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

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2016 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  	"fmt"
    24  	"strings"
    25  )
    26  
    27  // IsHomeUsingNFS returns true if NFS mounts are defined or mounted under /home.
    28  //
    29  // Internally /proc/self/mountinfo and /etc/fstab are interrogated (for current
    30  // and possible mounted filesystems).  If either of those describes NFS
    31  // filesystem mounted under or beneath /home/ then the return value is true.
    32  func IsHomeUsingNFS() (bool, error) {
    33  	mountinfo, err := LoadMountInfo()
    34  	if err != nil {
    35  		return false, fmt.Errorf("cannot parse mountinfo: %s", err)
    36  	}
    37  	for _, entry := range mountinfo {
    38  		if (entry.FsType == "nfs4" || entry.FsType == "nfs" || entry.FsType == "autofs") && (strings.HasPrefix(entry.MountDir, "/home/") || entry.MountDir == "/home") {
    39  			return true, nil
    40  		}
    41  	}
    42  	fstab, err := LoadMountProfile(etcFstab)
    43  	if err != nil {
    44  		return false, fmt.Errorf("cannot parse %s: %s", etcFstab, err)
    45  	}
    46  	for _, entry := range fstab.Entries {
    47  		if (entry.Type == "nfs4" || entry.Type == "nfs") && (strings.HasPrefix(entry.Dir, "/home/") || entry.Dir == "/home") {
    48  			return true, nil
    49  		}
    50  	}
    51  	return false, nil
    52  }