Mercurial > hgrepos > FreeBSD > ports > sysutils > local-bsdtools
annotate sbin/fjail @ 208:0136dce2db22
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| author | Franz Glasner <fzglas.hg@dom66.de> |
|---|---|
| date | Sun, 21 Aug 2022 15:12:59 +0200 |
| parents | a19acddb4662 |
| children | 1b176ccd41b9 |
| rev | line source |
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1 #!/bin/sh |
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2 # -*- indent-tabs-mode: nil; -*- |
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3 : 'A very minimal BSD Jail management tool. |
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4 |
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5 :Author: Franz Glasner |
| 193 | 6 :Copyright: (c) 2019-2022 Franz Glasner. |
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7 All rights reserved. |
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8 :License: BSD 3-Clause "New" or "Revised" License. |
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9 See LICENSE for details. |
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10 If you cannot find LICENSE see |
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11 <https://opensource.org/licenses/BSD-3-Clause> |
| 93 | 12 :ID: @(#)@@PKGORIGIN@@ $HGid$ |
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13 |
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14 ' |
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15 |
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16 set -eu |
| 73 | 17 |
| 18 VERSION="@@VERSION@@" | |
| 19 | |
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20 USAGE=' |
| 75 | 21 USAGE: fjail [ OPTIONS ] COMMAND [ COMMAND OPTIONS ] [ ARG ... ] |
| 22 | |
| 23 OPTIONS: | |
| 24 | |
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25 -V Print the program name and version number to stdout and exit |
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26 |
| 75 | 27 -h Print this help message to stdout and exit |
| 28 | |
| 29 COMMANDS: | |
| 30 | |
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31 datasets [OPTIONS] PARENT CHILD |
| 75 | 32 |
| 33 Create ZFS datasets to be used within a jail | |
| 34 | |
| 35 PARENT must exist already and CHILD must not exist. | |
| 36 | |
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37 -A Set "canmount=auto" for datasets |
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38 -s Also create a dataset for freebsd-update data files |
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39 -t Create a more tiny set of datasets |
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40 -T Create only an extra tiny set of datasets |
| 75 | 41 -u Do not automatically mount newly created datasets |
| 42 | |
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43 mount [-O] [-u] [-n] DATASET [MOUNTPOINT] |
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44 |
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45 Mount the ZFS dataset DATASET and all its children to mountpoint |
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46 MOUNTPOINT |
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47 |
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48 -O Also mount datasets at mountpoints outside of their "natural" |
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49 and inherited mountpoints |
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50 -N Mount at their "natural" configured ZFS mountpoints (MOUNTPOINT is not required) |
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51 -n Do not really mount but show what would be mounted where |
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52 -u Alias of -n |
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53 |
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54 umount DATASET |
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55 |
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56 Unmount the mounted DATASET and all its children |
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57 |
| 75 | 58 privs MOUNTPOINT |
| 59 | |
| 60 Adjust some Unix privileges to mounted jail datasets | |
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61 |
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62 populate MOUNTPOINT BASETXZ |
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63 |
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64 Populate the jail directory in MOUNTPOINT with the base system in BASETXZ |
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65 |
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66 copy [OPTIONS] SOURCE-DATASET DEST-DATASET |
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67 |
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68 Copy a tree of ZFS datasets with "zfs send -R" and "zfs receive". |
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69 Note that the destination dataset must not exist already. |
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70 |
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71 -r Copy the datasets with the -Lec options (aka "raw") |
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72 -u Do not automatically mount received datasets |
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73 |
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74 ENVIRONMENT: |
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75 |
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76 All environment variables that affect "zfs" are effective also. |
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77 |
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78 DESCRIPTION: |
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79 |
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80 All commands with the exception of "populate" require ZFS as |
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81 filesystem. |
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82 ' |
| 75 | 83 |
| 84 | |
| 73 | 85 # Reset to standard umask |
| 86 umask 0022 | |
| 87 | |
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88 |
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89 _get_dataset_for_mountpoint() { |
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90 : 'Use `mount -t zfs -p` to determine the ZFS dataset for a given mountpoint. |
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91 |
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92 ' |
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93 local _mountpoint |
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94 local _ds _mount _rest |
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95 |
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96 _mountpoint="$1" |
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97 |
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98 mount -t zfs -p \ |
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99 | { |
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100 while IFS=' '$'\t' read -r _ds _mount _rest ; do |
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101 if [ "$_mount" = "$_mountpoint" ]; then |
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102 echo "${_ds}" |
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103 return 0 |
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104 fi |
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105 done |
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106 return 1 |
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107 } |
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108 } |
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109 |
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110 |
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111 _get_dataset_for_varempty() { |
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112 : 'Allow special handling for <mountpoint>/var/empty which may be |
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113 mounted read-only. |
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114 |
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115 ' |
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116 local _mountpoint |
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117 local _ve_mount |
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118 |
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119 _mountpoint="$1" |
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120 |
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121 if [ "$_mountpoint" = '/' ]; then |
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122 _ve_mount='/var/empty' |
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123 else |
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124 _ve_mount="${_mountpoint}/var/empty" |
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125 fi |
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126 |
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127 _get_dataset_for_mountpoint "${_ve_mount}" |
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128 } |
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129 |
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130 |
| 73 | 131 # |
| 132 # "datasets" -- create the ZFS dataset tree | |
| 133 # | |
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134 # command_datasets [ -u ] parent-dataset child-dataset |
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135 # |
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136 # -u do not automatically mount newly created datasets |
| 73 | 137 # |
| 138 command_datasets() { | |
| 139 # parent ZFS dataset -- child ZFS dataset name | |
| 140 local _pds _cds | |
| 141 # and its mount point | |
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142 local _pmp _get |
| 73 | 143 # full name of the dataset |
| 144 local _ds | |
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145 # dynamic ZFS options -- create cache for freebsd-update -- use a more tiny layout |
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146 local _zfsopts _fbsdupdate _tiny _zfsnoauto |
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147 |
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148 _zfsopts="" |
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149 _fbsdupdate="" |
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150 _tiny="no" |
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151 _zfsnoauto="" |
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152 while getopts "ustAT" _opt ; do |
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153 case ${_opt} in |
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154 A) |
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155 # |
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156 # set canmount=noauto where otherwise canmount=on would have been set |
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157 # or inherited |
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158 # |
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159 _zfsnoauto="-o canmount=noauto" |
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160 ;; |
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161 t) |
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162 # use a more tiny layout |
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163 _tiny="yes" |
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164 ;; |
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165 T) # extra tiny layout |
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166 _tiny="extra" |
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167 ;; |
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168 u) |
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169 # do not mount newly created datasets |
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170 _zfsopts="${_zfsopts} -u" |
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171 ;; |
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172 s) |
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173 # create also a dataset for freebsd-update data |
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174 _fbsdupdate="yes" |
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179
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175 ;; |
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176 \?|:) |
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177 return 2; |
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178 ;; |
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179 esac |
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180 done |
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181 shift $((OPTIND-1)) |
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182 OPTIND=1 |
| 73 | 183 |
| 184 _pds="$1" | |
| 185 if [ -z "${_pds}" ]; then | |
| 186 echo "ERROR: no parent dataset given" >&2 | |
| 187 return 2 | |
| 188 fi | |
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189 _pmp=$(zfs list -H -o mountpoint -t filesystem "${_pds}" 2>/dev/null) || { echo "ERROR: dataset \`${_pds}' does not exist" >&2; return 1; } |
| 73 | 190 case "${_pmp}" in |
| 191 none) | |
| 192 echo "ERROR: dataset \`${_pds}' has no mountpoint" >&2 | |
| 193 return 1 | |
| 194 ;; | |
| 195 legacy) | |
| 196 echo "ERROR: dataset \`${_pds}' has a \`${_mp}' mountpoint" >&2 | |
| 197 return 1 | |
| 198 ;; | |
| 199 *) | |
| 200 # VOID | |
| 201 ;; | |
| 202 esac | |
| 203 _cds="$2" | |
| 204 if [ -z "${_cds}" ]; then | |
| 205 echo "ERROR: no child dataset given" >&2 | |
| 206 return 2 | |
| 207 fi | |
| 208 _ds="${_pds}/${_cds}" | |
| 209 echo "Resulting new root dataset is \`${_ds}' at mountpoint \`${_pmp}/${_cds}'" | |
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210 if zfs list -H -o mountpoint -t filesystem "${_ds}" >/dev/null 2>/dev/null; then |
| 73 | 211 echo "ERROR: dataset \`${_ds}' does already exist" >&2 |
| 212 return 1 | |
| 213 fi | |
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214 |
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215 # |
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216 # NOTE: For BEs these directory will be *excluded* from the BE |
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217 # |
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218 # /tmp |
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219 # /usr/home |
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220 # /usr/ports |
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221 # /usr/src |
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222 # /var/audit |
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223 # /var/crash |
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224 # /var/log |
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225 # /var/mail |
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226 # /var/tmp |
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227 # |
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228 zfs create ${_zfsopts} ${_zfsnoauto} -o atime=off "${_ds}" |
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229 zfs create ${_zfsopts} ${_zfsnoauto} -o sync=disabled -o setuid=off "${_ds}/tmp" |
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230 if [ "${_tiny}" != "extra" ]; then |
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231 if [ "${_tiny}" = "yes" ]; then |
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232 zfs create ${_zfsopts} -o canmount=off "${_ds}/usr" |
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233 else |
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234 zfs create ${_zfsopts} ${_zfsnoauto} "${_ds}/usr" |
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235 fi |
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236 zfs create ${_zfsopts} ${_zfsnoauto} -o setuid=off "${_ds}/usr/home" |
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237 zfs create ${_zfsopts} ${_zfsnoauto} "${_ds}/usr/local" |
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238 fi |
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239 if [ \( "${_tiny}" = "yes" \) -o \( "${_tiny}" = "extra" \) ]; then |
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240 zfs create ${_zfsopts} -o canmount=off "${_ds}/var" |
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241 else |
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242 zfs create ${_zfsopts} ${_zfsnoauto} "${_ds}/var" |
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243 fi |
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244 if [ "${_tiny}" != "extra" ]; then |
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245 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off "${_ds}/var/audit" |
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246 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off "${_ds}/var/cache" |
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247 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off -o primarycache=metadata -o compression=off "${_ds}/var/cache/pkg" |
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248 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off -o compression=off "${_ds}/var/crash" |
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249 fi |
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250 if [ "$_fbsdupdate" = "yes" ]; then |
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251 if [ \( "${_tiny}" = "yes" \) -o \( "${_tiny}" = "extra" \) ]; then |
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252 zfs create ${_zfsopts} -o canmount=off -o exec=off -o setuid=off "${_ds}/var/db" |
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253 else |
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254 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off "${_ds}/var/db" |
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255 fi |
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256 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off -o primarycache=metadata -o compression=off "${_ds}/var/db/freebsd-update" |
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177
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257 fi |
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258 zfs create ${_zfsopts} ${_zfsnoauto} -o readonly=on -o exec=off -o setuid=off "${_ds}/var/empty" |
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259 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off -o primarycache=metadata "${_ds}/var/log" |
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260 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off -o atime=on "${_ds}/var/mail" |
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261 zfs create ${_zfsopts} ${_zfsnoauto} -o sync=disabled -o exec=off -o setuid=off -o compression=off -o primarycache=all "${_ds}/var/run" |
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262 zfs create ${_zfsopts} ${_zfsnoauto} -o sync=disabled -o setuid=off "${_ds}/var/tmp" |
| 73 | 263 } |
| 264 | |
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265 |
| 73 | 266 # |
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267 # "populate" -- populate the datasets with content from a FreeBSD base.txz |
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268 # |
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269 # command_populate mountpoint basetxz |
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270 # |
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271 command_populate() { |
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272 # MOUNTPOINT -- base.txz |
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273 local _mp _basetxz |
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274 |
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275 _mp="$1" |
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276 _basetxz="$2" |
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277 |
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278 if [ -z "${_mp}" ]; then |
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279 echo "ERROR: no mountpoint given" >&2 |
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280 return 2 |
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281 fi |
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282 if [ -z "${_basetxz}" ]; then |
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283 echo "ERROR: no base.txz given" >&2 |
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284 return 2 |
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285 fi |
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286 if [ ! -d "${_mp}" ]; then |
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287 echo "ERROR: mountpoint \`${_mp}' does not exist" >&2 |
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288 return 1 |
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289 fi |
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290 if [ ! -r "${_basetxz}" ]; then |
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291 echo "ERROR: file \`${_basetxz}' is not readable" >&2 |
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292 return 1 |
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293 fi |
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294 |
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295 # |
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296 # Handle /var/empty separately later: could be already there and |
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297 # mounted read-only. |
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298 # |
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299 tar -C "${_mp}" --exclude=./var/empty -xJp -f "${_basetxz}" || { echo "ERROR: tar encountered errors" >&2; return 1; } |
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300 if [ -d "${_mp}/var/empty" ]; then |
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301 # |
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302 # If /var/empty exists already try to extract with changing the |
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303 # flags (e.g. `schg'). But be ignore errors here. |
|
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304 # |
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305 tar -C "${_mp}" -xJp -f "${_basetxz}" ./var/empty || { echo "tar warnings for handling ./var/empty ignored because ./var/empty exists already" >&2; } |
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306 else |
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307 # Just extract /var/empty normally |
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308 tar -C "${_mp}" -xJp -f "${_basetxz}" ./var/empty || { echo "ERROR: tar encountered errors" >&2; return 1; } |
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309 fi |
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310 |
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311 find "${_mp}/boot" -type f -delete |
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312 } |
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313 |
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314 |
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315 # |
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316 # "copy" -- ZFS copy of datasets |
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317 # |
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318 # command_copy source-dataset destination-dataset |
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319 # |
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320 command_copy() { |
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321 # source dataset -- destination dataset |
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322 local _source _dest |
|
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323 # dynamic ZFS options -- ZFS copy options |
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324 local _zfsopts _zfscopyopts |
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325 |
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326 _zfsopts="" |
|
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327 _zfscopyopts="" |
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328 while getopts "ru" _opt ; do |
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329 case ${_opt} in |
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330 r) |
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331 # Use raw datasets |
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332 _zfscopyopts="-Lec" |
|
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333 ;; |
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334 u) |
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335 # do not mount newly created datasets |
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336 _zfsopts="${_zfsopts} -u" |
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337 ;; |
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338 \?|:) |
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339 return 2; |
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340 ;; |
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341 esac |
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342 done |
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343 shift $((OPTIND-1)) |
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344 OPTIND=1 |
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345 |
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346 _source="$1" |
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347 if [ -z "${_source}" ]; then |
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348 echo "ERROR: no source dataset given" >&2 |
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349 return 2 |
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350 fi |
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351 _dest="$2" |
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352 if [ -z "${_dest}" ]; then |
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353 echo "ERROR: no source dataset given" >&2 |
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354 return 2 |
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355 fi |
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356 zfs send -R ${_zfscopyopts} -n -v "${_source}" || { echo "ERROR: ZFS operation failed in no-op mode" >&2; return 1; } |
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357 zfs send -R ${_zfscopyopts} "${_source}" | zfs receive ${_zfsopts} "${_dest}" || { echo "ERROR: ZFS operation failed" >&2; return 1; } |
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358 } |
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359 |
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360 |
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361 # |
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362 # "mount" -- recursively mount a dataset including subordinate datasets |
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363 # |
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364 # command_mount dataset mountpoint |
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365 # |
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366 command_mount() { |
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367 local _dsname _mountpoint |
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368 local _name _mp _canmount _mounted |
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369 local _rootds_mountpoint _relative_mp _real_mp |
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370 local _dry_run _mount_outside _mount_natural |
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371 |
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372 _dry_run="" |
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373 _mount_outside="" |
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374 _mount_natural="" |
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375 while getopts "ONnu" _opt ; do |
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376 case ${_opt} in |
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377 O) |
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378 _mount_outside="yes" |
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379 ;; |
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380 N) |
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381 _mount_natural="yes" |
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382 ;; |
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383 n|u) |
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384 _dry_run="yes" |
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385 ;; |
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386 \?|:) |
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387 return 2; |
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388 ;; |
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389 esac |
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390 done |
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391 shift $((OPTIND-1)) |
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392 OPTIND=1 |
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393 |
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394 _dsname="${1-}" |
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395 _mountpoint="${2-}" |
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396 |
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397 if [ -z "${_dsname}" ]; then |
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398 echo "ERROR: no dataset given" >&2 |
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399 return 2 |
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400 fi |
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401 |
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402 _rootds_mountpoint="$(zfs list -H -o mountpoint -t filesystem "${_dsname}")" || \ |
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403 { echo "ERROR: root dataset does not exist" >&2; return 1; } |
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404 |
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405 if [ -z "${_mountpoint}" ]; then |
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406 if [ "${_mount_natural}" = "yes" ]; then |
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407 _mountpoint="${_rootds_mountpoint}" |
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408 else |
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409 echo "ERROR: no mountpoint given" >&2 |
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410 return 2 |
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411 fi |
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412 else |
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413 if [ "${_mount_natural}" = "yes" ]; then |
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414 echo "ERROR: Cannot have a custom mountpoint when \"-O\" is given" >&2 |
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415 return 2 |
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416 fi |
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417 fi |
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418 |
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419 # Eventually remove a trailing slash |
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420 _mountpoint="${_mountpoint%/}" |
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421 if [ -z "${_mountpoint}" ]; then |
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422 echo "ERROR: would mount over the root filesystem" >&2 |
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423 return 1 |
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424 fi |
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425 |
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201
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426 zfs list -H -o name,mountpoint,canmount,mounted -s mountpoint -t filesystem -r "${_dsname}" \ |
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427 | { |
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428 while IFS=$'\t' read -r _name _mp _canmount _mounted ; do |
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429 # Skip filesystems that are already mounted |
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430 [ "${_mounted}" = "yes" ] && continue |
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431 # Skip filesystems that must not be mounted |
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432 [ "${_canmount}" = "off" ] && continue |
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433 case "${_mp}" in |
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434 "none"|"legacy") |
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435 # Do nothing for filesystem with unset or legacy mountpoints |
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436 ;; |
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437 "${_rootds_mountpoint}"|"${_rootds_mountpoint}/"*) |
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438 # |
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439 # Handle only mountpoints that have a mountpoint below |
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440 # the parent datasets mountpoint |
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441 # |
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442 |
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443 # Determine the mountpoint relative to the parent mountpoint |
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444 _relative_mp="${_mp#${_rootds_mountpoint}}" |
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445 # Remove a trailing slash |
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446 _relative_mp="${_relative_mp%/}" |
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447 _real_mp="${_mountpoint}${_relative_mp}" |
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448 if [ "${_dry_run}" = "yes" ]; then |
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449 echo "Would mount ${_name} on ${_real_mp}" |
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450 else |
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451 mkdir -p "${_real_mp}" 1> /dev/null 2> /dev/null || \ |
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452 { echo "ERROR: cannot create mountpoint ${_real_mp}" >&2; return 1; } |
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453 echo "Mounting ${_name} on ${_real_mp}" |
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454 mount -t zfs "${_name}" "${_real_mp}" || return 1 |
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455 fi |
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456 ;; |
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457 *) |
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458 if [ "${_mount_outside}" = "yes" ]; then |
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459 if [ "${_dry_run}" = "yes" ]; then |
| 208 | 460 echo "Would mount ${_name} on configured ZFS dataset mountpoint ${_mp}" |
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461 else |
| 208 | 462 echo "Mounting ${_name} on configured ZFS dataset mountpoint ${_mp}" |
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463 zfs mount "${_name}" || return 1 |
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464 fi |
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465 else |
| 208 | 466 echo "Skipping ${_name} because its configured ZFS mountpoint is not relative to given root dataset" 2>&1 |
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467 fi |
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468 ;; |
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469 esac |
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470 done |
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471 |
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472 return 0 |
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473 } |
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474 } |
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475 |
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476 |
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477 # |
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478 # "umount" -- Recursively unmount ZFS datasets |
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479 # |
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480 # command_umount dataset |
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481 # |
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482 command_umount() { |
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483 local _dsname |
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484 local _name _mp _rest |
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485 local _rootds_mountpoint |
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486 |
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487 _dsname="${1-}" |
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488 [ -z "${_dsname}" ] && \ |
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489 { echo "ERROR: no dataset given" >&2; return 2; } |
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490 |
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491 # Just determine whether the given dataset name exists |
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492 _rootds_mountpoint="$(zfs list -H -o mountpoint -t filesystem "${_dsname}")" || { echo "ERROR: dataset not found" >&2; return 1; } |
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493 |
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494 mount -t zfs -p \ |
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495 | grep -E "^${_dsname}(/|\s)" \ |
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496 | sort -n -r \ |
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497 | { |
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498 while IFS=' '$'\t' read -r _name _mp _rest ; do |
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499 echo "Umounting ${_name} on ${_mp}" |
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500 umount "${_mp}" || return 1 |
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501 done |
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502 return 0 |
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503 } |
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504 } |
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505 |
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506 |
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507 # |
| 73 | 508 # "privs" -- adjust privileges |
| 509 # | |
| 510 # To be used when all ZFS datasets are mounted. | |
| 511 # | |
| 512 command_privs() { | |
| 513 # mountpoint | |
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514 local _mp _d _veds _get _vestatus |
| 73 | 515 |
| 516 _mp="$1" | |
| 517 if [ -z "${_mp}" ]; then | |
| 518 echo "ERROR: no mountpoint given" >&2 | |
| 519 return 2 | |
| 520 fi | |
| 521 if [ ! -d "${_mp}" ]; then | |
| 522 echo "ERROR: directory \`${_mp}' does not exist" >&2 | |
| 523 return 1 | |
| 524 fi | |
| 525 for _d in tmp var/tmp ; do | |
| 526 chmod 01777 "${_mp}/${_d}" | |
| 527 done | |
| 528 chown root:mail "${_mp}/var/mail" | |
| 529 chmod 0775 "${_mp}/var/mail" | |
|
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530 |
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531 # |
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532 # Handle <mountpoint>/var/empty specially: |
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533 # make it writeable temporarily if it is mounted read-only: |
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534 # |
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535 _vestatus="" |
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536 _veds="$(_get_dataset_for_varempty "${_mp}")" |
|
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537 if [ $? -eq 0 ]; then |
|
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538 _vestatus=$(zfs list -H -o readonly -t filesystem ${_veds} 2>/dev/null) || { echo "ERROR: cannot determine readonly status of ${_mp}/var/empty" >&2; return 1; } |
|
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539 if [ "${_vestatus}" = "on" ]; then |
|
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540 zfs set readonly=off ${_veds} 1> /dev/null || { echo "ERROR: cannot reset readonly-status of ${_mp}/var/empty" >&2; return 1; } |
|
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541 fi |
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542 fi |
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543 # Set the access rights and the file flags as given in mtree |
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544 chmod 0555 "${_mp}/var/empty" || { echo "WARNING: Cannot chmod on var/empty" >&2; } |
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545 chflags schg "${_mp}/var/empty" || { echo "WARNING: Cannot chflags on var/empty" >&2; } |
|
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546 # Reset the read-only status of the mountpoint as it was before |
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547 if [ "${_vestatus}" = "on" ]; then |
|
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548 zfs set readonly=on ${_veds} 1> /dev/null || { echo "ERROR: cannot reactivate readonly-status of ${_mp}/var/empty" >&2; return 1; } |
|
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549 fi |
| 73 | 550 } |
|
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551 |
|
74
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552 |
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553 # |
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554 # Global option handling |
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555 # |
|
81
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556 while getopts "Vh" _opt ; do |
|
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557 case ${_opt} in |
|
81
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558 V) |
|
144
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559 printf 'fjail v%s (rv:%s)\n' "${VERSION}" '@@HGREVISION@@' |
|
81
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560 exit 0 |
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561 ;; |
|
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562 h) |
| 75 | 563 echo "${USAGE}" |
|
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564 exit 0 |
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565 ;; |
|
80
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566 \?) |
|
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567 exit 2; |
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568 ;; |
|
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569 *) |
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570 echo "ERROR: option handling failed" >&2 |
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571 exit 2 |
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572 ;; |
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573 esac |
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574 done |
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575 |
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576 # |
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577 # Reset the Shell's option handling system to prepare for handling |
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578 # command-local options. |
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579 # |
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580 shift $((OPTIND-1)) |
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581 OPTIND=1 |
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582 |
|
92
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583 test $# -gt 0 || { echo "ERROR: no command given" >&2; exit 2; } |
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584 |
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585 command="$1" |
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586 shift |
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587 |
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588 case "${command}" in |
| 73 | 589 datasets) |
| 590 command_datasets "$@" | |
| 591 ;; | |
|
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592 mount) |
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593 command_mount "$@" |
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594 ;; |
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595 umount|unmount) |
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596 command_umount "$@" |
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597 ;; |
| 73 | 598 privs) |
| 599 command_privs "$@" | |
| 600 ;; | |
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601 populate) |
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602 command_populate "$@" |
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603 ;; |
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77
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604 copy) |
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605 command_copy "$@" |
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606 ;; |
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607 *) |
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608 echo "ERROR: unknown command \`${command}'" >&2 |
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609 exit 2 |
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610 ;; |
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611 esac |