Add public-ready version

LICENSE

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+MIT License
+
+Copyright (c) 2019 Loic Nageleisen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

rsync-backup.sh

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+#!/bin/bash
+
+set -e
+set -u
+set -o pipefail
+
+# TODO: update from github
+# TODO: reexec with caffeinate
+# TODO: take arguments: config, verbose, progress
+# TODO: purge old backups
+# TODO: purge previous progress
+# TODO: lock, and unlock on trap exit
+# TODO: non-darwin compatibility
+
+if [[ -z "${HOME}" ]]; then
+    echo "error: \$HOME unset" 1>&2
+    exit 1
+fi
+
+excluded=()
+excluded+=('.DS_Store')
+
+included=()
+
+config="${HOME}/.config/rsync-backup/rsync-backup.conf"
+
+if [[ -f "${config}" ]]; then
+    # shellcheck disable=SC1090
+    source "${config}"
+fi
+
+name="${name:-$(hostname -s)}"
+
+if [[ -z "${name}" ]]; then
+    echo "error: \$name unset" 1>&2
+    exit 1
+fi
+
+if [[ -z "${tgt}" ]]; then
+    echo "error: \$tgt unset" 1>&2
+    exit 1
+fi
+
+src="${src:-${HOME}}"
+port="${port:-22}"
+ts="${ts:-$(date -u '+%Y-%m-%d-%H%M%S')}"
+
+ssh=()
+if [[ ${tgt} = *:* ]]; then
+    ssh-add -l > /dev/null || ssh-add -A
+    ssh+=(ssh -p "${port}" "${tgt%%:*}")
+fi
+
+# TODO: create only when no latest
+# TODO: remove after first backup
+"${ssh[@]}" mkdir -p "${tgt#*:}/1970-01-01-000000"
+
+"${ssh[@]}" mkdir -p "${tgt#*:}/${ts}.progress"
+
+function latest() {
+    "${ssh[@]}" ls -1 "${tgt#*:}/" | grep -v '\.progress$' | grep -v latest | tail -1
+}
+latest="${tgt#*:}/$(latest)"
+echo "latest: '${latest}'"
+
+args=()
+args+=(--verbose)
+args+=(--progress)
+args+=(--compress)
+args+=(--rsh "ssh -p ${port}")
+args+=(--archive)
+args+=(--delete)
+args+=(--delete-excluded)
+
+for inc in "${included[@]}"; do
+    args+=(--include "${inc}")
+done
+
+for exc in "${excluded[@]}"; do
+    args+=(--exclude "${exc}")
+done
+
+# TODO: add multiple --link-dest
+args+=(--link-dest "${latest}/")
+args+=("${src}/")
+args+=("${tgt}/${ts}.progress/")
+
+# TODO: create local snapshot, and delete on trap exit
+# tmutil localsnapshot # => Created local snapshot with date: 2021-05-18-184103
+# tmutil listlocalsnapshots / # => com.apple.TimeMachine.2021-05-18-184302.local
+# diskutil apfs listvolumesnapshots disk1s2 # => Name:        com.apple.TimeMachine.2021-05-18-184302.local
+# mkdir -p /tmp/rsync-backup.snapshot.2021-05-18-184302
+# mount_apfs -s com.apple.TimeMachine.2021-05-18-184302.local /Users /tmp/rsync-backup.snapshot.2021-05-18-184302
+# ls /tmp/rsync-backup.snapshot.2021-05-18-184302/Users/
+# diskutil unmount /tmp/rsync-backup.snapshot.2021-05-18-184302
+# tmutil deletelocalsnapshots 2021-05-18-184302
+# tmutil deletelocalsnapshots /
+
+rc="0"
+set -x
+rsync "${args[@]}" || rc="$?"
+set +x
+
+case $rc in
+    24|0) : ;;
+    *) exit "$rc" ;;
+esac
+
+"${ssh[@]}" mv -v "${tgt#*:}/${ts}.progress" "${tgt#*:}/${ts}"
+"${ssh[@]}" ln -svhf "${tgt#*:}/${ts}" "${tgt#*:}/latest"