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7f50a41525
There's no point in setting cmd.ExtraFiles if the fds array is an empty slice. This won't do any harm but is essentially a no-op. Signed-off-by: Mark Ryan <mark.d.ryan@intel.com>
71 lines
2.4 KiB
Go
71 lines
2.4 KiB
Go
/*
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// Copyright (c) 2016 Intel Corporation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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*/
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// Package qemu provides methods and types for launching and managing QEMU
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// instances. Instances can be launched with the LaunchQemu function and
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// managed thereafter via QMPStart and the QMP object that this function
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// returns. To manage a qemu instance after it has been launched you need
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// to pass the -qmp option during launch requesting the qemu instance to create
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// a QMP unix domain manageent socket, e.g.,
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// -qmp unix:/tmp/qmp-socket,server,nowait. For more information see the
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// example below.
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package qemu
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import (
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"bytes"
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"os"
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"os/exec"
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"golang.org/x/net/context"
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)
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// LaunchQemu can be used to launch a new qemu instance by invoking the
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// qemu-system-x86_64 binary.
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//
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// The ctx parameter is not currently used but has been added so that the
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// signature of this function will not need to change when launch cancellation
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// is implemented.
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//
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// params is a slice of options to pass to qemu-system-x86_64 and fds is a
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// list of open file descriptors that are to be passed to the spawned qemu
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// process.
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//
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// This function writes its log output via logger parameter.
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//
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// The function will block until the launched qemu process exits. "", nil
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// will be returned if the launch succeeds. Otherwise a string containing
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// the contents of stderr + a Go error object will be returned.
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func LaunchQemu(ctx context.Context, params []string, fds []*os.File, logger QMPLog) (string, error) {
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errStr := ""
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cmd := exec.Command("qemu-system-x86_64", params...)
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if len(fds) > 0 {
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logger.Infof("Adding extra file %v", fds)
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cmd.ExtraFiles = fds
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}
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var stderr bytes.Buffer
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cmd.Stderr = &stderr
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logger.Infof("launching qemu with: %v", params)
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err := cmd.Run()
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if err != nil {
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logger.Errorf("Unable to launch qemu: %v", err)
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errStr = stderr.String()
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logger.Errorf("%s", errStr)
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}
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return errStr, err
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}
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