Mercurial > hgrepos > FreeBSD > ports > sysutils > local-bsdtools
annotate sbin/fjail @ 183:ea491007d7fb
FIX: Because of set -eu: ignore errors from tar explicitely
| author | Franz Glasner <hg@dom66.de> |
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| date | Tue, 16 Aug 2022 13:03:29 +0200 |
| parents | dbd62c32b3fd |
| children | 2e7d0c967c36 |
| 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 |
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6 :Copyright: (c) 2019 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 -s Also create a dataset for freebsd-update data files |
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38 -t Create a more tiny set of datasets |
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39 -T Create only an extra tiny set of datasets |
| 75 | 40 -u Do not automatically mount newly created datasets |
| 41 | |
| 42 privs MOUNTPOINT | |
| 43 | |
| 44 Adjust some Unix privileges to mounted jail datasets | |
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45 |
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46 populate MOUNTPOINT BASETXZ |
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47 |
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48 Populate the jail directory in MOUNTPOINT with the base system in BASETXZ |
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49 |
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50 copy SOURCE-DATASET DEST-DATASET |
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51 |
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52 Copy a tree of ZFS datasets with "zfs send -R" and "zfs receive". |
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53 Note that the destination dataset must not exist already. |
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54 |
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55 -r Copy the datasets with the -Lec options (aka "raw") |
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56 -u Do not automatically mount received datasets |
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57 |
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58 ENVIRONMENT: |
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59 |
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60 All environment variables that affect "zfs" are effective also. |
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61 |
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62 DESCRIPTION: |
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63 |
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64 All commands with the exception of "populate" require ZFS as |
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65 filesystem. |
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66 ' |
| 75 | 67 |
| 68 | |
| 73 | 69 # Reset to standard umask |
| 70 umask 0022 | |
| 71 | |
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72 |
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73 _get_dataset_for_mountpoint() { |
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74 : 'Use `zfs mount` to determine the ZFS dataset for a given mountpoint. |
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75 |
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76 ' |
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77 local _mountpoint |
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78 local _ds _mount |
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79 |
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80 _mountpoint="$1" |
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81 |
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82 while read -r _ds _mount; do |
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83 if [ "$_mount" = "$_mountpoint" ]; then |
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84 echo $_ds |
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85 return 0 |
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86 fi |
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87 done <<EOF__GDSFM |
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88 $(zfs mount) |
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89 EOF__GDSFM |
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90 return 1 |
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91 } |
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92 |
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93 |
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94 _get_dataset_for_varempty() { |
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95 : 'Allow special handling for <mountpoint>/var/empty which may be |
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96 mounted read-only. |
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97 |
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98 ' |
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99 local _mountpoint |
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100 local _ve_mount |
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101 |
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102 _mountpoint="$1" |
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103 |
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104 if [ "$_mountpoint" = '/' ]; then |
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105 _ve_mount='/var/empty' |
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106 else |
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107 _ve_mount="${_mountpoint}/var/empty" |
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108 fi |
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109 |
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110 _get_dataset_for_mountpoint "${_ve_mount}" |
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111 } |
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112 |
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113 |
| 73 | 114 # |
| 115 # "datasets" -- create the ZFS dataset tree | |
| 116 # | |
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117 # command_datasets [ -u ] parent-dataset child-dataset |
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118 # |
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119 # -u do not automatically mount newly created datasets |
| 73 | 120 # |
| 121 command_datasets() { | |
| 122 # parent ZFS dataset -- child ZFS dataset name | |
| 123 local _pds _cds | |
| 124 # and its mount point | |
| 125 local _pmp _get _dummy | |
| 126 # full name of the dataset | |
| 127 local _ds | |
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128 # dynamic ZFS options -- create cache for freebsd-update -- use a more tiny layout |
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129 local _zfsopts _fbsdupdate _tiny |
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130 |
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131 _zfsopts="" |
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132 _fbsdupdate="" |
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133 _tiny="no" |
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134 while getopts "ustT" _opt ; do |
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135 case ${_opt} in |
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136 t) |
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137 # use a more tiny layout |
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138 _tiny="yes" |
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139 ;; |
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140 T) # extra tiny layout |
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141 _tiny="extra" |
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142 ;; |
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143 u) |
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144 # do not mount newly created datasets |
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145 _zfsopts="${_zfsopts} -u" |
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146 ;; |
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147 s) |
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148 # create also a dataset for freebsd-update data |
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149 _fbsdupdate="yes" |
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150 ;; |
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151 \?|:) |
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152 return 2; |
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153 ;; |
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154 esac |
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155 done |
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156 shift $((OPTIND-1)) |
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157 OPTIND=1 |
| 73 | 158 |
| 159 _pds="$1" | |
| 160 if [ -z "${_pds}" ]; then | |
| 161 echo "ERROR: no parent dataset given" >&2 | |
| 162 return 2 | |
| 163 fi | |
| 164 _get=$(zfs get -H mountpoint "${_pds}" 2>/dev/null) || { echo "ERROR: dataset \`${_pds}' does not exist" >&2; return 1; } | |
| 165 IFS=$'\t' read _dummy _dummy _pmp _dummy <<EOF | |
| 166 ${_get} | |
| 167 EOF | |
| 168 case "${_pmp}" in | |
| 169 none) | |
| 170 echo "ERROR: dataset \`${_pds}' has no mountpoint" >&2 | |
| 171 return 1 | |
| 172 ;; | |
| 173 legacy) | |
| 174 echo "ERROR: dataset \`${_pds}' has a \`${_mp}' mountpoint" >&2 | |
| 175 return 1 | |
| 176 ;; | |
| 177 *) | |
| 178 # VOID | |
| 179 ;; | |
| 180 esac | |
| 181 _cds="$2" | |
| 182 if [ -z "${_cds}" ]; then | |
| 183 echo "ERROR: no child dataset given" >&2 | |
| 184 return 2 | |
| 185 fi | |
| 186 _ds="${_pds}/${_cds}" | |
| 187 echo "Resulting new root dataset is \`${_ds}' at mountpoint \`${_pmp}/${_cds}'" | |
| 188 if zfs get -H mountpoint "${_ds}" >/dev/null 2>/dev/null; then | |
| 189 echo "ERROR: dataset \`${_ds}' does already exist" >&2 | |
| 190 return 1 | |
| 191 fi | |
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192 |
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193 # |
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194 # NOTE: For BEs these directory will be *excluded* from the BE |
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195 # |
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196 # /tmp |
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197 # /usr/home |
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198 # /usr/ports |
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199 # /usr/src |
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200 # /var/audit |
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201 # /var/crash |
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202 # /var/log |
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203 # /var/mail |
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204 # /var/tmp |
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205 # |
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206 zfs create ${_zfsopts} -o atime=off "${_ds}" |
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207 zfs create ${_zfsopts} -o sync=disabled -o setuid=off "${_ds}/tmp" |
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208 if [ "${_tiny}" != "extra" ]; then |
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209 if [ "${_tiny}" = "yes" ]; then |
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210 zfs create ${_zfsopts} -o canmount=off "${_ds}/usr" |
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211 else |
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212 zfs create ${_zfsopts} "${_ds}/usr" |
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213 fi |
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214 zfs create ${_zfsopts} -o setuid=off "${_ds}/usr/home" |
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215 zfs create ${_zfsopts} "${_ds}/usr/local" |
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216 fi |
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217 if [ \( "${_tiny}" = "yes" \) -o \( "${_tiny}" = "extra" \) ]; then |
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218 zfs create ${_zfsopts} -o canmount=off "${_ds}/var" |
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219 else |
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220 zfs create ${_zfsopts} "${_ds}/var" |
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221 fi |
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222 if [ "${_tiny}" != "extra" ]; then |
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223 zfs create ${_zfsopts} -o exec=off -o setuid=off "${_ds}/var/audit" |
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224 zfs create ${_zfsopts} -o exec=off -o setuid=off "${_ds}/var/cache" |
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225 zfs create ${_zfsopts} -o exec=off -o setuid=off -o primarycache=metadata -o compression=off "${_ds}/var/cache/pkg" |
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226 zfs create ${_zfsopts} -o exec=off -o setuid=off -o compression=off "${_ds}/var/crash" |
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227 fi |
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228 if [ "$_fbsdupdate" = "yes" ]; then |
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229 if [ \( "${_tiny}" = "yes" \) -o \( "${_tiny}" = "extra" \) ]; then |
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230 zfs create ${_zfsopts} -o canmount=off -o exec=off -o setuid=off "${_ds}/var/db" |
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231 else |
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232 zfs create ${_zfsopts} -o exec=off -o setuid=off "${_ds}/var/db" |
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233 fi |
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234 zfs create ${_zfsopts} -o exec=off -o setuid=off -o primarycache=metadata -o compression=off "${_ds}/var/db/freebsd-update" |
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235 fi |
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236 zfs create ${_zfsopts} -o readonly=on -o exec=off -o setuid=off "${_ds}/var/empty" |
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237 zfs create ${_zfsopts} -o exec=off -o setuid=off -o primarycache=metadata "${_ds}/var/log" |
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238 zfs create ${_zfsopts} -o exec=off -o setuid=off -o atime=on "${_ds}/var/mail" |
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239 zfs create ${_zfsopts} -o sync=disabled -o exec=off -o setuid=off -o compression=off -o primarycache=all "${_ds}/var/run" |
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240 zfs create ${_zfsopts} -o sync=disabled -o setuid=off "${_ds}/var/tmp" |
| 73 | 241 } |
| 242 | |
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243 |
| 73 | 244 # |
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245 # "populate" -- populate the datasets with content from a FreeBSD base.txz |
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246 # |
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247 # command_populate mountpoint basetxz |
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248 # |
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249 command_populate() { |
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250 # MOUNTPOINT -- base.txz |
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251 local _mp _basetxz |
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252 |
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253 _mp="$1" |
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254 _basetxz="$2" |
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255 |
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256 if [ -z "${_mp}" ]; then |
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257 echo "ERROR: no mountpoint given" >&2 |
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258 return 2 |
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259 fi |
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260 if [ -z "${_basetxz}" ]; then |
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261 echo "ERROR: no base.txz given" >&2 |
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262 return 2 |
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263 fi |
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264 if [ ! -d "${_mp}" ]; then |
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265 echo "ERROR: mountpoint \`${_mp}' does not exist" >&2 |
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266 return 1 |
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267 fi |
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268 if [ ! -r "${_basetxz}" ]; then |
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269 echo "ERROR: file \`${_basetxz}' is not readable" >&2 |
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270 return 1 |
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271 fi |
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272 |
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273 # |
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274 # Handle /var/empty separately later: could be already there and |
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275 # mounted read-only. |
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276 # |
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277 tar -C "${_mp}" --exclude=./var/empty -xJp -f "${_basetxz}" || { echo "ERROR: tar encountered errors" >&2; return 1; } |
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278 if [ -d "${_mp}/var/empty" ]; then |
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279 # |
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280 # If /var/empty exists already try to extract with changing the |
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281 # flags (e.g. `schg'). But be ignore errors here. |
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282 # |
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283 tar -C "${_mp}" -xJp -f "${_basetxz}" ./var/empty || true |
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284 else |
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285 # Just extract /var/empty normally |
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286 tar -C "${_mp}" -xJp -f "${_basetxz}" ./var/empty || { echo "ERROR: tar encountered errors" >&2; return 1; } |
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287 fi |
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288 |
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289 find "${_mp}/boot" -type f -delete |
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290 } |
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291 |
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292 |
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293 # |
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294 # "copy" -- ZFS copy of datasets |
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295 # |
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296 # command_copy source-dataset destination-dataset |
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297 # |
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298 command_copy() { |
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299 # source dataset -- destination dataset |
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300 local _source _dest |
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301 # dynamic ZFS options -- ZFS copy options |
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302 local _zfsopts _zfscopyopts |
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303 |
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304 _zfsopts="" |
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305 _zfscopyopts="" |
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306 while getopts "ru" _opt ; do |
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307 case ${_opt} in |
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308 r) |
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309 # Use raw datasets |
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310 _zfscopyopts="-Lec" |
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311 ;; |
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312 u) |
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313 # do not mount newly created datasets |
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314 _zfsopts="${_zfsopts} -u" |
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315 ;; |
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316 \?|:) |
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317 return 2; |
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318 ;; |
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319 esac |
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320 done |
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321 shift $((OPTIND-1)) |
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322 OPTIND=1 |
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323 |
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324 _source="$1" |
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325 if [ -z "${_source}" ]; then |
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326 echo "ERROR: no source dataset given" >&2 |
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327 return 2 |
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328 fi |
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329 _dest="$2" |
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330 if [ -z "${_dest}" ]; then |
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331 echo "ERROR: no source dataset given" >&2 |
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332 return 2 |
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333 fi |
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334 zfs send -R ${_zfscopyopts} -n -v "${_source}" || { echo "ERROR: ZFS operation failed in no-op mode" >&2; return 1; } |
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335 zfs send -R ${_zfscopyopts} "${_source}" | zfs receive ${_zfsopts} "${_dest}" || { echo "ERROR: ZFS operation failed" >&2; return 1; } |
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336 } |
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337 |
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338 |
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339 # |
| 73 | 340 # "privs" -- adjust privileges |
| 341 # | |
| 342 # To be used when all ZFS datasets are mounted. | |
| 343 # | |
| 344 command_privs() { | |
| 345 # mountpoint | |
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346 local _mp _d _veds _get _vestatus |
| 73 | 347 |
| 348 _mp="$1" | |
| 349 if [ -z "${_mp}" ]; then | |
| 350 echo "ERROR: no mountpoint given" >&2 | |
| 351 return 2 | |
| 352 fi | |
| 353 if [ ! -d "${_mp}" ]; then | |
| 354 echo "ERROR: directory \`${_mp}' does not exist" >&2 | |
| 355 return 1 | |
| 356 fi | |
| 357 for _d in tmp var/tmp ; do | |
| 358 chmod 01777 "${_mp}/${_d}" | |
| 359 done | |
| 360 chown root:mail "${_mp}/var/mail" | |
| 361 chmod 0775 "${_mp}/var/mail" | |
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362 |
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363 # |
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364 # Handle <mountpoint>/var/empty specially: |
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365 # make it writeable temporarily if it is mounted read-only: |
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366 # |
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367 _vestatus="" |
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368 _veds=$(_get_dataset_for_varempty "${_mp}") |
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369 if [ $? -eq 0 ]; then |
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370 _get=$(zfs get -H readonly ${_veds} 2>/dev/null) || { echo "ERROR: cannot determine readonly status of ${_mp}/var/empty" >&2; return 1; } |
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371 IFS=$'\t' read _dummy _dummy _vestatus _dummy <<EOF |
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372 ${_get} |
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373 EOF |
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374 if [ "${_vestatus}" = "on" ]; then |
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375 zfs set readonly=off ${_veds} >/dev/null 2>/dev/null || { echo "ERROR: cannot reset readonly-status of ${_mp}/var/empty" >&2; return 1; } |
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376 fi |
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377 fi |
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378 # Set the access rights and the file flags as given in mtree |
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379 chmod 0555 "${_mp}/var/empty" |
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380 chflags schg "${_mp}/var/empty" |
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381 # Reset the read-only status of the mountpoint as it was before |
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382 if [ "${_vestatus}" = "on" ]; then |
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383 zfs set readonly=on ${_veds} >/dev/null 2>/dev/null || { echo "ERROR: cannot reactivate readonly-status of ${_mp}/var/empty" >&2; return 1; } |
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384 fi |
| 73 | 385 } |
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386 |
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387 |
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388 # |
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389 # Global option handling |
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390 # |
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391 while getopts "Vh" _opt ; do |
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392 case ${_opt} in |
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393 V) |
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394 printf 'fjail v%s (rv:%s)\n' "${VERSION}" '@@HGREVISION@@' |
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395 exit 0 |
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396 ;; |
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397 h) |
| 75 | 398 echo "${USAGE}" |
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399 exit 0 |
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400 ;; |
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401 \?) |
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402 exit 2; |
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403 ;; |
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404 *) |
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405 echo "ERROR: option handling failed" >&2 |
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406 exit 2 |
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407 ;; |
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408 esac |
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409 done |
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410 |
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411 # |
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412 # Reset the Shell's option handling system to prepare for handling |
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413 # command-local options. |
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414 # |
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415 shift $((OPTIND-1)) |
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416 OPTIND=1 |
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417 |
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418 test $# -gt 0 || { echo "ERROR: no command given" >&2; exit 2; } |
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419 |
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420 command="$1" |
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421 shift |
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422 |
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423 case "${command}" in |
| 73 | 424 datasets) |
| 425 command_datasets "$@" | |
| 426 ;; | |
| 427 privs) | |
| 428 command_privs "$@" | |
| 429 ;; | |
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430 populate) |
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431 command_populate "$@" |
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432 ;; |
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433 copy) |
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434 command_copy "$@" |
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435 ;; |
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436 *) |
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437 echo "ERROR: unknown command \`${command}'" >&2 |
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438 exit 2 |
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439 ;; |
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440 esac |