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#!/bin/bash
# parssh: Parallel SSH orchestration in a Bash session.
# Copyright (C) 2015 James Pannacciulli <jpnc@jpnc.info>
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# help function
_parssh.usage () {
printf ' %s\n'\
"parssh: Parallel SSH orchestration in a Bash session."\
""\
"SYNOPSIS"\
"parssh [-NUM] [-r|--rinput FILE] [-s|--servers FILE] [-b|--bare] [-c|--config]"\
" [COMMANDS] [< SERVERS]"\
""\
"DESCRIPTION"\
" -NUM (default: 4)"\
" Number of concurrent ssh connections to maintain. E.g. '-40'."\
""\
" -r FILE, --rinput FILE (default: unset/inactive)"\
" File to send as STDIN redirection on remote servers."\
" (Can be used as replacement for or in conjunction with COMMANDS)."\
""\
" -s FILE, --servers FILE (default: unset/inactive)"\
" File to use as list of servers to run COMMANDS on."\
" (Cannot be used in conjunction with a server list on STDIN)."\
""\
" -b, --bare (default: unset/inactive)"\
" Disable prepending of hostname to each output line returned by COMMANDS on SERVERS."\
""\
" -C, --savecmd (default: unset/inactive)"\
" Save the remote command line and local meta data as a header on the output."\
""\
" -c SSH_OPTIONS, --config SSH_OPTIONS (default: unset/inactive)"\
" Comma separated list of configuration parameters to be passed to SSH via '-o' flag."\
""\
" -o PREFIX, --out PREFIX (default: unset/inactive)"\
" Redirect STDOUT / STDERR to PREFIX.out / PREFIX.err, respectively."\
""\
" -t PREFIX, --tee PREFIX (default: unset/inactive)"\
" Copy STDOUT / STDERR to PREFIX.out / PREFIX.err, respectively."\
""\
" COMMANDS"\
" The list of commands to be executed remotely by SSH on each SERVER."\
""\
" < SERVERS"\
" Unless '-s' flag is used, STDIN will be used as list of remote servers."\
" (Deliniated by newlines)."\
""\
"NOTES"\
" Given the nature of entering passwords manually, this function will likely not be"\
" very useful without properly authorized SSH keys on all SERVERS."
return 1
}
# text processing functions
_parssh.host_prepend ()
while read -r; do
printf "${_parssh_prepend_host+$host: }%s\n" "$REPLY"
done
_parssh.out () {
local _parssh_out_stream="$1"
while read -r; do
[[ "${_parssh_out_stdout}" == "true" ]] && \
printf "%s\n" "$REPLY"
[[ "${_parssh_out_file}" == "true" ]] && \
printf "%s\n" "$REPLY" >> "${_parssh_out_prefix}.${_parssh_out_stream}"
done
}
_parssh.savecmd () {
CMDLINE=$(fc -ln -0)
CMDLINE="${CMDLINE#[[:space:]][[:space:]]}"
printf "### # ##\n"
printf "### %s: %s\n"\
date "$(date +%F@%R%z)"\
user "$USER($UID)"\
pwd "$PWD"\
cmdline "$CMDLINE"
printf "### BEGIN parssh remote commands ###\n"
printf "%s\n### END parssh remote commands ###\n### ## #\n"\
"$@"
}
# fd handlers
_parssh.serverlist_fd () {
[[ -z "$_parssh_servers" ]] && {
[[ -t 0 ]] && {
echo "No list of servers provided."
return 79
}
exec 9<&0
} || {
exec 9< <(printf "%s\n" "$_parssh_servers")
}
}
_parssh.serverlist_fd_close () {
exec 9>&-
}
# ssh workers
_parssh.ssh () {
ssh -n ${_parssh_ssh_config+-o} ${_parssh_ssh_config//,/ -o } $host -- "$@"
}
_parssh.ssh_rinput () {
ssh -T ${_parssh_ssh_config+-o} ${_parssh_ssh_config//,/ -o } $host -- "$@"\
< "$_parssh_rinput"
}
# main
parssh () {
# print usage info and exit if no arguments provided
(( $# )) || {
_parssh.usage
return $?
}
# preserve current bash options and ensure monitor (job control) is set
local _parssh_origopts=$-
set -m
# initialize local defaults
local _parssh_out_stdout=true
local _parssh_out_file=false
local _parssh_prepend_host=true
local _parssh_ssh=_parssh.ssh
# parse parssh command line arguments
while [[ "$1" == -* ]]; do
case ${1#-} in
-)
shift
break
;;
[0-9]*)
[[ "${1#-}" != *[^0-9]* ]] && {
local _parssh_concurrency=${1#-}
}
;;
b|-bare)
unset _parssh_prepend_host
;;
c|-config)
local _parssh_ssh_config="$2"
shift
;;
C|-savecmd)
local _parssh_savecmd="true"
;;
h|-help)
_parssh.usage
return $?
;;
o|-out)
touch "${2}."{out,err} || {
echo "'${2}.{out,err}': unable to write / modify file"
return 97
}
local _parssh_out_prefix="$2"
local _parssh_out_stdout=false
local _parssh_out_file=true
shift
;;
r|-rinput)
[[ -r "$2" ]] || {
echo "'$2': invalid file name or permissions issue"
return 98
}
local _parssh_rinput="$2"
local _parssh_ssh=_parssh.ssh_rinput
shift
;;
s|-servers)
[[ -r "$2" ]] || {
echo "'$2': invalid file name or permissions issue"
return 99
}
local _parssh_servers="$2"
shift
;;
t|-tee)
touch "${2}."{out,err} || {
echo "'${2}.{out,err}': unable to write / modify file"
return 96
}
local _parssh_out_prefix="$2"
local _parssh_out_stdout=true
local _parssh_out_file=true
shift
;;
esac
shift
done
# load list of servers on fd 9
_parssh.serverlist_fd
# run main command loop / capture outputs
{
[[ "$_parssh_savecmd" == "true" ]] && _parssh.savecmd
while read host; do
while (( $(jobs -pr | wc -l) >= ${_parssh_concurrency:-4} )); do
sleep 1
done
$_parssh_ssh "$@" 2> >(_parssh.host_prepend >&2) |\
_parssh.host_prepend &
done <&9 2> >(_parssh.out err >&2)
} | _parssh.out out
wait
# close serverlist fd
_parssh.serverlist_fd close
# restore bash options if modified
[[ "${_parssh_origopts//[^m]/}" == "m" ]] || set +m
}
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