Mercurial > hgrepos > FreeBSD > ports > sysutils > local-bsdtools
annotate sbin/fjail @ 204:ef397b84b047
Implement a "-A" flat for dataset creation: set canmount=noauto
| author | Franz Glasner <fzglas.hg@dom66.de> |
|---|---|
| date | Sun, 21 Aug 2022 13:23:10 +0200 |
| parents | eb95c986cc59 |
| children | fcfa674c8444 |
| 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 | |
| 31 datasets [-u] PARENT CHILD | |
| 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 [-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 -n Do not really mount but show what would be mounted where |
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49 -u Alias of -n |
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50 |
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51 umount DATASET |
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52 |
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53 Unmount the mounted DATASET and all its children |
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54 |
| 75 | 55 privs MOUNTPOINT |
| 56 | |
| 57 Adjust some Unix privileges to mounted jail datasets | |
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58 |
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59 populate MOUNTPOINT BASETXZ |
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60 |
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61 Populate the jail directory in MOUNTPOINT with the base system in BASETXZ |
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62 |
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63 copy SOURCE-DATASET DEST-DATASET |
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64 |
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65 Copy a tree of ZFS datasets with "zfs send -R" and "zfs receive". |
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66 Note that the destination dataset must not exist already. |
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67 |
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68 -r Copy the datasets with the -Lec options (aka "raw") |
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69 -u Do not automatically mount received datasets |
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70 |
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71 ENVIRONMENT: |
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72 |
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73 All environment variables that affect "zfs" are effective also. |
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74 |
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75 DESCRIPTION: |
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76 |
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77 All commands with the exception of "populate" require ZFS as |
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78 filesystem. |
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79 ' |
| 75 | 80 |
| 81 | |
| 73 | 82 # Reset to standard umask |
| 83 umask 0022 | |
| 84 | |
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85 |
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86 _get_dataset_for_mountpoint() { |
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87 : 'Use `mount -t zfs -p` to determine the ZFS dataset for a given mountpoint. |
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88 |
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89 ' |
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90 local _mountpoint |
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91 local _ds _mount _rest |
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92 |
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93 _mountpoint="$1" |
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94 |
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95 mount -t zfs -p \ |
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96 | { |
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97 while IFS=' '$'\t' read -r _ds _mount _rest ; do |
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98 if [ "$_mount" = "$_mountpoint" ]; then |
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99 echo "${_ds}" |
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100 return 0 |
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101 fi |
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102 done |
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103 return 1 |
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104 } |
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105 } |
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106 |
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107 |
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108 _get_dataset_for_varempty() { |
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109 : 'Allow special handling for <mountpoint>/var/empty which may be |
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110 mounted read-only. |
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111 |
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112 ' |
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113 local _mountpoint |
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114 local _ve_mount |
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115 |
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116 _mountpoint="$1" |
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117 |
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118 if [ "$_mountpoint" = '/' ]; then |
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119 _ve_mount='/var/empty' |
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120 else |
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121 _ve_mount="${_mountpoint}/var/empty" |
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122 fi |
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123 |
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124 _get_dataset_for_mountpoint "${_ve_mount}" |
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125 } |
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126 |
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127 |
| 73 | 128 # |
| 129 # "datasets" -- create the ZFS dataset tree | |
| 130 # | |
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131 # command_datasets [ -u ] parent-dataset child-dataset |
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132 # |
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133 # -u do not automatically mount newly created datasets |
| 73 | 134 # |
| 135 command_datasets() { | |
| 136 # parent ZFS dataset -- child ZFS dataset name | |
| 137 local _pds _cds | |
| 138 # and its mount point | |
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139 local _pmp _get |
| 73 | 140 # full name of the dataset |
| 141 local _ds | |
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142 # dynamic ZFS options -- create cache for freebsd-update -- use a more tiny layout |
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143 local _zfsopts _fbsdupdate _tiny _zfsnoauto |
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144 |
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145 _zfsopts="" |
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146 _fbsdupdate="" |
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147 _tiny="no" |
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148 _zfsnoauto="" |
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149 while getopts "ustAT" _opt ; do |
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150 case ${_opt} in |
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151 A) |
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152 # |
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153 # set canmount=noauto where otherwise canmount=on would have been set |
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154 # or inherited |
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155 # |
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156 _zfsnoauto="-o canmount=noauto" |
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157 ;; |
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158 t) |
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159 # use a more tiny layout |
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160 _tiny="yes" |
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161 ;; |
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162 T) # extra tiny layout |
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163 _tiny="extra" |
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164 ;; |
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165 u) |
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166 # do not mount newly created datasets |
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167 _zfsopts="${_zfsopts} -u" |
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168 ;; |
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169 s) |
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170 # create also a dataset for freebsd-update data |
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171 _fbsdupdate="yes" |
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179
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172 ;; |
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173 \?|:) |
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174 return 2; |
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175 ;; |
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176 esac |
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177 done |
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178 shift $((OPTIND-1)) |
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179 OPTIND=1 |
| 73 | 180 |
| 181 _pds="$1" | |
| 182 if [ -z "${_pds}" ]; then | |
| 183 echo "ERROR: no parent dataset given" >&2 | |
| 184 return 2 | |
| 185 fi | |
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186 _pmp=$(zfs list -H -o mountpoint -t filesystem "${_pds}" 2>/dev/null) || { echo "ERROR: dataset \`${_pds}' does not exist" >&2; return 1; } |
| 73 | 187 case "${_pmp}" in |
| 188 none) | |
| 189 echo "ERROR: dataset \`${_pds}' has no mountpoint" >&2 | |
| 190 return 1 | |
| 191 ;; | |
| 192 legacy) | |
| 193 echo "ERROR: dataset \`${_pds}' has a \`${_mp}' mountpoint" >&2 | |
| 194 return 1 | |
| 195 ;; | |
| 196 *) | |
| 197 # VOID | |
| 198 ;; | |
| 199 esac | |
| 200 _cds="$2" | |
| 201 if [ -z "${_cds}" ]; then | |
| 202 echo "ERROR: no child dataset given" >&2 | |
| 203 return 2 | |
| 204 fi | |
| 205 _ds="${_pds}/${_cds}" | |
| 206 echo "Resulting new root dataset is \`${_ds}' at mountpoint \`${_pmp}/${_cds}'" | |
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207 if zfs list -H -o mountpoint -t filesystem "${_ds}" >/dev/null 2>/dev/null; then |
| 73 | 208 echo "ERROR: dataset \`${_ds}' does already exist" >&2 |
| 209 return 1 | |
| 210 fi | |
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211 |
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212 # |
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213 # NOTE: For BEs these directory will be *excluded* from the BE |
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214 # |
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215 # /tmp |
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216 # /usr/home |
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217 # /usr/ports |
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218 # /usr/src |
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219 # /var/audit |
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220 # /var/crash |
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221 # /var/log |
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222 # /var/mail |
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223 # /var/tmp |
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224 # |
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225 zfs create ${_zfsopts} ${_zfsnoauto} -o atime=off "${_ds}" |
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226 zfs create ${_zfsopts} ${_zfsnoauto} -o sync=disabled -o setuid=off "${_ds}/tmp" |
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227 if [ "${_tiny}" != "extra" ]; then |
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228 if [ "${_tiny}" = "yes" ]; then |
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229 zfs create ${_zfsopts} -o canmount=off "${_ds}/usr" |
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230 else |
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231 zfs create ${_zfsopts} ${_zfsnoauto} "${_ds}/usr" |
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232 fi |
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233 zfs create ${_zfsopts} ${_zfsnoauto} -o setuid=off "${_ds}/usr/home" |
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234 zfs create ${_zfsopts} ${_zfsnoauto} "${_ds}/usr/local" |
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235 fi |
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182
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236 if [ \( "${_tiny}" = "yes" \) -o \( "${_tiny}" = "extra" \) ]; then |
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237 zfs create ${_zfsopts} -o canmount=off "${_ds}/var" |
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238 else |
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239 zfs create ${_zfsopts} ${_zfsnoauto} "${_ds}/var" |
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240 fi |
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241 if [ "${_tiny}" != "extra" ]; then |
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242 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off "${_ds}/var/audit" |
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243 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off "${_ds}/var/cache" |
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244 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off -o primarycache=metadata -o compression=off "${_ds}/var/cache/pkg" |
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245 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off -o compression=off "${_ds}/var/crash" |
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246 fi |
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247 if [ "$_fbsdupdate" = "yes" ]; then |
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248 if [ \( "${_tiny}" = "yes" \) -o \( "${_tiny}" = "extra" \) ]; then |
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249 zfs create ${_zfsopts} -o canmount=off -o exec=off -o setuid=off "${_ds}/var/db" |
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250 else |
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251 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off "${_ds}/var/db" |
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252 fi |
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253 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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254 fi |
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255 zfs create ${_zfsopts} ${_zfsnoauto} -o readonly=on -o exec=off -o setuid=off "${_ds}/var/empty" |
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256 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off -o primarycache=metadata "${_ds}/var/log" |
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257 zfs create ${_zfsopts} ${_zfsnoauto} -o exec=off -o setuid=off -o atime=on "${_ds}/var/mail" |
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258 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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259 zfs create ${_zfsopts} ${_zfsnoauto} -o sync=disabled -o setuid=off "${_ds}/var/tmp" |
| 73 | 260 } |
| 261 | |
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262 |
| 73 | 263 # |
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264 # "populate" -- populate the datasets with content from a FreeBSD base.txz |
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265 # |
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266 # command_populate mountpoint basetxz |
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267 # |
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268 command_populate() { |
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269 # MOUNTPOINT -- base.txz |
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270 local _mp _basetxz |
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271 |
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272 _mp="$1" |
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273 _basetxz="$2" |
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274 |
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275 if [ -z "${_mp}" ]; then |
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276 echo "ERROR: no mountpoint given" >&2 |
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277 return 2 |
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278 fi |
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279 if [ -z "${_basetxz}" ]; then |
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280 echo "ERROR: no base.txz given" >&2 |
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281 return 2 |
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282 fi |
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283 if [ ! -d "${_mp}" ]; then |
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284 echo "ERROR: mountpoint \`${_mp}' does not exist" >&2 |
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285 return 1 |
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286 fi |
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287 if [ ! -r "${_basetxz}" ]; then |
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288 echo "ERROR: file \`${_basetxz}' is not readable" >&2 |
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289 return 1 |
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290 fi |
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291 |
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292 # |
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293 # Handle /var/empty separately later: could be already there and |
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294 # mounted read-only. |
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295 # |
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296 tar -C "${_mp}" --exclude=./var/empty -xJp -f "${_basetxz}" || { echo "ERROR: tar encountered errors" >&2; return 1; } |
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297 if [ -d "${_mp}/var/empty" ]; then |
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298 # |
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299 # If /var/empty exists already try to extract with changing the |
|
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300 # flags (e.g. `schg'). But be ignore errors here. |
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301 # |
|
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302 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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303 else |
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304 # Just extract /var/empty normally |
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305 tar -C "${_mp}" -xJp -f "${_basetxz}" ./var/empty || { echo "ERROR: tar encountered errors" >&2; return 1; } |
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306 fi |
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307 |
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308 find "${_mp}/boot" -type f -delete |
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309 } |
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310 |
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311 |
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312 # |
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313 # "copy" -- ZFS copy of datasets |
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314 # |
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315 # command_copy source-dataset destination-dataset |
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316 # |
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317 command_copy() { |
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318 # source dataset -- destination dataset |
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319 local _source _dest |
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320 # dynamic ZFS options -- ZFS copy options |
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321 local _zfsopts _zfscopyopts |
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322 |
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323 _zfsopts="" |
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324 _zfscopyopts="" |
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325 while getopts "ru" _opt ; do |
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326 case ${_opt} in |
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327 r) |
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328 # Use raw datasets |
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329 _zfscopyopts="-Lec" |
|
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330 ;; |
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331 u) |
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332 # do not mount newly created datasets |
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333 _zfsopts="${_zfsopts} -u" |
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334 ;; |
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335 \?|:) |
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336 return 2; |
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337 ;; |
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338 esac |
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339 done |
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340 shift $((OPTIND-1)) |
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341 OPTIND=1 |
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342 |
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343 _source="$1" |
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344 if [ -z "${_source}" ]; then |
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345 echo "ERROR: no source dataset given" >&2 |
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346 return 2 |
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347 fi |
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348 _dest="$2" |
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349 if [ -z "${_dest}" ]; then |
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350 echo "ERROR: no source dataset given" >&2 |
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351 return 2 |
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352 fi |
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353 zfs send -R ${_zfscopyopts} -n -v "${_source}" || { echo "ERROR: ZFS operation failed in no-op mode" >&2; return 1; } |
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354 zfs send -R ${_zfscopyopts} "${_source}" | zfs receive ${_zfsopts} "${_dest}" || { echo "ERROR: ZFS operation failed" >&2; return 1; } |
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355 } |
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356 |
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357 |
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358 # |
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359 # "mount" -- recursively mount a dataset including subordinate datasets |
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360 # |
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361 # command_mount dataset mountpoint |
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362 # |
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363 command_mount() { |
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364 local _dsname _mountpoint |
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365 local _name _mp _canmount _mounted |
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366 local _rootds_mountpoint _relative_mp _real_mp |
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367 local _dry_run |
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368 |
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369 _dry_run="" |
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370 while getopts "nu" _opt ; do |
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371 case ${_opt} in |
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372 n|u) |
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373 _dry_run="yes" |
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374 ;; |
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375 \?|:) |
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376 return 2; |
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377 ;; |
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378 esac |
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379 done |
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380 shift $((OPTIND-1)) |
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381 OPTIND=1 |
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382 |
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383 _dsname="${1-}" |
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384 _mountpoint="${2-}" |
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385 |
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386 if [ -z "${_dsname}" ]; then |
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387 echo "ERROR: no dataset given" >&2 |
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388 return 2 |
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389 fi |
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390 if [ -z "${_mountpoint}" ]; then |
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391 echo "ERROR: no mountpoint given" >&2 |
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392 return 2 |
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393 fi |
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394 # Remove a trailing slash |
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395 _mountpoint="${_mountpoint%/}" |
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396 if [ -z "${_mountpoint}" ]; then |
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397 echo "ERROR: would mount over the root filesystem" >&2 |
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398 return 1 |
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399 fi |
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400 |
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401 _rootds_mountpoint="$(zfs list -H -o mountpoint -t filesystem "${_dsname}")" || \ |
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402 { echo "ERROR: root dataset does not exist" >&2; return 1; } |
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403 |
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404 zfs list -H -o name,mountpoint,canmount,mounted -s mountpoint -t filesystem -r "${_dsname}" \ |
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405 | { |
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406 while IFS=$'\t' read -r _name _mp _canmount _mounted ; do |
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407 # Skip filesystems that are already mounted |
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408 [ "${_mounted}" = "yes" ] && continue |
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409 # Skip filesystems that must not be mounted |
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410 [ "${_canmount}" = "off" ] && continue |
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411 case "${_mp}" in |
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412 "none"|"legacy") |
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413 # Do nothing for filesystem with unset or legacy mountpoints |
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414 ;; |
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415 "${_rootds_mountpoint}"|"${_rootds_mountpoint}/"*) |
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416 # |
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417 # Handle only mountpoints that have a mountpoint below |
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418 # the parent datasets mountpoint |
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419 # |
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420 |
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421 # Determine the mountpoint relative to the parent mountpoint |
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422 _relative_mp="${_mp#${_rootds_mountpoint}}" |
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423 # Remove a trailing slash |
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424 _relative_mp="${_relative_mp%/}" |
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425 _real_mp="${_mountpoint}${_relative_mp}" |
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426 if [ "${_dry_run}" = "yes" ]; then |
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427 echo "Would mount ${_name} on ${_real_mp}" |
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428 else |
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429 mkdir -p "${_real_mp}" 1> /dev/null 2> /dev/null || \ |
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430 { echo "ERROR: cannot create mountpoint ${_real_mp}" >&2; return 1; } |
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431 echo "Mounting ${_name} on ${_real_mp}" |
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432 mount -t zfs "${_name}" "${_real_mp}" || return 1 |
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433 fi |
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434 ;; |
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435 *) |
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436 # XXX FIXME Option to do a zfs mount $_name ??? |
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437 echo "Skipping ${_name} because its configured mountpoint is not relative to given root dataset" 2>&1 |
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438 ;; |
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439 esac |
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440 done |
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441 |
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442 return 0 |
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443 } |
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444 } |
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445 |
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446 |
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447 # |
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448 # "umount" -- Recursively unmount ZFS datasets |
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449 # |
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450 # command_umount dataset |
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451 # |
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452 command_umount() { |
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453 local _dsname |
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454 local _name _mp _rest |
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455 local _rootds_mountpoint |
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456 |
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457 _dsname="${1-}" |
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458 [ -z "${_dsname}" ] && \ |
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459 { echo "ERROR: no dataset given" >&2; return 2; } |
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460 |
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461 # Just determine whether the given dataset name exists |
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462 _rootds_mountpoint="$(zfs list -H -o mountpoint -t filesystem "${_dsname}")" || { echo "ERROR: dataset not found" >&2; return 1; } |
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463 |
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464 mount -t zfs -p \ |
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465 | grep -E "^${_dsname}(/|\s)" \ |
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466 | sort -n -r \ |
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467 | { |
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468 while IFS=' '$'\t' read -r _name _mp _rest ; do |
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469 echo "Umounting ${_name} on ${_mp}" |
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470 umount "${_mp}" || return 1 |
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471 done |
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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 # |
| 73 | 478 # "privs" -- adjust privileges |
| 479 # | |
| 480 # To be used when all ZFS datasets are mounted. | |
| 481 # | |
| 482 command_privs() { | |
| 483 # mountpoint | |
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484 local _mp _d _veds _get _vestatus |
| 73 | 485 |
| 486 _mp="$1" | |
| 487 if [ -z "${_mp}" ]; then | |
| 488 echo "ERROR: no mountpoint given" >&2 | |
| 489 return 2 | |
| 490 fi | |
| 491 if [ ! -d "${_mp}" ]; then | |
| 492 echo "ERROR: directory \`${_mp}' does not exist" >&2 | |
| 493 return 1 | |
| 494 fi | |
| 495 for _d in tmp var/tmp ; do | |
| 496 chmod 01777 "${_mp}/${_d}" | |
| 497 done | |
| 498 chown root:mail "${_mp}/var/mail" | |
| 499 chmod 0775 "${_mp}/var/mail" | |
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500 |
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501 # |
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502 # Handle <mountpoint>/var/empty specially: |
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503 # make it writeable temporarily if it is mounted read-only: |
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504 # |
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505 _vestatus="" |
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506 _veds="$(_get_dataset_for_varempty "${_mp}")" |
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507 if [ $? -eq 0 ]; then |
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203
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508 _vestatus=$(zfs list -H -o readonly -t filesystem ${_veds} 2>/dev/null) || { echo "ERROR: cannot determine readonly status of ${_mp}/var/empty" >&2; return 1; } |
|
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509 if [ "${_vestatus}" = "on" ]; then |
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510 zfs set readonly=off ${_veds} 1> /dev/null || { echo "ERROR: cannot reset readonly-status of ${_mp}/var/empty" >&2; return 1; } |
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511 fi |
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512 fi |
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513 # Set the access rights and the file flags as given in mtree |
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514 chmod 0555 "${_mp}/var/empty" || { echo "WARNING: Cannot chmod on var/empty" >&2; } |
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515 chflags schg "${_mp}/var/empty" || { echo "WARNING: Cannot chflags on var/empty" >&2; } |
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516 # Reset the read-only status of the mountpoint as it was before |
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517 if [ "${_vestatus}" = "on" ]; then |
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518 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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519 fi |
| 73 | 520 } |
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521 |
|
74
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522 |
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523 # |
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524 # Global option handling |
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525 # |
|
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526 while getopts "Vh" _opt ; do |
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527 case ${_opt} in |
|
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528 V) |
|
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529 printf 'fjail v%s (rv:%s)\n' "${VERSION}" '@@HGREVISION@@' |
|
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530 exit 0 |
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531 ;; |
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532 h) |
| 75 | 533 echo "${USAGE}" |
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534 exit 0 |
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535 ;; |
|
80
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536 \?) |
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537 exit 2; |
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538 ;; |
|
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539 *) |
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540 echo "ERROR: option handling failed" >&2 |
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541 exit 2 |
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542 ;; |
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543 esac |
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544 done |
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545 |
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546 # |
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547 # Reset the Shell's option handling system to prepare for handling |
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548 # command-local options. |
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549 # |
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550 shift $((OPTIND-1)) |
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551 OPTIND=1 |
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552 |
|
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553 test $# -gt 0 || { echo "ERROR: no command given" >&2; exit 2; } |
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554 |
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555 command="$1" |
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556 shift |
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557 |
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558 case "${command}" in |
| 73 | 559 datasets) |
| 560 command_datasets "$@" | |
| 561 ;; | |
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562 mount) |
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563 command_mount "$@" |
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564 ;; |
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565 umount|unmount) |
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566 command_umount "$@" |
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567 ;; |
| 73 | 568 privs) |
| 569 command_privs "$@" | |
| 570 ;; | |
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571 populate) |
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572 command_populate "$@" |
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573 ;; |
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574 copy) |
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575 command_copy "$@" |
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576 ;; |
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577 *) |
|
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578 echo "ERROR: unknown command \`${command}'" >&2 |
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579 exit 2 |
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580 ;; |
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581 esac |