[Monotone-devel] Issue 130 - databse-optional commands require a database now (monotone)

[code]

Hello,

A new issue has been created and assigned
to you:

130 - databse-optional commands require a database now
Project: monotone
Status: New
Reported by: Timothy Brownawell
Labels:
 Type:Incorrect Behavior
 Priority:Medium

Description:

Steps to reproduce the problem:
-------------------------------

1. mtn privkey $KEY --no-workspace
2. mtn genkey address@hidden --no-workspace
3. mtn ls keys --no-workspace

Expected result:
----------------
Those should all work.

Actual results:
---------------
mtn: misuse: no database specified

Output of `mtn version --full`:
-------------------------------
3903ea47e7b1a656e0695f10d57bc0e9deca205b (current head; probably broken by the 
"don't assume :memory:" fix)

There is a database::database_specified() that a few places use to check 
whether there really is a db. Previously constructing a database object without 
an actual database would work, and it would only error out when you tried to 
use it. Possibly instead we want something like

class maybe_database {
  // we own it
  shared_ptr<database> const _db;
  // we don't own it
  database * const __db;
public:
  explicit maybe_database(app_state & app)
    : _db(app.opts.dbname_given ? new database(app) : 0),
      __db(0) { }
  /*explicit*/ maybe_database(database & db)
    : __db(&db) { }
  bool exists() const { return _db || __db; }
  database & get() const {
    if (_db) return *_db;
    if (__db) return *__db;
    I(false);
  }
};

and then things that currently call database::database_specified() would 
instead accept one of these.

--
Issue: https://code.monotone.ca/p/monotone/issues/130/