/usr/lib/python2.7/dist-packages/alembic/config.py is in python-alembic 0.8.8-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from .util.compat import SafeConfigParser
import inspect
import os
import sys
from . import command
from . import util
from . import package_dir
from .util import compat
class Config(object):
"""Represent an Alembic configuration.
Within an ``env.py`` script, this is available
via the :attr:`.EnvironmentContext.config` attribute,
which in turn is available at ``alembic.context``::
from alembic import context
some_param = context.config.get_main_option("my option")
When invoking Alembic programatically, a new
:class:`.Config` can be created by passing
the name of an .ini file to the constructor::
from alembic.config import Config
alembic_cfg = Config("/path/to/yourapp/alembic.ini")
With a :class:`.Config` object, you can then
run Alembic commands programmatically using the directives
in :mod:`alembic.command`.
The :class:`.Config` object can also be constructed without
a filename. Values can be set programmatically, and
new sections will be created as needed::
from alembic.config import Config
alembic_cfg = Config()
alembic_cfg.set_main_option("script_location", "myapp:migrations")
alembic_cfg.set_main_option("url", "postgresql://foo/bar")
alembic_cfg.set_section_option("mysection", "foo", "bar")
.. warning::
When using programmatic configuration, make sure the
``env.py`` file in use is compatible with the target configuration;
including that the call to Python ``logging.fileConfig()`` is
omitted if the programmatic configuration doesn't actually include
logging directives.
For passing non-string values to environments, such as connections and
engines, use the :attr:`.Config.attributes` dictionary::
with engine.begin() as connection:
alembic_cfg.attributes['connection'] = connection
command.upgrade(alembic_cfg, "head")
:param file_: name of the .ini file to open.
:param ini_section: name of the main Alembic section within the
.ini file
:param output_buffer: optional file-like input buffer which
will be passed to the :class:`.MigrationContext` - used to redirect
the output of "offline generation" when using Alembic programmatically.
:param stdout: buffer where the "print" output of commands will be sent.
Defaults to ``sys.stdout``.
.. versionadded:: 0.4
:param config_args: A dictionary of keys and values that will be used
for substitution in the alembic config file. The dictionary as given
is **copied** to a new one, stored locally as the attribute
``.config_args``. When the :attr:`.Config.file_config` attribute is
first invoked, the replacement variable ``here`` will be added to this
dictionary before the dictionary is passed to ``SafeConfigParser()``
to parse the .ini file.
.. versionadded:: 0.7.0
:param attributes: optional dictionary of arbitrary Python keys/values,
which will be populated into the :attr:`.Config.attributes` dictionary.
.. versionadded:: 0.7.5
.. seealso::
:ref:`connection_sharing`
"""
def __init__(self, file_=None, ini_section='alembic', output_buffer=None,
stdout=sys.stdout, cmd_opts=None,
config_args=util.immutabledict(), attributes=None):
"""Construct a new :class:`.Config`
"""
self.config_file_name = file_
self.config_ini_section = ini_section
self.output_buffer = output_buffer
self.stdout = stdout
self.cmd_opts = cmd_opts
self.config_args = dict(config_args)
if attributes:
self.attributes.update(attributes)
cmd_opts = None
"""The command-line options passed to the ``alembic`` script.
Within an ``env.py`` script this can be accessed via the
:attr:`.EnvironmentContext.config` attribute.
.. versionadded:: 0.6.0
.. seealso::
:meth:`.EnvironmentContext.get_x_argument`
"""
config_file_name = None
"""Filesystem path to the .ini file in use."""
config_ini_section = None
"""Name of the config file section to read basic configuration
from. Defaults to ``alembic``, that is the ``[alembic]`` section
of the .ini file. This value is modified using the ``-n/--name``
option to the Alembic runnier.
"""
@util.memoized_property
def attributes(self):
"""A Python dictionary for storage of additional state.
This is a utility dictionary which can include not just strings but
engines, connections, schema objects, or anything else.
Use this to pass objects into an env.py script, such as passing
a :class:`sqlalchemy.engine.base.Connection` when calling
commands from :mod:`alembic.command` programmatically.
.. versionadded:: 0.7.5
.. seealso::
:ref:`connection_sharing`
:paramref:`.Config.attributes`
"""
return {}
def print_stdout(self, text, *arg):
"""Render a message to standard out."""
util.write_outstream(
self.stdout,
(compat.text_type(text) % arg),
"\n"
)
@util.memoized_property
def file_config(self):
"""Return the underlying ``ConfigParser`` object.
Direct access to the .ini file is available here,
though the :meth:`.Config.get_section` and
:meth:`.Config.get_main_option`
methods provide a possibly simpler interface.
"""
if self.config_file_name:
here = os.path.abspath(os.path.dirname(self.config_file_name))
else:
here = ""
self.config_args['here'] = here
file_config = SafeConfigParser(self.config_args)
if self.config_file_name:
file_config.read([self.config_file_name])
else:
file_config.add_section(self.config_ini_section)
return file_config
def get_template_directory(self):
"""Return the directory where Alembic setup templates are found.
This method is used by the alembic ``init`` and ``list_templates``
commands.
"""
return os.path.join(package_dir, 'templates')
def get_section(self, name):
"""Return all the configuration options from a given .ini file section
as a dictionary.
"""
return dict(self.file_config.items(name))
def set_main_option(self, name, value):
"""Set an option programmatically within the 'main' section.
This overrides whatever was in the .ini file.
:param name: name of the value
:param value: the value. Note that this value is passed to
``ConfigParser.set``, which supports variable interpolation using
pyformat (e.g. ``%(some_value)s``). A raw percent sign not part of
an interpolation symbol must therefore be escaped, e.g. ``%%``.
The given value may refer to another value already in the file
using the interpolation format.
"""
self.set_section_option(self.config_ini_section, name, value)
def remove_main_option(self, name):
self.file_config.remove_option(self.config_ini_section, name)
def set_section_option(self, section, name, value):
"""Set an option programmatically within the given section.
The section is created if it doesn't exist already.
The value here will override whatever was in the .ini
file.
:param section: name of the section
:param name: name of the value
:param value: the value. Note that this value is passed to
``ConfigParser.set``, which supports variable interpolation using
pyformat (e.g. ``%(some_value)s``). A raw percent sign not part of
an interpolation symbol must therefore be escaped, e.g. ``%%``.
The given value may refer to another value already in the file
using the interpolation format.
"""
if not self.file_config.has_section(section):
self.file_config.add_section(section)
self.file_config.set(section, name, value)
def get_section_option(self, section, name, default=None):
"""Return an option from the given section of the .ini file.
"""
if not self.file_config.has_section(section):
raise util.CommandError("No config file %r found, or file has no "
"'[%s]' section" %
(self.config_file_name, section))
if self.file_config.has_option(section, name):
return self.file_config.get(section, name)
else:
return default
def get_main_option(self, name, default=None):
"""Return an option from the 'main' section of the .ini file.
This defaults to being a key from the ``[alembic]``
section, unless the ``-n/--name`` flag were used to
indicate a different section.
"""
return self.get_section_option(self.config_ini_section, name, default)
class CommandLine(object):
def __init__(self, prog=None):
self._generate_args(prog)
def _generate_args(self, prog):
def add_options(parser, positional, kwargs):
kwargs_opts = {
'template': (
"-t", "--template",
dict(
default='generic',
type=str,
help="Setup template for use with 'init'"
)
),
'message': (
"-m", "--message",
dict(
type=str,
help="Message string to use with 'revision'")
),
'sql': (
"--sql",
dict(
action="store_true",
help="Don't emit SQL to database - dump to "
"standard output/file instead"
)
),
'tag': (
"--tag",
dict(
type=str,
help="Arbitrary 'tag' name - can be used by "
"custom env.py scripts.")
),
'head': (
"--head",
dict(
type=str,
help="Specify head revision or <branchname>@head "
"to base new revision on."
)
),
'splice': (
"--splice",
dict(
action="store_true",
help="Allow a non-head revision as the "
"'head' to splice onto"
)
),
'depends_on': (
"--depends-on",
dict(
action="append",
help="Specify one or more revision identifiers "
"which this revision should depend on."
)
),
'rev_id': (
"--rev-id",
dict(
type=str,
help="Specify a hardcoded revision id instead of "
"generating one"
)
),
'version_path': (
"--version-path",
dict(
type=str,
help="Specify specific path from config for "
"version file"
)
),
'branch_label': (
"--branch-label",
dict(
type=str,
help="Specify a branch label to apply to the "
"new revision"
)
),
'verbose': (
"-v", "--verbose",
dict(
action="store_true",
help="Use more verbose output"
)
),
'resolve_dependencies': (
'--resolve-dependencies',
dict(
action="store_true",
help="Treat dependency versions as down revisions"
)
),
'autogenerate': (
"--autogenerate",
dict(
action="store_true",
help="Populate revision script with candidate "
"migration operations, based on comparison "
"of database to model.")
),
'head_only': (
"--head-only",
dict(
action="store_true",
help="Deprecated. Use --verbose for "
"additional output")
),
'rev_range': (
"-r", "--rev-range",
dict(
action="store",
help="Specify a revision range; "
"format is [start]:[end]")
)
}
positional_help = {
'directory': "location of scripts directory",
'revision': "revision identifier",
'revisions': "one or more revisions, or 'heads' for all heads"
}
for arg in kwargs:
if arg in kwargs_opts:
args = kwargs_opts[arg]
args, kw = args[0:-1], args[-1]
parser.add_argument(*args, **kw)
for arg in positional:
if arg == "revisions":
subparser.add_argument(
arg, nargs='+', help=positional_help.get(arg))
else:
subparser.add_argument(arg, help=positional_help.get(arg))
parser = ArgumentParser(prog=prog)
parser.add_argument("-c", "--config",
type=str,
default="alembic.ini",
help="Alternate config file")
parser.add_argument("-n", "--name",
type=str,
default="alembic",
help="Name of section in .ini file to "
"use for Alembic config")
parser.add_argument("-x", action="append",
help="Additional arguments consumed by "
"custom env.py scripts, e.g. -x "
"setting1=somesetting -x setting2=somesetting")
parser.add_argument("--raiseerr", action="store_true",
help="Raise a full stack trace on error")
subparsers = parser.add_subparsers()
for fn in [getattr(command, n) for n in dir(command)]:
if inspect.isfunction(fn) and \
fn.__name__[0] != '_' and \
fn.__module__ == 'alembic.command':
spec = inspect.getargspec(fn)
if spec[3]:
positional = spec[0][1:-len(spec[3])]
kwarg = spec[0][-len(spec[3]):]
else:
positional = spec[0][1:]
kwarg = []
subparser = subparsers.add_parser(
fn.__name__,
help=fn.__doc__)
add_options(subparser, positional, kwarg)
subparser.set_defaults(cmd=(fn, positional, kwarg))
self.parser = parser
def run_cmd(self, config, options):
fn, positional, kwarg = options.cmd
try:
fn(config,
*[getattr(options, k) for k in positional],
**dict((k, getattr(options, k)) for k in kwarg)
)
except util.CommandError as e:
if options.raiseerr:
raise
else:
util.err(str(e))
def main(self, argv=None):
options = self.parser.parse_args(argv)
if not hasattr(options, "cmd"):
# see http://bugs.python.org/issue9253, argparse
# behavior changed incompatibly in py3.3
self.parser.error("too few arguments")
else:
cfg = Config(file_=options.config,
ini_section=options.name, cmd_opts=options)
self.run_cmd(cfg, options)
def main(argv=None, prog=None, **kwargs):
"""The console runner function for Alembic."""
CommandLine(prog=prog).main(argv=argv)
if __name__ == '__main__':
main()
|