rsync-notify-multiple

#!/usr/bin/env bash

# NOTE: There is also rsync's batch mode, but for that we have to have two identical trees
# on each machine. This here supports syncing to multiple remote machines in any state.

args=()
machines=()
while [[ $# -gt 0 ]]; do
    case "$1" in
        --machine)
            machines+=("$2")
            shift 2
            ;;
        *)
            args+=("$1")
            shift 1
            ;;
    esac
done

# NOTE: filter lists are passed from stdin and this page below says that even stdout and err
# are important to keep clean, but till now we had no problems with those
# https://lsyncd.github.io/lsyncd/faq/postscript/
tmp=$(mktemp)
trap 'rm -f "$tmp"' EXIT INT ABRT TERM
cp /dev/stdin "$tmp"
msg="$(basename "${args[-2]}") ->"
for machine in "${machines[@]}"; do
    msg+=" $machine"
    rsync "${args[@]::${#args[@]}-1}" "$machine:${args[-1]}" < "$tmp" &
done

for job in $(jobs -p); do
    if ! wait "$job"; then
        notify-send -- "$machine failed"
        err=1
    fi
done
[ -n "$err" ] && exit 1

readarray -d $'\0' -t files < "$tmp"
IFS=$'\n'
notify-send -- "$msg" "${files[*]}"

exit 0