Bash file completion not working for docker stack deploy -c

[geki007]

Description

I think since "new bash completion" the completion for docker stack deploy (-c arg) does not work like before

Reproduce

1. Open Terminal
2. Enable bash completion
3. docker stack deploy -c <PRESS TAB for bash file completion>

Expected behavior

-c ... does not complete filenames but it should
If you enter something or delete -c and press TAB you see it only completes stack names

docker version

Client: Docker Engine - Community
 Version:           29.1.2
 API version:       1.52
 Go version:        go1.25.5
 Git commit:        890dcca
 Built:             Tue Dec  2 21:55:45 2025
 OS/Arch:           linux/amd64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          29.1.2
  API version:      1.52 (minimum version 1.44)
  Go version:       go1.25.5
  Git commit:       de45c2a
  Built:            Tue Dec  2 21:55:45 2025
  OS/Arch:          linux/amd64
  Experimental:     true
 containerd:
  Version:          v2.2.0
  GitCommit:        1c4457e00facac03ce1d75f7b6777a7a851e5c41
 runc:
  Version:          1.3.4
  GitCommit:        v1.3.4-0-gd6d73eb8
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

docker info

Client: Docker Engine - Community
 Version:    29.1.2
 Context:    default
 Debug Mode: false

Server:
 Containers: 6
  Running: 5
  Paused: 0
  Stopped: 1
 Images: 19
 Server Version: 29.1.2
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog

Additional Info

cobra.ShellCompDirectiveNoFileComp could be the cause

cli/cli/command/stack/deploy.go

Line 48 in 890dcca

ValidArgsFunction: completeNames(dockerCLI),

cli/cli/command/stack/cmd.go

Line 64 in 890dcca

return names, cobra.ShellCompDirectiveNoFileComp

[thaJeztah]

Thanks for reporting; you're on the right path, but I don't think the lines you linked to are the ones responsible for this.

In this case, it's because we chose to disable completion for filenames / paths by default for flags; the default is to complete any flag with files, which in 99% of the case is incorrect, so we disabled that functionality;

• cli: disable file-completion by default #6447

For flags that SHOULD provide completion for filenames, we require a completion function to be defined for that flag; similar to

cli/cli/command/container/completion.go

Line 127 in 890dcca

_ = cmd.RegisterFlagCompletionFunc("env-file", completion.FileNames())

So, it looks like that just wasn't implemented yet, but should be easy to add.

[geki007]

For me it's a bug if it was working before :-)

Thanks for the fast and informative response. Now i'm just waiting for the enhancement

[thaJeztah]

I opened a PR to implement it; #6690

[geki007]

Wow and thanks!