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#!/usr/bin/env python
"""
Migrate a Compose file from the V1 format in Compose 1.5 to the V2 format
supported by Compose 1.6+
"""
from __future__ import absolute_import
from __future__ import unicode_literals
import argparse
import logging
import sys
import ruamel.yaml
from compose.config.types import VolumeSpec
log = logging.getLogger('migrate')
def migrate(content):
data = ruamel.yaml.load(content, ruamel.yaml.RoundTripLoader)
service_names = data.keys()
for name, service in data.items():
warn_for_links(name, service)
warn_for_external_links(name, service)
rewrite_net(service, service_names)
rewrite_build(service)
rewrite_logging(service)
rewrite_volumes_from(service, service_names)
services = {name: data.pop(name) for name in data.keys()}
data['version'] = "2"
data['services'] = services
create_volumes_section(data)
return data
def warn_for_links(name, service):
links = service.get('links')
if links:
example_service = links[0].partition(':')[0]
log.warning(
"Service {name} has links, which no longer create environment "
"variables such as {example_service_upper}_PORT. "
"If you are using those in your application code, you should "
"instead connect directly to the hostname, e.g. "
"'{example_service}'."
.format(name=name, example_service=example_service,
example_service_upper=example_service.upper()))
def warn_for_external_links(name, service):
external_links = service.get('external_links')
if external_links:
log.warning(
"Service {name} has external_links: {ext}, which now work "
"slightly differently. In particular, two containers must be "
"connected to at least one network in common in order to "
"communicate, even if explicitly linked together.\n\n"
"Either connect the external container to your app's default "
"network, or connect both the external container and your "
"service's containers to a pre-existing network. See "
"https://docs.docker.com/compose/networking/ "
"for more on how to do this."
.format(name=name, ext=external_links))
def rewrite_net(service, service_names):
if 'net' in service:
network_mode = service.pop('net')
# "container:<service name>" is now "service:<service name>"
if network_mode.startswith('container:'):
name = network_mode.partition(':')[2]
if name in service_names:
network_mode = 'service:{}'.format(name)
service['network_mode'] = network_mode
def rewrite_build(service):
if 'dockerfile' in service:
service['build'] = {
'context': service.pop('build'),
'dockerfile': service.pop('dockerfile'),
}
def rewrite_logging(service):
if 'log_driver' in service:
service['logging'] = {'driver': service.pop('log_driver')}
if 'log_opt' in service:
service['logging']['options'] = service.pop('log_opt')
def rewrite_volumes_from(service, service_names):
for idx, volume_from in enumerate(service.get('volumes_from', [])):
if volume_from.split(':', 1)[0] not in service_names:
service['volumes_from'][idx] = 'container:%s' % volume_from
def create_volumes_section(data):
named_volumes = get_named_volumes(data['services'])
if named_volumes:
log.warning(
"Named volumes ({names}) must be explicitly declared. Creating a "
"'volumes' section with declarations.\n\n"
"For backwards-compatibility, they've been declared as external. "
"If you don't mind the volume names being prefixed with the "
"project name, you can remove the 'external' option from each one."
.format(names=', '.join(list(named_volumes))))
data['volumes'] = named_volumes
def get_named_volumes(services):
volume_specs = [
VolumeSpec.parse(volume)
for service in services.values()
for volume in service.get('volumes', [])
]
names = {
spec.external
for spec in volume_specs
if spec.is_named_volume
}
return {name: {'external': True} for name in names}
def write(stream, new_format, indent, width):
ruamel.yaml.dump(
new_format,
stream,
Dumper=ruamel.yaml.RoundTripDumper,
indent=indent,
width=width)
def parse_opts(args):
parser = argparse.ArgumentParser()
parser.add_argument("filename", help="Compose file filename.")
parser.add_argument("-i", "--in-place", action='store_true')
parser.add_argument(
"--indent", type=int, default=2,
help="Number of spaces used to indent the output yaml.")
parser.add_argument(
"--width", type=int, default=80,
help="Number of spaces used as the output width.")
return parser.parse_args()
def main(args):
logging.basicConfig(format='\033[33m%(levelname)s:\033[37m %(message)s\033[0m\n')
opts = parse_opts(args)
with open(opts.filename, 'r') as fh:
new_format = migrate(fh.read())
if opts.in_place:
output = open(opts.filename, 'w')
else:
output = sys.stdout
write(output, new_format, opts.indent, opts.width)
if __name__ == "__main__":
main(sys.argv)
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