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50 lines
1009 B
Bash
Executable File
50 lines
1009 B
Bash
Executable File
#!/usr/bin/env bash
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#
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# Wait until a given host is down (determined by ping) then execute the
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# given command
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#
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# This script is based on the original work by Steve Kemp.
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# Original work Copyright (c) 2013 by Steve Kemp.
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#
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# The code in the original repository may be modified and distributed under your choice of:
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# * The Perl Artistic License (http://dev.perl.org/licenses/artistic.html) or
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# * The GNU General Public License, version 2 or later (http://www.gnu.org/licenses/gpl2.txt).
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#
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# Modifications and enhancements by Ismo Vuorinen on 2025.
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#
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# Usage:
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# ./when-down HOST COMMAND...
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#
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# Example
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# ./when-down 1.2.3.4 ssh 1.2.3.4
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#
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# Ensure we received the correct number of arguments.
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if [ "$#" -lt 2 ]; then
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echo "Usage: $0 HOST COMMAND..."
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exit 1
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fi
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wait_for_host_down()
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{
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local host=$1
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echo "Waiting for $host to go down..."
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while ping -c 1 -W 1 "$host" > /dev/null 2>&1; do
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sleep 1
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done
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}
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main()
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{
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local host=$1
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shift
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wait_for_host_down "$host"
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"$@"
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}
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main "$@"
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