Add an ssh_arguments configuration file field (#211)

Can be used to add SSH command-line arguments like `-o
ConnectTimeout=2`

src/config.rs

@@ -87,6 +87,7 @@ pub struct ConfigFile {
     git_repos: Option<Vec<String>>,
     disable: Option<Vec<Step>>,
     remote_topgrades: Option<Vec<String>>,
+    ssh_arguments: Option<String>,
 }
 
 impl ConfigFile {
@@ -270,6 +271,11 @@ impl Config {
         &self.config_file.remote_topgrades
     }
 
+    /// Extra SSH arguments
+    pub fn ssh_arguments(&self) -> &Option<String> {
+        &self.config_file.ssh_arguments
+    }
+
     /// Prompt for a key before exiting
     pub fn keep_at_end(&self) -> bool {
         self.opt.keep_at_end || env::var("TOPGRADE_KEEP_END").is_ok()

src/main.rs

@@ -132,7 +132,14 @@ fn run() -> Result<(), Error> {
                 execute(
                     &mut report,
                     remote_topgrade,
-                    || generic::run_remote_topgrade(run_type, remote_topgrade, config.run_in_tmux()),
+                    || {
+                        generic::run_remote_topgrade(
+                            run_type,
+                            remote_topgrade,
+                            config.ssh_arguments(),
+                            config.run_in_tmux(),
+                        )
+                    },
                     config.no_retry(),
                 )?;
             }

src/steps/generic.rs

@@ -137,7 +137,12 @@ pub fn run_composer_update(base_dirs: &BaseDirs, run_type: RunType) -> Result<()
     Ok(())
 }
 
-pub fn run_remote_topgrade(run_type: RunType, hostname: &str, run_in_tmux: bool) -> Result<(), Error> {
+pub fn run_remote_topgrade(
+    run_type: RunType,
+    hostname: &str,
+    ssh_arguments: &Option<String>,
+    run_in_tmux: bool,
+) -> Result<(), Error> {
     let ssh = utils::require("ssh")?;
 
     if run_in_tmux && !run_type.dry() {
@@ -149,15 +154,15 @@ pub fn run_remote_topgrade(run_type: RunType, hostname: &str, run_in_tmux: bool)
 
         unreachable!("Tmux execution is only implemented in Unix");
     } else {
-        run_type
-            .execute(&ssh)
-            .args(&[
-                "-t",
-                hostname,
-                "env",
-                &format!("TOPGRADE_PREFIX={}", hostname),
-                "topgrade",
-            ])
-            .check_run()
+        let mut args = vec!["-t", hostname];
+
+        if let Some(ssh_arguments) = ssh_arguments {
+            args.extend(ssh_arguments.split_whitespace());
+        }
+
+        let env = format!("TOPGRADE_PREFIX={}", hostname);
+        args.extend(&["env", &env, "topgrade"]);
+
+        run_type.execute(&ssh).args(&args).check_run()
     }
 }