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// 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
}
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