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alembic
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command.py
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# mypy: allow-untyped-defs, allow-untyped-calls from __future__ import annotations import os from typing import List from typing import Optional from typing import TYPE_CHECKING from typing import Union from . import autogenerate as autogen from . import util from .runtime.environment import EnvironmentContext from .script import ScriptDirectory if TYPE_CHECKING: from alembic.config import Config from alembic.script.base import Script from alembic.script.revision import _RevIdType from .runtime.environment import ProcessRevisionDirectiveFn def list_templates(config: Config) -> None: """List available templates. :param config: a :class:`.Config` object. """ config.print_stdout("Available templates:\n") for tempname in os.listdir(config.get_template_directory()): with open( os.path.join(config.get_template_directory(), tempname, "README") ) as readme: synopsis = next(readme).rstrip() config.print_stdout("%s - %s", tempname, synopsis) config.print_stdout("\nTemplates are used via the 'init' command, e.g.:") config.print_stdout("\n alembic init --template generic ./scripts") def init( config: Config, directory: str, template: str = "generic", package: bool = False, ) -> None: """Initialize a new scripts directory. :param config: a :class:`.Config` object. :param directory: string path of the target directory. :param template: string name of the migration environment template to use. :param package: when True, write ``__init__.py`` files into the environment location as well as the versions/ location. """ if os.access(directory, os.F_OK) and os.listdir(directory): raise util.CommandError( "Directory %s already exists and is not empty" % directory ) template_dir = os.path.join(config.get_template_directory(), template) if not os.access(template_dir, os.F_OK): raise util.CommandError("No such template %r" % template) if not os.access(directory, os.F_OK): with util.status( f"Creating directory {os.path.abspath(directory)!r}", **config.messaging_opts, ): os.makedirs(directory) versions = os.path.join(directory, "versions") with util.status( f"Creating directory {os.path.abspath(versions)!r}", **config.messaging_opts, ): os.makedirs(versions) script = ScriptDirectory(directory) config_file: str | None = None for file_ in os.listdir(template_dir): file_path = os.path.join(template_dir, file_) if file_ == "alembic.ini.mako": assert config.config_file_name is not None config_file = os.path.abspath(config.config_file_name) if os.access(config_file, os.F_OK): util.msg( f"File {config_file!r} already exists, skipping", **config.messaging_opts, ) else: script._generate_template( file_path, config_file, script_location=directory ) elif os.path.isfile(file_path): output_file = os.path.join(directory, file_) script._copy_file(file_path, output_file) if package: for path in [ os.path.join(os.path.abspath(directory), "__init__.py"), os.path.join(os.path.abspath(versions), "__init__.py"), ]: with util.status(f"Adding {path!r}", **config.messaging_opts): with open(path, "w"): pass assert config_file is not None util.msg( "Please edit configuration/connection/logging " f"settings in {config_file!r} before proceeding.", **config.messaging_opts, ) def revision( config: Config, message: Optional[str] = None, autogenerate: bool = False, sql: bool = False, head: str = "head", splice: bool = False, branch_label: Optional[_RevIdType] = None, version_path: Optional[str] = None, rev_id: Optional[str] = None, depends_on: Optional[str] = None, process_revision_directives: Optional[ProcessRevisionDirectiveFn] = None, ) -> Union[Optional[Script], List[Optional[Script]]]: """Create a new revision file. :param config: a :class:`.Config` object. :param message: string message to apply to the revision; this is the ``-m`` option to ``alembic revision``. :param autogenerate: whether or not to autogenerate the script from the database; this is the ``--autogenerate`` option to ``alembic revision``. :param sql: whether to dump the script out as a SQL string; when specified, the script is dumped to stdout. This is the ``--sql`` option to ``alembic revision``. :param head: head revision to build the new revision upon as a parent; this is the ``--head`` option to ``alembic revision``. :param splice: whether or not the new revision should be made into a new head of its own; is required when the given ``head`` is not itself a head. This is the ``--splice`` option to ``alembic revision``. :param branch_label: string label to apply to the branch; this is the ``--branch-label`` option to ``alembic revision``. :param version_path: string symbol identifying a specific version path from the configuration; this is the ``--version-path`` option to ``alembic revision``. :param rev_id: optional revision identifier to use instead of having one generated; this is the ``--rev-id`` option to ``alembic revision``. :param depends_on: optional list of "depends on" identifiers; this is the ``--depends-on`` option to ``alembic revision``. :param process_revision_directives: this is a callable that takes the same form as the callable described at :paramref:`.EnvironmentContext.configure.process_revision_directives`; will be applied to the structure generated by the revision process where it can be altered programmatically. Note that unlike all the other parameters, this option is only available via programmatic use of :func:`.command.revision`. """ script_directory = ScriptDirectory.from_config(config) command_args = dict( message=message, autogenerate=autogenerate, sql=sql, head=head, splice=splice, branch_label=branch_label, version_path=version_path, rev_id=rev_id, depends_on=depends_on, ) revision_context = autogen.RevisionContext( config, script_directory, command_args, process_revision_directives=process_revision_directives, ) environment = util.asbool(config.get_main_option("revision_environment")) if autogenerate: environment = True if sql: raise util.CommandError( "Using --sql with --autogenerate does not make any sense" ) def retrieve_migrations(rev, context): revision_context.run_autogenerate(rev, context) return [] elif environment: def retrieve_migrations(rev, context): revision_context.run_no_autogenerate(rev, context) return [] elif sql: raise util.CommandError( "Using --sql with the revision command when " "revision_environment is not configured does not make any sense" ) if environment: with EnvironmentContext( config, script_directory, fn=retrieve_migrations, as_sql=sql, template_args=revision_context.template_args, revision_context=revision_context, ): script_directory.run_env() # the revision_context now has MigrationScript structure(s) present. # these could theoretically be further processed / rewritten *here*, # in addition to the hooks present within each run_migrations() call, # or at the end of env.py run_migrations_online(). scripts = [script for script in revision_context.generate_scripts()] if len(scripts) == 1: return scripts[0] else: return scripts def check(config: "Config") -> None: """Check if revision command with autogenerate has pending upgrade ops. :param config: a :class:`.Config` object. .. versionadded:: 1.9.0 """ script_directory = ScriptDirectory.from_config(config) command_args = dict( message=None, autogenerate=True, sql=False, head="head", splice=False, branch_label=None, version_path=None, rev_id=None, depends_on=None, ) revision_context = autogen.RevisionContext( config, script_directory, command_args, ) def retrieve_migrations(rev, context): revision_context.run_autogenerate(rev, context) return [] with EnvironmentContext( config, script_directory, fn=retrieve_migrations, as_sql=False, template_args=revision_context.template_args, revision_context=revision_context, ): script_directory.run_env() # the revision_context now has MigrationScript structure(s) present. migration_script = revision_context.generated_revisions[-1] diffs = [] for upgrade_ops in migration_script.upgrade_ops_list: diffs.extend(upgrade_ops.as_diffs()) if diffs: raise util.AutogenerateDiffsDetected( f"New upgrade operations detected: {diffs}" ) else: config.print_stdout("No new upgrade operations detected.") def merge( config: Config, revisions: _RevIdType, message: Optional[str] = None, branch_label: Optional[_RevIdType] = None, rev_id: Optional[str] = None, ) -> Optional[Script]: """Merge two revisions together. Creates a new migration file. :param config: a :class:`.Config` instance :param revisions: The revisions to merge. :param message: string message to apply to the revision. :param branch_label: string label name to apply to the new revision. :param rev_id: hardcoded revision identifier instead of generating a new one. .. seealso:: :ref:`branches` """ script = ScriptDirectory.from_config(config) template_args = { "config": config # Let templates use config for # e.g. multiple databases } environment = util.asbool(config.get_main_option("revision_environment")) if environment: def nothing(rev, context): return [] with EnvironmentContext( config, script, fn=nothing, as_sql=False, template_args=template_args, ): script.run_env() return script.generate_revision( rev_id or util.rev_id(), message, refresh=True, head=revisions, branch_labels=branch_label, **template_args, # type:ignore[arg-type] ) def upgrade( config: Config, revision: str, sql: bool = False, tag: Optional[str] = None, ) -> None: """Upgrade to a later version. :param config: a :class:`.Config` instance. :param revision: string revision target or range for --sql mode. May be ``"heads"`` to target the most recent revision(s). :param sql: if True, use ``--sql`` mode. :param tag: an arbitrary "tag" that can be intercepted by custom ``env.py`` scripts via the :meth:`.EnvironmentContext.get_tag_argument` method. """ script = ScriptDirectory.from_config(config) starting_rev = None if ":" in revision: if not sql: raise util.CommandError("Range revision not allowed") starting_rev, revision = revision.split(":", 2) def upgrade(rev, context): return script._upgrade_revs(revision, rev) with EnvironmentContext( config, script, fn=upgrade, as_sql=sql, starting_rev=starting_rev, destination_rev=revision, tag=tag, ): script.run_env() def downgrade( config: Config, revision: str, sql: bool = False, tag: Optional[str] = None, ) -> None: """Revert to a previous version. :param config: a :class:`.Config` instance. :param revision: string revision target or range for --sql mode. May be ``"base"`` to target the first revision. :param sql: if True, use ``--sql`` mode. :param tag: an arbitrary "tag" that can be intercepted by custom ``env.py`` scripts via the :meth:`.EnvironmentContext.get_tag_argument` method. """ script = ScriptDirectory.from_config(config) starting_rev = None if ":" in revision: if not sql: raise util.CommandError("Range revision not allowed") starting_rev, revision = revision.split(":", 2) elif sql: raise util.CommandError( "downgrade with --sql requires <fromrev>:<torev>" ) def downgrade(rev, context): return script._downgrade_revs(revision, rev) with EnvironmentContext( config, script, fn=downgrade, as_sql=sql, starting_rev=starting_rev, destination_rev=revision, tag=tag, ): script.run_env() def show(config: Config, rev: str) -> None: """Show the revision(s) denoted by the given symbol. :param config: a :class:`.Config` instance. :param rev: string revision target. May be ``"current"`` to show the revision(s) currently applied in the database. """ script = ScriptDirectory.from_config(config) if rev == "current": def show_current(rev, context): for sc in script.get_revisions(rev): config.print_stdout(sc.log_entry) return [] with EnvironmentContext(config, script, fn=show_current): script.run_env() else: for sc in script.get_revisions(rev): config.print_stdout(sc.log_entry) def history( config: Config, rev_range: Optional[str] = None, verbose: bool = False, indicate_current: bool = False, ) -> None: """List changeset scripts in chronological order. :param config: a :class:`.Config` instance. :param rev_range: string revision range. :param verbose: output in verbose mode. :param indicate_current: indicate current revision. """ base: Optional[str] head: Optional[str] script = ScriptDirectory.from_config(config) if rev_range is not None: if ":" not in rev_range: raise util.CommandError( "History range requires [start]:[end], " "[start]:, or :[end]" ) base, head = rev_range.strip().split(":") else: base = head = None environment = ( util.asbool(config.get_main_option("revision_environment")) or indicate_current ) def _display_history(config, script, base, head, currents=()): for sc in script.walk_revisions( base=base or "base", head=head or "heads" ): if indicate_current: sc._db_current_indicator = sc.revision in currents config.print_stdout( sc.cmd_format( verbose=verbose, include_branches=True, include_doc=True, include_parents=True, ) ) def _display_history_w_current(config, script, base, head): def _display_current_history(rev, context): if head == "current": _display_history(config, script, base, rev, rev) elif base == "current": _display_history(config, script, rev, head, rev) else: _display_history(config, script, base, head, rev) return [] with EnvironmentContext(config, script, fn=_display_current_history): script.run_env() if base == "current" or head == "current" or environment: _display_history_w_current(config, script, base, head) else: _display_history(config, script, base, head) def heads( config: Config, verbose: bool = False, resolve_dependencies: bool = False ) -> None: """Show current available heads in the script directory. :param config: a :class:`.Config` instance. :param verbose: output in verbose mode. :param resolve_dependencies: treat dependency version as down revisions. """ script = ScriptDirectory.from_config(config) if resolve_dependencies: heads = script.get_revisions("heads") else: heads = script.get_revisions(script.get_heads()) for rev in heads: config.print_stdout( rev.cmd_format( verbose, include_branches=True, tree_indicators=False ) ) def branches(config: Config, verbose: bool = False) -> None: """Show current branch points. :param config: a :class:`.Config` instance. :param verbose: output in verbose mode. """ script = ScriptDirectory.from_config(config) for sc in script.walk_revisions(): if sc.is_branch_point: config.print_stdout( "%s\n%s\n", sc.cmd_format(verbose, include_branches=True), "\n".join( "%s -> %s" % ( " " * len(str(sc.revision)), rev_obj.cmd_format( False, include_branches=True, include_doc=verbose ), ) for rev_obj in ( script.get_revision(rev) for rev in sc.nextrev ) ), ) def current(config: Config, verbose: bool = False) -> None: """Display the current revision for a database. :param config: a :class:`.Config` instance. :param verbose: output in verbose mode. """ script = ScriptDirectory.from_config(config) def display_version(rev, context): if verbose: config.print_stdout( "Current revision(s) for %s:", util.obfuscate_url_pw(context.connection.engine.url), ) for rev in script.get_all_current(rev): config.print_stdout(rev.cmd_format(verbose)) return [] with EnvironmentContext( config, script, fn=display_version, dont_mutate=True ): script.run_env() def stamp( config: Config, revision: _RevIdType, sql: bool = False, tag: Optional[str] = None, purge: bool = False, ) -> None: """'stamp' the revision table with the given revision; don't run any migrations. :param config: a :class:`.Config` instance. :param revision: target revision or list of revisions. May be a list to indicate stamping of multiple branch heads; may be ``"base"`` to remove all revisions from the table or ``"heads"`` to stamp the most recent revision(s). .. note:: this parameter is called "revisions" in the command line interface. :param sql: use ``--sql`` mode :param tag: an arbitrary "tag" that can be intercepted by custom ``env.py`` scripts via the :class:`.EnvironmentContext.get_tag_argument` method. :param purge: delete all entries in the version table before stamping. """ script = ScriptDirectory.from_config(config) if sql: destination_revs = [] starting_rev = None for _revision in util.to_list(revision): if ":" in _revision: srev, _revision = _revision.split(":", 2) if starting_rev != srev: if starting_rev is None: starting_rev = srev else: raise util.CommandError( "Stamp operation with --sql only supports a " "single starting revision at a time" ) destination_revs.append(_revision) else: destination_revs = util.to_list(revision) def do_stamp(rev, context): return script._stamp_revs(util.to_tuple(destination_revs), rev) with EnvironmentContext( config, script, fn=do_stamp, as_sql=sql, starting_rev=starting_rev if sql else None, destination_rev=util.to_tuple(destination_revs), tag=tag, purge=purge, ): script.run_env() def edit(config: Config, rev: str) -> None: """Edit revision script(s) using $EDITOR. :param config: a :class:`.Config` instance. :param rev: target revision. """ script = ScriptDirectory.from_config(config) if rev == "current": def edit_current(rev, context): if not rev: raise util.CommandError("No current revisions") for sc in script.get_revisions(rev): util.open_in_editor(sc.path) return [] with EnvironmentContext(config, script, fn=edit_current): script.run_env() else: revs = script.get_revisions(rev) if not revs: raise util.CommandError( "No revision files indicated by symbol '%s'" % rev ) for sc in revs: assert sc util.open_in_editor(sc.path) def ensure_version(config: Config, sql: bool = False) -> None: """Create the alembic version table if it doesn't exist already . :param config: a :class:`.Config` instance. :param sql: use ``--sql`` mode. .. versionadded:: 1.7.6 """ script = ScriptDirectory.from_config(config) def do_ensure_version(rev, context): context._ensure_version_table() return [] with EnvironmentContext( config, script, fn=do_ensure_version, as_sql=sql, ): script.run_env()