scripts/trigger-rcmd

   1 #!/bin/sh
   2 #
   3 # trigger-rcmp: Trigger remote commands
   4 # Copyright (c)2014-2016 Alexander Barton (alex@barton.de)
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10 # Please read the file COPYING, README and AUTHORS for more information.
  11 #
  12
  13 NAME=$(basename "$0")
  14 RCMD_D="/usr/local/etc/rcmd.d"
  15
  16 PATH="$PATH:/usr/local/sbin:/usr/sbin"
  17
  18 do_help() {
  19         echo "Usage: $0 [--no-wake|-n] <rcmd> [<rcmd> [...]]" >&2
  20         exit 2
  21 }
  22
  23 do_rcmd() {
  24         SYSTEM="localhost"
  25         IFACE="eth0"
  26         CMD="uptime"
  27         TIMEOUT="300"
  28         SSH_CHECKS="6"
  29         WAKE_DELAY="10s"
  30         BOOT_DELAY="1m"
  31         SHUTDOWN_TIME="+10"
  32
  33         # Read in job/configuration file, but ignore shellcheck(1) warnings:
  34         # shellcheck disable=1090
  35         . "$cnf"
  36
  37         if [ $? -ne 0 ]; then
  38                 echo "$NAME: Failed to read \"$cnf\"!"
  39                 return 2
  40         fi
  41
  42         NAME="$NAME($1)"
  43
  44         echo "$NAME: Checking system \"$SYSTEM\" ..."
  45         fping -c1 -q "$SYSTEM" 2>/dev/null
  46         if [ $? -ne 0 ]; then
  47                 if [ -n "$NO_WAKE" ]; then
  48                         echo "$NAME: \"$SYSTEM\" seems to be down, skipping job."
  49                         return 9
  50                 fi
  51
  52                 echo "$NAME: \"$SYSTEM\" seems to be down, wake it up ..."
  53                 etherwake -b -i "$IFACE" "$(echo "$SYSTEM" | cut -d'.' -f1)"
  54                 if [ $? -ne 0 ]; then
  55                         echo "$NAME: Failed to wake \"$SYSTEM\"!" >&2
  56                         return 3
  57                 fi
  58                 echo "$NAME: Waiting for \"$SYSTEM\" to respond ..."
  59                 for i in $(seq 1 $TIMEOUT); do
  60                         fping -c1 -q "$SYSTEM" 2>/dev/null
  61                         [ $? -ne 0 ] || break
  62                         sleep 1s
  63                 done
  64                 fping -c1 -q "$SYSTEM" 2>/dev/null
  65                 if [ $? -ne 0 ]; then
  66                         echo "$NAME: Failed to wake \"$SYSTEM\"!" >&2
  67                         return 4
  68                 fi
  69                 sleep "$WAKE_DELAY"
  70                 rsys_was_running=0
  71         else
  72                 echo "$NAME: \"$SYSTEM\" is already alive, ok."
  73                 rsys_was_running=1
  74         fi
  75
  76         for i in $(seq 1 $SSH_CHECKS); do
  77                 echo "$NAME: Checking SSH connection ($i/$SSH_CHECKS) ..."
  78                 ssh -q "$SYSTEM" true >/dev/null 2>&1 && break
  79                 echo "$NAME: SSH on \"$SYSTEM\" not ready. Waiting ..."
  80                 sleep 10s
  81         done
  82         echo "$NAME: Ok, SSH seems to be available on \"$SYSTEM\"."
  83
  84         if [ "$rsys_was_running" -eq 0 ]; then
  85                 echo "$NAME: \"$SYSTEM\" just started up. Delaying actions for $BOOT_DELAY ..."
  86                 sleep "$BOOT_DELAY"
  87         fi
  88
  89         echo "$NAME: Calling \"$CMD\" on \"$SYSTEM\" ..."
  90         echo
  91
  92         # shellcheck disable=2029
  93         ssh -q "$SYSTEM" "$CMD" </dev/null ; r=$?
  94
  95         echo
  96         echo "$NAME: Remote command ended with return code $r."
  97         sleep 2
  98
  99         if [ "$rsys_was_running" -eq 0 ]; then
 100                 rsys_users=$(ssh -q "$SYSTEM" w | tail -n +3 | wc -l)
 101                 if [ "$rsys_users" = "0" ]; then
 102                         echo "$NAME: Power off \"$SYSTEM\" again ..."
 103                         # shellcheck disable=2029
 104                         ssh -q "$SYSTEM" "sync; shutdown -hP $SHUTDOWN_TIME" >/dev/null
 105                         if [ $? -ne 0 ]; then
 106                                 echo "$NAME: Failed to power off \"$SYSTEM\"!" >&2
 107                                 return 5
 108                         fi
 109                 else
 110                         echo "$NAME: Not shutting down \"$SYSTEM\", \c"
 111                         [ "$rsys_users" -eq 1 ] \
 112                                 && echo "There is 1 user logged in!" \
 113                                 || echo "There are $rsys_users users logged in!"
 114                 fi
 115         else
 116                 echo "$NAME: \"$SYSTEM\" was already alive, not shutting down."
 117         fi
 118         [ $r -eq 0 ] && return 0 || return 1
 119 }
 120
 121 # Defaults
 122 NO_WAKE=
 123
 124 # Check required tools
 125 for t in fping ssh etherwake; do
 126         if ! command -v "$t" >/dev/null 2>&1; then
 127                 echo "$NAME: Required tool \"$t\" missing, aborting!"
 128                 exit 3
 129         fi
 130 done
 131
 132 while [ $# -gt 0 ]; do
 133         case "$1" in
 134           --no-wake|-n)
 135                 NO_WAKE=1; ;;
 136           --help|-*)
 137                 do_help; ;;
 138           *)
 139                 break
 140         esac
 141         shift
 142 done
 143
 144 [ $# -gt 0 ] || do_help
 145
 146 result=0
 147 while [ $# -gt 0 ]; do
 148         cnf="$RCMD_D/$1"
 149         if [ ! -r "$cnf" ]; then
 150                 echo "$NAME: Can't read \"$cnf\"!"
 151                 r=1
 152         else
 153                 echo "$NAME: Working on \"$1\" - $(date "+%Y-%m-%d %H:%M:%S")"
 154                 do_rcmd "$1" ; r=$?
 155                 echo "$NAME: Done ($r) - $(date "+%Y-%m-%d %H:%M:%S")"
 156         fi
 157         [ $r -ne 0 ] && result=1
 158         shift
 159         [ $# -gt 0 ] && echo
 160 done
 161 exit $result