comapre host and target platform

Author: Jaytee-fn

common/common.go

@@ -32,10 +32,12 @@ import (
 	"os/exec"
 	"os/signal"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"time"
 	"unicode"
 
+
 	"github.com/coreos/go-semver/semver"
 	"github.com/fatih/color"
 	"github.com/fnproject/cli/config"
@@ -67,6 +69,12 @@ var ShapeMap = map[string][]string{
 	modelsv2.AppShapeGENERICX86ARM: {"linux/amd64", "linux/arm64"},
 }
 
+var TargetPlatformMap = map[string][] string{
+	modelsv2.AppShapeGENERICX86:    {"amd64"},
+	modelsv2.AppShapeGENERICARM:    {"arm64"},
+	modelsv2.AppShapeGENERICX86ARM: {"multiarch"},
+}
+
 func IsVerbose() bool {
 	return GlobalVerbose || CommandVerbose
 }
@@ -512,17 +520,23 @@ func RunBuild(verbose bool, dir, imageName, dockerfile string, buildArgs []strin
 	go func(done chan<- error) {
 		var dockerBuildCmdArgs []string
 		// Depending whether architecture list is passed or not trigger docker buildx or docker build accordingly
-		var mappedArchitectures []string
+
 		if arch, ok := ShapeMap[shape]; ok {
+			var mappedArchitectures []string
 			mappedArchitectures = append(mappedArchitectures, arch...)
+			var hostedPlatform = runtime.GOARCH
+			if targetPlatform, ok := TargetPlatformMap[shape]; ok {
+				fmt.Printf("hostedPlatform %v targetPlatform %v", hostedPlatform, targetPlatform)
+				// compare target platform and hosted platform
+				// perform docker buildx if they don't match
+			}
 			if containerEngineType == ContainerEngineType {
 				err := initializeContainerBuilder(containerEngineType, mappedArchitectures)
 				if err != nil {
 					done <- err
 					return
 				}
 			}
-
 			dockerBuildCmdArgs = buildXDockerCommand(imageName, dockerfile, buildArgs, noCache, mappedArchitectures)
 			// perform cleanup
 			defer cleanupContainerBuilder(containerEngineType)