Add support for changing cwd of server, which starts at / by default when launched over ssh

src/opt.rs

@@ -339,10 +339,14 @@ pub struct ListenSubcommand {
     #[structopt(short = "6", long)]
     pub use_ipv6: bool,
 
-    /// Maximum capacity for concurrent message handling by the server
+    /// Maximum capacity for concurrent message handled by the server
     #[structopt(long, default_value = "1000")]
     pub max_msg_capacity: u16,
 
+    /// Changes the current working directory (cwd) to the specified directory
+    #[structopt(long)]
+    pub current_dir: Option<PathBuf>,
+
     /// Set the port(s) that the server will attempt to bind to
     ///
     /// This can be in the form of PORT1 or PORT1:PORTN to provide a range of ports.

src/subcommand/listen/mod.rs

@@ -88,6 +88,12 @@ async fn run_async(cmd: ListenSubcommand, _opt: CommonOpt, is_forked: bool) -> R
     let addr = cmd.host.to_ip_addr(cmd.use_ipv6)?;
     let socket_addrs = cmd.port.make_socket_addrs(addr);
 
+    // If specified, change the current working directory of this program
+    if let Some(path) = cmd.current_dir.as_ref() {
+        debug!("Setting current directory to {:?}", path);
+        std::env::set_current_dir(path)?;
+    }
+
     debug!("Binding to {} in range {}", addr, cmd.port);
     let listener = TcpListener::bind(socket_addrs.as_slice()).await?;