image-builder: fix cross-arch uploading

This commit fixes the cross-arch uploading in the most simple
case by reading the `--arch` when `image-builder build --upload`
is used. Note that this is not a complete fix as it will not
take boot mode into account nor will it (by default) DTRT when
`image-builder upload` is used on a previously build images
for a different architecture.

Thanks to `FrostyX` for reporting the issue.

cmd/image-builder/main.go

@@ -477,6 +477,7 @@ operating systems like Fedora, CentOS and RHEL with easy customizations support.
 	uploadCmd.Flags().String("aws-ami-name", "", "name for the AMI in AWS (only for type=ami)")
 	uploadCmd.Flags().String("aws-bucket", "", "target S3 bucket name for intermediate storage when creating AMI (only for type=ami)")
 	uploadCmd.Flags().String("aws-region", "", "target region for AWS uploads (only for type=ami)")
+	uploadCmd.Flags().String("arch", "", "upload for the given architecture")
 	rootCmd.AddCommand(uploadCmd)
 
 	buildCmd := &cobra.Command{

cmd/image-builder/upload.go

@@ -84,6 +84,10 @@ func uploaderForCmdAWS(cmd *cobra.Command) (cloud.Uploader, error) {
 	if err != nil {
 		return nil, err
 	}
+	targetArch, err := cmd.Flags().GetString("arch")
+	if err != nil {
+		return nil, err
+	}
 
 	var missing []string
 	requiredArgs := []string{"aws-ami-name", "aws-bucket", "aws-region"}
@@ -103,8 +107,11 @@ func uploaderForCmdAWS(cmd *cobra.Command) (cloud.Uploader, error) {
 
 		return nil, fmt.Errorf("%w: %q", ErrMissingUploadConfig, missing)
 	}
+	opts := &awscloud.UploaderOptions{
+		TargetArch: targetArch,
+	}
 
-	return awscloudNewUploader(region, bucketName, amiName, nil)
+	return awscloudNewUploader(region, bucketName, amiName, opts)
 }
 
 func cmdUpload(cmd *cobra.Command, args []string) error {

cmd/image-builder/upload_test.go

@@ -51,41 +51,54 @@ func TestUploadWithAWSMock(t *testing.T) {
 	assert.NoError(t, err)
 
 	var regionName, bucketName, amiName string
-	var fa fakeAwsUploader
-	restore := main.MockAwscloudNewUploader(func(region string, bucket string, ami string, opts *awscloud.UploaderOptions) (cloud.Uploader, error) {
-		regionName = region
-		bucketName = bucket
-		amiName = ami
-		return &fa, nil
-	})
-	defer restore()
+	var uploadOpts *awscloud.UploaderOptions
 
-	var fakeStdout bytes.Buffer
-	restore = main.MockOsStdout(&fakeStdout)
-	defer restore()
+	for _, tc := range []struct {
+		targetArchArg      string
+		expectedUploadArch string
+	}{
+		{"", ""},
+		{"aarch64", "aarch64"},
+	} {
+		var fa fakeAwsUploader
+		restore := main.MockAwscloudNewUploader(func(region string, bucket string, ami string, opts *awscloud.UploaderOptions) (cloud.Uploader, error) {
+			regionName = region
+			bucketName = bucket
+			amiName = ami
+			uploadOpts = opts
+			return &fa, nil
+		})
+		defer restore()
 
-	restore = main.MockOsArgs([]string{
-		"upload",
-		"--to=aws",
-		"--aws-region=aws-region-1",
-		"--aws-bucket=aws-bucket-2",
-		"--aws-ami-name=aws-ami-3",
-		fakeImageFilePath,
-	})
-	defer restore()
+		var fakeStdout bytes.Buffer
+		restore = main.MockOsStdout(&fakeStdout)
+		defer restore()
 
-	err = main.Run()
-	require.NoError(t, err)
+		restore = main.MockOsArgs([]string{
+			"upload",
+			"--to=aws",
+			"--aws-region=aws-region-1",
+			"--aws-bucket=aws-bucket-2",
+			"--aws-ami-name=aws-ami-3",
+			"--arch=" + tc.targetArchArg,
+			fakeImageFilePath,
+		})
+		defer restore()
 
-	assert.Equal(t, regionName, "aws-region-1")
-	assert.Equal(t, bucketName, "aws-bucket-2")
-	assert.Equal(t, amiName, "aws-ami-3")
+		err = main.Run()
+		require.NoError(t, err)
 
-	assert.Equal(t, 0, fa.checkCalls)
-	assert.Equal(t, 1, fa.uploadAndRegisterCalls)
-	assert.Equal(t, fakeDiskContent, fa.uploadAndRegisterRead.String())
-	// progress was rendered
-	assert.Contains(t, fakeStdout.String(), "--] 100.00%")
+		assert.Equal(t, regionName, "aws-region-1")
+		assert.Equal(t, bucketName, "aws-bucket-2")
+		assert.Equal(t, amiName, "aws-ami-3")
+		assert.Equal(t, &awscloud.UploaderOptions{TargetArch: tc.expectedUploadArch}, uploadOpts)
+
+		assert.Equal(t, 0, fa.checkCalls)
+		assert.Equal(t, 1, fa.uploadAndRegisterCalls)
+		assert.Equal(t, fakeDiskContent, fa.uploadAndRegisterRead.String())
+		// progress was rendered
+		assert.Contains(t, fakeStdout.String(), "--] 100.00%")
+	}
 }
 
 func TestUploadCmdlineErrors(t *testing.T) {