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main.go
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main.go
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package main
import (
"fmt"
"io"
"os"
"strings"
"sync"
"time"
"github.com/Microsoft/hcsshim/internal/hcs"
"github.com/Microsoft/hcsshim/internal/uvm"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
const (
kernelArgsArgName = "kernel-args"
rootFSTypeArgName = "root-fs-type"
vpMemMaxCountArgName = "vpmem-max-count"
vpMemMaxSizeArgName = "vpmem-max-size"
cpusArgName = "cpus"
memoryArgName = "memory"
allowOvercommitArgName = "allow-overcommit"
enableDeferredCommitArgName = "enable-deferred-commit"
measureArgName = "measure"
parallelArgName = "parallel"
countArgName = "count"
kernelDirectArgName = "kernel-direct"
execCommandLineArgName = "exec"
forwardStdoutArgName = "fwd-stdout"
forwardStderrArgName = "fwd-stderr"
debugArgName = "debug"
outputHandlingArgName = "output-handling"
consolePipeArgName = "console-pipe"
)
func main() {
app := cli.NewApp()
app.Name = "uvmboot"
app.Usage = "Boot a utility VM"
app.Flags = []cli.Flag{
cli.Uint64Flag{
Name: cpusArgName,
Usage: "Number of CPUs on the UVM. Uses hcsshim default if not specified",
},
cli.UintFlag{
Name: memoryArgName,
Usage: "Amount of memory on the UVM, in MB. Uses hcsshim default if not specified",
},
cli.BoolFlag{
Name: measureArgName,
Usage: "Measure wall clock time of the UVM run",
},
cli.IntFlag{
Name: parallelArgName,
Value: 1,
Usage: "Number of UVMs to boot in parallel",
},
cli.IntFlag{
Name: countArgName,
Value: 1,
Usage: "Total number of UVMs to run",
},
cli.BoolFlag{
Name: allowOvercommitArgName,
Usage: "Allow memory overcommit on the UVM",
},
cli.BoolFlag{
Name: enableDeferredCommitArgName,
Usage: "Enable deferred commit on the UVM",
},
cli.BoolFlag{
Name: debugArgName,
Usage: "Enable debug level logging in HCSShim",
},
}
app.Commands = []cli.Command{
{
Name: "lcow",
Usage: "Boot an LCOW UVM",
Flags: []cli.Flag{
cli.StringFlag{
Name: kernelArgsArgName,
Value: "",
Usage: "Additional arguments to pass to the kernel",
},
cli.StringFlag{
Name: rootFSTypeArgName,
Usage: "Either 'initrd' or 'vhd'. (default: 'vhd' if rootfs.vhd exists)",
},
cli.UintFlag{
Name: vpMemMaxCountArgName,
Usage: "Number of VPMem devices on the UVM. Uses hcsshim default if not specified",
},
cli.Uint64Flag{
Name: vpMemMaxSizeArgName,
Usage: "Size of each VPMem device, in MB. Uses hcsshim default if not specified",
},
cli.BoolFlag{
Name: kernelDirectArgName,
Usage: "Use kernel direct booting for UVM (default: true on builds >= 18286)",
},
cli.StringFlag{
Name: execCommandLineArgName,
Usage: "Command to execute in the UVM.",
},
cli.BoolFlag{
Name: forwardStdoutArgName,
Usage: "Whether stdout from the process in the UVM should be forwarded",
},
cli.BoolFlag{
Name: forwardStderrArgName,
Usage: "Whether stderr from the process in the UVM should be forwarded",
},
cli.StringFlag{
Name: outputHandlingArgName,
Usage: "Controls how output from UVM is handled. Use 'stdout' to print all output to stdout",
},
cli.StringFlag{
Name: consolePipeArgName,
Usage: "Named pipe for serial console output (which will be enabled)",
},
},
Action: func(c *cli.Context) error {
if c.GlobalBool("debug") {
logrus.SetLevel(logrus.DebugLevel)
}
parallelCount := c.GlobalInt(parallelArgName)
var wg sync.WaitGroup
wg.Add(parallelCount)
workChan := make(chan int)
runFunc := func(workChan <-chan int) {
for {
i, ok := <-workChan
if !ok {
wg.Done()
return
}
id := fmt.Sprintf("uvmboot-%d", i)
options := uvm.NewDefaultOptionsLCOW(id, "")
options.UseGuestConnection = false
if c.GlobalIsSet(cpusArgName) {
options.ProcessorCount = int32(c.GlobalUint64(cpusArgName))
}
if c.GlobalIsSet(memoryArgName) {
options.MemorySizeInMB = int32(c.GlobalUint64(memoryArgName))
}
if c.GlobalIsSet(allowOvercommitArgName) {
options.AllowOvercommit = c.GlobalBool(allowOvercommitArgName)
}
if c.GlobalIsSet(enableDeferredCommitArgName) {
options.EnableDeferredCommit = c.GlobalBool(enableDeferredCommitArgName)
}
if c.IsSet(kernelDirectArgName) {
options.KernelDirect = c.Bool(kernelDirectArgName)
}
if c.IsSet(rootFSTypeArgName) {
switch strings.ToLower(c.String(rootFSTypeArgName)) {
case "initrd":
options.RootFSFile = uvm.InitrdFile
options.PreferredRootFSType = uvm.PreferredRootFSTypeInitRd
case "vhd":
options.RootFSFile = uvm.VhdFile
options.PreferredRootFSType = uvm.PreferredRootFSTypeVHD
default:
logrus.Fatalf("Unrecognized value '%s' for option %s", c.String(rootFSTypeArgName), rootFSTypeArgName)
}
}
if c.IsSet(kernelArgsArgName) {
options.KernelBootOptions = c.String(kernelArgsArgName)
}
if c.IsSet(vpMemMaxCountArgName) {
options.VPMemDeviceCount = uint32(c.Uint(vpMemMaxCountArgName))
}
if c.IsSet(vpMemMaxSizeArgName) {
options.VPMemSizeBytes = c.Uint64(vpMemMaxSizeArgName) * 1024 * 1024 // convert from MB to bytes
}
if c.IsSet(execCommandLineArgName) {
options.ExecCommandLine = c.String(execCommandLineArgName)
}
if c.IsSet(forwardStdoutArgName) {
options.ForwardStdout = c.Bool(forwardStdoutArgName)
}
if c.IsSet(forwardStderrArgName) {
options.ForwardStderr = c.Bool(forwardStderrArgName)
}
if c.IsSet(outputHandlingArgName) {
switch strings.ToLower(c.String(outputHandlingArgName)) {
case "stdout":
options.OutputHandler = uvm.OutputHandler(func(r io.Reader) { io.Copy(os.Stdout, r) })
default:
logrus.Fatalf("Unrecognized value '%s' for option %s", c.String(outputHandlingArgName), outputHandlingArgName)
}
}
if c.IsSet(consolePipeArgName) {
options.ConsolePipe = c.String(consolePipeArgName)
}
if err := run(options); err != nil {
logrus.WithField("uvm-id", id).Error(err)
}
}
}
for i := 0; i < parallelCount; i++ {
go runFunc(workChan)
}
start := time.Now()
for i := 0; i < c.GlobalInt(countArgName); i++ {
workChan <- i
}
close(workChan)
wg.Wait()
if c.GlobalBool(measureArgName) {
fmt.Println("Elapsed time:", time.Since(start))
}
return nil
},
},
}
err := app.Run(os.Args)
if err != nil {
logrus.Fatal(err)
}
}
func run(options *uvm.OptionsLCOW) error {
uvm, err := uvm.CreateLCOW(options)
if err != nil {
return err
}
defer uvm.Close()
if err := uvm.Start(); err != nil {
return err
}
if err := uvm.WaitExpectedError(hcs.ErrVmcomputeUnexpectedExit); err != nil {
return err
}
return nil
}