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from alembic.script import ScriptDirectory
from alembic.environment import EnvironmentContext
from alembic import util, ddl, autogenerate as autogen
import os
def list_templates(config):
"""List available templates"""
config.print_stdout("Available templates:\n")
for tempname in os.listdir(config.get_template_directory()):
readme = os.path.join(
config.get_template_directory(),
tempname,
'README')
synopsis = open(readme).next()
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 pylons ./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):
"""Create a new revision file."""
script = ScriptDirectory.from_config(config)
template_args = {
'config': config # Let templates use config for
# e.g. multiple databases
}
imports = set()
environment = util.asbool(
config.get_main_option("revision_environment")
)
if autogenerate:
environment = True
util.requires_07("autogenerate")
def retrieve_migrations(rev, context):
if script.get_revision(rev) is not script.get_revision("head"):
raise util.CommandError("Target database is not up to date.")
autogen._produce_migration_diffs(context, template_args, imports)
return []
elif environment:
def retrieve_migrations(rev, context):
return []
if environment:
with EnvironmentContext(
config,
script,
fn=retrieve_migrations,
as_sql=sql,
template_args=template_args,
):
script.run_env()
script.generate_revision(util.rev_id(), message, **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 history(config):
"""List changeset scripts in chronological order."""
script = ScriptDirectory.from_config(config)
for sc in script.walk_revisions():
if sc.is_head:
config.print_stdout("")
config.print_stdout(sc)
def branches(config):
"""Show current un-spliced branch points"""
script = ScriptDirectory.from_config(config)
for sc in script.walk_revisions():
if sc.is_branch_point:
config.print_stdout(sc)
for rev in sc.nextrev:
config.print_stdout("%s -> %s",
" " * len(str(sc.down_revision)),
script.get_revision(rev)
)
def current(config):
"""Display the current revision for each database."""
script = ScriptDirectory.from_config(config)
def display_version(rev, context):
config.print_stdout("Current revision for %s: %s",
util.obfuscate_url_pw(
context.connection.engine.url),
script.get_revision(rev))
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)
def do_stamp(rev, context):
if sql:
current = False
else:
current = context._current_rev()
dest = script.get_revision(revision)
if dest is not None:
dest = dest.revision
context._update_current_rev(current, dest)
return []
with EnvironmentContext(
config,
script,
fn=do_stamp,
as_sql=sql,
destination_rev=revision,
tag=tag
):
script.run_env()
def splice(config, parent, child):
"""'splice' two branches, creating a new revision file.
this command isn't implemented right now.
"""
raise NotImplementedError()
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