Syslog panics - gotta catch'm all!syslog-panics

Previously, panics only were printed when run from a shell. Now, on all
systems (so this is tots broken outside linux), panic reports are
shipped to the syslog with a backtrace.

3 files changed, 104 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index a4ae26d2..8d9a209c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -11,6 +11,7 @@ name = "alacritty"
 version = "0.1.0"
 dependencies = [
  "arraydeque 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "base64 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cgmath 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -34,6 +35,7 @@ dependencies = [
  "serde_derive 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_yaml 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syslog 4.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-width 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "vte 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "x11-dl 2.17.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -71,6 +73,27 @@ dependencies = [
 ]
 
 [[package]]
+name = "backtrace"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.37 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "backtrace-sys"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.37 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "base64"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -311,6 +334,14 @@ dependencies = [
 ]
 
 [[package]]
+name = "error-chain"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "euclid"
 version = "0.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -890,6 +921,11 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "rustc-demangle"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "safemem"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1033,6 +1069,18 @@ dependencies = [
 ]
 
 [[package]]
+name = "syslog"
+version = "4.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.37 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unix_socket 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "tempfile"
 version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1126,6 +1174,15 @@ version = "0.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "unix_socket"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.37 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "unreachable"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1353,6 +1410,8 @@ dependencies = [
 "checksum approx 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "08abcc3b4e9339e33a3d0a5ed15d84a687350c05689d825e0f6655eef9e76a94"
 "checksum arraydeque 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "bc059aa8598b9f4fb1dd532a061edc8e4efe0ccc55ba05358aba2a80b7b01f11"
 "checksum atty 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "8352656fd42c30a0c3c89d26dea01e3b77c0ab2af18230835c15e2e13cd51859"
+"checksum backtrace 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea58cd16fd6c9d120b5bcb01d63883ae4cc7ba2aed35c1841b862a3c7ef6639"
+"checksum backtrace-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "44585761d6161b0f57afc49482ab6bd067e4edef48c12a152c237eb0203f7661"
 "checksum base64 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "229d032f1a99302697f10b27167ae6d03d49d032e6a8e2550e8d3fc13356d2b4"
 "checksum bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8dead7461c1127cf637931a1e50934eb6eee8bff2f74433ac7909e9afcee04a3"
 "checksum bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "aad18937a628ec6abcd26d1489012cc0e18c21798210f491af69ded9b881106d"
@@ -1381,6 +1440,7 @@ dependencies = [
 "checksum either 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "740178ddf48b1a9e878e6d6509a1442a2d42fd2928aae8e7a6f8a36fb01981b3"
 "checksum env_logger 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)" = "f3cc21490995c841d68e00276eba02071ebb269ec24011d5728bd00eabd39e31"
 "checksum errno 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "b2c858c42ac0b88532f48fca88b0ed947cad4f1f64d904bcd6c9f138f7b95d70"
+"checksum error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ff511d5dc435d703f4971bc399647c9bc38e20cb41452e3b9feb4765419ed3f3"
 "checksum euclid 0.17.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5069a1354a7eecfdedc97e8e931b1fc455c4d06f5910380a3a049327ca7a0d0a"
 "checksum expat-sys 2.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "c470ccb972f2088549b023db8029ed9da9426f5affbf9b62efff7009ab8ed5b1"
 "checksum filetime 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)" = "714653f3e34871534de23771ac7b26e999651a0a228f47beb324dfdf1dd4b10f"
@@ -1448,6 +1508,7 @@ dependencies = [
 "checksum redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7e891cfe48e9100a70a3b6eb652fef28920c117d366339687bd5576160db0f76"
 "checksum regex 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "5be5347bde0c48cfd8c3fdc0766cdfe9d8a755ef84d620d6794c778c91de8b2b"
 "checksum regex-syntax 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "8e931c58b93d86f080c734bfd2bce7dd0079ae2331235818133c8be7f422e20e"
+"checksum rustc-demangle 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "76d7ba1feafada44f2d38eed812bd2489a03c0f5abb975799251518b68848649"
 "checksum safemem 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e27a8b19b835f7aea908818e871f5cc3a5a186550c30773be987e155e8163d8f"
 "checksum same-file 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "cfb6eded0b06a0b512c8ddbcf04089138c9b4362c2f696f3c3d76039d68f3637"
 "checksum semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a3186ec9e65071a2095434b1f5bb24838d4e8e130f584c790f6033c79943537"
@@ -1467,6 +1528,7 @@ dependencies = [
 "checksum strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb4f380125926a99e52bc279241539c018323fab05ad6368b56f93d9369ff550"
 "checksum syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d3b891b9015c88c576343b9b3e41c2c11a51c219ef067b264bd9c8aa9b441dad"
 "checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
+"checksum syslog 4.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7e5efafb659e873387a9a0e793a09dee1df860c377a54cfecb4af5715d8d51f1"
 "checksum tempfile 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "11ce2fe9db64b842314052e2421ac61a73ce41b898dc8e3750398b219c5fc1e0"
 "checksum termcolor 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "56c456352e44f9f91f774ddeeed27c1ec60a2455ed66d692059acfb1d731bda1"
 "checksum termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "689a3bdfaab439fd92bc87df5c4c78417d3cbe537487274e9b0b2dce76e92096"
@@ -1479,6 +1541,7 @@ dependencies = [
 "checksum unicode-normalization 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "51ccda9ef9efa3f7ef5d91e8f9b83bbe6955f9bf86aec89d5cce2c874625920f"
 "checksum unicode-width 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "bf3a113775714a22dcb774d8ea3655c53a32debae63a063acc00a91cc586245f"
 "checksum unicode-xid 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8c1f860d7d29cf02cb2f3f359fd35991af3d30bac52c57d265a3c461074cb4dc"
+"checksum unix_socket 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "6aa2700417c405c38f5e6902d699345241c28c0b7ade4abaad71e35a87eb1564"
 "checksum unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "382810877fe448991dfc7f0dd6e3ae5d58088fd0ea5e35189655f84e6814fa56"
 "checksum url 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f808aadd8cfec6ef90e4a14eb46f24511824d1ac596b9682703c87056c8678b7"
 "checksum utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "662fab6525a98beff2921d7f61a39e7d59e0b425ebc7d0d9e66d316e55124122"
diff --git a/Cargo.toml b/Cargo.toml
index 68f3ea6b..b8e4819c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -37,6 +37,8 @@ glutin = "0.13"
 clippy = { version = "*", optional = true }
 env_logger = "0.5"
 base64 = "0.9.0"
+syslog = "4.0"
+backtrace = "*"
 
 [target.'cfg(any(target_os = "linux", target_os = "freebsd", target_os="dragonfly", target_os="openbsd"))'.dependencies]
 x11-dl = "2"
diff --git a/src/main.rs b/src/main.rs
index b31f0764..73e3ce09 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -27,6 +27,9 @@ extern crate alacritty;
 
 #[macro_use]
 extern crate log;
+extern crate syslog;
+extern crate libc;
+extern crate backtrace;
 
 use std::error::Error;
 use std::sync::Arc;
@@ -46,11 +49,47 @@ use alacritty::term::{Term};
 use alacritty::tty::{self, process_should_exit};
 use alacritty::util::fmt::Red;
 
+use syslog::{Facility, Formatter3164};
+
 fn main() {
     // Load command line options and config
     let options = cli::Options::load();
     let config = load_config(&options);
 
+    ::std::panic::set_hook(Box::new(|panic_info| {
+        let formatter = Formatter3164 {
+            facility: Facility::LOG_USER,
+            hostname: None,
+            process: "alacritty".into(),
+            pid: unsafe { libc::getpid() as _ },
+        };
+
+        match syslog::unix::<String, _>(formatter) {
+            Err(e)         => println!("impossible to connect to syslog: {:?}", e),
+            Ok(mut writer) => {
+                let mut message = String::new();
+                if let Some(location) = panic_info.location() {
+                    let _ = writer.err(format!("panic occurred in file '{}' at line {}: ",
+                                                location.file(),
+                                                location.line()));
+                }
+
+                if let Some(s) = panic_info.payload().downcast_ref::<&str>() {
+                    let _ = writer.err(s.to_string());
+                } else if let Some(s) = panic_info.payload().downcast_ref::<String>() {
+                    let _ = writer.err(s.to_string());
+                }
+
+                let backtrace = backtrace::Backtrace::new();
+                let backtrace = format!("{:?}", backtrace);
+                for line in backtrace.split('\n') {
+                    let _ = writer.err(line.to_string());
+                }
+
+            }
+        }
+    }));
+
     // Switch to home directory
     #[cfg(target_os = "macos")]
     env::set_current_dir(env::home_dir().unwrap()).unwrap();