github.com/mysteriumnetwork/node@v0.0.0-20240516044423-365054f76801/ci/util/device/loop.go (about)

     1  /*
     2   * Copyright (C) 2019 The "MysteriumNetwork/node" Authors.
     3   *
     4   * This program is free software: you can redistribute it and/or modify
     5   * it under the terms of the GNU General Public License as published by
     6   * the Free Software Foundation, either version 3 of the License, or
     7   * (at your option) any later version.
     8   *
     9   * This program is distributed in the hope that it will be useful,
    10   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    11   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12   * GNU General Public License for more details.
    13   *
    14   * You should have received a copy of the GNU General Public License
    15   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    16   */
    17  
    18  package device
    19  
    20  import (
    21  	"strings"
    22  
    23  	"github.com/mysteriumnetwork/go-ci/shell"
    24  	"github.com/pkg/errors"
    25  )
    26  
    27  // AttachLoop attaches system image to the first available loop device and returns its name
    28  func AttachLoop(imageFilename string) (loopDevice string, err error) {
    29  	output, err := shell.NewCmdf("sudo /sbin/losetup --show --find --partscan %s", imageFilename).Output()
    30  	if err != nil {
    31  		return "", errors.Wrapf(err, "could not attach image to loop loopDevice, image: %s", imageFilename)
    32  	}
    33  	devices := strings.Split(output, "\n")
    34  	if len(devices) > 0 {
    35  		loopDevice = devices[0]
    36  	}
    37  	if loopDevice == "" {
    38  		return "", errors.New("loop loopDevice not found")
    39  	}
    40  	return loopDevice, nil
    41  }
    42  
    43  // DetachLoop detaches given loop device
    44  func DetachLoop(loopDevice string) error {
    45  	err := shell.NewCmdf("sudo /sbin/losetup -d %s", loopDevice).Run()
    46  	return errors.Wrapf(err, "could not detach image from loop loopDevice %s", loopDevice)
    47  }