signals: Move signal handling to its own crate

We're going to share this code with `radicle-term`.

Cargo.lock

@@ -2551,6 +2551,7 @@ dependencies = [
  "radicle-crypto",
  "radicle-fetch",
  "radicle-git-ext",
+ "radicle-signals",
  "scrypt",
  "serde",
  "serde_json",
@@ -2572,6 +2573,14 @@ dependencies = [
  "thiserror",
 ]
 
+[[package]]
+name = "radicle-signals"
+version = "0.9.0"
+dependencies = [
+ "crossbeam-channel",
+ "libc",
+]
+
 [[package]]
 name = "radicle-ssh"
 version = "0.9.0"

Cargo.toml

@@ -14,6 +14,7 @@ members = [
   "radicle-remote-helper",
   "radicle-ssh",
   "radicle-tools",
+  "radicle-signals",
 ]
 default-members = [
   "radicle",
@@ -25,6 +26,7 @@ default-members = [
   "radicle-ssh",
   "radicle-remote-helper",
   "radicle-term",
+  "radicle-signals",
 ]
 resolver = "2"
 

radicle-node/Cargo.toml

@@ -50,6 +50,10 @@ features = ["logger"]
 path = "../radicle-fetch"
 version = "0.9.0"
 
+[dependencies.radicle-signals]
+path = "../radicle-signals"
+version = "0"
+
 [dev-dependencies]
 radicle = { path = "../radicle", version = "0", features = ["test"] }
 radicle-crypto = { path = "../radicle-crypto", version = "0", features = ["test", "cyphernet"] }

radicle-node/src/lib.rs

@@ -3,7 +3,6 @@ pub mod control;
 pub mod deserializer;
 pub mod runtime;
 pub mod service;
-pub mod signals;
 #[cfg(any(test, feature = "test"))]
 pub mod test;
 #[cfg(test)]

radicle-node/src/main.rs

@@ -9,8 +9,8 @@ use radicle::prelude::Signer;
 use radicle::profile;
 use radicle::version::Version;
 use radicle_node::crypto::ssh::keystore::{Keystore, MemorySigner};
-use radicle_node::signals;
 use radicle_node::Runtime;
+use radicle_signals as signals;
 
 pub const VERSION: Version = Version {
     name: env!("CARGO_PKG_NAME"),

radicle-node/src/runtime.rs

@@ -10,6 +10,7 @@ use crossbeam_channel as chan;
 use cyphernet::Ecdh;
 use netservices::resource::NetAccept;
 use radicle_fetch::FetchLimit;
+use radicle_signals::Signal;
 use reactor::poller::popol;
 use reactor::Reactor;
 use thiserror::Error;
@@ -128,7 +129,7 @@ pub struct Runtime {
     pub reactor: Reactor<wire::Control, popol::Poller>,
     pub pool: worker::Pool,
     pub local_addrs: Vec<net::SocketAddr>,
-    pub signals: chan::Receiver<()>,
+    pub signals: chan::Receiver<Signal>,
 }
 
 impl Runtime {
@@ -139,7 +140,7 @@ impl Runtime {
         home: Home,
         config: service::Config,
         listen: Vec<net::SocketAddr>,
-        signals: chan::Receiver<()>,
+        signals: chan::Receiver<Signal>,
         signer: G,
     ) -> Result<Runtime, Error>
     where
@@ -306,7 +307,7 @@ impl Runtime {
             || control::listen(self.control, handle)
         });
         let _signals = thread::spawn(&self.id, "signals", move || {
-            if let Ok(()) = self.signals.recv() {
+            if let Ok(Signal::Terminate | Signal::Interrupt) = self.signals.recv() {
                 log::info!(target: "node", "Termination signal received; shutting down..");
                 self.handle.shutdown().ok();
             }

radicle-signals/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "radicle-signals"
+homepage = "https://radicle.xyz"
+repository = "https://app.radicle.xyz/seeds/seed.radicle.xyz/rad:z3gqcJUoA1n9HaHKufZs5FCSGazv5"
+edition = "2021"
+version = "0.9.0"
+
+[dependencies]
+crossbeam-channel = { version = "0.5.6" }
+libc = { version = "0.2" }

radicle-signals/src/lib.rs

@@ -3,11 +3,38 @@ use std::sync::Mutex;
 
 use crossbeam_channel as chan;
 
-/// Signal notifications are sent via this channel.
-static NOTIFY: Mutex<Option<chan::Sender<()>>> = Mutex::new(None);
+/// Operating system signal.
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum Signal {
+    /// `SIGINT`.
+    Interrupt,
+    /// `SIGTERM`.
+    Terminate,
+    /// `SIGHUP`.
+    Hangup,
+    /// `SIGWINCH`.
+    WindowChanged,
+}
 
-/// Install global signal handlers for `SIGTERM` and `SIGINT`.
-pub fn install(notify: chan::Sender<()>) -> io::Result<()> {
+impl TryFrom<i32> for Signal {
+    type Error = i32;
+
+    fn try_from(value: i32) -> Result<Self, Self::Error> {
+        match value {
+            libc::SIGTERM => Ok(Self::Terminate),
+            libc::SIGINT => Ok(Self::Interrupt),
+            libc::SIGWINCH => Ok(Self::WindowChanged),
+            libc::SIGHUP => Ok(Self::Hangup),
+            _ => Err(value),
+        }
+    }
+}
+
+/// Signal notifications are sent via this channel.
+static NOTIFY: Mutex<Option<chan::Sender<Signal>>> = Mutex::new(None);
+
+/// Install global signal handlers.
+pub fn install(notify: chan::Sender<Signal>) -> io::Result<()> {
     if let Ok(mut channel) = NOTIFY.try_lock() {
         if channel.is_some() {
             return Err(io::Error::new(
@@ -27,7 +54,7 @@ pub fn install(notify: chan::Sender<()>) -> io::Result<()> {
     Ok(())
 }
 
-/// Install global signal handlers for `SIGTERM` and `SIGINT`.
+/// Install global signal handlers.
 ///
 /// # Safety
 ///
@@ -39,17 +66,23 @@ unsafe fn _install() -> io::Result<()> {
     if libc::signal(libc::SIGINT, handler as libc::sighandler_t) == libc::SIG_ERR {
         return Err(io::Error::last_os_error());
     }
+    if libc::signal(libc::SIGHUP, handler as libc::sighandler_t) == libc::SIG_ERR {
+        return Err(io::Error::last_os_error());
+    }
+    if libc::signal(libc::SIGWINCH, handler as libc::sighandler_t) == libc::SIG_ERR {
+        return Err(io::Error::last_os_error());
+    }
     Ok(())
 }
 
 /// Called by `libc` when a signal is received.
 extern "C" fn handler(sig: libc::c_int, _info: *mut libc::siginfo_t, _data: *mut libc::c_void) {
-    if sig != libc::SIGTERM && sig != libc::SIGINT {
+    let Ok(sig) = sig.try_into() else {
         return;
-    }
+    };
     if let Ok(guard) = NOTIFY.try_lock() {
         if let Some(c) = &*guard {
-            c.try_send(()).ok();
+            c.try_send(sig).ok();
         }
     }
 }