Add feature to compile early panics

Do debug printing when drop of FileLockEntry failed.

imag-store/Cargo.toml

@@ -34,3 +34,6 @@ path = "../libimagutil"
 [dependencies.libimagerror]
 path = "../libimagerror"
 
+[features]
+early-panic = [ "libimagstore/early-panic" ]
+

libimagstore/Cargo.toml

@@ -39,3 +39,8 @@ env_logger = "0.3"
 default = []
 verify  = []
 
+# Enable panic!()s if critical errors occur.
+# Can be used to debug the store more intensly via the imag-store commandline
+# application
+early-panic=[]
+

libimagstore/src/lib.rs

@@ -46,6 +46,8 @@ extern crate walkdir;
 #[macro_use] extern crate libimagerror;
 #[macro_use] extern crate libimagutil;
 
+#[macro_use] mod util;
+
 pub mod storeid;
 pub mod error;
 pub mod hook;

libimagstore/src/store.rs

@@ -942,7 +942,15 @@ impl<'a> DerefMut for FileLockEntry<'a> {
 impl<'a> Drop for FileLockEntry<'a> {
     /// This will silently ignore errors, use `Store::update` if you want to catch the errors
     fn drop(&mut self) {
-        let _ = self.store._update(self, true);
+        use libimagerror::trace::trace_error_dbg;
+
+        match self.store._update(self, true) {
+            Err(e) => {
+                trace_error_dbg(&e);
+                if_cfg_panic!("ERROR WHILE DROPPING: {:?}", e);
+            },
+            Ok(_) => { },
+        }
     }
 }
 

libimagstore/src/util.rs

@@ -0,0 +1,35 @@
+//
+// imag - the personal information management suite for the commandline
+// Copyright (C) 2015, 2016 Matthias Beyer <mail@beyermatthias.de> and contributors
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; version
+// 2.1 of the License.
+//
+// This library 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
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+//
+
+#[cfg(feature = "early-panic")]
+#[macro_export]
+macro_rules! if_cfg_panic {
+    ()                       => { panic!() };
+    ($msg:expr)              => { panic!($msg) };
+    ($fmt:expr, $($arg:tt)+) => { panic!($fmt, $($($arg),*)) };
+}
+
+#[cfg(not(feature = "early-panic"))]
+#[macro_export]
+macro_rules! if_cfg_panic {
+    ()                       => { };
+    ($msg:expr)              => { };
+    ($fmt:expr, $($arg:tt)+) => { };
+}
+