Improve error information when there are problems in the local storage

[Sergio Villar Senin <svillar igalia com>]

Hi,

this patch sets the proper error when the folder summary code is not
capable of storing the summary due to problems in the local storage.

Br

Index: libtinymail-camel/camel-lite/camel/camel-folder-summary.c
===================================================================
--- libtinymail-camel/camel-lite/camel/camel-folder-summary.c	(revision 3494)
+++ libtinymail-camel/camel-lite/camel/camel-folder-summary.c	(working copy)
@@ -923,7 +923,7 @@
 		i = errno;
 		g_unlink(path);
 		errno = i;
- 		camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+ 		camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM_IO_WRITE,
 			"Error storing the summary");
 		g_static_rec_mutex_unlock (s->dump_lock);
 		return -1;
@@ -1024,7 +1024,7 @@
 
 exception:
 
-	camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+	camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM_IO_WRITE,
 		"Error storing the summary");
 	i = errno;
 	fclose (out);
@@ -1064,7 +1064,7 @@
 
 	if (fd == -1) {
 	  g_static_rec_mutex_unlock (s->dump_lock);
-	  camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+	  camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM_IO_WRITE,
 		"Error storing the summary");
 	  return -1;
 	}
@@ -1075,7 +1075,7 @@
 		g_unlink(path);
 		close(fd);
 		errno = i;
- 		camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+ 		camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM_IO_WRITE,
 			"Error storing the summary");
 		g_static_rec_mutex_unlock (s->dump_lock);
 		return -1;
@@ -1147,7 +1147,7 @@
 		i = errno;
 		g_unlink(path);
 		errno = i;
-		camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+		camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM_IO_WRITE,
 			"Error storing the summary");
 		g_static_mutex_unlock (&global_lock2);
 		g_static_rec_mutex_unlock (&global_lock);
@@ -1172,7 +1172,7 @@
 
 exception:
 
-	camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
+	camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM_IO_WRITE,
 		"Error storing the summary");
 	i = errno;
 	fclose (out);