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5ccbaf2b59
Ciao will use the new standard library context package from now on. This will allow us to use some of the new standard library functions such as DialContext. Partial fix for issue #541 Signed-off-by: Mark Ryan <mark.d.ryan@intel.com>
75 lines
2.4 KiB
Go
75 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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"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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if logger == nil {
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logger = qmpNullLogger{}
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}
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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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