`DaemonHost()` returns `http://docker.example.com` for ssh transport
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Description
Description
cli.DaemonHost() gives http://docker.example.com when docker host is set to ssh
the behavior comes from getConnectionHelper in https://github.com/docker/cli/blob/84038691220e7ba3329a177e4e3357b4ee0e3a52/cli/connhelper/connhelper.go#L64 the Host is set to http://docker.example.com in connection helper and later updated the host attribute in the cli.Client at https://github.com/docker/cli/blob/84038691220e7ba3329a177e4e3357b4ee0e3a52/cli/context/docker/load.go#L115
the daemon host is specially useful in docker compose when we want to know if the docker host it's remote or not, like you are doing here https://github.com/docker/cli/blob/84038691220e7ba3329a177e4e3357b4ee0e3a52/cli/context/docker/load.go#L127
Reproduce
DOCKER_HOST="ssh://user@1.2.3.4" docker
Expected behavior
we should be able to know whenever the docker cli is accessing the docker host via ssh, unix, pipe, etc
basically we should be able to access docker host used
docker version
Client: Docker Engine - Community
Version: 28.2.2
API version: 1.50
Go version: go1.24.3
Git commit: e6534b4
Built: Fri May 30 12:07:26 2025
OS/Arch: linux/amd64
Context: default
Server: Docker Engine - Community
Engine:
Version: 28.2.2
API version: 1.50 (minimum version 1.24)
Go version: go1.24.3
Git commit: 45873be
Built: Fri May 30 12:07:26 2025
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.7.27
GitCommit: 05044ec0a9a75232cad458027ca83437aae3f4da
runc:
Version: 1.2.5
GitCommit: v1.2.5-0-g59923ef
docker-init:
Version: 0.19.0
GitCommit: de40ad0
docker info
Client: Docker Engine - Community
Version: 28.2.2
Context: default
Debug Mode: false
Plugins:
buildx: Docker Buildx (Docker Inc.)
Version: v0.24.0
Path: /usr/libexec/docker/cli-plugins/docker-buildx
compose: Docker Compose (Docker Inc.)
Version: v2.36.2
Path: /usr/libexec/docker/cli-plugins/docker-compose
Additional Info
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with getConnectionHelper in cli/connhelper/connhelper.go and the client host handling in cli/context/docker/load.go. Reproduce the behavior with DOCKER_HOST="ssh://user@1.2.3.4" and trace how DaemonHost() is derived. Done means the CLI exposes the actual configured transport, including ssh, unix, and pipe, so callers can distinguish remote from local hosts.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- go
- Domain
- cli
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 52/100