github.com/stolowski/snapd@v0.0.0-20210407085831-115137ce5a22/osutil/bootid.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2017 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package osutil
    21  
    22  import (
    23  	"io/ioutil"
    24  	"os"
    25  	"strings"
    26  )
    27  
    28  // BootID returns the unique system-generated boot identifier.
    29  func BootID() (string, error) {
    30  	file, err := os.Open("/proc/sys/kernel/random/boot_id")
    31  	if err != nil {
    32  		return "", err
    33  	}
    34  	defer file.Close()
    35  	bytes, err := ioutil.ReadAll(file)
    36  	if err != nil {
    37  		return "", err
    38  	}
    39  	return strings.TrimSpace(string(bytes)), nil
    40  }