nmbug-status: Don't require write access

The database in only used for notmuch.Query, so there's no need for
write access.  This allows nmbug-status to run while the database is
being updated, without raising:

  A Xapian exception occurred opening database: Unable to get write lock on …: already locked
  Traceback (most recent call last):
    File "./nmbug-status", line 182, in <module>
      db = notmuch.Database(mode=notmuch.Database.MODE.READ_WRITE)
    File "/…/notmuch/database.py", line 154, in __init__
      self.open(path, mode)
    File "/…/notmuch/database.py", line 214, in open
      raise NotmuchError(status)
  notmuch.errors.XapianError

diff --git a/devel/nmbug/nmbug-status b/devel/nmbug/nmbug-status
index 199892f78711eadf748399c842b80f39a96c3b26..be3e28e7e60c5fbecd5d04a47ee8c69bc738f0ec 100755 (executable)
--- a/devel/nmbug/nmbug-status
+++ b/devel/nmbug/nmbug-status
@@ -180,7 +180,7 @@ else:
 
 # main program
 
-db = notmuch.Database(mode=notmuch.Database.MODE.READ_WRITE)
+db = notmuch.Database(mode=notmuch.Database.MODE.READ_ONLY)
 
 if output_format == 'html':
     print('''<?xml version="1.0" encoding="utf-8" ?>