set MountConfig capabilities for all in-tree drivers

drivers/docker/config.go

@@ -376,6 +376,7 @@ var (
 			drivers.NetIsolationModeTask,
 		},
 		MustInitiateNetwork: true,
+		MountConfigs:        drivers.MountConfigSupportAll,
 	}
 )
 

drivers/exec/driver.go

@@ -83,6 +83,7 @@ var (
 			drivers.NetIsolationModeHost,
 			drivers.NetIsolationModeGroup,
 		},
+		MountConfigs: drivers.MountConfigSupportAll,
 	}
 )
 

drivers/java/driver.go

@@ -87,6 +87,7 @@ var (
 			drivers.NetIsolationModeHost,
 			drivers.NetIsolationModeGroup,
 		},
+		MountConfigs: drivers.MountConfigSupportNone,
 	}
 
 	_ drivers.DriverPlugin = (*Driver)(nil)
@@ -95,6 +96,7 @@ var (
 func init() {
 	if runtime.GOOS == "linux" {
 		capabilities.FSIsolation = drivers.FSIsolationChroot
+		capabilities.MountConfigs = drivers.MountConfigSupportAll
 	}
 }
 

drivers/mock/driver.go

@@ -154,9 +154,10 @@ func NewMockDriver(logger hclog.Logger) drivers.DriverPlugin {
 	logger = logger.Named(pluginName)
 
 	capabilities := &drivers.Capabilities{
-		SendSignals: true,
-		Exec:        true,
-		FSIsolation: drivers.FSIsolationNone,
+		SendSignals:  true,
+		Exec:         true,
+		FSIsolation:  drivers.FSIsolationNone,
+		MountConfigs: drivers.MountConfigSupportNone,
 	}
 
 	return &Driver{

drivers/qemu/driver.go

@@ -98,9 +98,10 @@ var (
 	// capabilities is returned by the Capabilities RPC and indicates what
 	// optional features this driver supports
 	capabilities = &drivers.Capabilities{
-		SendSignals: false,
-		Exec:        false,
-		FSIsolation: drivers.FSIsolationImage,
+		SendSignals:  false,
+		Exec:         false,
+		FSIsolation:  drivers.FSIsolationImage,
+		MountConfigs: drivers.MountConfigSupportNone,
 	}
 
 	_ drivers.DriverPlugin = (*Driver)(nil)

drivers/rawexec/driver.go

@@ -101,6 +101,7 @@ var (
 			drivers.NetIsolationModeHost,
 			drivers.NetIsolationModeGroup,
 		},
+		MountConfigs: drivers.MountConfigSupportNone,
 	}
 )