----

kirr: factor running `zodb ...` into zodbrun + add test for `zodb -h`.

Added test currently passes on py2, but fails on py3:

	out = <_io.TextIOWrapper encoding='UTF-8'>

	    def usage(out):
	        print("""\
	    Zodb is a tool for managing ZODB databases.

	    Usage:

	        zodb command [arguments]

	    The commands are:
	    """, file=out)

	        cmdv = command_dict.keys()
	>       cmdv.sort()
	E       AttributeError: 'dict_keys' object has no attribute 'sort'

	zodbtools/zodb.py:55: AttributeError

It will be fixed in the next patch.

/reviewed-on nexedi/zodbtools!10

We will likely need this reader for `zodb restore` in the future.
We will also use this reader for `zodb commit` in the next patch.

pygolang dependency v↑ becuase we use recently introduced
golang.strconv to unquote user/desc/extension strings.

Python2 works. Python3 support is only minimal and incomplete.

I originally added escapeqq as part of 75c03368 (zodbdump: Start to
stabilize output format) with the task for this utility to quote string
into valid "..." string always quoted with ".

This utility was later copied to pygolang:

	pygolang@afa46cf5

and then further improved there to work under both Python2 and Python3
and to not escape printable UTF-8 characters:

	pygolang@02dddb97

So stop the duplication and simply switch to the better version.

Since zodbdump start (c0a6299f "zodbdump - Tool to dump content of a
ZODB database   (draft)") and up till now zodbdump output format was not
good. For example user and description transaction properties were
output without proper quoting, which in situation when there would be
fancy characters in there would break the output.

So start the format stabilization:

- user and description are output as quoted, so now they are guaranteed
  to be on one line. The quoting character is always " (instead of e.g.
  smartly quoting either by ' or " as python does) for easier
  compatibility with ZODB implementations in other languages.

- transaction extension is now printed as raw bytes, not as dict.
  The idea here is that `zodb dump`

  * should perform dump of raw data as stored inside ZODB so that later
    `zodb restore` could restore the database identically to the same state.

  * we should dump raw data instead of unpickled ones because generally
    on-disk extension's format can be any raw bytes and this information
    should be preserved.

- transaction status is now also output as quoted to preserve line
  breakage on fancy status codes.

- it is documented that sha1 is not the only allowed hash function that
  might be used.

- in hashonly mode we add trailing " -" to obj string so that it is
  possible to distinguish outputs of `zodb dump` and `zodb dump -hashonly`
  without knowing a-priory the way it was produced.

  The reason to do so is that it would be not good to e.g. by accident
  feed hashonly output to (future) `zodb restore`, which, without having
  a way to see it should not consume object data would read following
  transaction information as raw object data with confusing later
  errors (and a small chance to restore completely different database
  without reporting error at all).

Because ZODB iteration API gives us already unpickled extension and only
that, for now to dump it as raw we get a long road to pickle it back
also caring to try to pickle in stable order.

Hopefully this will be only a fallback because of

https://github.com/zopefoundation/ZODB/pull/183

and next zodbtools patch.

~~~~

For testing purposes (currently only quoting function unit test) py.test
usage is introduced.

The code is also generally polished here and there.

Most of our tools need only read access for working. However e.g.
FileStorage, when opened in read-write mode, automatically creates
database file and index.

This way if database is opened in read-write mode a simple typo in path,
e.g. to `zodb dump path` would lead to:

- new database at path will be created
- the dump will print nothing (empty database)
- exit status will be 0 (ok) and no error will be reported.

For this reason it is better tools declare access level they need so for
read-only access request we can catch it with an error from storage.

This, however, requires quite recent ZODB to work:

https://github.com/zopefoundation/ZODB/pull/153

P.S.

We don't want to force users to always specify read-only in URLs or
zconf files because:

- this is error prone
- URL or zconf can be though as of file
- when a program opens a file the program, not file, declares which type
  of access it wants.

That's why access mode declaration has to be internal.

Previously for specifying a storage we were requiring users to create
zconfig file and put information about storage there. This is not always
convenient e.g. for quickly inspecting a file storage or a NEO instance
here and there for which address and name is already at hand.

So thanks to zodburi we can switch to specifying storages by URL without
loosing generality as there is still zconfig:// schema which allows to
configure storages zconfig way.

P.S. for convenience we allow paths without schema to be treated as
    FileStorage (i.e. file:// schema is implicitly used).

P.P.S. zodbanalyze is not affected (for now ?) as it currently
    works with FileStorage only.

[1] http://docs.pylonsproject.org/projects/zodburi/

We already have 3 commands in zodbtools suite (zodbanalyze, zodbdump &
zodbcmp) and this is going to grow. And it was already noted some time
ago with TODO (in 66946b8d) that we need only one command driver to
invoke everything.

So do it: introduce `zodb` command which can invoke other subcommands
and show general help or help for subcommand or a topic.

The structure is modelled after `git` and `go` commands. Help topics
are for now empty but we'll add one help topic in the next patch.

- Nexedi adheres to GPLv3+ with wide exception for Free/Open-source
  software. Use this for our original work.

- Zodbanalyze was initially developed by Zope corp & co. See

  d86d04dc	(initial copy of ZODB3-3.9.7's ZODB/scripts/analyze.py.)
  ab17cf2d	(Hook in Nexedi's zodbanalyze)

  So follow original Zope's licensing terms for zodbanalyze.

The package was named zodbtools from start (see fd6ad1b9 "Start of
zodbtools.git"). However in 66a03ae5 I've made a thinko naming some
parts as zodbtool.

Fix the confusion and name things uniformly as zodbtools.

/reviewed-by TrustMe

zodbanalyze was added in 1e506a81 and ab17cf2d.

/reviewed-on nexedi/zodbtools!1
/see-also nexedi/slapos!116

WARNING output format is not stable yet.

This is a tool to compare two ZODB databases in between tidmin..tidmax
transaction range with default range being -∞..+∞ - (whole database).

For comparision both databases are scanned at storage layer and every
transaction content is compared bit-to-bit between the two. The program stops
either at first difference found, or when whole requested transaction range is
scanned with no difference detected.

Database storages are specified in files with ZConfig-based storage definition, e.g.

    %import neo.client
    <NEOStorage>
        master_nodes    ...
        name            ...
    </NEOStorage>

Please see nexedi/neoppod!4 for
one of possible contexts.

The tool is generic though and is not NEO-specific. It should be able to
even check two different storages like ZEO & NEO, or FileStorage and NEO
etc and thus can be handy.

TODO tests