[BUG] Remote context with ssh:// URL not working #13668
Description
Description
Hello everybody,
We are facing a problem when trying to use a remote context with a ssh URL. When we clone a github repository to the local machine and use that as build context, we can successfully build the image. When we do the same with the same repository using a remote context URL, the build process returns an error saying it is not able to find a Dockerfile.
As a sidenote: In our internal use case, where we originally faced this problem, we are not using github, but an internal git repository on a non-standard ssh-port. So, we have to use the ssh:// URL format to be able to provide the correct port. That is the reason why we write the github-URL in this example in such a "complicated" way. We just used this public github repository as a way to showcase the problem. But internally, we need to set a different port for ssh access (and there is no https).
I originally created the issue in the buildx project, but after some additional testing, it seems to be a compose problem after all.
Steps To Reproduce
services:
buildtestlocal:
image: buildtestlocal:latest
build:
context: welcome-to-docker
dockerfile: Dockerfile
buildtestremote:
image: buildtestremote:latest
build:
context: ssh://git@github.com:22/docker/welcome-to-docker.git
dockerfile: Dockerfile
ssh:
- default=~/.ssh/id_ed25519 # there is no agent running locally, so I hardcoded my ssh key heregit clone ssh://git@github.com:22/docker/welcome-to-docker.git
docker compose build buildtestlocal
docker compose build buildtestremoteThe first compose command works, the second one leads to an error message:
# buildtestlocal
[+] Building 1.0s (13/13) FINISHED
=> [internal] load local bake definitions 0.0s
=> => reading from stdin 587B 0.0s
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 654B 0.0s
=> [internal] load metadata for docker.io/library/node:22-alpine 0.8s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 52B 0.0s
=> [1/6] FROM docker.io/library/node:22-alpine@sha256:8094c002d08262dba12645a3b4a15cd6cd627d30bc782f53229a2ec13ee22a00 0.0s
=> [internal] load build context 0.0s
=> => transferring context: 393B 0.0s
=> CACHED [2/6] WORKDIR /app 0.0s
=> CACHED [3/6] COPY package*.json ./ 0.0s
=> CACHED [4/6] COPY ./src ./src 0.0s
=> CACHED [5/6] COPY ./public ./public 0.0s
=> CACHED [6/6] RUN npm install && npm install -g serve@latest && npm run build && rm -fr node_modules 0.0s
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => writing image sha256:cab5d044e2d25a91c77b93ee878a27ba7794d780b855ef2ab33b9839f63453ea 0.0s
=> => naming to docker.io/library/buildtestlocal:latest 0.0s
=> resolving provenance for metadata file 0.0s
[+] build 1/1
✔ Image buildtestlocal:latest Built
# buildtestremote
[+] Building 3.2s (2/2) FINISHED
=> [internal] load local bake definitions 0.0s
=> => reading from stdin 664B 0.0s
=> CACHED [internal] load git source ssh://git@github.com:22/docker/welcome-to-docker.git 2.8s
[+] build 0/1
⠙ Image buildtestremote:latest Building 3.2s
failed to solve: failed to read dockerfile: open ssh:/git@github.com:22/docker/welcome-to-docker.git/Dockerfile: no such file or directory
I noticed that there is only one slash in the output printed to console (ssh:/). I do not know if this has anything to do with the problem, though.
Building the same images manually (without compose) works as expected:
git clone ssh://git@github.com:22/docker/welcome-to-docker.git
docker image build -t buildtestlocal:latest welcome-to-docker/
docker image build -t buildtestremote:latest --ssh default=~/.ssh/id_ed25519 ssh://git@github.com:22/docker/welcome-to-docker.gitCompose Version
Docker Compose version v5.1.1
Docker Environment
Client: Docker Engine - Community
Version: 29.3.0
Context: default
Debug Mode: false
Plugins:
buildx: Docker Buildx (Docker Inc.)
Version: v0.31.1
Path: /usr/libexec/docker/cli-plugins/docker-buildx
compose: Docker Compose (Docker Inc.)
Version: v5.1.1
Path: /usr/libexec/docker/cli-plugins/docker-compose
Server:
Containers: 5
Running: 5
Paused: 0
Stopped: 0
Images: 9
Server Version: 29.3.0
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
CDI spec directories:
/etc/cdi
/var/run/cdi
Swarm: inactive
Runtimes: io.containerd.runc.v2 runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 301b2dac98f15c27117da5c8af12118a041a31d9
runc version: v1.3.4-0-gd6d73eb8
init version: de40ad0
Security Options:
seccomp
Profile: builtin
cgroupns
Kernel Version: 6.6.87.2-microsoft-standard-WSL2
Operating System: Ubuntu 24.04.4 LTS
OSType: linux
Architecture: x86_64
CPUs: 16
Total Memory: 19.53GiB
Name: LT-01-MDa3
ID: 22b2e86d-059f-4c6f-9805-5fba1762191f
Docker Root Dir: /var/lib/docker
Debug Mode: false
Experimental: false
Insecure Registries:
::1/128
127.0.0.0/8
Live Restore Enabled: false
Default Address Pools:
Base: 172.16.0.0/12, Size: 20
Firewall Backend: iptables
Anything else?
No response