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#!/bin/bash
# ltask: lightweight remote task execution
# Copyright (C) 2020 Jonas Gunz <himself@jonasgunz.de>
#
# 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 <https://www.gnu.org/licenses/>.
ARGC=$#
ARGV=($@)
DIRNAME=$(dirname $0)
[ -d $DIRNAME ] && cd $DIRNAME
unset DIRNAME
[ ! -f ./$(basename $0) ] && echo "Could not find working directory" && exit 1
BASEDIR=$(pwd)
export readonly TOOL_DIR=$BASEDIR/tools
export readonly INCLUDE_DIR=$BASEDIR/libs
TASK=
TARGET=
PARALLEL="no"
HOSTS=()
FILES=()
INCLUDES=()
#block run when sourcing task
export readonly HOSTMODE="yes"
function perror() {
echo -e $@ 1>&2
}
selector()
{
local regex="^-?[0-9]+\$"
local cnt=0
for selection in "$@"
do
echo "$cnt) $selection"
((cnt=$cnt + 1))
done
read -p "(default=0) >" inp
if [[ "$inp" =~ $regex ]] && [ $inp -ge 0 -a $inp -le $# ]
then
return $inp
fi
return 0
}
function print_help() {
cat << EOF
Usage:
$0 [OPTIONS] TASK TARGET
Options:
-H HOST Add HOST to target hosts. can be used
to target single hosts without defining
a custom target
-p Force parallel execution
-h print this help text
-d DIR specify a different folder containing "tasks", "targets", and "assets"
EOF
exit $1
}
#Parse args
for (( i=0; i < $ARGC;i++ )); do
ARGREGEX="^-.*"
if [[ ! ${ARGV[$i]} =~ $ARGREGEX ]]; then
[ -z $TASK ] && TASK=${ARGV[$i]} && continue
[ -z $TARGET ] && TARGET=${ARGV[$i]} && continue
print_help 1
fi
case ${ARGV[$i]} in
-H)
i=$((i+1))
HOSTS+=(${ARGV[$i]});;
-p)
PARALLEL="yes";;
-h)
print_help 0;;
-d)
i=$((i+1))
BASEDIR="${ARGV[$i]}";;
*)
echo Invalid Argument ${ARGV[$i]}
echo $0 -h for help
exit 1;;
esac
done
# Set after BASEDIR might have been changed
export readonly TASK_DIR=$BASEDIR/tasks
export readonly ASSET_DIR=$BASEDIR/assets
export readonly TARGET_DIR=$BASEDIR/targets
if [ -z $TASK ]; then
TASK_LIST=( $(ls $TASK_DIR) )
TARGET_LIST=( $(ls $TARGET_DIR) )
perror "\nSelect a Task"
>&2 selector ${TASK_LIST[@]}
TASK=${TASK_LIST[$?]}
perror "\nSelect a Target"
>&2 selector ${TARGET_LIST[@]}
TARGET=${TARGET_LIST[$?]}
fi
unset TASK_ISSET
[ -f $TARGET_DIR/$TARGET ] && source $TARGET_DIR/$TARGET
[ -f $TASK_DIR/$TASK ] && source $TASK_DIR/$TASK
if [ -z $TASK_ISSET ]; then
perror Task did not load correctly
exit 1
fi
HOSTS_UNIQUE=($(tr ' ' '\n' <<< "${HOSTS[@]}" | sort -u))
COUNTER=0
HOSTCOUNT=${#HOSTS_UNIQUE[@]}
[ $PARALLEL = "yes" ] && AND="&"
declare -A HOST_PID
for hoststring in "${HOSTS_UNIQUE[@]}"; do
rexecargs=""
IFS=$':' read hostname port <<< "$hoststring"
[ ! -z $port ] && rexecargs+="-p $port "
[ ! -z $SSH_IDENTITY_FILE ] && rexecargs+="-i $SSH_IDENTITY_FILE "
[ ${#FILES[@]} -gt 0 ] && for f in ${FILES[@]}; do rexecargs+="-f $f "; done
[ ! -z $SSH_USER ] && rexecargs+="$SSH_USER@"
rexecargs+="$hostname ${INCLUDES[@]} $TASK_DIR/$TASK"
set -o pipefail
eval "$TOOL_DIR/rexec.sh $rexecargs | (while read l; do echo [$hostname] \$l; done) $AND"
RET=$?
if [ $PARALLEL = "yes" ]; then
HOST_PID[$hostname]=$!
else
[ $RET -ne 0 ] && FAILED_HOSTS+=($hostname)
COUNTER=$(($COUNTER + 1))
PERCENT=$(($COUNTER * 100 / $HOSTCOUNT))
perror -n "\r[$COUNTER: $PERCENT%] "
fi
done
if [ $PARALLEL = "yes" ]; then
perror Waiting for asynchronous tasks to finisch...
for hostname in ${!HOST_PID[@]}; do
wait ${HOST_PID[$hostname]}
[ $? -ne 0 ] && FAILED_HOSTS+=($hostname)
done
perror Done!
fi
if [ ${#FAILED_HOSTS[@]} -gt 0 ]; then
perror
perror ${#FAILED_HOSTS[@]} targets failed:
perror ${FAILED_HOSTS[@]}
exit 1
fi
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