fix: handle DOS-style path for Dockerfile in minikube build

Author: ComradeProgrammer

cmd/minikube/cmd/image.go

@@ -30,6 +30,7 @@ import (
 	"k8s.io/minikube/pkg/minikube/exit"
 	"k8s.io/minikube/pkg/minikube/image"
 	"k8s.io/minikube/pkg/minikube/machine"
+	"k8s.io/minikube/pkg/minikube/out"
 	"k8s.io/minikube/pkg/minikube/reason"
 	docker "k8s.io/minikube/third_party/go-dockerclient"
 )
@@ -45,16 +46,17 @@ var imageCmd = &cobra.Command{
 }
 
 var (
-	pull       bool
-	imgDaemon  bool
-	imgRemote  bool
-	overwrite  bool
-	tag        string
-	push       bool
-	dockerFile string
-	buildEnv   []string
-	buildOpt   []string
-	format     string
+	pull                bool
+	imgDaemon           bool
+	imgRemote           bool
+	overwrite           bool
+	tag                 string
+	push                bool
+	dockerFile          string
+	buildEnv            []string
+	buildOpt            []string
+	format              string
+	noDosPathConversion bool
 )
 
 func saveFile(r io.Reader) (string, error) {
@@ -310,6 +312,12 @@ var buildImageCmd = &cobra.Command{
 				// Otherwise, assume it's a tar
 			}
 		}
+		if runtime.GOOS == "windows" && strings.Contains(dockerFile, "\\") && !noDosPathConversion {
+			// if dockerFile is a DOS path, and user did not explicitly forbid this conversion, translate it into UNIX path
+			// because we are going to build this image in UNIX environment
+			out.String("minikube detects that you are using DOS-style path %s. Minikube will convert it to UNIX-style by replacing all \\ to /", dockerFile)
+			dockerFile = strings.ReplaceAll(dockerFile, "\\", "/")
+		}
 		if err := machine.BuildImage(img, dockerFile, tag, push, buildEnv, buildOpt, []*config.Profile{profile}, allNodes, nodeName); err != nil {
 			exit.Error(reason.GuestImageBuild, "Failed to build image", err)
 		}
@@ -393,6 +401,7 @@ func init() {
 	buildImageCmd.Flags().StringArrayVar(&buildOpt, "build-opt", nil, "Specify arbitrary flags to pass to the build. (format: key=value)")
 	buildImageCmd.Flags().StringVarP(&nodeName, "node", "n", "", "The node to build on. Defaults to the primary control plane.")
 	buildImageCmd.Flags().BoolVarP(&allNodes, "all", "", false, "Build image on all nodes.")
+	buildImageCmd.Flags().BoolVarP(&noDosPathConversion, "no-dospath-conversion", "", false, "No automatic conversion from DOS-style path to UNIX-style path for Dockerfile")
 	imageCmd.AddCommand(buildImageCmd)
 	saveImageCmd.Flags().BoolVar(&imgDaemon, "daemon", false, "Cache image to docker daemon")
 	saveImageCmd.Flags().BoolVar(&imgRemote, "remote", false, "Cache image to remote registry")