1 | #!/bin/bash |
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2 | |
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3 | # |
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4 | # template script for generating Arch linux container for LXC |
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5 | # |
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6 | |
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7 | # |
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8 | # lxc: linux Container library |
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9 | |
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10 | # Authors: |
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11 | # Alexander Vladimirov <idkfa@vlan1.ru> |
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12 | |
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13 | # This library is free software; you can redistribute it and/or |
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14 | # modify it under the terms of the GNU Lesser General Public |
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15 | # License as published by the Free Software Foundation; either |
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16 | # version 2.1 of the License, or (at your option) any later version. |
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17 | |
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18 | # This library is distributed in the hope that it will be useful, |
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19 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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20 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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21 | # Lesser General Public License for more details. |
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22 | |
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23 | # You should have received a copy of the GNU Lesser General Public |
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24 | # License along with this library; if not, write to the Free Software |
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25 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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26 | |
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27 | # defaults |
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28 | arch=$(arch) |
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29 | cache=/var/cache/lxc/arch/${arch} |
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30 | lxc_network_type="veth" |
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31 | lxc_network_link="br0" |
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32 | default_path=/var/lib/lxc |
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33 | default_rc_locale="en-US.UTF-8" |
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34 | default_rc_timezone="UTC" |
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35 | host_mirror="http://mirrors.kernel.org/archlinux/\$repo/os/$arch" |
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36 | |
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37 | # sort of minimal package set |
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38 | base_packages=( |
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39 | "filesystem" |
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40 | "initscripts" |
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41 | "coreutils" |
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42 | "module-init-tools" |
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43 | "procps" |
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44 | "psmisc" |
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45 | "pacman" |
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46 | "bash" |
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47 | "syslog-ng" |
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48 | "cronie" |
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49 | "iproute2" |
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50 | "iputils" |
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51 | "inetutils" |
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52 | "dhcpcd" |
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53 | "dnsutils" |
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54 | "nano" |
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55 | "grep" |
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56 | "less" |
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57 | "gawk" |
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58 | "sed" |
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59 | "tar" |
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60 | "wget" |
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61 | "gzip" |
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62 | "which" |
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63 | ) |
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64 | declare -a additional_packages |
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65 | |
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66 | [ -f /etc/arch-release ] && is_arch=true |
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67 | |
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68 | # find and extract parameter value from given config file |
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69 | # ${1} - file to read parameter from |
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70 | # ${2} - parameter name |
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71 | # ${result} - result value on success |
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72 | function read_parameter_value { |
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73 | [ -f ${1} ] && [ "${2}" ] || return 1 |
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74 | local pattern="^[[:space:]]*${2}[[:space:]]*=[[:space:]]*" |
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75 | local str=$(grep "${pattern}" "${1}") |
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76 | local str=${str/#$(grep -o "${pattern}" "${1}")/} |
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77 | result=${str//\"/} |
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78 | return 0 |
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79 | } |
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80 | |
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81 | # split comma-separated string into an array |
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82 | # ${1} - string to split |
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83 | # ${2} - separator (default is ",") |
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84 | # ${result} - result value on success |
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85 | function split_string { |
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86 | local ifs=${IFS} |
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87 | IFS="${2:-,}" |
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88 | read -a result < <(echo "${1}") |
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89 | IFS=${ifs} |
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90 | return 0 |
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91 | } |
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92 | |
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93 | # Arch-specific preconfiguration for container |
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94 | function configure_arch { |
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95 | # read locale and timezone defaults from system rc.conf if running on Arch |
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96 | if [ "${is_arch}" ]; then |
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97 | read_parameter_value "/etc/rc.conf" "LOCALE" |
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98 | rc_locale=${result:-${default_rc_locale}} |
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99 | read_parameter_value "/etc/rc.conf" "TIMEZONE" |
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100 | rc_timezone=${result:-${default_rc_timezone}} |
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101 | else |
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102 | rc_locale=${default_rc_locale} |
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103 | rc_timezone=${default_rc_timezone} |
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104 | fi |
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105 | |
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106 | echo "Setting up rc.conf" |
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107 | cat > "${rootfs_path}/etc/rc.conf" << EOF |
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108 | # /etc/rc.conf - Main Configuration for Arch Linux |
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109 | LOCALE="${rc_locale}" |
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110 | DAEMON_LOCALE="no" |
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111 | HARDWARECLOCK="local" |
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112 | TIMEZONE="${rc_timezone}" |
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113 | KEYMAP=us |
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114 | CONSOLEFONT= |
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115 | CONSOLEMAP= |
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116 | USECOLOR="yes" |
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117 | MODULES=() |
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118 | HOSTNAME="${name}" |
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119 | interface=eth0 |
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120 | address= |
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121 | netmask= |
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122 | broadcast= |
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123 | gateway= |
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124 | DAEMONS=(syslog-ng crond network) |
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125 | EOF |
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126 | |
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127 | if [ -e "${rootfs_path}/etc/locale.gen" ]; then |
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128 | sed -i 's@^#\(en_US\.UTF-8\)@\1@' "${rootfs_path}/etc/locale.gen" |
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129 | if [ ! "${rc_locale}" = "en_US.UTF-8" ]; then |
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130 | echo "${rc_locale} ${rc_locale##*.}" >> "${rootfs_path}/etc/locale.gen" |
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131 | fi |
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132 | chroot "${rootfs_path}" locale-gen |
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133 | fi |
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134 | cp "${rootfs_path}/usr/share/zoneinfo/${rc_timezone}" \ |
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135 | "${rootfs_path}/etc/localtime" |
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136 | |
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137 | echo "Setting up rc.sysinit" |
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138 | cat > "${rootfs_path}/etc/rc.sysinit.lxc" << EOF |
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139 | #!/bin/bash |
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140 | . /etc/rc.conf |
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141 | . /etc/rc.d/functions |
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142 | |
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143 | echo "starting Arch Linux" |
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144 | rm -f \$(find /var/run -name '*pid') |
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145 | rm -f /run/daemons/* |
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146 | rm -f /var/lock/subsys/* |
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147 | rm -f /etc/mtab |
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148 | touch /etc/mtab |
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149 | run_hook sysinit_end |
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150 | EOF |
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151 | |
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152 | echo "Setting up rc.shutdown" |
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153 | cat > "${rootfs_path}/etc/rc.shutdown.lxc" << EOF |
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154 | #!/bin/bash |
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155 | . /etc/rc.conf |
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156 | . /etc/rc.d/functions |
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157 | stty onlcr |
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158 | run_hook shutdown_start |
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159 | [[ -x /etc/rc.local.shutdown ]] && /etc/rc.local.shutdown |
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160 | stop_all_daemons |
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161 | run_hook shutdown_prekillall |
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162 | kill_all |
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163 | run_hook shutdown_postkillall |
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164 | [[ \${TIMEZONE} ]] && cp --remove-destination "/usr/share/zoneinfo/\${TIMEZONE}" /etc/localtime |
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165 | halt -w |
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166 | umount -a -r -t nodevtmpfs,notmpfs,nosysfs,noproc,nodevpts -O no_netdev |
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167 | run_hook shutdown_postumount |
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168 | run_hook shutdown_poweroff |
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169 | if [[ \${RUNLEVEL} = 0 ]]; then |
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170 | poweroff -d -f -i |
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171 | else |
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172 | reboot -d -f -i |
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173 | fi |
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174 | # vim: set ts=2 sw=2 noet: |
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175 | EOF |
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176 | chmod 755 "${rootfs_path}/etc/rc.shutdown.lxc" "${rootfs_path}/etc/rc.sysinit.lxc" |
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177 | |
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178 | echo "Setting up inittab" |
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179 | cat > "${rootfs_path}/etc/inittab" << EOF |
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180 | id:3:initdefault: |
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181 | rc::sysinit:/etc/rc.sysinit.lxc |
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182 | rs:S1:wait:/etc/rc.single |
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183 | rm:2345:wait:/etc/rc.multi |
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184 | rh:06:wait:/etc/rc.shutdown.lxc |
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185 | su:S:wait:/sbin/sulogin -p |
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186 | c1:2345:respawn:/sbin/agetty -8 38400 tty1 linux |
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187 | EOF |
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188 | |
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189 | echo "Setting up hosts" |
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190 | cat > "${rootfs_path}/etc/hosts" << EOF |
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191 | 127.0.0.1 localhost.localdomain localhost ${name} |
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192 | ::1 localhost.localdomain localhost |
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193 | EOF |
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194 | |
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195 | echo "Setting up nameserver" |
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196 | grep nameserver /etc/resolv.conf > "${rootfs_path}/etc/resolv.conf" |
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197 | |
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198 | echo "Setting up device nodes" |
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199 | mkdir -m 755 "${rootfs_path}/dev/pts" |
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200 | mkdir -m 1777 "${rootfs_path}/dev/shm" |
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201 | mknod -m 666 "${rootfs_path}/dev/null" c 1 3 |
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202 | mknod -m 666 "${rootfs_path}/dev/full" c 1 7 |
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203 | mknod -m 666 "${rootfs_path}/dev/random" c 1 8 |
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204 | mknod -m 666 "${rootfs_path}/dev/urandom" c 1 9 |
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205 | mknod -m 666 "${rootfs_path}/dev/tty0" c 4 0 |
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206 | mknod -m 666 "${rootfs_path}/dev/tty1" c 4 1 |
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207 | mknod -m 666 "${rootfs_path}/dev/tty2" c 4 2 |
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208 | mknod -m 666 "${rootfs_path}/dev/tty3" c 4 3 |
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209 | mknod -m 666 "${rootfs_path}/dev/tty4" c 4 4 |
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210 | mknod -m 600 "${rootfs_path}/dev/initctl" p |
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211 | mknod -m 666 "${rootfs_path}/dev/tty" c 5 0 |
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212 | mknod -m 666 "${rootfs_path}/dev/console" c 5 1 |
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213 | mknod -m 666 "${rootfs_path}/dev/ptmx" c 5 2 |
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214 | |
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215 | return 0 |
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216 | } |
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217 | |
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218 | # write container configuration files |
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219 | function copy_configuration { |
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220 | mkdir -p "${config_path}" |
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221 | grep -q "^lxc.rootfs" "${config_path}/config" 2>/dev/null || echo "lxc.rootfs=${rootfs_path}" >> "${config_path}/config" |
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222 | cat > "${config_path}/config" << EOF |
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223 | lxc.utsname=${name} |
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224 | lxc.tty=4 |
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225 | lxc.pts=1024 |
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226 | lxc.mount=${config_path}/fstab |
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227 | #networking |
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228 | lxc.network.type=${lxc_network_type} |
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229 | lxc.network.flags=up |
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230 | lxc.network.link=${lxc_network_link} |
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231 | lxc.network.name=eth0 |
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232 | lxc.network.mtu=1500 |
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233 | #cgroups |
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234 | lxc.cgroup.devices.deny = a |
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235 | # /dev/null and zero |
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236 | lxc.cgroup.devices.allow = c 1:3 rwm |
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237 | lxc.cgroup.devices.allow = c 1:5 rwm |
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238 | # consoles |
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239 | lxc.cgroup.devices.allow = c 5:1 rwm |
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240 | lxc.cgroup.devices.allow = c 5:0 rwm |
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241 | lxc.cgroup.devices.allow = c 4:0 rwm |
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242 | lxc.cgroup.devices.allow = c 4:1 rwm |
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243 | # /dev/{,u}random |
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244 | lxc.cgroup.devices.allow = c 1:9 rwm |
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245 | lxc.cgroup.devices.allow = c 1:8 rwm |
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246 | # /dev/pts |
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247 | lxc.cgroup.devices.allow = c 136:* rwm |
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248 | lxc.cgroup.devices.allow = c 5:2 rwm |
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249 | # rtc |
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250 | lxc.cgroup.devices.allow = c 254:0 rwm |
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251 | EOF |
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252 | |
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253 | cat > "${config_path}/fstab" << EOF |
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254 | none ${rootfs_path}/dev/pts devpts defaults 0 0 |
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255 | none ${rootfs_path}/proc proc nodev,noexec,nosuid 0 0 |
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256 | none ${rootfs_path}/sys sysfs defaults 0 0 |
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257 | none ${rootfs_path}/dev/shm tmpfs defaults 0 0 |
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258 | EOF |
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259 | |
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260 | if [ ${?} -ne 0 ]; then |
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261 | echo "Failed to configure container" |
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262 | return 1 |
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263 | fi |
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264 | |
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265 | return 0 |
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266 | } |
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267 | |
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268 | # lock chroot and mount subdirectories before installing container |
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269 | function mount_chroot { |
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270 | echo "mounting chroot" |
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271 | umask 0022 |
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272 | [ -e "${rootfs_path}/sys" ] || mkdir "${rootfs_path}/sys" |
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273 | mount -t sysfs sysfs "${rootfs_path}/sys" |
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274 | [ -e "${rootfs_path}/proc" ] || mkdir "${rootfs_path}/proc" |
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275 | mount -t proc proc "${rootfs_path}/proc" |
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276 | [ -e "${rootfs_path}/dev" ] || mkdir "${rootfs_path}/dev" |
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277 | mount -t tmpfs dev "${rootfs_path}/dev" -o mode=0755,size=10M,nosuid |
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278 | mknod -m 666 "${rootfs_path}/dev/null" c 1 3 |
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279 | mknod -m 666 "${rootfs_path}/dev/zero" c 1 5 |
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280 | mknod -m 600 "${rootfs_path}/dev/console" c 5 1 |
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281 | mknod -m 644 "${rootfs_path}/dev/random" c 1 8 |
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282 | mknod -m 644 "${rootfs_path}/dev/urandom" c 1 9 |
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283 | mknod -m 666 "${rootfs_path}/dev/tty" c 5 0 |
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284 | mknod -m 666 "${rootfs_path}/dev/tty0" c 4 0 |
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285 | mknod -m 666 "${rootfs_path}/dev/full" c 1 7 |
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286 | ln -s /proc/kcore "${rootfs_path}/dev/core" |
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287 | ln -s /proc/self/fd "${rootfs_path}/dev/fd" |
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288 | ln -s /proc/self/fd/0 "${rootfs_path}/dev/stdin" |
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289 | ln -s /proc/self/fd/1 "${rootfs_path}/dev/stdout" |
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290 | ln -s /proc/self/fd/2 "${rootfs_path}/dev/stderr" |
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291 | [ -e "${rootfs_path}/dev/shm" ] || mkdir "${rootfs_path}/dev/shm" |
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292 | mount -t tmpfs shm "${rootfs_path}/dev/shm" -o nodev,nosuid,size=128M |
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293 | [ -e "${rootfs_path}/dev/pts" ] || mkdir "${rootfs_path}/dev/pts" |
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294 | mount -t devpts devpts "${rootfs_path}/dev/pts" -o newinstance,ptmxmode=666 |
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295 | ln -s pts/ptmx "${rootfs_path}/dev/ptmx" |
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296 | [ -e "${cache_dir}" ] || mkdir -p "${cache_dir}" |
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297 | [ -e "${rootfs_path}/${cache_dir}" ] || mkdir -p "${rootfs_path}/${cache_dir}" |
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298 | mount -o bind "${cache_dir}" "${rootfs_path}/${cache_dir}" |
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299 | if [ -n "${host_mirror_path}" ]; then |
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300 | [ -e "${rootfs_path}/${host_mirror_path}" ] || mkdir -p "${rootfs_path}/${host_mirror_path}" |
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301 | mount -o bind "${host_mirror_path}" "${rootfs_path}/${host_mirror_path}" |
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302 | mount -o remount,ro,bind "${host_mirror_path}" "${rootfs_path}/${host_mirror_path}" |
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303 | fi |
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304 | trap 'umount_chroot' EXIT INT QUIT TERM HUP |
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305 | } |
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306 | |
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307 | function umount_chroot { |
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308 | if [ -z "${umount_done}" ]; then |
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309 | echo "unmounting chroot" |
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310 | umount "${rootfs_path}/proc" |
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311 | umount "${rootfs_path}/sys" |
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312 | umount "${rootfs_path}/dev/pts" |
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313 | umount "${rootfs_path}/dev/shm" |
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314 | umount "${rootfs_path}/dev" |
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315 | umount "${rootfs_path}/${cache_dir}" |
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316 | [ -n "${host_mirror_path}" ] && umount "${rootfs_path}/${host_mirror_path}" |
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317 | umount_done=1 |
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318 | fi |
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319 | } |
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320 | |
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321 | # install packages within container chroot |
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322 | function install_arch { |
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323 | pacman_config=$(mktemp) |
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324 | |
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325 | cat <<EOF > "${pacman_config}" |
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326 | [options] |
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327 | HoldPkg = pacman glibc |
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328 | SyncFirst = pacman |
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329 | Architecture = auto |
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330 | #IgnorePkg = udev |
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331 | [core] |
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332 | Include = /etc/pacman.d/mirrorlist |
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333 | Server = ${host_mirror} |
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334 | [extra] |
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335 | Include = /etc/pacman.d/mirrorlist |
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336 | Server = ${host_mirror} |
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337 | [community] |
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338 | Include = /etc/pacman.d/mirrorlist |
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339 | Server = ${host_mirror} |
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340 | EOF |
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341 | |
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342 | mkdir -p "${rootfs_path}/var/lib/pacman/sync" |
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343 | mkdir -p "${rootfs_path}/etc" |
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344 | |
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345 | if echo "${host_mirror}" | grep -q 'file://'; then |
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346 | host_mirror_path=$(echo "${host_mirror}" | sed -E 's#file://(/.*)/\$repo/os/\$arch#\1#g') |
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347 | fi |
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348 | cache_dir=$( (grep -m 1 '^CacheDir' "${pacman_config}" || echo 'CacheDir = /var/cache/pacman/pkg') | sed 's/CacheDir\s*=\s*//') |
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349 | mount_chroot |
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350 | params="--root ${rootfs_path} --config=${pacman_config} --noconfirm" |
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351 | if ! pacman -Sydd ${params} --dbonly udev; then |
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352 | echo "Failed to preinstall udev package record" |
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353 | return 1 |
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354 | fi |
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355 | if ! pacman -S ${params} ${base_packages[@]}; then |
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356 | echo "Failed to install container packages" |
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357 | return 1 |
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358 | fi |
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359 | [ -d "${rootfs_path}/lib/modules" ] && ldconfig -r "${rootfs_path}" |
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360 | mv "${pacman_config}" "${rootfs_path}/etc/pacman.conf" |
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361 | umount_chroot |
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362 | return 0 |
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363 | } |
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364 | |
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365 | usage() |
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366 | { |
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367 | cat <<EOF |
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368 | usage: |
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369 | ${1} -n|--name=<container_name> |
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370 | [-P|--packages=<pkg1,pkg2,...>] [-p|--path=<path>] [-h|--help] |
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371 | Mandatory args: |
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372 | -n,--name container name, used to as an identifier for that container from now on |
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373 | Optional args: |
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374 | -p,--path path to where the container rootfs will be created, defaults to /var/lib/lxc. The container config will go under /var/lib/lxc in that case |
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375 | -P,--packages preinstall additional packages, comma-separated list |
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376 | -h,--help print this help |
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377 | EOF |
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378 | return 0 |
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379 | } |
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380 | |
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381 | options=$(getopt -o hp:P:n:cm: -l help,path:,packages:,name:,clean,mirror: -- "${@}") |
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382 | if [ ${?} -ne 0 ]; then |
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383 | usage $(basename ${0}) |
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384 | exit 1 |
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385 | fi |
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386 | eval set -- "${options}" |
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387 | |
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388 | while true |
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389 | do |
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390 | case "${1}" in |
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391 | -h|--help) usage ${0} && exit 0;; |
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392 | -p|--path) path=${2}; shift 2;; |
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393 | -n|--name) name=${2}; shift 2;; |
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394 | -P|--packages) additional_packages=${2}; shift 2;; |
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395 | -m|--mirror) host_mirror=${2}; shift 2;; |
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396 | --) shift 1; break ;; |
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397 | *) break ;; |
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398 | esac |
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399 | done |
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400 | |
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401 | if [ -z "${name}" ]; then |
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402 | echo "missing required 'name' parameter" |
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403 | exit 1 |
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404 | fi |
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405 | |
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406 | type pacman >/dev/null 2>&1 |
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407 | if [ ${?} -ne 0 ]; then |
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408 | echo "'pacman' command is missing, refer to wiki.archlinux.org for information about installing pacman" |
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409 | exit 1 |
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410 | fi |
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411 | |
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412 | if [ -z "${path}" ]; then |
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413 | path="${default_path}/${name}" |
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414 | fi |
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415 | |
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416 | if [ "${EUID}" != "0" ]; then |
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417 | echo "This script should be run as 'root'" |
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418 | exit 1 |
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419 | fi |
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420 | |
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421 | rootfs_path="${path}/rootfs" |
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422 | # check for 'lxc.rootfs' passed in through default config by lxc-create |
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423 | if grep -q '^lxc.rootfs' $path/config 2>/dev/null ; then |
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424 | rootfs_path=`grep 'lxc.rootfs =' $path/config | awk -F= '{ print $2 }'` |
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425 | fi |
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426 | config_path="${default_path}/${name}" |
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427 | |
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428 | revert() |
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429 | { |
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430 | echo "Interrupted, so cleaning up" |
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431 | lxc-destroy -n "${name}" |
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432 | # maybe was interrupted before copy config |
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433 | rm -rf "${path}/${name}" |
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434 | rm -rf "${default_path}/${name}" |
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435 | exit 1 |
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436 | } |
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437 | |
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438 | trap revert SIGHUP SIGINT SIGTERM |
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439 | |
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440 | copy_configuration |
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441 | if [ ${?} -ne 0 ]; then |
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442 | echo "failed write configuration file" |
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443 | rm -rf "${config_path}" |
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444 | exit 1 |
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445 | fi |
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446 | |
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447 | if [ ${#additional_packages[@]} -gt 0 ]; then |
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448 | split_string ${additional_packages} |
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449 | base_packages+=(${result[@]}) |
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450 | fi |
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451 | |
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452 | install_arch |
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453 | if [ ${?} -ne 0 ]; then |
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454 | echo "failed to install Arch linux" |
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455 | rm -rf "${config_path}" "${path}" |
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456 | exit 1 |
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457 | fi |
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458 | |
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459 | configure_arch |
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460 | if [ ${?} -ne 0 ]; then |
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461 | echo "failed to configure Arch linux for a container" |
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462 | rm -rf "${config_path}" "${path}" |
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463 | exit 1 |
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464 | fi |
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465 | |
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466 | echo "container rootfs and config created" |
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