[BUG] compose file completion does not work

[nicks]

Description

Compose should autocomplete -f to a file name.

Steps To Reproduce

In a shell, type:

docker compose -f <tab>

Expected result:
a list of files in the current directory

Actual result:
Autocompletes to "y"

docker compose -f y
yaml  yml

Additional notes:

docker-compose-v1 behaves correctly

You can also reproduce as:

docker-compose __complete -f ""
yaml
yml
:8
Completion ended with directive: ShellCompDirectiveFilterFileExt

Compose Version

Docker Compose version v2.17.0-rc.1

Docker Environment

Client:
 Context:    desktop-linux
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.10.4
    Path:     /usr/lib/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.17.0-rc.1
    Path:     /usr/lib/docker/cli-plugins/docker-compose
  dev: Docker Dev Environments (Docker Inc.)
    Version:  v0.1.0
    Path:     /usr/lib/docker/cli-plugins/docker-dev
  extension: Manages Docker extensions (Docker Inc.)
    Version:  v0.2.18
    Path:     /usr/lib/docker/cli-plugins/docker-extension
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc.)
    Version:  0.6.0
    Path:     /usr/lib/docker/cli-plugins/docker-sbom
  scan: Docker Scan (Docker Inc.)
    Version:  v0.25.0
    Path:     /usr/lib/docker/cli-plugins/docker-scan
  scout: Command line tool for Docker Scout (Docker Inc.)
    Version:  v0.6.0
    Path:     /usr/lib/docker/cli-plugins/docker-scout
WARNING: Plugin "/usr/lib/docker/cli-plugins/docker-compose.14.backup" is not valid: plugin candidate "compose.14.backup" did not match "^[a-z][a-z0-9]*$"

Server:
 Containers: 18
  Running: 11
  Paused: 0
  Stopped: 7
 Images: 20
 Server Version: 20.10.23
 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: 2456e983eb9e37e47538f59ea18f2043c9a73640
 runc version: v1.1.4-0-g5fd4c4d
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
  cgroupns
 Kernel Version: 5.15.49-linuxkit
 Operating System: Docker Desktop
 OSType: linux
 Architecture: x86_64
 CPUs: 6
 Total Memory: 7.526GiB
 Name: docker-desktop
 ID: 6UI5:YCLD:M374:NQHR:XYW5:AJAQ:WBUQ:DTN4:5RZV:GV65:6HNE:ZTGY
 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/
 Experimental: false
 Insecure Registries:
  hubproxy.docker.internal:5555
  127.0.0.0/8
 Live Restore Enabled: false

Anything else?

No response

[laurazard]

I opened docker/cli#4136 that should address this :) Other than that, the completion scripts generated by docker completion <bash/zsh/fish> should not have that problem since they use the Cobra V2 completion.

We've closed other issues about this here since it's not really a "Compose" problem, so please track this over in the CLI repo.

[nicks]

Wooo thanks @laurazard