Mercurial > hgrepos > FreeBSD > ports > sysutils > local-bsdtools
annotate sbin/fjail @ 198:dd8a9bbdf8c0
Better error handling when changing privileges and flags of var/empty
| author | Franz Glasner <fzglas.hg@dom66.de> |
|---|---|
| date | Sun, 21 Aug 2022 11:00:58 +0200 |
| parents | 3181a6b5758e |
| children | a8b6584d24ec |
| 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 -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 | |
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42 mount [-u] [-n] DATASET MOUNTPOINT |
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43 |
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44 Mount the ZFS dataset DATASET and all its children to mountpoint |
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45 MOUNTPOINT |
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46 |
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47 -n Do not really mount but show what would be mounted where |
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48 -u Alias of -n |
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49 |
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50 umount DATASET |
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51 |
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52 Unmount the mounted DATASET and all its children |
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53 |
| 75 | 54 privs MOUNTPOINT |
| 55 | |
| 56 Adjust some Unix privileges to mounted jail datasets | |
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57 |
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58 populate MOUNTPOINT BASETXZ |
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59 |
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60 Populate the jail directory in MOUNTPOINT with the base system in BASETXZ |
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61 |
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62 copy SOURCE-DATASET DEST-DATASET |
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63 |
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64 Copy a tree of ZFS datasets with "zfs send -R" and "zfs receive". |
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65 Note that the destination dataset must not exist already. |
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66 |
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67 -r Copy the datasets with the -Lec options (aka "raw") |
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68 -u Do not automatically mount received datasets |
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69 |
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70 ENVIRONMENT: |
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71 |
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72 All environment variables that affect "zfs" are effective also. |
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73 |
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74 DESCRIPTION: |
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75 |
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76 All commands with the exception of "populate" require ZFS as |
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77 filesystem. |
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78 ' |
| 75 | 79 |
| 80 | |
| 73 | 81 # Reset to standard umask |
| 82 umask 0022 | |
| 83 | |
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84 |
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85 _get_dataset_for_mountpoint() { |
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86 : 'Use `mount -t zfs -p` to determine the ZFS dataset for a given mountpoint. |
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87 |
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88 ' |
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89 local _mountpoint |
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90 local _ds _mount _rest |
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91 |
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92 _mountpoint="$1" |
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93 |
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94 mount -t zfs -p \ |
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95 | { |
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96 while IFS=' '$'\t' read -r _ds _mount _rest ; do |
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97 if [ "$_mount" = "$_mountpoint" ]; then |
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98 echo "${_ds}" |
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99 return 0 |
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100 fi |
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101 done |
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102 return 1 |
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103 } |
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104 } |
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105 |
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106 |
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107 _get_dataset_for_varempty() { |
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108 : 'Allow special handling for <mountpoint>/var/empty which may be |
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109 mounted read-only. |
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110 |
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111 ' |
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112 local _mountpoint |
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113 local _ve_mount |
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114 |
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115 _mountpoint="$1" |
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116 |
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117 if [ "$_mountpoint" = '/' ]; then |
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118 _ve_mount='/var/empty' |
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119 else |
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120 _ve_mount="${_mountpoint}/var/empty" |
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121 fi |
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122 |
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123 _get_dataset_for_mountpoint "${_ve_mount}" |
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124 } |
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125 |
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126 |
| 73 | 127 # |
| 128 # "datasets" -- create the ZFS dataset tree | |
| 129 # | |
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130 # command_datasets [ -u ] parent-dataset child-dataset |
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131 # |
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132 # -u do not automatically mount newly created datasets |
| 73 | 133 # |
| 134 command_datasets() { | |
| 135 # parent ZFS dataset -- child ZFS dataset name | |
| 136 local _pds _cds | |
| 137 # and its mount point | |
| 138 local _pmp _get _dummy | |
| 139 # full name of the dataset | |
| 140 local _ds | |
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141 # dynamic ZFS options -- create cache for freebsd-update -- use a more tiny layout |
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142 local _zfsopts _fbsdupdate _tiny |
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143 |
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144 _zfsopts="" |
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145 _fbsdupdate="" |
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146 _tiny="no" |
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147 while getopts "ustT" _opt ; do |
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148 case ${_opt} in |
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149 t) |
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150 # use a more tiny layout |
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151 _tiny="yes" |
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152 ;; |
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153 T) # extra tiny layout |
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154 _tiny="extra" |
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155 ;; |
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156 u) |
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157 # do not mount newly created datasets |
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158 _zfsopts="${_zfsopts} -u" |
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159 ;; |
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160 s) |
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161 # create also a dataset for freebsd-update data |
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162 _fbsdupdate="yes" |
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163 ;; |
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164 \?|:) |
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165 return 2; |
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166 ;; |
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167 esac |
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168 done |
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169 shift $((OPTIND-1)) |
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170 OPTIND=1 |
| 73 | 171 |
| 172 _pds="$1" | |
| 173 if [ -z "${_pds}" ]; then | |
| 174 echo "ERROR: no parent dataset given" >&2 | |
| 175 return 2 | |
| 176 fi | |
| 177 _get=$(zfs get -H mountpoint "${_pds}" 2>/dev/null) || { echo "ERROR: dataset \`${_pds}' does not exist" >&2; return 1; } | |
| 178 IFS=$'\t' read _dummy _dummy _pmp _dummy <<EOF | |
| 179 ${_get} | |
| 180 EOF | |
| 181 case "${_pmp}" in | |
| 182 none) | |
| 183 echo "ERROR: dataset \`${_pds}' has no mountpoint" >&2 | |
| 184 return 1 | |
| 185 ;; | |
| 186 legacy) | |
| 187 echo "ERROR: dataset \`${_pds}' has a \`${_mp}' mountpoint" >&2 | |
| 188 return 1 | |
| 189 ;; | |
| 190 *) | |
| 191 # VOID | |
| 192 ;; | |
| 193 esac | |
| 194 _cds="$2" | |
| 195 if [ -z "${_cds}" ]; then | |
| 196 echo "ERROR: no child dataset given" >&2 | |
| 197 return 2 | |
| 198 fi | |
| 199 _ds="${_pds}/${_cds}" | |
| 200 echo "Resulting new root dataset is \`${_ds}' at mountpoint \`${_pmp}/${_cds}'" | |
| 201 if zfs get -H mountpoint "${_ds}" >/dev/null 2>/dev/null; then | |
| 202 echo "ERROR: dataset \`${_ds}' does already exist" >&2 | |
| 203 return 1 | |
| 204 fi | |
|
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205 |
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206 # |
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207 # NOTE: For BEs these directory will be *excluded* from the BE |
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208 # |
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209 # /tmp |
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210 # /usr/home |
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211 # /usr/ports |
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212 # /usr/src |
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213 # /var/audit |
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214 # /var/crash |
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215 # /var/log |
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216 # /var/mail |
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217 # /var/tmp |
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218 # |
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219 zfs create ${_zfsopts} -o atime=off "${_ds}" |
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220 zfs create ${_zfsopts} -o sync=disabled -o setuid=off "${_ds}/tmp" |
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221 if [ "${_tiny}" != "extra" ]; then |
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222 if [ "${_tiny}" = "yes" ]; then |
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223 zfs create ${_zfsopts} -o canmount=off "${_ds}/usr" |
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224 else |
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225 zfs create ${_zfsopts} "${_ds}/usr" |
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226 fi |
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227 zfs create ${_zfsopts} -o setuid=off "${_ds}/usr/home" |
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228 zfs create ${_zfsopts} "${_ds}/usr/local" |
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229 fi |
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230 if [ \( "${_tiny}" = "yes" \) -o \( "${_tiny}" = "extra" \) ]; then |
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231 zfs create ${_zfsopts} -o canmount=off "${_ds}/var" |
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232 else |
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233 zfs create ${_zfsopts} "${_ds}/var" |
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234 fi |
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235 if [ "${_tiny}" != "extra" ]; then |
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236 zfs create ${_zfsopts} -o exec=off -o setuid=off "${_ds}/var/audit" |
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237 zfs create ${_zfsopts} -o exec=off -o setuid=off "${_ds}/var/cache" |
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238 zfs create ${_zfsopts} -o exec=off -o setuid=off -o primarycache=metadata -o compression=off "${_ds}/var/cache/pkg" |
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239 zfs create ${_zfsopts} -o exec=off -o setuid=off -o compression=off "${_ds}/var/crash" |
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240 fi |
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241 if [ "$_fbsdupdate" = "yes" ]; then |
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242 if [ \( "${_tiny}" = "yes" \) -o \( "${_tiny}" = "extra" \) ]; then |
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243 zfs create ${_zfsopts} -o canmount=off -o exec=off -o setuid=off "${_ds}/var/db" |
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244 else |
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245 zfs create ${_zfsopts} -o exec=off -o setuid=off "${_ds}/var/db" |
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246 fi |
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247 zfs create ${_zfsopts} -o exec=off -o setuid=off -o primarycache=metadata -o compression=off "${_ds}/var/db/freebsd-update" |
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248 fi |
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249 zfs create ${_zfsopts} -o readonly=on -o exec=off -o setuid=off "${_ds}/var/empty" |
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250 zfs create ${_zfsopts} -o exec=off -o setuid=off -o primarycache=metadata "${_ds}/var/log" |
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251 zfs create ${_zfsopts} -o exec=off -o setuid=off -o atime=on "${_ds}/var/mail" |
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252 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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253 zfs create ${_zfsopts} -o sync=disabled -o setuid=off "${_ds}/var/tmp" |
| 73 | 254 } |
| 255 | |
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256 |
| 73 | 257 # |
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258 # "populate" -- populate the datasets with content from a FreeBSD base.txz |
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259 # |
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260 # command_populate mountpoint basetxz |
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261 # |
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262 command_populate() { |
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263 # MOUNTPOINT -- base.txz |
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264 local _mp _basetxz |
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265 |
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266 _mp="$1" |
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267 _basetxz="$2" |
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268 |
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269 if [ -z "${_mp}" ]; then |
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270 echo "ERROR: no mountpoint given" >&2 |
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271 return 2 |
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272 fi |
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273 if [ -z "${_basetxz}" ]; then |
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274 echo "ERROR: no base.txz given" >&2 |
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275 return 2 |
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276 fi |
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277 if [ ! -d "${_mp}" ]; then |
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278 echo "ERROR: mountpoint \`${_mp}' does not exist" >&2 |
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279 return 1 |
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280 fi |
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281 if [ ! -r "${_basetxz}" ]; then |
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282 echo "ERROR: file \`${_basetxz}' is not readable" >&2 |
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283 return 1 |
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284 fi |
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285 |
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286 # |
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287 # Handle /var/empty separately later: could be already there and |
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288 # mounted read-only. |
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289 # |
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164
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290 tar -C "${_mp}" --exclude=./var/empty -xJp -f "${_basetxz}" || { echo "ERROR: tar encountered errors" >&2; return 1; } |
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291 if [ -d "${_mp}/var/empty" ]; then |
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292 # |
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293 # If /var/empty exists already try to extract with changing the |
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294 # flags (e.g. `schg'). But be ignore errors here. |
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295 # |
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184
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296 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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297 else |
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298 # Just extract /var/empty normally |
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299 tar -C "${_mp}" -xJp -f "${_basetxz}" ./var/empty || { echo "ERROR: tar encountered errors" >&2; return 1; } |
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300 fi |
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301 |
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302 find "${_mp}/boot" -type f -delete |
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303 } |
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304 |
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305 |
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306 # |
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307 # "copy" -- ZFS copy of datasets |
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308 # |
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309 # command_copy source-dataset destination-dataset |
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310 # |
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311 command_copy() { |
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312 # source dataset -- destination dataset |
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313 local _source _dest |
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314 # dynamic ZFS options -- ZFS copy options |
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315 local _zfsopts _zfscopyopts |
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316 |
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317 _zfsopts="" |
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318 _zfscopyopts="" |
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319 while getopts "ru" _opt ; do |
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320 case ${_opt} in |
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321 r) |
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322 # Use raw datasets |
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323 _zfscopyopts="-Lec" |
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324 ;; |
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325 u) |
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326 # do not mount newly created datasets |
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327 _zfsopts="${_zfsopts} -u" |
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328 ;; |
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329 \?|:) |
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330 return 2; |
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331 ;; |
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332 esac |
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333 done |
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334 shift $((OPTIND-1)) |
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335 OPTIND=1 |
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336 |
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337 _source="$1" |
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338 if [ -z "${_source}" ]; then |
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339 echo "ERROR: no source dataset given" >&2 |
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340 return 2 |
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341 fi |
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342 _dest="$2" |
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343 if [ -z "${_dest}" ]; then |
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344 echo "ERROR: no source dataset given" >&2 |
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345 return 2 |
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346 fi |
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347 zfs send -R ${_zfscopyopts} -n -v "${_source}" || { echo "ERROR: ZFS operation failed in no-op mode" >&2; return 1; } |
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348 zfs send -R ${_zfscopyopts} "${_source}" | zfs receive ${_zfsopts} "${_dest}" || { echo "ERROR: ZFS operation failed" >&2; return 1; } |
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349 } |
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350 |
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351 |
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352 # |
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353 # "mount" -- recursively mount a dataset including subordinate datasets |
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354 # |
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355 # command_mount dataset mountpoint |
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356 # |
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357 command_mount() { |
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358 local _dsname _mountpoint |
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359 local _name _mp _canmount _mounted |
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360 local _rootds_mountpoint _relative_mp _real_mp |
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361 local _dry_run |
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362 |
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363 _dry_run="" |
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364 while getopts "nu" _opt ; do |
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365 case ${_opt} in |
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366 n|u) |
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367 _dry_run="yes" |
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368 ;; |
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369 \?|:) |
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370 return 2; |
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371 ;; |
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372 esac |
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373 done |
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374 shift $((OPTIND-1)) |
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375 OPTIND=1 |
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376 |
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377 _dsname="${1-}" |
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378 _mountpoint="${2-}" |
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379 |
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380 if [ -z "${_dsname}" ]; then |
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381 echo "ERROR: no dataset given" >&2 |
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382 return 2 |
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383 fi |
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384 if [ -z "${_mountpoint}" ]; then |
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385 echo "ERROR: no mountpoint given" >&2 |
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386 return 2 |
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387 fi |
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388 # Remove a trailing slash |
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389 _mountpoint="${_mountpoint%/}" |
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390 if [ -z "${_mountpoint}" ]; then |
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391 echo "ERROR: would mount over the root filesystem" >&2 |
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392 return 1 |
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393 fi |
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394 |
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395 _rootds_mountpoint="$(zfs list -H -o mountpoint -t filesystem "${_dsname}")" || \ |
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396 { echo "ERROR: root dataset does not exist" >&2; return 1; } |
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397 |
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398 zfs list -H -o name,mountpoint,canmount,mounted -s mountpoint -t filesystem -r "${_dsname}" | \ |
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399 while IFS=$'\t' read -r _name _mp _canmount _mounted ; do |
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400 # Skip filesystems that are already mounted |
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401 [ "${_mounted}" = "yes" ] && continue |
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402 # Skip filesystems that must not be mounted |
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403 [ "${_canmount}" = "off" ] && continue |
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404 case "${_mp}" in |
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405 "none"|"legacy") |
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406 # Do nothing for filesystem with unset or legacy mountpoints |
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407 ;; |
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408 "${_rootds_mountpoint}"|"${_rootds_mountpoint}/"*) |
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409 # |
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410 # Handle only mountpoints that have a mountpoint below |
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411 # the parent datasets mountpoint |
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412 # |
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413 |
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414 # Determine the mountpoint relative to the parent mountpoint |
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415 _relative_mp="${_mp#${_rootds_mountpoint}}" |
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416 # Remove a trailing slash |
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417 _relative_mp="${_relative_mp%/}" |
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418 _real_mp="${_mountpoint}${_relative_mp}" |
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419 if [ "${_dry_run}" = "yes" ]; then |
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420 echo "Would mount ${_name} on ${_real_mp}" |
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421 else |
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422 mkdir -p "${_real_mp}" 1> /dev/null 2> /dev/null || \ |
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423 { echo "ERROR: cannot create mountpoint ${_real_mp}" >&2; return 1; } |
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424 echo "Mounting ${_name} on ${_real_mp}" |
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425 mount -t zfs "${_name}" "${_real_mp}" || return 1 |
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426 fi |
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427 ;; |
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428 *) |
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429 # XXX FIXME Option to do a zfs mount $_name ??? |
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430 echo "Skipping ${_name} because its configured mountpoint is not relative to given root dataset" 2>&1 |
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431 ;; |
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432 esac |
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433 done |
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434 |
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435 return 0 |
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436 } |
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437 |
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438 |
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439 # |
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440 # "umount" -- Recursively unmount ZFS datasets |
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441 # |
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442 # command_umount dataset |
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443 # |
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444 command_umount() { |
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445 local _dsname |
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446 local _name _mp _rest |
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447 local _rootds_mountpoint |
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448 |
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449 _dsname="${1-}" |
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450 [ -z "${_dsname}" ] && \ |
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451 { echo "ERROR: no dataset given" >&2; return 2; } |
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452 |
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453 # Just determine whether the given dataset name exists |
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454 _rootds_mountpoint="$(zfs list -H -o mountpoint -t filesystem "${_dsname}")" | return 1 |
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455 |
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456 mount -t zfs -p | \ |
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457 grep -E "^${_dsname}(/|\s)" | \ |
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458 sort -n -r | \ |
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459 while IFS=' '$'\t' read -r _name _mp _rest ; do |
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460 echo "Umounting ${_name} on ${_mp}" |
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461 umount "${_mp}" || return 1 |
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462 done |
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463 return 0 |
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464 } |
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465 |
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466 |
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467 # |
| 73 | 468 # "privs" -- adjust privileges |
| 469 # | |
| 470 # To be used when all ZFS datasets are mounted. | |
| 471 # | |
| 472 command_privs() { | |
| 473 # mountpoint | |
|
162
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474 local _mp _d _veds _get _vestatus |
| 73 | 475 |
| 476 _mp="$1" | |
| 477 if [ -z "${_mp}" ]; then | |
| 478 echo "ERROR: no mountpoint given" >&2 | |
| 479 return 2 | |
| 480 fi | |
| 481 if [ ! -d "${_mp}" ]; then | |
| 482 echo "ERROR: directory \`${_mp}' does not exist" >&2 | |
| 483 return 1 | |
| 484 fi | |
| 485 for _d in tmp var/tmp ; do | |
| 486 chmod 01777 "${_mp}/${_d}" | |
| 487 done | |
| 488 chown root:mail "${_mp}/var/mail" | |
| 489 chmod 0775 "${_mp}/var/mail" | |
|
162
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490 |
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491 # |
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492 # Handle <mountpoint>/var/empty specially: |
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493 # make it writeable temporarily if it is mounted read-only: |
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494 # |
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495 _vestatus="" |
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496 _veds="$(_get_dataset_for_varempty "${_mp}")" |
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497 if [ $? -eq 0 ]; then |
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498 _get=$(zfs get -H readonly ${_veds} 2>/dev/null) || { echo "ERROR: cannot determine readonly status of ${_mp}/var/empty" >&2; return 1; } |
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499 IFS=$'\t' read _dummy _dummy _vestatus _dummy <<EOF |
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500 ${_get} |
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501 EOF |
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502 if [ "${_vestatus}" = "on" ]; then |
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503 zfs set readonly=off ${_veds} >/dev/null 2>/dev/null || { echo "ERROR: cannot reset readonly-status of ${_mp}/var/empty" >&2; return 1; } |
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504 fi |
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505 fi |
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506 # Set the access rights and the file flags as given in mtree |
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507 chmod 0555 "${_mp}/var/empty" || { echo "WARNING: Cannot chmod on var/empty" >&2; } |
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508 chflags schg "${_mp}/var/empty" || { echo "WARNING: Cannot chflags on var/empty" >&2; } |
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509 # Reset the read-only status of the mountpoint as it was before |
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510 if [ "${_vestatus}" = "on" ]; then |
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511 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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512 fi |
| 73 | 513 } |
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514 |
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515 |
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516 # |
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517 # Global option handling |
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518 # |
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519 while getopts "Vh" _opt ; do |
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520 case ${_opt} in |
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521 V) |
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522 printf 'fjail v%s (rv:%s)\n' "${VERSION}" '@@HGREVISION@@' |
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523 exit 0 |
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524 ;; |
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525 h) |
| 75 | 526 echo "${USAGE}" |
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527 exit 0 |
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528 ;; |
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529 \?) |
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530 exit 2; |
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531 ;; |
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532 *) |
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533 echo "ERROR: option handling failed" >&2 |
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534 exit 2 |
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535 ;; |
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536 esac |
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537 done |
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538 |
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539 # |
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540 # Reset the Shell's option handling system to prepare for handling |
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541 # command-local options. |
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542 # |
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543 shift $((OPTIND-1)) |
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544 OPTIND=1 |
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545 |
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546 test $# -gt 0 || { echo "ERROR: no command given" >&2; exit 2; } |
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547 |
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548 command="$1" |
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549 shift |
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550 |
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551 case "${command}" in |
| 73 | 552 datasets) |
| 553 command_datasets "$@" | |
| 554 ;; | |
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555 mount) |
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556 command_mount "$@" |
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557 ;; |
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558 umount|unmount) |
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559 command_umount "$@" |
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560 ;; |
| 73 | 561 privs) |
| 562 command_privs "$@" | |
| 563 ;; | |
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564 populate) |
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565 command_populate "$@" |
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566 ;; |
|
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567 copy) |
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568 command_copy "$@" |
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569 ;; |
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570 *) |
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571 echo "ERROR: unknown command \`${command}'" >&2 |
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572 exit 2 |
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573 ;; |
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574 esac |