1 | #!/bin/sh |
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2 | # |
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3 | # Change the IP/hostname on cluster machines |
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4 | # |
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5 | |
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6 | # Required for recovery-mode scripts |
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7 | if [ "$1" = "test" ]; then |
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8 | echo "Change IP address or hostname" |
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9 | exit 0 |
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10 | fi |
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11 | |
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12 | if [ "$(id -u)" != "0" ]; then |
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13 | echo "This script must be run as root." |
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14 | exit 0 |
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15 | fi |
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16 | |
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17 | |
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18 | # Blatantly stolen from the installer |
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19 | ask() { |
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20 | answer='' |
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21 | while [ y != "$answer" -a n != "$answer" ]; do |
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22 | echo -n "$1" |
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23 | read answer |
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24 | [ Y = answer ] && answer=y |
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25 | [ N = answer ] && answer=n |
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26 | [ -z "$answer" ] && answer=$2 |
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27 | done |
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28 | } |
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29 | |
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30 | bail() { |
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31 | echo |
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32 | echo "Cancelled. Press Enter to the menu." |
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33 | read dummy |
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34 | exit 0; |
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35 | } |
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36 | |
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37 | # Precise mounts root read-only in recovery mode. |
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38 | mount -o remount,rw / |
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39 | |
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40 | # sulogin gets upset if it gets a ^C |
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41 | trap bail INT |
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42 | |
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43 | PATH="/sbin:/bin:/usr/bin:/usr/sbin:$PATH" |
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44 | |
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45 | if [ "$DEBATHENA_DEBUG" = "1" ]; then |
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46 | echo "**********\nDEBUG MODE\n**********" |
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47 | MASKS="$(pwd)/masks"; |
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48 | NETPARAMS="$(pwd)/netparams"; |
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49 | . "$(pwd)/require_network.sh" |
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50 | else |
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51 | MASKS="/usr/share/debathena-recovery-mode-config/masks"; |
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52 | NETPARAMS="/usr/share/debathena-recovery-mode-config/netparams"; |
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53 | . /usr/share/debathena-recovery-mode-config/require_network.sh |
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54 | fi |
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55 | |
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56 | if [ "$DEBATHENA_DEBUG" != "1" ] && \ |
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57 | [ "$(machtype -L)" != "debathena-cluster" ]; then |
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58 | echo "WARNING: This script is designed for debathena-cluster machines" |
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59 | echo "but this machine is running $(machtype -L).\n"; |
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60 | ask "Are you SURE you want to continue? (y/N) " n |
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61 | if [ "$answer" = "n" ]; then |
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62 | exit 0 |
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63 | fi |
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64 | fi |
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65 | |
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66 | echo "Testing networking, please wait..." |
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67 | if ! require_network; then |
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68 | echo "Can't verify that networking is available. If you continue," |
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69 | ask "errors may occur. Continue? (y/N) " n |
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70 | if [ "$answer" = "n" ]; then |
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71 | exit 0 |
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72 | fi |
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73 | fi |
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74 | |
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75 | while true; do |
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76 | while [ -z "$IPADDR" ] ; do |
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77 | echo -n "Enter IP address: " |
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78 | read IPADDR |
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79 | done |
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80 | |
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81 | NETMASK=`$NETPARAMS -f $MASKS $IPADDR|cut -d\ -f 1` |
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82 | GATEWAY=`$NETPARAMS -f $MASKS $IPADDR|cut -d\ -f 4` |
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83 | |
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84 | echo "Address: $IPADDR" |
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85 | echo |
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86 | echo "Autoconfigured settings:" |
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87 | echo " Netmask: $NETMASK" |
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88 | echo " Gateway: $GATEWAY" |
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89 | echo |
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90 | ask "Is this correct? (Y/n) " y |
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91 | [ "$answer" = "y" ] || continue |
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92 | echo "Looking up hostname..."; |
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93 | FQDN="$(dig +short -x $IPADDR 2>/dev/null | sed -e 's/.$//')" |
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94 | if [ $? != 0 ]; then |
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95 | echo "Unable to look up hostname. You may enter it below" |
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96 | echo "but beware that typos may render your machine unusable." |
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97 | FQDN= |
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98 | while [ -z "$FQDN" ] ; do |
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99 | echo -n "Enter hostname: " |
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100 | read FQDN |
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101 | FQDN="$(echo $FQDN | tr -d ' ')" |
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102 | if echo "$FQDN" | egrep -qi "[^a-z0-9_-\.]"; then |
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103 | echo "Invalid characters in hostname, try again." |
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104 | FQDN= |
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105 | fi |
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106 | done |
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107 | fi |
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108 | if ! echo "$FQDN" | grep -qi "MIT.EDU$"; then |
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109 | FQDN="$FQDN.MIT.EDU" |
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110 | fi |
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111 | echo "Hostname: $FQDN" |
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112 | ask "Is this correct? (Y/n) " y |
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113 | if [ "$answer" = "y" ]; then |
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114 | break |
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115 | fi |
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116 | done |
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117 | HOSTNAME="$(echo "$FQDN" | cut -d. -f 1)" |
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118 | DOMAIN="$(echo "$FQDN" | sed 's/[^\.]*\.//')" |
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119 | if [ "$DEBATHENA_DEBUG" = "1" ]; then |
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120 | echo "$IPADDR $NETMASK $GATEWAY $HOSTNAME $DOMAIN $FQDN" |
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121 | echo "Done!" |
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122 | exit 0 |
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123 | fi |
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124 | echo "Updating /etc/network/interfaces..." |
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125 | mv -f "/etc/network/interfaces" "/etc/network/interfaces.old" |
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126 | cat <<EOF >/etc/network/interfaces |
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127 | # This file was created by athena-renumber |
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128 | |
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129 | # The loopback interface |
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130 | auto lo |
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131 | iface lo inet loopback |
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132 | |
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133 | # The primary network interface |
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134 | auto eth0 |
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135 | iface eth0 inet static |
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136 | address $IPADDR |
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137 | netmask $NETMASK |
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138 | gateway $GATEWAY |
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139 | dns-nameservers 18.70.0.160 18.71.0.151 18.72.0.3 |
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140 | dns-search mit.edu |
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141 | EOF |
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142 | echo "Updating /etc/hosts..." |
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143 | mv -f "/etc/hosts" "/etc/hosts.old" |
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144 | cat <<EOF >/etc/hosts |
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145 | # This file was created by athena-renumber |
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146 | 127.0.0.1 localhost |
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147 | 127.0.1.1 $fqdn $hostname |
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148 | |
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149 | # The following lines are desirable for IPv6 capable hosts |
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150 | ::1 localhost ip6-localhost ip6-loopback |
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151 | fe00::0 ip6-localnet |
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152 | ff00::0 ip6-mcastprefix |
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153 | ff02::1 ip6-allnodes |
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154 | ff02::2 ip6-allrouters |
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155 | ff02::3 ip6-allhosts |
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156 | EOF |
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157 | echo "Updating /etc/hostname..." |
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158 | mv -f /etc/hostname /etc/hostname.old |
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159 | echo $HOSTNAME > /etc/hostname |
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160 | echo "Setting hostname..."; |
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161 | hostname $HOSTNAME |
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162 | echo |
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163 | echo "Done! You will need to reboot the workstation for the changes to take effect." |
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164 | ask "Would you like to reboot now? (Y/n) " y |
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165 | if [ "$answer" = "n" ]; then |
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166 | echo "Please perform a full shutdown and reboot as soon as possible." |
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167 | echo "(Press Enter to return to the menu)" |
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168 | exit 0 |
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169 | fi |
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170 | reboot |
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