A POSIX sh implementation of Salt's eventlisten.py script. Uses salt-api's event HTTP stream.

eventlisten.sh

#!/bin/sh

URL="http://localhost:8000"
COOKIES="cookies.txt"

fnmatch () { case "$2" in $1) return 0 ;; *) return 1 ;; esac ; }

listen() {
    # Watch Salt's events HTTP stream.

    events='event_stream'
    mkfifo $events

    curl -b "${COOKIES}" -N -sS "$URL/events" >$events &
    curl_pid=$!

    trap '
        excode=$?; trap - EXIT;
        exec 5>&-
        kill '"${curl_pid}"'
        rm '"${events}"'
        rm '"${COOKIES}"'
        exit
        echo $excode
    ' INT TERM EXIT

    tag=""
    data=""
    while read -r line; do
        if fnmatch 'tag: *' "$line"; then
            tag="${line#tag: *}"
        elif fnmatch 'data: *' "$line"; then
            data="${line#data: *}"

            # Only listen for job return events.
            if fnmatch 'salt/job/*/ret/*' "$tag"; then
                printf '%s\n%s\n\n' "$tag" "$data"
            fi
        fi

    done < $events

    wait
}

login() {
    curl -c "${COOKIES}" -sSi "${URL}/login" \
        -d username='saltdev' -d password='saltdev' -d eauth='auto' \
        | head -1 | grep -q '200 OK'

    [ $? -eq 0 ] || exit $?
}

login
listen