Check in gVisor.

PiperOrigin-RevId: 194583126
Change-Id: Ica1d8821a90f74e7e745962d71801c598c652463

1 files changed, 77 insertions, 0 deletions

diff --git a/runsc/cmd/cmd.go b/runsc/cmd/cmd.go
new file mode 100644
index 000000000..d4b834213
--- /dev/null
+++ b/runsc/cmd/cmd.go
@@ -0,0 +1,77 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package cmd holds implementations of the runsc commands.
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+
+	"flag"
+	"gvisor.googlesource.com/gvisor/pkg/log"
+)
+
+// Fatalf logs to stderr and exits with a failure status code.
+func Fatalf(s string, args ...interface{}) {
+	// If runsc is being invoked by docker or cri-o, then we might not have
+	// access to stderr, so we log a serious-looking warning in addition to
+	// writing to stderr.
+	log.Warningf("FATAL ERROR: "+s, args...)
+	fmt.Fprintf(os.Stderr, s+"\n", args...)
+	// Return an error that is unlikely to be used by the application.
+	os.Exit(128)
+}
+
+// commandLineFlags returns a slice of all top-level command line flags that
+// have been set.
+func commandLineFlags() []string {
+	var args []string
+	flag.CommandLine.Visit(func(f *flag.Flag) {
+		args = append(args, fmt.Sprintf("--%s=%s", f.Name, f.Value.String()))
+	})
+	return args
+}
+
+// intFlags can be used with int flags that appear multiple times.
+type intFlags []int
+
+// String implements flag.Value.
+func (i *intFlags) String() string {
+	return fmt.Sprintf("%v", *i)
+}
+
+// Get implements flag.Value.
+func (i *intFlags) Get() interface{} {
+	return i
+}
+
+// GetArray returns array of FDs.
+func (i *intFlags) GetArray() []int {
+	return *i
+}
+
+// Set implements flag.Value.
+func (i *intFlags) Set(s string) error {
+	fd, err := strconv.Atoi(s)
+	if err != nil {
+		return fmt.Errorf("invalid flag value: %v", err)
+	}
+	if fd < 0 {
+		return fmt.Errorf("flag value must be greater than 0: %d", fd)
+	}
+	*i = append(*i, fd)
+	return nil
+}