def get_latest_tag(repo):
if not repo:
repo = _current_repo
url = 'https://{}/v1/repositories/{}/tags'.format(repo, my_image_name())
print "Querying latest tag at {}...".format(url)
r = requests.get(url)
if 200 <= r.status_code < 300:
print "Server {} returned: {}".format(repo, r.text)
ret = r.json()
for k, v in ret.iteritems():
if k != 'latest' and v == ret['latest']:
return '"{}"'.format(k)
return '"The latest tag does not correspond to a version."', 502
else:
return r.text, r.status_code
def post_images_pull(repo, tag):
if not exists(PULL_JSON):
pulling = False
else:
with open(PULL_JSON) as f:
pulling = json.load(f)['status'] == 'pulling'
if pulling:
return '"Pulling is already in progress."', 409
else:
print "Pulling from {} tag {} ... The following output is from pull.sh:".format(repo, tag)
# N.B. there is a small chance of race condition that this path is called again before
# pull.sh updates PULL_JSON. Maintenance cost of the full solution due to its complexity
# overweighs the benefit.
subprocess.Popen(['/pull.sh', repo, my_image_name(), tag, PULL_JSON])
return '"Pulling started successfully."'
def modify_yaml(repo, tag):
with open(CRANE_YML_PATH) as f:
y = yaml.load(f)
containers = y['containers']
my_image = my_image_name()
my_container = my_container_name()
loader_container = remove_loader_container(containers, my_image)
tagged_loader_container = add_tag_to_container(loader_container, tag)
add_repo_and_tag_to_images(containers, repo, tag)
modify_links(containers, tagged_loader_container, my_container, tag)
modify_volumes_from(containers, tagged_loader_container, my_container, tag)
if 'groups' in y:
modify_groups(y['groups'], tagged_loader_container, my_container, tag)
with open(MODIFIED_YML_PATH, 'w') as f:
f.write(yaml.dump(y, default_flow_style=False))
def modify_yaml(repo, tag, my_container=None, remove_loader_container=True):
if not my_container:
my_container = my_container_name()
my_image = my_image_name()
with open(CRANE_YML_PATH) as f:
y = yaml.load(f)
containers = y["containers"]
loader_container = get_loader_container(containers, my_image)
if remove_loader_container:
del containers[loader_container]
tagged_loader_container = add_tag_to_container(loader_container, tag)
add_repo_and_tag_to_images(containers, repo, tag)
modify_links(containers, tagged_loader_container, my_container, tag)
modify_volumes_from(containers, tagged_loader_container, my_container, tag)
if "groups" in y:
modify_groups(y["groups"], tagged_loader_container, my_container, tag)
with open(MODIFIED_YML_PATH, "w") as f:
f.write(yaml.dump(y, default_flow_style=False))
def modify_yaml(repo, tag, my_container=None, remove_loader_container=True):
if not my_container:
my_container = my_container_name()
my_image = my_image_name()
with open(CRANE_YML_PATH) as f:
y = yaml.load(f)
containers = y['containers']
loader_container = get_loader_container(containers, my_image)
if remove_loader_container:
del containers[loader_container]
tagged_loader_container = add_tag_to_container(loader_container, tag)
add_repo_and_tag_to_images(containers, repo, tag)
modify_links(containers, tagged_loader_container, my_container, tag)
modify_volumes_from(containers, tagged_loader_container, my_container, tag)
if 'groups' in y:
modify_groups(y['groups'], tagged_loader_container, my_container, tag)
with open(MODIFIED_YML_PATH, 'w') as f:
f.write(yaml.dump(y, default_flow_style=False))
def gc():
# TODO currently GC don't perform cleaning for loader images of the same tag but different repo names than the
# current loader.
subprocess.check_call(print_args(['/gc.sh', my_image_name(), _tag]))
return ''
def switch(repo, tag, target):
kill_other_containers()
print 'Computing data volumes to be copied from the old containers...'
# List old containers
# old: map of original-name => (old modified-name, image)
old = {}
with open(MODIFIED_YML_PATH) as f:
for k, v in yaml.load(f)['containers'].iteritems():
old[v['original-name']] = (k, v['image'])
# List the new containers that haven't been created and have shared volumes with their old counterparts.
# new: map of new modified-name => (old modified-name, volumes shared by both old and new containers)
new = {}
new_loader_image = '{}/{}:{}'.format(repo, my_image_name(), tag)
cmd = ['docker', 'run', '--rm', '-v', '/var/run/docker.sock:/var/run/docker.sock', new_loader_image, 'modified-yml',
repo, tag]
for new_container, new_container_props in yaml.load(subprocess.check_output(print_args(cmd)))['containers'].iteritems():
counterpart = old.get(new_container_props['original-name'])
if not counterpart:
print '{} has no counterpart'.format(new_container)
continue
volumes = volume_set_of(new_container_props['image'])
if not volumes:
print '{} has no data volumes'.format(new_container)
continue
counterpart_volumes = volume_set_of(counterpart[1])
if not counterpart_volumes:
print '{}\'s counterpart has no data volumes'.format(new_container)
continue
intersected_volumes = volumes & counterpart_volumes
if not counterpart_volumes:
print '{} has no intersecting data volumes'.format(new_container)
continue
if has_container(new_container):
print '{} already exists'.format(new_container)
continue
if not has_container(counterpart[0]):
print '{} doesn\'t exist'.format(counterpart[0])
continue
new[new_container] = (counterpart[0], intersected_volumes)
print 'Containers for data copying, in the format of "target-container: (source-container, volumes)":'
print new
# Create the loader container first. Otherwise when launching the containers that we create below, the system would
# fail if one of them links to the new loader -- the `create-containers` command doesn't create the loader.
new_loader = create_loader_container(new_loader_image, tag)
if new:
# Create containers
cmd = ['docker', 'run', '--rm', '-v', '/var/run/docker.sock:/var/run/docker.sock', new_loader_image,
'create-containers', repo, tag, new_loader]
cmd.extend(new.keys())
subprocess.check_call(print_args(cmd))
# Copy data
loader_image = my_full_image_name()
for container, new_container_props in new.iteritems():
cmd = ['/copy-container-data.sh', loader_image, new_container_props[0], container]
cmd.extend(list(new_container_props[1]))
subprocess.check_call(print_args(cmd))
with open(_repo_file, 'w') as f:
f.write(repo)
with open(_tag_file, 'w') as f:
f.write(tag)
return restart_to(target)
