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#!/bin/bash
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#
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# Copyright (C) 2011 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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SOCAT="$1"
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INSTANCE="$2"
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MONITOR="$3"
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PARAMS="$4"
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CONSOLE="$5"
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unpause() {
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  echo "info status" |
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    "$SOCAT" STDIO "UNIX-CONNECT:$MONITOR" 2>/dev/null |
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    grep -q '^VM status: paused' || return
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  # As there is no way to be sure when the main socat has actually connected to
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  # the instance console, sleep for a few seconds before unpausing the
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  # instance. This is a tradeoff between missing some console output if the
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  # node is overloaded and making the user wait everytime when the node isn't
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  # so busy.
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  sleep 3
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  # Send \r\n after notice as terminal is in raw mode
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  printf "Instance $INSTANCE is paused, unpausing\r\n"
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  echo "c" | "$SOCAT" STDIO "UNIX-CONNECT:$MONITOR" &>/dev/null
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}
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unpause &
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exec "$SOCAT" "$PARAMS" "$CONSOLE"