103 lines
2.2 KiB
Bash
Executable File
103 lines
2.2 KiB
Bash
Executable File
#!/bin/sh
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#
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# multissh.sh, Copyright © 2013, 2019 Matteo Cypriani <mcy@lm7.fr>
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# (Formerly named cluster-run.sh)
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#
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# This program is free software. It comes without any warranty, to
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# the extent permitted by applicable law. You can redistribute it
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# and/or modify it under the terms of the Do What The Fuck You Want
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# To Public License, Version 2, as published by Sam Hocevar. See
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# http://sam.zoy.org/wtfpl/COPYING for more details.
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#
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# Run a command on a list of remote hosts using Parallel SSH.
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#set -x
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set -u
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# Exit codes
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readonly EXIT_SUCCESS=0
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readonly EXIT_USAGE=127
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readonly EXIT_HOSTS_LIST=6
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print_usage()
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{
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echo "Usage: $0 [-l login] <hosts_list> <command>"
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}
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bad_usage()
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{
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err "$@"
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echo >&2
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print_usage >&2
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exit $EXIT_USAGE
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}
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err()
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{
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printf 'Error! ' >&2
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printf '%s\n' "$@" >&2
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}
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warn()
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{
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printf 'Warning! ' >&2
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printf '%s\n' "$@" >&2
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}
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ssh_command()
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{
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grep -v '^#' "$HOSTS" | while read -r host ; do
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[ -z "$host" ] && continue
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echo "Executing command on '$host'..."
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# shellcheck disable=SC2086
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ssh ${LOGIN} "${host}" -- "$@" </dev/null
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# Note: </dev/null is to prevent ssh from swallowing stdin (see SC2095).
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done
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}
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# Do we have at least a host list and a command?
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[ $# -lt 2 ] && bad_usage "Wrong number of arguments."
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# Parse the optional arguments
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LOGIN=
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if [ "$1" = "-l" ] ; then
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LOGIN="$2"
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shift
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shift
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# Do we still have at least a host list and a command?
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[ $# -lt 2 ] && bad_usage "Wrong number of arguments."
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fi
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# Check dependencies
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PSSH=$(command -v parallel-ssh || command -v pssh)
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if [ -z "$PSSH" ] ; then
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warn "Parallel SSH (pssh) is not available. Install it for best results."
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fi
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# Hosts list file
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[ -z ${XDG_CONFIG_HOME+x} ] && XDG_CONFIG_HOME="$HOME/.config"
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HOSTS_LIST_NAME="$1"
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shift
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HOSTS="$XDG_CONFIG_HOME/ssh_tools/${HOSTS_LIST_NAME}.lst"
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echo "Using file '$HOSTS' as hosts list."
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if [ ! -f "$HOSTS" ] ; then
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err "The hosts list file doesn't exist or is not a regular file."
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exit $EXIT_HOSTS_LIST
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fi
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# Login
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if [ -n "$LOGIN" ] ; then
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echo "Login: $LOGIN"
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LOGIN="-l $LOGIN"
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fi
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echo "Command:" "$@"
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if [ -n "$PSSH" ] ; then
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# shellcheck disable=SC2086
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exec $PSSH --print $LOGIN -h "$HOSTS" -- "$@"
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else
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ssh_command "$@"
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fi
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