Add flag package to limit visibility.

PiperOrigin-RevId: 294297004

runsc/BUILD

@@ -19,6 +19,7 @@ go_binary(
         "//pkg/sentry/platform",
         "//runsc/boot",
         "//runsc/cmd",
+        "//runsc/flag",
         "//runsc/specutils",
         "@com_github_google_subcommands//:go_default_library",
     ],
@@ -54,6 +55,7 @@ go_binary(
         "//pkg/sentry/platform",
         "//runsc/boot",
         "//runsc/cmd",
+        "//runsc/flag",
         "//runsc/specutils",
         "@com_github_google_subcommands//:go_default_library",
     ],

runsc/cmd/BUILD

@@ -50,6 +50,7 @@ go_library(
         "//runsc/boot/platforms",
         "//runsc/console",
         "//runsc/container",
+        "//runsc/flag",
         "//runsc/fsgofer",
         "//runsc/fsgofer/filter",
         "//runsc/specutils",

runsc/cmd/boot.go

@@ -21,12 +21,12 @@ import (
 	"strings"
 	"syscall"
 
-	"flag"
 	"github.com/google/subcommands"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/boot/platforms"
+	"gvisor.dev/gvisor/runsc/flag"
 	"gvisor.dev/gvisor/runsc/specutils"
 )
 

runsc/cmd/checkpoint.go

@@ -20,11 +20,11 @@ import (
 	"path/filepath"
 	"syscall"
 
-	"flag"
 	"github.com/google/subcommands"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 	"gvisor.dev/gvisor/runsc/specutils"
 )
 

runsc/cmd/create.go

@@ -17,10 +17,10 @@ package cmd
 import (
 	"context"
 
-	"flag"
 	"github.com/google/subcommands"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 	"gvisor.dev/gvisor/runsc/specutils"
 )
 

runsc/cmd/debug.go

@@ -22,12 +22,12 @@ import (
 	"syscall"
 	"time"
 
-	"flag"
 	"github.com/google/subcommands"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/pkg/sentry/control"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 )
 
 // Debug implements subcommands.Command for the "debug" command.

runsc/cmd/delete.go

@@ -19,11 +19,11 @@ import (
 	"fmt"
 	"os"
 
-	"flag"
 	"github.com/google/subcommands"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 )
 
 // Delete implements subcommands.Command for the "delete" command.

runsc/cmd/do.go

@@ -27,12 +27,12 @@ import (
 	"strings"
 	"syscall"
 
-	"flag"
 	"github.com/google/subcommands"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 	"gvisor.dev/gvisor/runsc/specutils"
 )
 

runsc/cmd/events.go

@@ -20,11 +20,11 @@ import (
 	"os"
 	"time"
 
-	"flag"
 	"github.com/google/subcommands"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 )
 
 // Events implements subcommands.Command for the "events" command.

runsc/cmd/exec.go

@@ -27,7 +27,6 @@ import (
 	"syscall"
 	"time"
 
-	"flag"
 	"github.com/google/subcommands"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"gvisor.dev/gvisor/pkg/log"
@@ -37,6 +36,7 @@ import (
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/console"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 	"gvisor.dev/gvisor/runsc/specutils"
 )
 

runsc/cmd/gofer.go

@@ -23,7 +23,6 @@ import (
 	"strings"
 	"syscall"
 
-	"flag"
 	"github.com/google/subcommands"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"golang.org/x/sys/unix"
@@ -32,6 +31,7 @@ import (
 	"gvisor.dev/gvisor/pkg/sync"
 	"gvisor.dev/gvisor/pkg/unet"
 	"gvisor.dev/gvisor/runsc/boot"
+	"gvisor.dev/gvisor/runsc/flag"
 	"gvisor.dev/gvisor/runsc/fsgofer"
 	"gvisor.dev/gvisor/runsc/fsgofer/filter"
 	"gvisor.dev/gvisor/runsc/specutils"

runsc/cmd/help.go

@@ -18,8 +18,8 @@ import (
 	"context"
 	"fmt"
 
-	"flag"
 	"github.com/google/subcommands"
+	"gvisor.dev/gvisor/runsc/flag"
 )
 
 // NewHelp returns a help command for the given commander.

runsc/cmd/install.go

@@ -23,8 +23,8 @@ import (
 	"os"
 	"path"
 
-	"flag"
 	"github.com/google/subcommands"
+	"gvisor.dev/gvisor/runsc/flag"
 )
 
 // Install implements subcommands.Command.

runsc/cmd/kill.go

@@ -21,11 +21,11 @@ import (
 	"strings"
 	"syscall"
 
-	"flag"
 	"github.com/google/subcommands"
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 )
 
 // Kill implements subcommands.Command for the "kill" command.

runsc/cmd/list.go

@@ -22,11 +22,11 @@ import (
 	"text/tabwriter"
 	"time"
 
-	"flag"
 	"github.com/google/subcommands"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 )
 
 // List implements subcommands.Command for the "list" command for the "list" command.

runsc/cmd/pause.go

@@ -17,10 +17,10 @@ package cmd
 import (
 	"context"
 
-	"flag"
 	"github.com/google/subcommands"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 )
 
 // Pause implements subcommands.Command for the "pause" command.

runsc/cmd/ps.go

@@ -18,11 +18,11 @@ import (
 	"context"
 	"fmt"
 
-	"flag"
 	"github.com/google/subcommands"
 	"gvisor.dev/gvisor/pkg/sentry/control"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 )
 
 // PS implements subcommands.Command for the "ps" command.

runsc/cmd/restore.go

@@ -19,10 +19,10 @@ import (
 	"path/filepath"
 	"syscall"
 
-	"flag"
 	"github.com/google/subcommands"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 	"gvisor.dev/gvisor/runsc/specutils"
 )
 

runsc/cmd/resume.go

@@ -17,10 +17,10 @@ package cmd
 import (
 	"context"
 
-	"flag"
 	"github.com/google/subcommands"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 )
 
 // Resume implements subcommands.Command for the "resume" command.

runsc/cmd/run.go

@@ -18,10 +18,10 @@ import (
 	"context"
 	"syscall"
 
-	"flag"
 	"github.com/google/subcommands"
 	"gvisor.dev/gvisor/runsc/boot"
 	"gvisor.dev/gvisor/runsc/container"
+	"gvisor.dev/gvisor/runsc/flag"
 	"gvisor.dev/gvisor/runsc/specutils"
 )