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Direktori : /opt/alt/python37/lib/python3.7/site-packages/alembic/ |
Current File : //opt/alt/python37/lib/python3.7/site-packages/alembic/command.py |
import os from .script import ScriptDirectory from .runtime.environment import EnvironmentContext from . import util from . import autogenerate as autogen def list_templates(config): """List available templates""" 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) 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, directory, template='generic'): """Initialize a new scripts directory.""" if os.access(directory, os.F_OK): raise util.CommandError("Directory %s already exists" % 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) util.status("Creating directory %s" % os.path.abspath(directory), os.makedirs, directory) versions = os.path.join(directory, 'versions') util.status("Creating directory %s" % os.path.abspath(versions), os.makedirs, versions) script = ScriptDirectory(directory) for file_ in os.listdir(template_dir): file_path = os.path.join(template_dir, file_) if file_ == 'alembic.ini.mako': config_file = os.path.abspath(config.config_file_name) if os.access(config_file, os.F_OK): util.msg("File %s already exists, skipping" % config_file) 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 ) util.msg("Please edit configuration/connection/logging " "settings in %r before proceeding." % config_file) def revision( config, message=None, autogenerate=False, sql=False, head="head", splice=False, branch_label=None, version_path=None, rev_id=None, depends_on=None): """Create a new revision file.""" 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) 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() scripts = [ script for script in revision_context.generate_scripts() ] if len(scripts) == 1: return scripts[0] else: return scripts def merge(config, revisions, message=None, branch_label=None, rev_id=None): """Merge two revisions together. Creates a new migration file. .. versionadded:: 0.7.0 .. seealso:: :ref:`branches` """ script = ScriptDirectory.from_config(config) template_args = { 'config': config # Let templates use config for # e.g. multiple databases } return script.generate_revision( rev_id or util.rev_id(), message, refresh=True, head=revisions, branch_labels=branch_label, **template_args) def upgrade(config, revision, sql=False, tag=None): """Upgrade to a later version.""" 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, revision, sql=False, tag=None): """Revert to a previous version.""" 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, rev): """Show the revision(s) denoted by the given symbol.""" 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, rev_range=None, verbose=False): """List changeset scripts in chronological order.""" 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 def _display_history(config, script, base, head): for sc in script.walk_revisions( base=base or "base", head=head or "heads"): 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=None, head=None): def _display_current_history(rev, context): if head is None: _display_history(config, script, base, rev) elif base is None: _display_history(config, script, rev, head) return [] with EnvironmentContext( config, script, fn=_display_current_history ): script.run_env() if base == "current": _display_history_w_current(config, script, head=head) elif head == "current": _display_history_w_current(config, script, base=base) else: _display_history(config, script, base, head) def heads(config, verbose=False, resolve_dependencies=False): """Show current available heads in the script directory""" 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, verbose=False): """Show current branch points""" 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, verbose=False, head_only=False): """Display the current revision for a database.""" script = ScriptDirectory.from_config(config) if head_only: util.warn("--head-only is deprecated") 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_revisions(rev): config.print_stdout(rev.cmd_format(verbose)) return [] with EnvironmentContext( config, script, fn=display_version ): script.run_env() def stamp(config, revision, sql=False, tag=None): """'stamp' the revision table with the given revision; don't run any migrations.""" 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 do_stamp(rev, context): return script._stamp_revs(revision, rev) with EnvironmentContext( config, script, fn=do_stamp, as_sql=sql, destination_rev=revision, starting_rev=starting_rev, tag=tag ): script.run_env() def edit(config, rev): """Edit revision script(s) using $EDITOR""" 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.edit(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: util.edit(sc.path)