ssh_config: None,
             privilege_escalation_command: Vec::new(),
+            extra_ssh_options: Vec::new(),
             use_nix3_copy: false,
             job: None,
         }
@@ -206,6 +210,10 @@ impl Ssh {
         self.privilege_escalation_command = command;
     }
 
+    pub fn set_extra_ssh_options(&mut self, options: Vec<String>) {
+        self.extra_ssh_options = options;
+    }
+
     pub fn set_use_nix3_copy(&mut self, enable: bool) {
         self.use_nix3_copy = enable;
     }
@@ -346,6 +354,7 @@ impl Ssh {
         ]
         .iter()
         .map(|s| s.to_string())
+        .chain(self.extra_ssh_options.clone())
         .collect();
 
         if let Some(port) = self.port {

src/nix/mod.rs

@@ -78,6 +78,9 @@ pub struct NodeConfig {
     #[serde(rename = "privilegeEscalationCommand")]
     privilege_escalation_command: Vec<String>,
 
+    #[serde(rename = "extraSSHOptions")]
+    extra_ssh_options: Vec<String>,
+
     #[validate(custom = "validate_keys")]
     keys: HashMap<String, Key>,
 }
@@ -181,6 +184,7 @@ impl NodeConfig {
         self.target_host.as_ref().map(|target_host| {
             let mut host = Ssh::new(self.target_user.clone(), target_host.clone());
             host.set_privilege_escalation_command(self.privilege_escalation_command.clone());
+            host.set_extra_ssh_options(self.extra_ssh_options.clone());
 
             if let Some(target_port) = self.target_port {
                 host.set_port(target_port);