cmd/composer: move currentArch helper to common package

The helper function might be useful also in different parts of the project.

cmd/osbuild-composer/main.go

@@ -8,8 +8,8 @@ import (
 	"io/ioutil"
 	"log"
 	"os"
-	"runtime"
 
+	"github.com/osbuild/osbuild-composer/internal/common"
 	"github.com/osbuild/osbuild-composer/internal/distro"
 	"github.com/osbuild/osbuild-composer/internal/jobqueue"
 	"github.com/osbuild/osbuild-composer/internal/rpmmd"
@@ -19,20 +19,6 @@ import (
 	"github.com/coreos/go-systemd/activation"
 )
 
-func currentArch() string {
-	if runtime.GOARCH == "amd64" {
-		return "x86_64"
-	} else if runtime.GOARCH == "arm64" {
-		return "aarch64"
-	} else if runtime.GOARCH == "ppc64le" {
-		return "ppc64le"
-	} else if runtime.GOARCH == "s390x" {
-		return "s390x"
-	} else {
-		panic("unsupported architecture")
-	}
-}
-
 type connectionConfig struct {
 	CACertFile     string
 	ServerKeyFile  string
@@ -103,7 +89,7 @@ func main() {
 	store := store.New(&stateDir, distribution, *distros)
 
 	jobAPI := jobqueue.New(logger, store)
-	weldrAPI := weldr.New(rpm, currentArch(), distribution, logger, store)
+	weldrAPI := weldr.New(rpm, common.CurrentArch(), distribution, logger, store)
 
 	go jobAPI.Serve(jobListener)
 

internal/common/helpers.go

@@ -0,0 +1,17 @@
+package common
+
+import "runtime"
+
+func CurrentArch() string {
+	if runtime.GOARCH == "amd64" {
+		return "x86_64"
+	} else if runtime.GOARCH == "arm64" {
+		return "aarch64"
+	} else if runtime.GOARCH == "ppc64le" {
+		return "ppc64le"
+	} else if runtime.GOARCH == "s390x" {
+		return "s390x"
+	} else {
+		panic("unsupported architecture")
+	}
+}