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// Copyright 2019 The gVisor Authors.
//
// 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 dump contains data dump tools.
//
// The interface used by the package corresponds to the tool generated by the
// nogo_dump_tool rule.
//
// This package is separate in order to avoid a dependency cycle.
package dump
import (
"flag"
"fmt"
"io"
"os"
"os/exec"
)
var (
// Binary is the binary under analysis.
//
// See Reader, below.
binary = flag.String("binary", "", "binary under analysis")
// Reader is the input stream.
//
// This may be set instead of Binary.
Reader io.Reader
// Tool is the tool used to dump a binary.
tool = flag.String("dump_tool", "", "tool used to dump a binary")
)
// Command returns a command that will emit the dumped object on stdout.
//
// You must call Wait on the resulting command.
func Command() (*exec.Cmd, io.Reader, error) {
var (
args []string
stdin io.Reader
)
if *binary != "" {
args = append(args, *binary)
*binary = "" // Clear.
} else if Reader != nil {
stdin = Reader
Reader = nil // Clear.
} else {
// We have no input stream or binary.
return nil, nil, fmt.Errorf("no binary or reader provided!")
}
// Construct our command.
cmd := exec.Command(*tool, args...)
cmd.Stdin = stdin
cmd.Stderr = os.Stderr
out, err := cmd.StdoutPipe()
if err != nil {
return nil, nil, err
}
if err := cmd.Start(); err != nil {
return nil, nil, err
}
return cmd, out, err
}
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