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annotate sbin/fzfs @ 276:3c24b07240f2

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Move the implementation of "mount" and "umount" into the new tool fzfs. It is not jail-specific but in reality a helper for some ZFS management issues.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 17 Sep 2022 16:47:32 +0200
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children 1fc3b04b39fa
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3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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1 #!/bin/sh
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2 # -*- indent-tabs-mode: nil; -*-
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3 #:
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4 #: A ZFS management helper tool.
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5 #:
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6 #: :Author: Franz Glasner
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7 #: :Copyright: (c) 2022 Franz Glasner.
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8 #: All rights reserved.
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9 #: :License: BSD 3-Clause "New" or "Revised" License.
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10 #: See LICENSE for details.
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11 #: If you cannot find LICENSE see
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12 #: <https://opensource.org/licenses/BSD-3-Clause>
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13 #: :ID: @(#)@@PKGORIGIN@@ $HGid$
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14 #:
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15
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16 set -eu
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17
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18 VERSION="@@VERSION@@"
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19
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20 USAGE='
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21 USAGE: fzfs [ OPTIONS ] COMMAND [ COMMAND OPTIONS ] [ ARG ... ]
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22
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23 OPTIONS:
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24
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25 -V Print the program name and version number to stdout and exit
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26
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27 -h Print this help message to stdout and exit
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28
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29 COMMANDS:
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30
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31 mount [-O] [-u] [-n] DATASET [MOUNTPOINT]
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32
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33 Mount the ZFS dataset DATASET and all its children to mountpoint
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34 MOUNTPOINT
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35
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36 -O Also mount datasets at mountpoints outside of their "natural"
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37 and inherited mountpoints
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38 -N Mount at their "natural" configured ZFS mountpoints
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39 (MOUNTPOINT is not required)
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40 -P Do not mount the given parent DATASET but only its children
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41 -n Do not really mount but show what would be mounted where
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42 -u Alias of -n
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43
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44 umount DATASET
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45
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46 Unmount the mounted DATASET and all its children
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47
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48 unmount
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49
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50 Alias for `umount'"'"'
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51
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52 '
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53
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54 #
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55 #: Implementation of the "mount" command.
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56 #:
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57 #: Mount a dataset and recursively all its children datasets.
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58 #:
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59 command_mount() {
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60 local _dsname _mountpoint
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61 local _opt_dry_run _opt_mount_outside _opt_mount_natural
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62 local _opt_mount_children_only
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63
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64 local _name _mp _canmount _mounted _rootds_mountpoint _relative_mp _real_mp
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65
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66 _opt_dry_run=""
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67 _opt_mount_outside=""
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68 _opt_mount_natural=""
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69 _opt_mount_children_only=""
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70 while getopts "ONPnu" _opt ; do
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71 case ${_opt} in
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72 O)
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73 _opt_mount_outside="yes"
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74 ;;
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75 N)
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76 _opt_mount_natural="yes"
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77 ;;
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78 P)
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79 _opt_mount_children_only="yes"
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80 ;;
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81 n|u)
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82 _opt_dry_run="yes"
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83 ;;
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84 \?|:)
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85 return 2;
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86 ;;
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87 esac
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88 done
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89 shift $((OPTIND-1))
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90 OPTIND=1
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91
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92 _dsname="${1-}"
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93 _mountpoint="${2-}"
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94
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95 if [ -z "${_dsname}" ]; then
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96 echo "ERROR: no dataset given" >&2
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97 return 2
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98 fi
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99
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100 _rootds_mountpoint="$(zfs list -H -o mountpoint -t filesystem "${_dsname}")" || \
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101 { echo "ERROR: root dataset does not exist" >&2; return 1; }
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102
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103 if [ -z "${_mountpoint}" ]; then
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104 if [ "${_opt_mount_natural}" = "yes" ]; then
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105 _mountpoint="${_rootds_mountpoint}"
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106 else
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107 echo "ERROR: no mountpoint given" >&2
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108 return 2
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109 fi
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110 else
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111 if [ "${_opt_mount_natural}" = "yes" ]; then
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112 echo "ERROR: Cannot have a custom mountpoint when \"-O\" is given" >&2
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113 return 2
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114 fi
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115 fi
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116
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117 # Eventually remove a trailing slash
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118 _mountpoint="${_mountpoint%/}"
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119 if [ -z "${_mountpoint}" ]; then
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120 echo "ERROR: would mount over the root filesystem" >&2
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121 return 1
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diff changeset
122 fi
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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diff changeset
123
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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diff changeset
124 zfs list -H -o name,mountpoint,canmount,mounted -s mountpoint -t filesystem -r "${_dsname}" \
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125 | {
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126 while IFS=$'\t' read -r _name _mp _canmount _mounted ; do
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127 # Skip filesystems that are already mounted
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128 [ "${_mounted}" = "yes" ] && continue
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129 # Skip filesystems that must not be mounted
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130 [ "${_canmount}" = "off" ] && continue
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131 #
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132 # Mount only the children and skip the given parent dataset
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133 # if required
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134 #
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135 [ \( "${_opt_mount_children_only}" = "yes" \) -a \( "${_name}" = "${_dsname}" \) ] && continue
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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diff changeset
136 case "${_mp}" in
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137 "none"|"legacy")
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138 # Do nothing for filesystem with unset or legacy mountpoints
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139 ;;
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140 "${_rootds_mountpoint}"|"${_rootds_mountpoint}/"*)
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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141 #
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142 # Handle only mountpoints that have a mountpoint below
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143 # the parent datasets mountpoint
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144 #
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145
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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146 # Determine the mountpoint relative to the parent mountpoint
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147 _relative_mp="${_mp#${_rootds_mountpoint}}"
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148 # Eventually remove a trailing slash
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149 _relative_mp="${_relative_mp%/}"
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150 # The real effective full mountpoint
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151 _real_mp="${_mountpoint}${_relative_mp}"
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152
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153 #
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154 # Consistency and sanity check: computed real mountpoint must
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155 # be equal to the configured mountpoint when no custom mountpoint
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156 # is given.
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157 #
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diff changeset
158 if [ "${_opt_mount_natural}" = "yes" ]; then
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diff changeset
159 if [ "${_real_mp}" != "${_mp}" ]; then
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160 echo "ERROR: mountpoint mismatch" >&2
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161 return 1
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162 fi
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163 fi
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164
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165 if [ "${_opt_dry_run}" = "yes" ]; then
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166 echo "Would mount ${_name} on ${_real_mp}"
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167 else
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168 mkdir -p "${_real_mp}" 1> /dev/null 2> /dev/null || \
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169 { echo "ERROR: cannot create mountpoint ${_real_mp}" >&2; return 1; }
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170 echo "Mounting ${_name} on ${_real_mp}"
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171 mount -t zfs "${_name}" "${_real_mp}" || return 1
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172 fi
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173 ;;
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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174 *)
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175 if [ "${_opt_mount_outside}" = "yes" ]; then
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176 if [ "${_opt_dry_run}" = "yes" ]; then
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177 echo "Would mount ${_name} on configured ZFS dataset mountpoint ${_mp}"
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178 else
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179 echo "Mounting ${_name} on configured ZFS dataset mountpoint ${_mp}"
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180 zfs mount "${_name}" || return 1
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181 fi
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182 else
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183 echo "Skipping ${_name} because its configured ZFS mountpoint is not relative to given root dataset" 2>&1
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184 fi
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185 ;;
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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186 esac
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diff changeset
187 done
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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188
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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189 return 0
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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190 }
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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diff changeset
191 }
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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parents:
diff changeset
192
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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parents:
diff changeset
193
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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194 #:
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195 #: Implement the "umount" command.
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196 #:
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197 #: Umount a datasets and recursively all its children datasets.
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198 #:
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diff changeset
199 command_umount() {
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diff changeset
200 local _dsname
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diff changeset
201
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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diff changeset
202 local _name _mp _rest _rootds_mountpoint
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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parents:
diff changeset
203
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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parents:
diff changeset
204 _dsname="${1-}"
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diff changeset
205 [ -z "${_dsname}" ] && { echo "ERROR: no dataset given" 1>&2; return 2; }
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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diff changeset
206
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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parents:
diff changeset
207 # Just determine whether the given dataset name exists
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diff changeset
208 _rootds_mountpoint="$(zfs list -H -o mountpoint -t filesystem "${_dsname}")" || { echo "ERROR: dataset not found" 1>&2; return 1; }
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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parents:
diff changeset
209
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
210 mount -t zfs -p \
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
211 | grep -E "^${_dsname}(/|\s)" \
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
212 | sort -n -r \
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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parents:
diff changeset
213 | {
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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parents:
diff changeset
214 while IFS=' '$'\t' read -r _name _mp _rest ; do
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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parents:
diff changeset
215 echo "Umounting ${_name} on ${_mp}"
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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parents:
diff changeset
216 umount "${_mp}" || return 1
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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parents:
diff changeset
217 done
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
218 }
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
219 return 0
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
220 }
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
221
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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parents:
diff changeset
222 #
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parents:
diff changeset
223 # Global option handling
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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parents:
diff changeset
224 #
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parents:
diff changeset
225 while getopts "Vh" _opt ; do
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
226 case ${_opt} in
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
227 V)
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
228 printf 'ftjail v%s (rv:%s)\n' "${VERSION}" '@@HGREVISION@@'
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
229 exit 0
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
230 ;;
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
231 h)
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
232 echo "${USAGE}"
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
233 exit 0
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
234 ;;
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235 \?)
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236 exit 2;
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237 ;;
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238 *)
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239 echo "ERROR: option handling failed" 1>&2
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240 exit 2
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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241 ;;
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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242 esac
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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243 done
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244 #
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245 # Reset the Shell's option handling system to prepare for handling
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246 # command-local options.
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247 #
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248 shift $((OPTIND-1))
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249 OPTIND=1
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250
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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251 test $# -gt 0 || { echo "ERROR: no command given" 1>&2; exit 2; }
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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252
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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253 command="$1"
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254 shift
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255
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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256 case "${command}" in
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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257 mount)
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258 command_mount "$@"
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259 ;;
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260 umount|unmount)
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261 command_umount "$@"
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262 ;;
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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263 *)
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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264 echo "ERROR: unknown command \`${command}'" 1>&2
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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265 exit 2
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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266 ;;
3c24b07240f2 Move the implementation of "mount" and "umount" into the new tool fzfs.
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267 esac