driver: remove unused version

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

driver/docker-container/driver.go

@@ -25,7 +25,6 @@ var buildkitImage = "moby/buildkit:master" // TODO: make this verified and confi
 type Driver struct {
 	driver.InitConfig
 	factory driver.Factory
-	version dockertypes.Version
 }
 
 func (d *Driver) Bootstrap(ctx context.Context, l progress.Logger) error {

driver/docker-container/factory.go

@@ -38,12 +38,7 @@ func (f *factory) New(ctx context.Context, cfg driver.InitConfig) (driver.Driver
 		return nil, errors.Errorf("%s driver requires docker API access", f.Name())
 	}
 
-	v, err := cfg.DockerAPI.ServerVersion(ctx)
-	if err != nil {
-		return nil, errors.Wrapf(driver.ErrNotConnecting, err.Error())
-	}
-
-	return &Driver{factory: f, InitConfig: cfg, version: v}, nil
+	return &Driver{factory: f, InitConfig: cfg}, nil
 }
 
 func (f *factory) AllowsInstances() bool {

driver/docker/driver.go

@@ -5,7 +5,6 @@ import (
 	"net"
 	"time"
 
-	dockertypes "github.com/docker/docker/api/types"
 	"github.com/moby/buildkit/client"
 	"github.com/pkg/errors"
 	"github.com/tonistiigi/buildx/driver"
@@ -15,7 +14,6 @@ import (
 type Driver struct {
 	factory driver.Factory
 	driver.InitConfig
-	version dockertypes.Version
 }
 
 func (d *Driver) Bootstrap(ctx context.Context, l progress.Logger) error {

driver/docker/factory.go

@@ -45,12 +45,7 @@ func (f *factory) New(ctx context.Context, cfg driver.InitConfig) (driver.Driver
 		return nil, errors.Errorf("docker driver requires docker API access")
 	}
 
-	v, err := cfg.DockerAPI.ServerVersion(ctx)
-	if err != nil {
-		return nil, errors.Wrapf(driver.ErrNotConnecting, err.Error())
-	}
-
-	return &Driver{factory: f, InitConfig: cfg, version: v}, nil
+	return &Driver{factory: f, InitConfig: cfg}, nil
 }
 
 func (f *factory) AllowsInstances() bool {