journal: set Abort hint when failing due to an abandoned transaction

mercurial/localrepo.py

@@ -857,7 +857,8 b' class localrepository(object):'
         # abort here if the journal already exists
         if self.svfs.exists("journal"):
             raise error.RepoError(
-                _("abandoned transaction found - run hg recover"))
+                _("abandoned transaction found"),
+                hint=_("run 'hg recover' to clean up transaction"))
 
         def onclose():
             self.store.write(tr)

tests/test-journal-exists.t

@@ -9,7 +9,8 b''
 
   $ echo foo > a
   $ hg ci -Am0
-  abort: abandoned transaction found - run hg recover!
+  abort: abandoned transaction found!
+  (run 'hg recover' to clean up transaction)
   [255]
 
   $ hg recover