Update README with note on how to validate output.

With somewhat-recent docker features and spec changes that have been included in the compose file generation for this script, specifying compose file version 3.6 (at least) is necessary for the output compose file to pass validation using "docker-compose config".

README.md

@@ -43,3 +43,10 @@ Use the new image to generate a docker-compose file from a running container or
 
     docker run --rm -v /var/run/docker.sock:/var/run/docker.sock ghcr.io/red5d/docker-autocompose <container-name-or-id> <additional-names-or-ids>...
 
+To print out all containers in a docker-compose format:
+
+    docker run --rm -v /var/run/docker.sock:/var/run/docker.sock ghcr.io/red5d/docker-autocompose $(docker ps -aq)
+    
+## Contributing
+
+When making changes, please validate the output from the script by writing it to a file (docker-compose.yml or docker-compose.yaml) and running "docker-compose config" in the same folder with it to ensure that the resulting compose file will be accepted by docker-compose.

autocompose.py

@@ -1,38 +1,84 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
-
+import datetime
 import sys, argparse, pyaml, docker
 from collections import OrderedDict
 
+
+def list_container_names():
+    c = docker.from_env()
+    return [container.name for container in c.containers.list(all=True)]
+
+
 def main():
     parser = argparse.ArgumentParser(description='Generate docker-compose yaml definition from running container.')
+    parser.add_argument('-a', '--all', action='store_true', help='Include all active containers')
     parser.add_argument('-v', '--version', type=int, default=3, help='Compose file version (1 or 3)')
     parser.add_argument('cnames', nargs='*', type=str, help='The name of the container to process.')
+    parser.add_argument('-c', '--createvolumes', action='store_true', help='Create new volumes instead of reusing existing ones')
     args = parser.parse_args()
 
+    container_names = args.cnames
+    if args.all:
+        container_names.extend(list_container_names())
+
     struct = {}
-    networks = []
+    networks = {}
-    for cname in args.cnames:
+    volumes = {}
-        cfile, networks = generate(cname)
+    containers = {}
+    for cname in container_names:
+        cfile, c_networks, c_volumes = generate(cname, createvolumes=args.createvolumes)
+
         struct.update(cfile)
 
-    render(struct, args, networks)
+        if not c_networks == None:
+            networks.update(c_networks)
+        if not c_volumes == None:
+            volumes.update(c_volumes)
     
+    # moving the networks = None statemens outside of the for loop. Otherwise any container could reset it.
+    if len(networks) == 0:
+    	networks = None
+    if len(volumes) == 0:
+    	volumes = None
+    render(struct, args, networks, volumes)
 
-def render(struct, args, networks):
+def render(struct, args, networks, volumes):
     # Render yaml file
     if args.version == 1:
         pyaml.p(OrderedDict(struct))
     else:
-        pyaml.p(OrderedDict({'version': '"3"', 'services': struct, 'networks': networks}))
+        ans = {'version': '"3.6"', 'services': struct}
+
+        if networks is not None:
+            ans['networks'] = networks
+
+        if volumes is not None:
+            ans['volumes'] = volumes
+
+        pyaml.p(OrderedDict(ans))
 
 
-def generate(cname):
+def is_date_or_time(s: str):
+    for parse_func in [datetime.date.fromisoformat, datetime.datetime.fromisoformat]:
+        try:
+            parse_func(s.rstrip('Z'))
+            return True
+        except ValueError:
+            pass
+    return False
+
+
+def fix_label(label: str):
+    return f"'{label}'" if is_date_or_time(label) else label
+
+
+def generate(cname, createvolumes=False):
     c = docker.from_env()
 
     try:
         cid = [x.short_id for x in c.containers.list(all=True) if cname == x.name or x.short_id in cname][0]
     except IndexError:
-        print("That container is not available.")
+        print("That container is not available.", file=sys.stderr)
         sys.exit(1)
 
     cattrs = c.containers.get(cid).attrs
@@ -44,6 +90,8 @@ def generate(cname):
     cfile[cattrs['Name'][1:]] = {}
     ct = cfile[cattrs['Name'][1:]]
 
+    default_networks = ['bridge', 'host', 'none']
+
     values = {
         'cap_add': cattrs['HostConfig']['CapAdd'],
         'cap_drop': cattrs['HostConfig']['CapDrop'],
@@ -55,15 +103,17 @@ def generate(cname):
         'environment': cattrs['Config']['Env'],
         'extra_hosts': cattrs['HostConfig']['ExtraHosts'],
         'image': cattrs['Config']['Image'],
-        'labels': cattrs['Config']['Labels'],
+        'labels': {label: fix_label(value) for label, value in cattrs['Config']['Labels'].items()},
         'links': cattrs['HostConfig']['Links'],
         #'log_driver': cattrs['HostConfig']['LogConfig']['Type'],
         #'log_opt': cattrs['HostConfig']['LogConfig']['Config'],
         'logging': {'driver': cattrs['HostConfig']['LogConfig']['Type'], 'options': cattrs['HostConfig']['LogConfig']['Config']},
-        'networks': {x for x in cattrs['NetworkSettings']['Networks'].keys() if x != 'bridge'},
+        'networks': {x for x in cattrs['NetworkSettings']['Networks'].keys() if x not in default_networks},
         'security_opt': cattrs['HostConfig']['SecurityOpt'],
         'ulimits': cattrs['HostConfig']['Ulimits'],
-        'volumes': cattrs['HostConfig']['Binds'],
+# the line below would not handle type bind
+#        'volumes': [f'{m["Name"]}:{m["Destination"]}' for m in cattrs['Mounts'] if m['Type'] == 'volume'],
+        'mounts': cattrs['Mounts'], #this could be moved outside of the dict. will only use it for generate
         'volume_driver': cattrs['HostConfig']['VolumeDriver'],
         'volumes_from': cattrs['HostConfig']['VolumesFrom'],
         'entrypoint': cattrs['Config']['Entrypoint'],
@@ -87,15 +137,47 @@ def generate(cname):
     networks = {}
     if values['networks'] == set():
         del values['networks']
+        assumed_default_network = list(cattrs['NetworkSettings']['Networks'].keys())[0]
+        values['network_mode'] = assumed_default_network
+        networks = None
     else:
         networklist = c.networks.list()
         for network in networklist:
             if network.attrs['Name'] in values['networks']:
-                networks[network.attrs['Name']] = {'external': (not network.attrs['Internal'])}
+                networks[network.attrs['Name']] = {'external': (not network.attrs['Internal']),
+                                                   'name': network.attrs['Name']}
+#     volumes = {}
+#     if values['volumes'] is not None:
+#         for volume in values['volumes']:
+#             volume_name = volume.split(':')[0]
+#             volumes[volume_name] = {'external': True}
+#     else:
+#         volumes = None
+        
+    # handles both the returned values['volumes'] (in c_file) and volumes for both, the bind and volume types
+    # also includes the read only option
+    volumes = {}
+    mountpoints = []
+    if values['mounts'] is not None:
+        for mount in values['mounts']:
+            destination = mount['Destination']
+            if not mount['RW']:
+                destination = destination + ':ro'
+            if mount['Type'] == 'volume':
+                mountpoints.append(mount['Name'] + ':' + destination)
+                if not createvolumes:
+                    volumes[mount['Name']] = {'external': True}    #to reuse an existing volume ... better to make that a choice? (cli argument)
+            elif mount['Type'] == 'bind':
+                mountpoints.append(mount['Source'] + ':' + destination)
+        values['volumes'] = mountpoints
+    if len(volumes) == 0:
+        volumes = None
+    values['mounts'] = None #remove this temporary data from the returned data
+
 
     # Check for command and add it if present.
-    if cattrs['Config']['Cmd'] != None:
+    if cattrs['Config']['Cmd'] is not None:
-        values['command'] = " ".join(cattrs['Config']['Cmd']),
+        values['command'] = cattrs['Config']['Cmd']
 
     # Check for exposed/bound ports and add them if needed.
     try:
@@ -122,9 +204,8 @@ def generate(cname):
         if (value != None) and (value != "") and (value != []) and (value != 'null') and (value != {}) and (value != "default") and (value != 0) and (value != ",") and (value != "no"):
             ct[key] = value
 
-    return cfile, networks
+    return cfile, networks, volumes
 
 
 if __name__ == "__main__":
     main()
-