Compose v3.9 name attribute fails validation ('name' does not match any of the regexes)

[quaos]

Description

Hi. I've been using Compose for a while. Recently I started adding name attribute to the files to specify container group/project name.
But recently, I get this error when building. (See: Describe the results you received section)

If I comment out the name attribute, compose can build with the file normally.

Ref. Issue: #745

I've searched in the issues and did not find any mention of this attribute being deprecated.

(For now I'd use COMPOSE_PROJECT_NAME env variable as a workaround.)

Steps to reproduce the issue:

1. Create new docker-compose.yaml with minimal services section.
2. Add name: 'my-project' to root of file.
3. Run docker-compose build or docker-compose -f docker-compose.yml config.

Describe the results you received:

with name attribute:

# docker-compose -f docker-compose.yml config

ERROR: The Compose file './docker-compose.yml' is invalid because:
'name' does not match any of the regexes: '^x-'

when commenting out name attribute:

# docker-compose -f docker-compose.yml config

networks:
#  ...
services:
#  ...
version: '3.9'
volumes:
#  ...

(I've commented out version attribute in my compose file)

Describe the results you expected:

It should build the images. And when using docker-compose up the container group should have specified name.

Additional information you deem important (e.g. issue happens only occasionally):

Output of docker compose version:

# docker compose version
Docker Compose version v2.3.3

# docker-compose version
docker-compose version 1.29.2, build 5becea4c
docker-py version: 5.0.0
CPython version: 3.9.0
OpenSSL version: OpenSSL 1.1.1h  22 Sep 2020

Output of docker info:

Client:
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc., v0.8.1)
  compose: Docker Compose (Docker Inc., v2.3.3)
  scan: Docker Scan (Docker Inc., v0.17.0)

Server:
 Containers: 9
  Running: 3
  Paused: 0
  Stopped: 6
 Images: 73
 Server Version: 20.10.13
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runtime.v1.linux runc io.containerd.runc.v2
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 2a1d4dbdb2a1030dc5b01e96fb110a9d9f150ecc
 runc version: v1.0.3-0-gf46b6ba
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
  cgroupns
 Kernel Version: 5.10.104-linuxkit
 Operating System: Docker Desktop
 OSType: linux
 Architecture: x86_64
 CPUs: 4
 Total Memory: 7.774GiB
 Name: docker-desktop
 ID: OOPR:JCU6:V56R:LGBB:WXH7:RIJC:YGJC:GSF3:KYFR:L5ZH:E3XX:ULSA
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 HTTP Proxy: http.docker.internal:3128
 HTTPS Proxy: http.docker.internal:3128
 No Proxy: hubproxy.docker.internal
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  hubproxy.docker.internal:5000
  127.0.0.0/8
 Live Restore Enabled: false

Additional environment details:

OS: Mac OS v10.14.6 (Mojave)

[MartynasAndr]

Same problem after upgrading to docker 20.10.13, before it was working without problems.
EDIT:
Enabling "Use Docker Compose V2" in Docker Desktop fixed the problem

[ndeloof]

docker-compose version 1.29 does not support this new attribute introduced by the compose specification, this only can be used with compose v2
@glours @ulyssessouza maybe we should add support for this (at least, ignore it) in python codebase to avoid such compatibility issue?

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[stale]

This issue has been automatically closed because it had not recent activity during the stale period.