iankelling.org Git - automated-distro-installer/blob - fai/config/distro-install-common/ethusb-static

   1 #!/bin/bash
   2 # I, Ian Kelling, follow the GNU license recommendations at
   3 # https://www.gnu.org/licenses/license-recommendations.en.html. They
   4 # recommend that small programs, < 300 lines, be licensed under the
   5 # Apache License 2.0. This file contains or is part of one or more small
   6 # programs. If a small program grows beyond 300 lines, I plan to switch
   7 # its license to GPL.
   8
   9 # Copyright 2024 Ian Kelling
  10
  11 # Licensed under the Apache License, Version 2.0 (the "License");
  12 # you may not use this file except in compliance with the License.
  13 # You may obtain a copy of the License at
  14
  15 #     http://www.apache.org/licenses/LICENSE-2.0
  16
  17 # Unless required by applicable law or agreed to in writing, software
  18 # distributed under the License is distributed on an "AS IS" BASIS,
  19 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  20 # See the License for the specific language governing permissions and
  21 # limitations under the License.
  22
  23 # usage $0 [-c] [off]
  24 # off:   Turn off static ip.
  25 # -c    config only, don't tell networkmanager to change anything
  26 # -f    force interface reup
  27
  28 if ! test "$BASH_VERSION"; then echo "error: shell is not bash" >&2; exit 1; fi
  29 shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
  30 set -eE -o pipefail
  31 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
  32
  33 [[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
  34
  35 m() { printf "%s\n" "$*";  "$@"; }
  36
  37 ## begin arg parsing ##
  38
  39 force=false
  40 conf_only=false
  41 comment='# iank file id: ethusb-dhcp-v1'
  42 off=false
  43 while [[ $1 ]]; do
  44   case $1 in
  45     -c)
  46       conf_only=true
  47       ;;
  48     -f)
  49       force=true
  50       ;;
  51     off)
  52       off=true
  53       comment='# iank file id: ethusb-static-v1'
  54       ;;
  55     *)
  56       echo "$0: error unexpected argument: $1" >&2
  57       exit 1
  58       ;;
  59   esac
  60   shift
  61 done
  62
  63 ## end arg parsing ##
  64
  65
  66 shopt -s nullglob
  67
  68 # we already configured the interface once, afterwards, comment and
  69 # uncomment to enable/disable. This makes it so we don't depend on /p
  70 # being mounted.
  71
  72 conf=/etc/NetworkManager/system-connections/ethusb-static.nmconnection
  73 if ! $force && [[ -s $conf ]] && grep -qFx "$comment" $conf; then
  74   # we already ran successfully in the past to set things this way, so
  75   # do nothing.
  76   exit 0
  77 fi
  78
  79
  80 if [[ $(dig +short @10.2.0.1 -x 10.2.0.2 2>&1 ||:) == kd.b8.nz. ]] \
  81      && ip n show 10.2.0.1 | grep . &>/dev/null; then
  82   #  we are at_home=true
  83
  84   while read -r ip_suf host mac; do
  85     if [[ $mac != usb ]]; then
  86       continue
  87     fi
  88     if [[ $host == ${HOSTNAME}c ]]; then
  89
  90       net_info="address1=10.2.0.$ip_suf/16,10.2.0.1
  91 dns=8.8.8.4;8.8.8.8;"
  92
  93       break
  94     fi
  95   done </p/c/host-info
  96
  97   if [[ ! $ip_suf ]]; then
  98     echo "$0: error: failed to find ${HOSTNAME}c ip suffix in /p/c/host-info"
  99     exit 1
 100   fi
 101 else
 102   ip=$(getent ahostsv4 $HOSTNAME.office.fsf.org | awk '{ print $1 }' | head -n1)
 103   net_info="address1=$ip/24,192.168.0.1
 104 dns=192.168.0.10;192.168.0.25;"
 105 fi
 106
 107 wiredx=
 108
 109 # device that has an eth0, but we aren't using it because it is
 110 # broken. We could just hardcode a mac comparison with `cat
 111 # /sys/class/net/eth0/address` but this is cooler.
 112 if [[ -e  /sys/class/net/eth0 ]]; then
 113   bus_info=$(ethtool -i eth0 | awk '$1 == "bus-info:" { print $2 }')
 114   if [[ $bus_info != usb* ]]; then
 115     wiredx=2
 116   fi
 117 fi
 118
 119 ethx=$(( wiredx - 1 ))
 120
 121
 122
 123 uuid=$(nmcli con show "Wired connection $wiredx" 2>/dev/null | awk '$1 == "connection.uuid:" {print $2}' ||:)
 124 if [[ ! $uuid ]]; then
 125   # just a uuid that nm generated for me at some point
 126   uuid=0da4c614-6a3c-3ad2-8d4b-c6eebe0814c3
 127 fi
 128
 129
 130 # This template is the result of running, for example
 131 # nmcli con mod "Wired connection 1" \
 132   #       ipv4.addresses "10.2.0.23/24" \
 133   #       ipv4.gateway "10.2.0.1" \
 134   #       ipv4.dns "8.8.8.4,8.8.8.8"
 135
 136 # which creates a fille named "Wired connection 1.nmconnection",
 137 # below. I see no reason to keep the same file name, or a bunch of
 138 # setting that seem irrelevant, and empty sections don't seem to do
 139 # anything according to the man page.
 140
 141 # [connection]
 142 # id=Wired connection 2
 143 # uuid=b0fb7694-dfe6-31a1-81fa-7c17b61515a7
 144 # type=ethernet
 145 # interface-name=eth1
 146 # timestamp=1715728264
 147
 148 # [ethernet]
 149
 150 # [ipv4]
 151 # address1=10.2.0.23/16,10.2.0.1
 152 # dns=8.8.8.4;8.8.8.8;
 153 # method=manual
 154
 155 # [ipv6]
 156 # addr-gen-mode=stable-privacy
 157 # method=auto
 158
 159 # [proxy]
 160
 161 {
 162   cat <<EOF
 163 [connection]
 164 id=Wired connection $wiredx
 165 uuid=$uuid
 166 type=ethernet
 167 interface-name=eth$ethx
 168
 169 [ipv4]
 170 EOF
 171   if $off; then
 172     cat <<'EOF'
 173 method=auto
 174 EOF
 175   else
 176     cat <<EOF
 177 $net_info
 178 method=manual
 179 EOF
 180   fi
 181 } | install -T -m0600 /dev/stdin $conf
 182
 183 if ! $conf_only; then
 184   state=$(nmcli con show $uuid 2>/dev/null | awk '$1 == "GENERAL.STATE:" {print $2}' ||:)
 185
 186   reup=false
 187   if [[ $state == activated ]]; then
 188     reup=true
 189   fi
 190
 191   m nmcli con reload
 192
 193   if $reup; then
 194     m nmcli con down $uuid
 195     m nmcli con up $uuid
 196   fi
 197 fi
 198
 199 if ! grep -F "$comment" $conf; then
 200   printf "%s\n" "$comment" >>$conf
 201 fi