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run docker step in host mode (#857)

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## Problem
In host executor mode, uses: docker://<image> step actions fail because
act/runner/step_docker.go always attaches the step container to the job
container's network namespace, which doesn't exist in host mode.

### Example
Run following job in host runner

```yaml
jobs:
  test:
    runs-on: ubuntu-latest-host
    steps:
      - uses: docker://alpine:3.20
        with:
          args: echo hello
```
```
Error:
  failed to start container: Error response from daemon:
    joining network namespace of container:
    No such container: xxxxxx
```

This pr allows the docker step in the host mode

## Testing
I tested following steps on host runner and it worked

```yaml

 - name: Test azure cli action in host mode
   uses: azure/cli@v2
   env:
     RUNNER_OS: Linux
   with:
     inlineScript: echo "hello from azure cli"
 
 - uses: docker://alpine:3.20
   with:
     args: echo hello

```

---------

Co-authored-by: Nicolas <bircni@icloud.com>
Reviewed-on: https://gitea.com/gitea/act_runner/pulls/857
Reviewed-by: Nicolas <bircni@icloud.com>
Co-authored-by: Mirko Sekulic <misha.sekulic@gmail.com>
Co-committed-by: Mirko Sekulic <misha.sekulic@gmail.com>
This commit is contained in:
Mirko Sekulic
2026-04-27 15:26:31 +00:00
committed by Nicolas
parent bad4239d18
commit f2b4dbf05f
2 changed files with 84 additions and 1 deletions
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6
act/runner/step_docker.go
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@@ -116,6 +116,10 @@ func (sd *stepDocker) newStepContainer(ctx context.Context, image string, cmd, e
envList = append(envList, fmt.Sprintf("%s=%s", "RUNNER_TEMP", "/tmp"))
binds, mounts := rc.GetBindsAndMounts()
networkMode := "container:" + rc.jobContainerName()
if rc.IsHostEnv(ctx) {
networkMode = "default"
}
stepContainer := ContainerNewContainer(&container.NewContainerInput{
Cmd: cmd,
Entrypoint: entrypoint,
@@ -126,7 +130,7 @@ func (sd *stepDocker) newStepContainer(ctx context.Context, image string, cmd, e
Name: createSimpleContainerName(rc.jobContainerName(), "STEP-"+step.ID),
Env: envList,
Mounts: mounts,
NetworkMode: "container:" + rc.jobContainerName(),
NetworkMode: networkMode,
Binds: binds,
Stdout: logWriter,
Stderr: logWriter,