add PKGBUILD, and search for config in /etc

PKGBUILD

@@ -0,0 +1,32 @@
+# Maintainer: eta <eta@theta.eu.org>
+pkgname=sms-irc-git
+pkgver=r138.e62a533
+pkgrel=1
+pkgdesc="A WhatsApp Web and SMS bridge for internet relay chat (IRC)."
+arch=('x86_64')
+url="https://git.theta.eu.org/sms-irc.git/about/"
+license=('AGPL3')
+depends=('postgresql-libs')
+makedepends=('rust' 'cargo')
+provides=('sms-irc')
+conflicts=('sms-irc')
+backup=('etc/sms-irc.conf')
+optdepends=('inspircd: IRC server to bridge into')
+options=()
+changelog=
+source=('git+https://git.theta.eu.org/sms-irc.git/')
+md5sums=('SKIP')
+noextract=()
+_gitname="sms-irc"
+
+pkgver() {
+	cd "$srcdir/$_gitname"
+	printf "r%s.%s" $(git rev-list --count HEAD) $(git rev-parse --short HEAD)
+}
+
+package() {
+	cd "$srcdir/$_gitname"
+	install -Dm644 config.example.toml "$pkgdir/etc/sms-irc.conf"
+	cargo install --path . --root="$pkgdir/usr" --locked
+	rm "$pkgdir/usr/.crates.toml"
+}

src/main.rs

@@ -39,6 +39,7 @@ use tokio_core::reactor::Core;
 use crate::insp_s2s::InspLink;
 use crate::whatsapp::WhatsappManager;
 use tokio_signal::unix::{Signal, SIGHUP};
+use std::path::Path;
 
 fn main() -> Result<(), failure::Error> {
     eprintln!("[*] sms-irc version {}", env!("CARGO_PKG_VERSION"));
@@ -46,10 +47,25 @@ fn main() -> Result<(), failure::Error> {
 
     let config_path = ::std::env::var("SMSIRC_CONFIG");
     let is_def = config_path.is_ok();
-    let config_path = config_path
-        .unwrap_or("config.toml".to_string());
+    let config_path = match config_path {
+        Ok(p) => p,
+        _ => {
+            if Path::new("config.toml").exists() {
+                "config.toml".to_string()
+            }
+            else if Path::new("/etc/sms-irc.conf").exists() {
+                "/etc/sms-irc.conf".to_string()
+            }
+            else {
+                eprintln!("[!] *** I can't find a configuration file! ***");
+                eprintln!("[!] Please place one either at ./config.toml or /etc/sms-irc.conf...");
+                eprintln!("[!] ...or set the SMSIRC_CONFIG environment variable to point to one!");
+                panic!("Cannot find a configuration file!");
+            }
+        }
+    };
     eprintln!("[+] Reading configuration file from file '{}'...", config_path);
-    if is_def {
+    if !is_def {
         eprintln!("[*] (Set the SMSIRC_CONFIG environment variable to change this.)");
     }
     let config: Config = toml::from_str(&::std::fs::read_to_string(config_path)?)?;