Improve missing directory errors.

src/main.rs

@@ -26,7 +26,7 @@ lazy_static! {
     static ref CONFIG: Config = Config::create();
 }
 
-fn main() -> Result<(), ProcessingError> {
+fn main() {
     let config = &CONFIG;
 
     env_logger::Builder::new()
@@ -34,11 +34,15 @@ fn main() -> Result<(), ProcessingError> {
         .format(|buf, record| write!(buf, "{}\n", record.args()))
         .init();
 
-    if config.mode.is_once() {
+    let res = if config.mode.is_once() {
         run_once(config)
     }
     else {
         run_forever(config)
+    };
+
+    if let Err(err) = res {
+        println!("{}\nAborted.", err);
     }
 }
 

src/repository.rs

@@ -69,10 +69,16 @@ impl Repository {
         rsync: bool
     ) -> Result<Self, ProcessingError> {
         if let Err(err) = fs::read_dir(&cache_dir) {
-            return Err(ProcessingError::BadCacheDirectory(err))
+            return Err(ProcessingError::BadCacheDirectory(
+                format!("{}", cache_dir.display()),
+                err
+            ))
         }
         if let Err(err) = fs::read_dir(&tal_dir) {
-            return Err(ProcessingError::BadTalDirectory(err))
+            return Err(ProcessingError::BadTalDirectory(
+                format!("{}", tal_dir.display()),
+                err
+            ))
         }
         Ok(Repository(Arc::new(RepoInner {
             cache_dir,
@@ -718,11 +724,11 @@ fn entry_to_uri_component(entry: &DirEntry) -> Option<Bytes> {
 
 #[derive(Debug, Fail)]
 pub enum ProcessingError {
-    #[fail(display="failed to open repository cache directory: {}", _0)]
-    BadCacheDirectory(io::Error),
+    #[fail(display="failed to open cache directory {}: {}", _0, _1)]
+    BadCacheDirectory(String, io::Error),
 
-    #[fail(display="failed to open trust anchor directory: {}", _0)]
-    BadTalDirectory(io::Error),
+    #[fail(display="failed to open trust anchor directory {}: {}", _0, _1)]
+    BadTalDirectory(String, io::Error),
 
     #[fail(display="{}", _0)]
     Rsync(RsyncError),