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prepare-disk.go
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prepare-disk.go
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//go:build windows
package main
import (
gcontext "context"
"github.com/Microsoft/hcsshim/internal/appargs"
"github.com/Microsoft/hcsshim/internal/lcow"
"github.com/Microsoft/hcsshim/internal/oc"
"github.com/Microsoft/hcsshim/internal/uvm"
"github.com/Microsoft/hcsshim/osversion"
"github.com/pkg/errors"
"github.com/urfave/cli"
)
const (
// prepareDiskStr string used to name the command and identity in the logs
prepareDiskStr = "prepare-disk"
)
var prepareDiskCommand = cli.Command{
Name: prepareDiskStr,
Usage: "format a disk with ext4",
Description: "Format a disk with ext4. To be used prior to exposing a pass-through disk. Prerequisite is that disk should be offline ('Get-Disk -Number <disk num> | Set-Disk -IsOffline $true').",
Flags: []cli.Flag{
cli.StringFlag{
Name: "destpath",
Usage: "Required: describes the destination disk path",
},
},
Before: appargs.Validate(),
Action: func(context *cli.Context) (err error) {
ctx, span := oc.StartSpan(gcontext.Background(), prepareDiskStr)
defer span.End()
defer func() { oc.SetSpanStatus(span, err) }()
dest := context.String("destpath")
if dest == "" {
return errors.New("'destpath' is required")
}
if osversion.Build() < osversion.RS5 {
return errors.New("LCOW is not supported pre-RS5")
}
opts := uvm.NewDefaultOptionsLCOW("preparedisk-uvm", context.GlobalString("owner"))
// Default SCSI controller count is 4, we don't need that for this UVM,
// bring it back to 1 to avoid any confusion with SCSI controller numbers.
opts.SCSIControllerCount = 1
preparediskUVM, err := uvm.CreateLCOW(ctx, opts)
if err != nil {
return errors.Wrapf(err, "failed to create '%s'", opts.ID)
}
defer preparediskUVM.Close()
if err := preparediskUVM.Start(ctx); err != nil {
return errors.Wrapf(err, "failed to start '%s'", opts.ID)
}
if err := lcow.FormatDisk(ctx, preparediskUVM, dest); err != nil {
return errors.Wrapf(err, "failed to format disk '%s' with ext4", opts.ID)
}
return nil
},
}