prepare-disk.go

Documentation: github.com/Microsoft/hcsshim/cmd/runhcs

     1  //go:build windows
     2  
     3  package main
     4  
     5  import (
     6  	gcontext "context"
     7  
     8  	"github.com/Microsoft/hcsshim/internal/appargs"
     9  	"github.com/Microsoft/hcsshim/internal/lcow"
    10  	"github.com/Microsoft/hcsshim/internal/oc"
    11  	"github.com/Microsoft/hcsshim/internal/uvm"
    12  	"github.com/Microsoft/hcsshim/osversion"
    13  	"github.com/pkg/errors"
    14  	"github.com/urfave/cli"
    15  )
    16  
    17  const (
    18  	// prepareDiskStr string used to name the command and identity in the logs
    19  	prepareDiskStr = "prepare-disk"
    20  )
    21  
    22  var prepareDiskCommand = cli.Command{
    23  	Name:        prepareDiskStr,
    24  	Usage:       "format a disk with ext4",
    25  	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').",
    26  	Flags: []cli.Flag{
    27  		cli.StringFlag{
    28  			Name:  "destpath",
    29  			Usage: "Required: describes the destination disk path",
    30  		},
    31  	},
    32  	Before: appargs.Validate(),
    33  	Action: func(context *cli.Context) (err error) {
    34  		ctx, span := oc.StartSpan(gcontext.Background(), prepareDiskStr)
    35  		defer span.End()
    36  		defer func() { oc.SetSpanStatus(span, err) }()
    37  
    38  		dest := context.String("destpath")
    39  		if dest == "" {
    40  			return errors.New("'destpath' is required")
    41  		}
    42  
    43  		if osversion.Build() < osversion.RS5 {
    44  			return errors.New("LCOW is not supported pre-RS5")
    45  		}
    46  
    47  		opts := uvm.NewDefaultOptionsLCOW("preparedisk-uvm", context.GlobalString("owner"))
    48  		// Default SCSI controller count is 4, we don't need that for this UVM,
    49  		// bring it back to 1 to avoid any confusion with SCSI controller numbers.
    50  		opts.SCSIControllerCount = 1
    51  
    52  		preparediskUVM, err := uvm.CreateLCOW(ctx, opts)
    53  		if err != nil {
    54  			return errors.Wrapf(err, "failed to create '%s'", opts.ID)
    55  		}
    56  		defer preparediskUVM.Close()
    57  		if err := preparediskUVM.Start(ctx); err != nil {
    58  			return errors.Wrapf(err, "failed to start '%s'", opts.ID)
    59  		}
    60  		if err := lcow.FormatDisk(ctx, preparediskUVM, dest); err != nil {
    61  			return errors.Wrapf(err, "failed to format disk '%s' with ext4", opts.ID)
    62  		}
    63  
    64  		return nil
    65  	},
    66  }
    67
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