feat: shut down gracefully with ctrl+c (#1364)

If you have a long-running process, like `webdav` or `backup` or others,
pressing CTRL+C usually results in a non-zero exit code:

`process didn't exit successfully:
P:\CARGO\.cargo-target-win\debug\rustic.exe -P <PROFILE> webdav (exit
code: 0xc000013a, STATUS_CONTROL_C_EXIT)`

This shouldn't be the case, as it was user initiated and we can shut
down gracefully.

This PR adds this functionality, so CTRL+C shuts down `rustic`
gracefully and exits with a 0 exit-code.

---------

Signed-off-by: simonsan <[email protected]>
Co-authored-by: aawsome <[email protected]>

Author: simonsan

Cargo.lock

@@ -103,6 +103,7 @@ clap = { version = "4", features = ["derive", "env", "wrap_help"] }
 clap_complete = "4"
 conflate = "0.3.3"
 convert_case = "0.6.0"
+ctrlc = { version = "3.4.5", features = ["termination"] }
 dateparser = "0.2.1"
 derive_more = { version = "1", features = ["debug"] }
 dialoguer = "0.11.0"

Cargo.toml

@@ -35,6 +35,7 @@ use std::fmt::Debug;
 use std::fs::File;
 use std::path::PathBuf;
 use std::str::FromStr;
+use std::sync::mpsc::channel;
 
 #[cfg(feature = "mount")]
 use crate::commands::mount::MountCmd;
@@ -64,7 +65,7 @@ use clap::builder::{
 };
 use convert_case::{Case, Casing};
 use human_panic::setup_panic;
-use log::{log, Level};
+use log::{info, log, Level};
 use simplelog::{CombinedLogger, LevelFilter, TermLogger, TerminalMode, WriteLogger};
 
 use self::find::FindCmd;
@@ -179,6 +180,20 @@ impl Runnable for EntryPoint {
         // Set up panic hook for better error messages and logs
         setup_panic!();
 
+        // Set up Ctrl-C handler
+        let (tx, rx) = channel();
+
+        ctrlc::set_handler(move || tx.send(()).expect("Could not send signal on channel."))
+            .expect("Error setting Ctrl-C handler");
+
+        _ = std::thread::spawn(move || {
+            // Wait for Ctrl-C
+            rx.recv().expect("Could not receive from channel.");
+            info!("Ctrl-C received, shutting down...");
+            RUSTIC_APP.shutdown(Shutdown::Graceful)
+        });
+
+        // Run the subcommand
         self.commands.run();
         RUSTIC_APP.shutdown(Shutdown::Graceful)
     }