disable starting the daemon on windows

.drone.yml

@@ -59,7 +59,7 @@ steps:
   commands:
   # TODO use the new DRONE_SEMVER_SHORT environment variables to
   # publish docker images for tag events.
-  - go build -o release/windows/amd64/drone-docker.exe
+  - go build -o release/windows/amd64/drone-docker.exe ./cmd/drone-docker
   - docker login -u $env:USERNAME -p $env:PASSWORD
   - docker build -f docker/docker/Dockerfile.windows.1809 -t plugins/docker:windows-1809-amd64 .
   - docker push plugins/docker:windows-1809-amd64
@@ -97,7 +97,7 @@ steps:
   commands:
   # TODO use the new DRONE_SEMVER_SHORT environment variables to
   # publish docker images for tag events.
-  - go build -o release/windows/amd64/drone-docker.exe
+  - go build -o release/windows/amd64/drone-docker.exe ./cmd/drone-docker
   - docker login -u $env:USERNAME -p $env:PASSWORD
   - docker build -f docker/docker/Dockerfile.windows.1903 -t plugins/docker:windows-1903-amd64 .
   - docker push plugins/docker:windows-1903-amd64

daemon.go

@@ -0,0 +1,26 @@
+// +build !windows
+
+package docker
+
+import (
+	"io/ioutil"
+	"os"
+)
+
+const dockerExe = "/usr/local/bin/docker"
+const dockerdExe = "/usr/local/bin/dockerd"
+
+func (p Plugin) startDaemon() {
+	cmd := commandDaemon(p.Daemon)
+	if p.Daemon.Debug {
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+	} else {
+		cmd.Stdout = ioutil.Discard
+		cmd.Stderr = ioutil.Discard
+	}
+	go func() {
+		trace(cmd)
+		cmd.Run()
+	}()
+}

daemon_win.go

@@ -0,0 +1,10 @@
+// +build windows
+
+package docker
+
+const dockerExe = "C:\\bin\\docker.exe"
+const dockerdExe = ""
+
+func (p Plugin) startDaemon() {
+	// this is a no-op on windows
+}

docker.go

@@ -2,7 +2,6 @@ package docker
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"strings"
@@ -69,18 +68,7 @@ type (
 func (p Plugin) Exec() error {
 	// start the Docker daemon server
 	if !p.Daemon.Disabled {
-		cmd := commandDaemon(p.Daemon)
+		p.startDaemon()
-		if p.Daemon.Debug {
-			cmd.Stdout = os.Stdout
-			cmd.Stderr = os.Stderr
-		} else {
-			cmd.Stdout = ioutil.Discard
-			cmd.Stderr = ioutil.Discard
-		}
-		go func() {
-			trace(cmd)
-			cmd.Run()
-		}()
 	}
 
 	// poll the docker daemon until it is started. This ensures the daemon is
@@ -154,9 +142,6 @@ func (p Plugin) Exec() error {
 	return nil
 }
 
-const dockerExe = "/usr/local/bin/docker"
-const dockerdExe = "/usr/local/bin/dockerd"
-
 // helper function to create the docker login command.
 func commandLogin(login Login) *exec.Cmd {
 	if login.Email != "" {

docker/docker/Dockerfile.windows.1903

@@ -13,7 +13,8 @@ RUN [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tl
     Invoke-WebRequest $('https://github.com/docker/toolbox/releases/download/v{0}/DockerToolbox-{0}.exe' -f $env:DOCKER_VERSION) -OutFile 'dockertoolbox.exe' -UseBasicParsing
 RUN /innoextract.exe dockertoolbox.exe
 
-FROM mcr.microsoft.com/windows/servercore:1903
+FROM mcr.microsoft.com/windows/nanoserver:1903
+USER ContainerAdministrator
 
 LABEL maintainer="Drone.IO Community <drone-dev@googlegroups.com>" `
   org.label-schema.name="Drone Docker" `
@@ -21,6 +22,7 @@ LABEL maintainer="Drone.IO Community <drone-dev@googlegroups.com>" `
   org.label-schema.schema-version="1.0"
 
 RUN mkdir C:\bin
+COPY --from=download /windows/system32/netapi32.dll /windows/system32/netapi32.dll
 COPY --from=download /app/docker.exe C:/bin/docker.exe
 ADD release/windows/amd64/drone-docker.exe C:/bin/drone-docker.exe
 ENTRYPOINT [ "C:\\bin\\drone-docker.exe" ]