Mercurial > hgrepos > FreeBSD > ports > sysutils > local-bsdtools
annotate sbin/fjail @ 178:00fbf2b4b44f
Allow to copy ZFS datasets in "raw" mode (with "-Lec" set)
| author | Franz Glasner <hg@dom66.de> |
|---|---|
| date | Tue, 16 Aug 2022 11:51:05 +0200 |
| parents | 9ffbe53dbc35 |
| children | 6c144aca8ac5 |
| 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 |
| 75 | 38 -u Do not automatically mount newly created datasets |
| 39 | |
| 40 privs MOUNTPOINT | |
| 41 | |
| 42 Adjust some Unix privileges to mounted jail datasets | |
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43 |
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44 populate MOUNTPOINT BASETXZ |
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45 |
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46 Populate the jail directory in MOUNTPOINT with the base system in BASETXZ |
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47 |
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48 copy SOURCE-DATASET DEST-DATASET |
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49 |
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50 Copy a tree of ZFS datasets with "zfs send -R" and "zfs receive". |
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51 Note that the destination dataset must not exist already. |
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52 |
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53 -r Copy the datasets with the -Lec options (aka "raw") |
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54 -u Do not automatically mount received datasets |
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55 |
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56 ENVIRONMENT: |
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57 |
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58 All environment variables that affect "zfs" are effective also. |
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59 |
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60 DESCRIPTION: |
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61 |
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62 All commands with the exception of "populate" require ZFS as |
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63 filesystem. |
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64 ' |
| 75 | 65 |
| 66 | |
| 73 | 67 # Reset to standard umask |
| 68 umask 0022 | |
| 69 | |
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70 |
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71 _get_dataset_for_mountpoint() { |
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72 : 'Use `zfs mount` to determine the ZFS dataset for a given mountpoint. |
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73 |
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74 ' |
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75 local _mountpoint |
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76 local _ds _mount |
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77 |
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78 _mountpoint="$1" |
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79 |
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80 while read -r _ds _mount; do |
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81 if [ "$_mount" = "$_mountpoint" ]; then |
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82 echo $_ds |
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83 return 0 |
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84 fi |
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85 done <<EOF__GDSFM |
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86 $(zfs mount) |
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87 EOF__GDSFM |
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88 return 1 |
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89 } |
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90 |
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91 |
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92 _get_dataset_for_varempty() { |
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93 : 'Allow special handling for <mountpoint>/var/empty which may be |
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94 mounted read-only. |
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95 |
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96 ' |
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97 local _mountpoint |
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98 local _ve_mount |
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99 |
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100 _mountpoint="$1" |
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101 |
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102 if [ "$_mountpoint" = '/' ]; then |
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103 _ve_mount='/var/empty' |
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104 else |
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105 _ve_mount="${_mountpoint}/var/empty" |
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106 fi |
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107 |
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108 _get_dataset_for_mountpoint "${_ve_mount}" |
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109 } |
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110 |
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111 |
| 73 | 112 # |
| 113 # "datasets" -- create the ZFS dataset tree | |
| 114 # | |
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115 # command_datasets [ -u ] parent-dataset child-dataset |
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116 # |
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117 # -u do not automatically mount newly created datasets |
| 73 | 118 # |
| 119 command_datasets() { | |
| 120 # parent ZFS dataset -- child ZFS dataset name | |
| 121 local _pds _cds | |
| 122 # and its mount point | |
| 123 local _pmp _get _dummy | |
| 124 # full name of the dataset | |
| 125 local _ds | |
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126 # dynamic ZFS options -- create cache for freebsd-update |
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127 local _zfsopts _fbsdupdate |
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128 |
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129 _zfsopts="" |
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130 _fbsdupdate="" |
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131 while getopts "us" _opt ; do |
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132 case ${_opt} in |
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133 u) |
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134 # do not mount newly created datasets |
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135 _zfsopts="${_zfsopts} -u" |
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136 ;; |
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137 s) |
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138 # create also a dataset for freebsd-update data |
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139 _fbsdupdate="yes" |
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140 \?|:) |
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141 return 2; |
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142 ;; |
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143 esac |
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144 done |
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145 shift $((OPTIND-1)) |
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146 OPTIND=1 |
| 73 | 147 |
| 148 _pds="$1" | |
| 149 if [ -z "${_pds}" ]; then | |
| 150 echo "ERROR: no parent dataset given" >&2 | |
| 151 return 2 | |
| 152 fi | |
| 153 _get=$(zfs get -H mountpoint "${_pds}" 2>/dev/null) || { echo "ERROR: dataset \`${_pds}' does not exist" >&2; return 1; } | |
| 154 IFS=$'\t' read _dummy _dummy _pmp _dummy <<EOF | |
| 155 ${_get} | |
| 156 EOF | |
| 157 case "${_pmp}" in | |
| 158 none) | |
| 159 echo "ERROR: dataset \`${_pds}' has no mountpoint" >&2 | |
| 160 return 1 | |
| 161 ;; | |
| 162 legacy) | |
| 163 echo "ERROR: dataset \`${_pds}' has a \`${_mp}' mountpoint" >&2 | |
| 164 return 1 | |
| 165 ;; | |
| 166 *) | |
| 167 # VOID | |
| 168 ;; | |
| 169 esac | |
| 170 _cds="$2" | |
| 171 if [ -z "${_cds}" ]; then | |
| 172 echo "ERROR: no child dataset given" >&2 | |
| 173 return 2 | |
| 174 fi | |
| 175 _ds="${_pds}/${_cds}" | |
| 176 echo "Resulting new root dataset is \`${_ds}' at mountpoint \`${_pmp}/${_cds}'" | |
| 177 if zfs get -H mountpoint "${_ds}" >/dev/null 2>/dev/null; then | |
| 178 echo "ERROR: dataset \`${_ds}' does already exist" >&2 | |
| 179 return 1 | |
| 180 fi | |
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181 zfs create ${_zfsopts} -o atime=off "${_ds}" |
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182 zfs create ${_zfsopts} -o sync=disabled -o setuid=off "${_ds}/tmp" |
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183 zfs create ${_zfsopts} "${_ds}/usr" |
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174
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184 zfs create ${_zfsopts} -o setuid=off "${_ds}/usr/home" |
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157
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185 zfs create ${_zfsopts} "${_ds}/usr/local" |
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186 zfs create ${_zfsopts} "${_ds}/var" |
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187 zfs create ${_zfsopts} -o exec=off -o setuid=off "${_ds}/var/audit" |
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188 zfs create ${_zfsopts} -o exec=off -o setuid=off "${_ds}/var/cache" |
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176
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189 zfs create ${_zfsopts} -o exec=off -o setuid=off -o primarycache=metadata -o compression=off "${_ds}/var/cache/pkg" |
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190 zfs create ${_zfsopts} -o exec=off -o setuid=off -o compression=off "${_ds}/var/crash" |
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191 if [ "$_fbsdupdate" = "yes" ]; then |
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192 zfs create ${_zfsopts} -o exec=off -o setuid=off -o primarycache=metadata -o compression=off "${_ds}/var/db/freebsd-update" |
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193 fi |
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194 zfs create ${_zfsopts} -o readonly=on -o exec=off -o setuid=off "${_ds}/var/empty" |
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195 zfs create ${_zfsopts} -o exec=off -o setuid=off -o primarycache=metadata "${_ds}/var/log" |
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196 zfs create ${_zfsopts} -o exec=off -o setuid=off -o atime=on "${_ds}/var/mail" |
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197 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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198 zfs create ${_zfsopts} -o sync=disabled -o setuid=off "${_ds}/var/tmp" |
| 73 | 199 } |
| 200 | |
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201 |
| 73 | 202 # |
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203 # "populate" -- populate the datasets with content from a FreeBSD base.txz |
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204 # |
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205 # command_populate mountpoint basetxz |
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206 # |
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207 command_populate() { |
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208 # MOUNTPOINT -- base.txz |
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209 local _mp _basetxz |
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210 |
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211 _mp="$1" |
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212 _basetxz="$2" |
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213 |
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214 if [ -z "${_mp}" ]; then |
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215 echo "ERROR: no mountpoint given" >&2 |
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216 return 2 |
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217 fi |
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218 if [ -z "${_basetxz}" ]; then |
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219 echo "ERROR: no base.txz given" >&2 |
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220 return 2 |
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221 fi |
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222 if [ ! -d "${_mp}" ]; then |
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223 echo "ERROR: mountpoint \`${_mp}' does not exist" >&2 |
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224 return 1 |
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225 fi |
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226 if [ ! -r "${_basetxz}" ]; then |
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227 echo "ERROR: file \`${_basetxz}' is not readable" >&2 |
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228 return 1 |
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229 fi |
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230 |
|
173
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231 # |
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232 # Handle /var/empty separately later: could be already there and |
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233 # mounted read-only. |
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234 # |
|
164
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235 tar -C "${_mp}" --exclude=./var/empty -xJp -f "${_basetxz}" || { echo "ERROR: tar encountered errors" >&2; return 1; } |
|
173
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236 if [ -d "${_mp}/var/empty" ]; then |
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237 # |
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238 # If /var/empty exists already try to extract with changing the |
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239 # flags (e.g. `schg'). But be tolerant with errors here. |
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240 # |
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241 tar -C "${_mp}" -xJp -f "${_basetxz}" ./var/empty |
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242 else |
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243 # Just extract /var/empty normally |
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244 tar -C "${_mp}" -xJp -f "${_basetxz}" ./var/empty || { echo "ERROR: tar encountered errors" >&2; return 1; } |
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245 fi |
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246 |
|
164
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247 find "${_mp}/boot" -type f -delete |
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248 } |
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249 |
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250 |
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251 # |
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252 # "copy" -- ZFS copy of datasets |
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253 # |
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254 # command_copy source-dataset destination-dataset |
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255 # |
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256 command_copy() { |
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257 # source dataset -- destination dataset |
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258 local _source _dest |
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259 # dynamic ZFS options -- ZFS copy options |
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260 local _zfsopts _zfscopyopts |
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261 |
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262 _zfsopts="" |
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263 _zfscopyopts="" |
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264 while getopts "ru" _opt ; do |
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265 case ${_opt} in |
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266 r) |
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267 # Use raw datasets |
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268 _zfscopyopts="-Lec" |
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269 u) |
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270 # do not mount newly created datasets |
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271 _zfsopts="${_zfsopts} -u" |
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272 ;; |
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273 \?|:) |
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274 return 2; |
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275 ;; |
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276 esac |
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277 done |
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278 shift $((OPTIND-1)) |
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279 OPTIND=1 |
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280 |
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281 _source="$1" |
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282 if [ -z "${_source}" ]; then |
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283 echo "ERROR: no source dataset given" >&2 |
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284 return 2 |
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285 fi |
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286 _dest="$2" |
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287 if [ -z "${_dest}" ]; then |
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288 echo "ERROR: no source dataset given" >&2 |
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289 return 2 |
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290 fi |
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291 zfs send -R ${_zfscopyopts} -n -v "${_source}" || { echo "ERROR: ZFS operation failed in no-op mode" >&2; return 1; } |
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292 zfs send -R ${_zfscopyopts} "${_source}" | zfs receive ${_zfsopts} "${_dest}" || { echo "ERROR: ZFS operation failed" >&2; return 1; } |
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293 } |
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294 |
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295 |
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296 # |
| 73 | 297 # "privs" -- adjust privileges |
| 298 # | |
| 299 # To be used when all ZFS datasets are mounted. | |
| 300 # | |
| 301 command_privs() { | |
| 302 # mountpoint | |
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303 local _mp _d _veds _get _vestatus |
| 73 | 304 |
| 305 _mp="$1" | |
| 306 if [ -z "${_mp}" ]; then | |
| 307 echo "ERROR: no mountpoint given" >&2 | |
| 308 return 2 | |
| 309 fi | |
| 310 if [ ! -d "${_mp}" ]; then | |
| 311 echo "ERROR: directory \`${_mp}' does not exist" >&2 | |
| 312 return 1 | |
| 313 fi | |
| 314 for _d in tmp var/tmp ; do | |
| 315 chmod 01777 "${_mp}/${_d}" | |
| 316 done | |
| 317 chown root:mail "${_mp}/var/mail" | |
| 318 chmod 0775 "${_mp}/var/mail" | |
|
162
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319 |
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320 # |
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321 # Handle <mountpoint>/var/empty specially: |
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322 # make it writeable temporarily if it is mounted read-only: |
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323 # |
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324 _vestatus="" |
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325 _veds=$(_get_dataset_for_varempty "${_mp}") |
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326 if [ $? -eq 0 ]; then |
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327 _get=$(zfs get -H readonly ${_veds} 2>/dev/null) || { echo "ERROR: cannot determine readonly status of ${_mp}/var/empty" >&2; return 1; } |
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328 IFS=$'\t' read _dummy _dummy _vestatus _dummy <<EOF |
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329 ${_get} |
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330 EOF |
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331 if [ "${_vestatus}" = "on" ]; then |
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332 zfs set readonly=off ${_veds} >/dev/null 2>/dev/null || { echo "ERROR: cannot reset readonly-status of ${_mp}/var/empty" >&2; return 1; } |
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333 fi |
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334 fi |
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335 # Set the access rights and the file flags as given in mtree |
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336 chmod 0555 "${_mp}/var/empty" |
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337 chflags schg "${_mp}/var/empty" |
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338 # Reset the read-only status of the mountpoint as it was before |
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339 if [ "${_vestatus}" = "on" ]; then |
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340 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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341 fi |
| 73 | 342 } |
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343 |
|
74
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344 |
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345 # |
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346 # Global option handling |
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347 # |
|
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348 while getopts "Vh" _opt ; do |
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349 case ${_opt} in |
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350 V) |
|
144
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351 printf 'fjail v%s (rv:%s)\n' "${VERSION}" '@@HGREVISION@@' |
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352 exit 0 |
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353 ;; |
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354 h) |
| 75 | 355 echo "${USAGE}" |
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356 exit 0 |
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357 ;; |
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80
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358 \?) |
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359 exit 2; |
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360 ;; |
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361 *) |
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362 echo "ERROR: option handling failed" >&2 |
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363 exit 2 |
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364 ;; |
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365 esac |
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366 done |
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367 |
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368 # |
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369 # Reset the Shell's option handling system to prepare for handling |
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370 # command-local options. |
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371 # |
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372 shift $((OPTIND-1)) |
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373 OPTIND=1 |
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374 |
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375 test $# -gt 0 || { echo "ERROR: no command given" >&2; exit 2; } |
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376 |
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377 command="$1" |
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378 shift |
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379 |
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380 case "${command}" in |
| 73 | 381 datasets) |
| 382 command_datasets "$@" | |
| 383 ;; | |
| 384 privs) | |
| 385 command_privs "$@" | |
| 386 ;; | |
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387 populate) |
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388 command_populate "$@" |
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389 ;; |
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390 copy) |
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391 command_copy "$@" |
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392 ;; |
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393 *) |
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394 echo "ERROR: unknown command \`${command}'" >&2 |
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff
changeset
|
395 exit 2 |
|
929051be7845
Begin a simple (ZFS-related) jail setup tool
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff
changeset
|
396 ;; |
|
929051be7845
Begin a simple (ZFS-related) jail setup tool
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff
changeset
|
397 esac |