fix 332119, crash when unable to create new .msf file, sr=mscott

mailnews/base/resources/locale/en-US/messenger.properties

@@ -111,6 +111,7 @@ verboseFolderFormat=%1$S on %2$S
 filterFolderTruncateFailed=There was an error truncating the Inbox after filtering a message to folder '%1$S'. You may need to shutdown %2$S and delete INBOX.msf.
 
 mailboxTooLarge=The folder %S is full, and can't hold any more messages. To make room for more messages, delete any old or unwanted mail and compact the folder.
+errorGettingDB=Unable to open the summary file for '%S'. Perhaps there was an error on disk, or the full path is too long.
 
 defaultServerTag=(Default)
 useDefaultServer=Use default server

mailnews/db/msgdb/src/nsMsgDatabase.cpp

@@ -174,6 +174,10 @@ NS_IMETHODIMP nsMsgDBService::OpenFolderDB(nsIMsgFolder *aFolder, PRBool aCreate
   return rv;
 }
 
+// This method is called when the caller is trying to create a db without 
+// having a corresponding nsIMsgFolder object.  This happens in a few
+// situatins, including imap folder discovery, compacting local folders, 
+// and copying local folders.
 NS_IMETHODIMP nsMsgDBService::OpenMailDBFromFileSpec(nsIFileSpec *aFolderName, PRBool aCreate, PRBool aLeaveInvalidDB, nsIMsgDatabase** pMessageDB)
 {
   if (!aFolderName)
@@ -190,6 +194,8 @@ NS_IMETHODIMP nsMsgDBService::OpenMailDBFromFileSpec(nsIFileSpec *aFolderName, P
   nsCOMPtr <nsIMsgDatabase> msgDB = do_CreateInstance(NS_MAILBOXDB_CONTRACTID, &rv);
   NS_ENSURE_SUCCESS(rv, rv);
   rv = msgDB->Open(aFolderName, aCreate, aLeaveInvalidDB);
+  if (rv == NS_ERROR_FILE_TARGET_DOES_NOT_EXIST)
+    return rv;
   NS_IF_ADDREF(*pMessageDB = msgDB);
   if (aCreate && msgDB && rv == NS_MSG_ERROR_FOLDER_SUMMARY_MISSING)
     rv = NS_OK;
@@ -1111,6 +1117,8 @@ NS_IMETHODIMP nsMsgDatabase::Open(nsIFileSpec *aFolderName, PRBool aCreate, PRBo
   summaryFileExists = summaryFile.Exists()  && summaryFile.GetFileSize() > 0;
   
   err = OpenMDB((const char *) summaryFile, aCreate);
+  if (err == NS_ERROR_FILE_TARGET_DOES_NOT_EXIST)
+    return err;
 
   if (NS_SUCCEEDED(err))
   {
@@ -1262,6 +1270,8 @@ nsresult nsMsgDatabase::OpenMDB(const char *dbName, PRBool create)
       {
         nsIMdbFile* newFile = 0;
         ret = myMDBFactory->CreateNewFile(m_mdbEnv, dbHeap, dbName, &newFile);
+        if (NS_FAILED(ret))
+          ret = NS_ERROR_FILE_TARGET_DOES_NOT_EXIST;
         if ( newFile )
         {
           if (ret == NS_OK)

mailnews/imap/src/nsImapMailFolder.cpp

@@ -764,7 +764,11 @@ nsImapMailFolder::UpdateFolder(nsIMsgWindow *msgWindow)
     selectFolder = PR_FALSE;
   }
   rv = GetDatabase(msgWindow);
-  
+  if (NS_FAILED(rv))
+  {
+    ThrowAlertMsg("errorGettingDB", msgWindow);
+    return rv;
+  }
   PRBool canOpenThisFolder = PR_TRUE;
   GetCanIOpenThisFolder(&canOpenThisFolder);