Add custom panic hook

The panic hook prints a backtrace, the panic message, file, and line
number, and a plea to report bugs.

Cargo.lock

@@ -81,6 +81,20 @@ dependencies = [
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "backtrace"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace-sys 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "backtrace-sys"
 version = "0.1.11"
@@ -783,6 +797,7 @@ version = "0.1.0"
 dependencies = [
  "docopt 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethkey 0.2.0",
+ "panic_hook 0.1.0",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -818,6 +833,7 @@ version = "0.1.0"
 dependencies = [
  "docopt 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethstore 0.1.0",
+ "panic_hook 0.1.0",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -875,6 +891,7 @@ dependencies = [
  "ethcore 1.8.0",
  "ethcore-util 1.8.0",
  "evm 0.1.0",
+ "panic_hook 0.1.0",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1713,6 +1730,13 @@ dependencies = [
  "stable_deref_trait 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "panic_hook"
+version = "0.1.0"
+dependencies = [
+ "backtrace 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "parity"
 version = "1.7.0"
@@ -1746,6 +1770,7 @@ dependencies = [
  "log 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "number_prefix 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "panic_hook 0.1.0",
  "parity-dapps 1.8.0",
  "parity-hash-fetch 1.8.0",
  "parity-ipfs-api 1.8.0",
@@ -3126,6 +3151,7 @@ dependencies = [
 "checksum aster 0.41.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4ccfdf7355d9db158df68f976ed030ab0f6578af811f5a7bb6dcf221ec24e0e0"
 "checksum atty 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d912da0db7fa85514874458ca3651fe2cddace8d0b0505571dbdcd41ab490159"
 "checksum backtrace 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "346d7644f0b5f9bc73082d3b2236b69a05fd35cce0cfa3724e184e6a5c9e2a2f"
+"checksum backtrace 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "72f9b4182546f4b04ebc4ab7f84948953a118bd6021a1b6a6c909e3e94f6be76"
 "checksum backtrace-sys 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "3a0d842ea781ce92be2bf78a9b38883948542749640b8378b3b2f03d1fd9f1ff"
 "checksum base-x 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2f59103b47307f76e03bef1633aec7fa9e29bfb5aa6daf5a334f94233c71f6c1"
 "checksum base32 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1b9605ba46d61df0410d8ac686b0007add8172eba90e8e909c347856fe794d8c"

Cargo.toml

@@ -53,6 +53,7 @@ parity-rpc-client = { path = "rpc_client" }
 parity-updater = { path = "updater" }
 parity-whisper = { path = "whisper" }
 path = { path = "util/path" }
+panic_hook = { path = "panic_hook" }
 
 parity-dapps = { path = "dapps", optional = true }
 clippy = { version = "0.0.103", optional = true}

ethkey/cli/Cargo.toml

@@ -9,6 +9,7 @@ serde = "1.0"
 serde_derive = "1.0"
 rustc-hex = "1.0"
 docopt = "0.8"
+panic_hook = { path = "../../panic_hook" }
 
 [[bin]]
 name = "ethkey"

ethkey/cli/src/main.rs

@@ -20,6 +20,7 @@ extern crate serde;
 #[macro_use]
 extern crate serde_derive;
 extern crate ethkey;
+extern crate panic_hook;
 
 use std::{env, fmt, process};
 use std::num::ParseIntError;
@@ -155,6 +156,8 @@ impl DisplayMode {
 }
 
 fn main() {
+	panic_hook::set();
+
 	match execute(env::args()) {
 		Ok(ok) => println!("{}", ok),
 		Err(err) => {

ethstore/cli/Cargo.toml

@@ -9,6 +9,7 @@ serde = "1.0"
 serde_derive = "1.0"
 docopt = "0.8"
 ethstore = { path = "../" }
+panic_hook = { path = "../../panic_hook" }
 
 [[bin]]
 name = "ethstore"

ethstore/cli/src/main.rs

@@ -20,6 +20,7 @@ extern crate serde;
 #[macro_use]
 extern crate serde_derive;
 extern crate ethstore;
+extern crate panic_hook;
 
 use std::{env, process, fs, fmt};
 use std::io::Read;
@@ -134,6 +135,8 @@ impl fmt::Display for Error {
 }
 
 fn main() {
+	panic_hook::set();
+
 	match execute(env::args()) {
 		Ok(result) => println!("{}", result),
 		Err(err) => {

evmbin/Cargo.toml

@@ -16,6 +16,7 @@ serde_derive = "1.0"
 ethcore = { path = "../ethcore" }
 ethcore-util = { path = "../util" }
 evm = { path = "../ethcore/evm" }
+panic_hook = { path = "../panic_hook" }
 
 [features]
 evm-debug = ["ethcore/evm-debug-tests"]

evmbin/src/main.rs

@@ -26,6 +26,7 @@ extern crate serde_derive;
 extern crate docopt;
 extern crate ethcore_util as util;
 extern crate evm;
+extern crate panic_hook;
 
 use std::sync::Arc;
 use std::{fmt, fs};
@@ -63,6 +64,8 @@ General options:
 
 
 fn main() {
+	panic_hook::set();
+
 	let args: Args = Docopt::new(USAGE).and_then(|d| d.deserialize()).unwrap_or_else(|e| e.exit());
 
 	if args.flag_json {

panic_hook/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+description = "Parity custom panic hook"
+homepage = "http://parity.io"
+license = "GPL-3.0"
+name = "panic_hook"
+version = "0.1.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+
+[dependencies]
+backtrace = "0.3.2"

panic_hook/src/lib.rs

@@ -0,0 +1,69 @@
+// Copyright 2015-2017 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Custom panic hook with bug report link
+
+extern crate backtrace;
+
+use backtrace::Backtrace;
+use std::io::{self, Write};
+use std::panic::{self, PanicInfo};
+use std::thread;
+
+/// Set the panic hook
+pub fn set() {
+	panic::set_hook(Box::new(panic_hook));
+}
+
+static ABOUT_PANIC: &str = "
+This is a bug. Please report it at:
+
+    https://github.com/paritytech/parity/issues/new
+";
+
+fn panic_hook(info: &PanicInfo) {
+	let location = info.location();
+	let file = location.as_ref().map(|l| l.file()).unwrap_or("<unknown>");
+	let line = location.as_ref().map(|l| l.line()).unwrap_or(0);
+
+	let msg = match info.payload().downcast_ref::<&'static str>() {
+		Some(s) => *s,
+		None => match info.payload().downcast_ref::<String>() {
+			Some(s) => &s[..],
+			None => "Box<Any>",
+		}
+	};
+
+	let thread = thread::current();
+	let name = thread.name().unwrap_or("<unnamed>");
+
+	let backtrace = Backtrace::new();
+
+	let mut stderr = io::stderr();
+
+	let _ = writeln!(stderr, "");
+	let _ = writeln!(stderr, "====================");
+	let _ = writeln!(stderr, "");
+	let _ = writeln!(stderr, "{:?}", backtrace);
+	let _ = writeln!(stderr, "");
+	let _ = writeln!(
+		stderr,
+		"Thread '{}' panicked at '{}', {}:{}",
+		name, msg, file, line
+	);
+
+	let _ = writeln!(stderr, "{}", ABOUT_PANIC);
+}

parity/main.rs

@@ -57,6 +57,7 @@ extern crate ethcore_logger;
 extern crate ethcore_util as util;
 extern crate ethkey;
 extern crate ethsync;
+extern crate panic_hook;
 extern crate parity_hash_fetch as hash_fetch;
 extern crate parity_ipfs_api;
 extern crate parity_local_store as local_store;
@@ -315,8 +316,7 @@ macro_rules! trace_main {
 }
 
 fn main() {
-	// Always print backtrace on panic.
+	panic_hook::set();
-	env::set_var("RUST_BACKTRACE", "1");
 
 	// assuming the user is not running with `--force-direct`, then:
 	// if argv[0] == "parity" and this executable != ~/.parity-updates/parity, run that instead.