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596 lines
20 KiB
596 lines
20 KiB
1 year ago
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from __future__ import annotations
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from argparse import ArgumentParser
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from argparse import Namespace
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from configparser import ConfigParser
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import inspect
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import os
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import sys
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from typing import Dict
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from typing import Optional
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from typing import overload
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from typing import TextIO
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from typing import Union
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from . import __version__
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from . import command
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from . import util
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from .util import compat
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class Config:
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r"""Represent an Alembic configuration.
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Within an ``env.py`` script, this is available
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via the :attr:`.EnvironmentContext.config` attribute,
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which in turn is available at ``alembic.context``::
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from alembic import context
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some_param = context.config.get_main_option("my option")
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When invoking Alembic programatically, a new
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:class:`.Config` can be created by passing
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the name of an .ini file to the constructor::
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from alembic.config import Config
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alembic_cfg = Config("/path/to/yourapp/alembic.ini")
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With a :class:`.Config` object, you can then
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run Alembic commands programmatically using the directives
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in :mod:`alembic.command`.
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The :class:`.Config` object can also be constructed without
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a filename. Values can be set programmatically, and
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new sections will be created as needed::
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from alembic.config import Config
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alembic_cfg = Config()
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alembic_cfg.set_main_option("script_location", "myapp:migrations")
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alembic_cfg.set_main_option("sqlalchemy.url", "postgresql://foo/bar")
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alembic_cfg.set_section_option("mysection", "foo", "bar")
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.. warning::
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When using programmatic configuration, make sure the
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``env.py`` file in use is compatible with the target configuration;
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including that the call to Python ``logging.fileConfig()`` is
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omitted if the programmatic configuration doesn't actually include
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logging directives.
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For passing non-string values to environments, such as connections and
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engines, use the :attr:`.Config.attributes` dictionary::
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with engine.begin() as connection:
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alembic_cfg.attributes['connection'] = connection
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command.upgrade(alembic_cfg, "head")
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:param file\_: name of the .ini file to open.
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:param ini_section: name of the main Alembic section within the
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.ini file
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:param output_buffer: optional file-like input buffer which
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will be passed to the :class:`.MigrationContext` - used to redirect
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the output of "offline generation" when using Alembic programmatically.
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:param stdout: buffer where the "print" output of commands will be sent.
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Defaults to ``sys.stdout``.
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:param config_args: A dictionary of keys and values that will be used
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for substitution in the alembic config file. The dictionary as given
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is **copied** to a new one, stored locally as the attribute
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``.config_args``. When the :attr:`.Config.file_config` attribute is
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first invoked, the replacement variable ``here`` will be added to this
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dictionary before the dictionary is passed to ``ConfigParser()``
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to parse the .ini file.
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:param attributes: optional dictionary of arbitrary Python keys/values,
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which will be populated into the :attr:`.Config.attributes` dictionary.
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.. seealso::
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:ref:`connection_sharing`
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"""
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def __init__(
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self,
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file_: Union[str, os.PathLike[str], None] = None,
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ini_section: str = "alembic",
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output_buffer: Optional[TextIO] = None,
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stdout: TextIO = sys.stdout,
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cmd_opts: Optional[Namespace] = None,
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config_args: util.immutabledict = util.immutabledict(),
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attributes: Optional[dict] = None,
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) -> None:
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"""Construct a new :class:`.Config`"""
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self.config_file_name = file_
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self.config_ini_section = ini_section
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self.output_buffer = output_buffer
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self.stdout = stdout
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self.cmd_opts = cmd_opts
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self.config_args = dict(config_args)
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if attributes:
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self.attributes.update(attributes)
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cmd_opts: Optional[Namespace] = None
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"""The command-line options passed to the ``alembic`` script.
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Within an ``env.py`` script this can be accessed via the
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:attr:`.EnvironmentContext.config` attribute.
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.. seealso::
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:meth:`.EnvironmentContext.get_x_argument`
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"""
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config_file_name: Union[str, os.PathLike[str], None] = None
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"""Filesystem path to the .ini file in use."""
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config_ini_section: str = None # type:ignore[assignment]
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"""Name of the config file section to read basic configuration
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from. Defaults to ``alembic``, that is the ``[alembic]`` section
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of the .ini file. This value is modified using the ``-n/--name``
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option to the Alembic runner.
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"""
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@util.memoized_property
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def attributes(self):
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"""A Python dictionary for storage of additional state.
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This is a utility dictionary which can include not just strings but
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engines, connections, schema objects, or anything else.
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Use this to pass objects into an env.py script, such as passing
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a :class:`sqlalchemy.engine.base.Connection` when calling
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commands from :mod:`alembic.command` programmatically.
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.. seealso::
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:ref:`connection_sharing`
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:paramref:`.Config.attributes`
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"""
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return {}
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def print_stdout(self, text: str, *arg) -> None:
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"""Render a message to standard out.
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When :meth:`.Config.print_stdout` is called with additional args
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those arguments will formatted against the provided text,
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otherwise we simply output the provided text verbatim.
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e.g.::
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>>> config.print_stdout('Some text %s', 'arg')
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Some Text arg
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"""
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if arg:
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output = str(text) % arg
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else:
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output = str(text)
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util.write_outstream(self.stdout, output, "\n")
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@util.memoized_property
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def file_config(self):
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"""Return the underlying ``ConfigParser`` object.
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Direct access to the .ini file is available here,
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though the :meth:`.Config.get_section` and
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:meth:`.Config.get_main_option`
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methods provide a possibly simpler interface.
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"""
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if self.config_file_name:
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here = os.path.abspath(os.path.dirname(self.config_file_name))
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else:
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here = ""
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self.config_args["here"] = here
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file_config = ConfigParser(self.config_args)
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if self.config_file_name:
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file_config.read([self.config_file_name])
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else:
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file_config.add_section(self.config_ini_section)
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return file_config
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def get_template_directory(self) -> str:
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"""Return the directory where Alembic setup templates are found.
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This method is used by the alembic ``init`` and ``list_templates``
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commands.
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"""
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import alembic
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package_dir = os.path.abspath(os.path.dirname(alembic.__file__))
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return os.path.join(package_dir, "templates")
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@overload
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def get_section(
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self, name: str, default: Dict[str, str]
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) -> Dict[str, str]:
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...
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@overload
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def get_section(
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self, name: str, default: Optional[Dict[str, str]] = ...
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) -> Optional[Dict[str, str]]:
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...
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def get_section(self, name: str, default=None):
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"""Return all the configuration options from a given .ini file section
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as a dictionary.
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"""
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if not self.file_config.has_section(name):
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return default
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return dict(self.file_config.items(name))
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def set_main_option(self, name: str, value: str) -> None:
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"""Set an option programmatically within the 'main' section.
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This overrides whatever was in the .ini file.
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:param name: name of the value
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:param value: the value. Note that this value is passed to
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``ConfigParser.set``, which supports variable interpolation using
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pyformat (e.g. ``%(some_value)s``). A raw percent sign not part of
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an interpolation symbol must therefore be escaped, e.g. ``%%``.
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The given value may refer to another value already in the file
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using the interpolation format.
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"""
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self.set_section_option(self.config_ini_section, name, value)
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def remove_main_option(self, name: str) -> None:
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self.file_config.remove_option(self.config_ini_section, name)
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def set_section_option(self, section: str, name: str, value: str) -> None:
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"""Set an option programmatically within the given section.
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The section is created if it doesn't exist already.
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The value here will override whatever was in the .ini
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file.
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:param section: name of the section
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:param name: name of the value
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:param value: the value. Note that this value is passed to
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``ConfigParser.set``, which supports variable interpolation using
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pyformat (e.g. ``%(some_value)s``). A raw percent sign not part of
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an interpolation symbol must therefore be escaped, e.g. ``%%``.
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The given value may refer to another value already in the file
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using the interpolation format.
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"""
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if not self.file_config.has_section(section):
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self.file_config.add_section(section)
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self.file_config.set(section, name, value)
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def get_section_option(
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self, section: str, name: str, default: Optional[str] = None
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) -> Optional[str]:
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"""Return an option from the given section of the .ini file."""
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if not self.file_config.has_section(section):
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raise util.CommandError(
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"No config file %r found, or file has no "
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"'[%s]' section" % (self.config_file_name, section)
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)
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if self.file_config.has_option(section, name):
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return self.file_config.get(section, name)
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else:
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return default
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@overload
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def get_main_option(self, name: str, default: str) -> str:
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...
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@overload
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def get_main_option(
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self, name: str, default: Optional[str] = None
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) -> Optional[str]:
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...
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def get_main_option(self, name, default=None):
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"""Return an option from the 'main' section of the .ini file.
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This defaults to being a key from the ``[alembic]``
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section, unless the ``-n/--name`` flag were used to
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indicate a different section.
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"""
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return self.get_section_option(self.config_ini_section, name, default)
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class CommandLine:
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def __init__(self, prog: Optional[str] = None) -> None:
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self._generate_args(prog)
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def _generate_args(self, prog: Optional[str]) -> None:
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def add_options(fn, parser, positional, kwargs):
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kwargs_opts = {
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"template": (
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"-t",
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"--template",
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dict(
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default="generic",
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type=str,
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help="Setup template for use with 'init'",
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),
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),
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"message": (
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"-m",
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"--message",
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dict(
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type=str, help="Message string to use with 'revision'"
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),
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),
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"sql": (
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"--sql",
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dict(
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action="store_true",
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help="Don't emit SQL to database - dump to "
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"standard output/file instead. See docs on "
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"offline mode.",
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),
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),
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"tag": (
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"--tag",
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dict(
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type=str,
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help="Arbitrary 'tag' name - can be used by "
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"custom env.py scripts.",
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),
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),
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"head": (
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"--head",
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dict(
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type=str,
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help="Specify head revision or <branchname>@head "
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"to base new revision on.",
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),
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),
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"splice": (
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"--splice",
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dict(
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action="store_true",
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help="Allow a non-head revision as the "
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"'head' to splice onto",
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),
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),
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"depends_on": (
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"--depends-on",
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dict(
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action="append",
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help="Specify one or more revision identifiers "
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"which this revision should depend on.",
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),
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),
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"rev_id": (
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"--rev-id",
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dict(
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type=str,
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help="Specify a hardcoded revision id instead of "
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"generating one",
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),
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),
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"version_path": (
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"--version-path",
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dict(
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type=str,
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help="Specify specific path from config for "
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"version file",
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),
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),
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|
|
"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.",
|
||
|
|
),
|
||
|
|
),
|
||
|
|
"rev_range": (
|
||
|
|
"-r",
|
||
|
|
"--rev-range",
|
||
|
|
dict(
|
||
|
|
action="store",
|
||
|
|
help="Specify a revision range; "
|
||
|
|
"format is [start]:[end]",
|
||
|
|
),
|
||
|
|
),
|
||
|
|
"indicate_current": (
|
||
|
|
"-i",
|
||
|
|
"--indicate-current",
|
||
|
|
dict(
|
||
|
|
action="store_true",
|
||
|
|
help="Indicate the current revision",
|
||
|
|
),
|
||
|
|
),
|
||
|
|
"purge": (
|
||
|
|
"--purge",
|
||
|
|
dict(
|
||
|
|
action="store_true",
|
||
|
|
help="Unconditionally erase the version table "
|
||
|
|
"before stamping",
|
||
|
|
),
|
||
|
|
),
|
||
|
|
"package": (
|
||
|
|
"--package",
|
||
|
|
dict(
|
||
|
|
action="store_true",
|
||
|
|
help="Write empty __init__.py files to the "
|
||
|
|
"environment and version locations",
|
||
|
|
),
|
||
|
|
),
|
||
|
|
}
|
||
|
|
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"
|
||
|
|
or fn in positional_translations
|
||
|
|
and positional_translations[fn][arg] == "revisions"
|
||
|
|
):
|
||
|
|
subparser.add_argument(
|
||
|
|
"revisions",
|
||
|
|
nargs="+",
|
||
|
|
help=positional_help.get("revisions"),
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
subparser.add_argument(arg, help=positional_help.get(arg))
|
||
|
|
|
||
|
|
parser = ArgumentParser(prog=prog)
|
||
|
|
|
||
|
|
parser.add_argument(
|
||
|
|
"--version", action="version", version="%%(prog)s %s" % __version__
|
||
|
|
)
|
||
|
|
parser.add_argument(
|
||
|
|
"-c",
|
||
|
|
"--config",
|
||
|
|
type=str,
|
||
|
|
default=os.environ.get("ALEMBIC_CONFIG", "alembic.ini"),
|
||
|
|
help="Alternate config file; defaults to value of "
|
||
|
|
'ALEMBIC_CONFIG environment variable, or "alembic.ini"',
|
||
|
|
)
|
||
|
|
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()
|
||
|
|
|
||
|
|
positional_translations = {command.stamp: {"revision": "revisions"}}
|
||
|
|
|
||
|
|
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 = compat.inspect_getfullargspec(fn)
|
||
|
|
if spec[3] is not None:
|
||
|
|
positional = spec[0][1 : -len(spec[3])]
|
||
|
|
kwarg = spec[0][-len(spec[3]) :]
|
||
|
|
else:
|
||
|
|
positional = spec[0][1:]
|
||
|
|
kwarg = []
|
||
|
|
|
||
|
|
if fn in positional_translations:
|
||
|
|
positional = [
|
||
|
|
positional_translations[fn].get(name, name)
|
||
|
|
for name in positional
|
||
|
|
]
|
||
|
|
|
||
|
|
# parse first line(s) of helptext without a line break
|
||
|
|
help_ = fn.__doc__
|
||
|
|
if help_:
|
||
|
|
help_text = []
|
||
|
|
for line in help_.split("\n"):
|
||
|
|
if not line.strip():
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
help_text.append(line.strip())
|
||
|
|
else:
|
||
|
|
help_text = []
|
||
|
|
subparser = subparsers.add_parser(
|
||
|
|
fn.__name__, help=" ".join(help_text)
|
||
|
|
)
|
||
|
|
add_options(fn, subparser, positional, kwarg)
|
||
|
|
subparser.set_defaults(cmd=(fn, positional, kwarg))
|
||
|
|
self.parser = parser
|
||
|
|
|
||
|
|
def run_cmd(self, config: Config, options: Namespace) -> None:
|
||
|
|
fn, positional, kwarg = options.cmd
|
||
|
|
|
||
|
|
try:
|
||
|
|
fn(
|
||
|
|
config,
|
||
|
|
*[getattr(options, k, None) for k in positional],
|
||
|
|
**{k: getattr(options, k, None) 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()
|