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https://github.com/m8tin/cis.git
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First zfs scripts
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m8in
Executable
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#!/bin/bash
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_MODE=$(echo "${1:?"MODE missing [--all, --once, --loop]"}" | sed -E 's|[^a-zA-Z0-9_-]*||g')
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_COMPOSITION=$(echo "${2}" | sed -E 's|[^a-zA-Z0-9_-]*||g')
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_SSH_PORT=$(echo "${3:-22}" | sed -E 's/[^0-9]//g')
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# Folders always ends with an tailing '/'
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_SCRIPT="$(readlink -f "${0}" 2> /dev/null)"
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_CIS_ROOT="${_SCRIPT%/script/host/zfs/composition-sync/sync.sh}/" #Removes shortest matching pattern '/script/host/zfs/composition-sync/sync.sh' from the end
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_SEND_SCRIPT="${_CIS_ROOT:?"Missing CIS_ROOT"}script/host/zfs/composition-sync/sync-send.sh"
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_DOMAIN="$("${_CIS_ROOT:?"Missing CIS_ROOT"}core/printOwnDomain.sh")"
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_DEFINITIONS="${_CIS_ROOT:?"Missing CIS_ROOT"}definitions/${_DOMAIN:?"Missing DOMAIN"}/"
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_RECEIVERHOST=$(hostname -b)
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function stopObsoleteScreenSession() {
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local _RECEIVERHOST _SYNCHOSTS_FILE _SCREEN_SESSION _COMPOSITION _PID
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_RECEIVERHOST="${1:?"stopObsoleteScreenSession(): Missing first parameter RECEIVERHOST"}"
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_SYNCHOSTS_FILE="${2:?"stopObsoleteScreenSession(): Missing second parameter SYNCHOSTS_FILE"}"
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_SCREEN_SESSION="${3:?"stopObsoleteScreenSession(): Missing third parameter SCREEN_SESSION"}"
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_COMPOSITION=$(echo "$_SCREEN_SESSION" | grep -oE "[^.]+$")
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_PID=$(echo "$_SCREEN_SESSION" | grep -oE "^[0-9]+")
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readonly _RECEIVERHOST _SYNCHOSTS_FILE _SCREEN_SESSION _COMPOSITION _PID
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! grep -qiE "^${_RECEIVERHOST}$" "${_DEFINITIONS}compositions/${_COMPOSITION}/${_SYNCHOSTS_FILE}" \
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&& echo "Stopping screen session of composition-sync: ${_COMPOSITION}" \
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&& screen -XS "${_PID}" quit
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}
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function cleanSessions() {
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local _RECEIVERHOST _SYNCHOSTS_FILE
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_RECEIVERHOST="${1:?"cleanSessions(): Missing first parameter RECEIVERHOST"}"
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_SYNCHOSTS_FILE="${2:?"cleanSessions(): Missing second parameter SYNCHOSTS_FILE"}"
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readonly _RECEIVERHOST _SYNCHOSTS_FILE
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screen -ls | grep -oE "[0-9]+\.compositionsync\.[a-zA-Z0-9_-]+" | while read -r _SCREEN_SESSION; do
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stopObsoleteScreenSession "${_RECEIVERHOST}" "${_SYNCHOSTS_FILE}" "${_SCREEN_SESSION}"
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done
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}
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function startMissingScreenSession() {
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local _COMPOSITION _SSH_PORT
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_COMPOSITION="${1:?"startMissingScreenSession(): Missing first parameter COMPOSITION"}"
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_SSH_PORT="${2:-22}"
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readonly _COMPOSITION _SSH_PORT
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! screen -ls | grep -qoE "[0-9]+\.compositionsync\.${_COMPOSITION}" \
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&& echo "Starting screen session of composition-sync: ${_COMPOSITION}" \
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&& screen -dmS "compositionsync.${_COMPOSITION}" "${_SCRIPT}" --loop "${_COMPOSITION}" "${_SSH_PORT}"
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}
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function addSessions() {
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local _RECEIVERHOST _SYNCHOSTS_FILE
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_RECEIVERHOST="${1:?"addSessions(): Missing first parameter RECEIVERHOST"}"
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_SYNCHOSTS_FILE="${2:?"addSessions(): Missing second parameter SYNCHOSTS_FILE"}"
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readonly _RECEIVERHOST _SYNCHOSTS_FILE
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local _COMPOSITION
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grep -lrE "^${_RECEIVERHOST}" ${_DEFINITIONS}compositions/*/${_SYNCHOSTS_FILE} | while read -r _CURRENT_SYNCHOSTS_FILE; do
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_SSH_PORT=$(grep -E "^${_RECEIVERHOST} usePort [0-9]*.*$" "${_CURRENT_SYNCHOSTS_FILE}" | cut -d' ' -f3 | xargs)
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_COMPOSITION=$(basename $(dirname "${_CURRENT_SYNCHOSTS_FILE}"))
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startMissingScreenSession "${_COMPOSITION}" "${_SSH_PORT}"
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done
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}
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function destroySyncSnapshot() {
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local _ZFS _SNAPSHOT
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_ZFS="${1:?"destroySyncSnapshot(): Missing first parameter ZFS"}"
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_SNAPSHOT="${2}"
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readonly _ZFS _SNAPSHOT
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# Nothing to do
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[ -z "${_SNAPSHOT}" ] && return 0
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echo "${_SNAPSHOT}" | grep -qF "${_ZFS:?"destroySyncSnapshot(): Missing ZFS"}@SYNC" \
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&& zfs destroy "${_SNAPSHOT}" \
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&& return 0
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return 1
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}
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function protectZFS() {
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local _ZFS
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_ZFS="${1:?"protectZFS(): Missing first parameter ZFS"}"
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readonly _ZFS
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zfs set readonly=on "${_ZFS}"
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zfs set mountpoint=none "${_ZFS}"
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return 0
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}
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function removeForeignSyncSnapshots() {
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local _RECEIVERHOST _ZFS
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_RECEIVERHOST="${1:?"removeForeignSyncSnapshots(): Missing first parameter RECEIVERHOST"}"
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_ZFS="${2:?"removeForeignSyncSnapshots(): Missing second parameter ZFS"}"
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readonly _RECEIVERHOST _ZFS
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zfs list -t snapshot -H -o name "${_ZFS}" | grep -- "${_ZFS}@SYNC" | grep -v -i "@SYNC_${_RECEIVERHOST}_" | while read _SNAP; do
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echo -n "Removing foreign snapshot: ${_SNAP} ... " \
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&& destroySyncSnapshot "${_ZFS}" "${_SNAP}" \
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&& echo "done"
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done
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return 0
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}
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function removeOutdatedSyncSnapshots() {
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local _RECEIVERHOST _ZFS _NEWEST_SNAPSHOT
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_RECEIVERHOST="${1:?"removeOutdatedSyncSnapshots(): Missing first parameter RECEIVERHOST"}"
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_ZFS="${2:?"removeOutdatedSyncSnapshots(): Missing second parameter ZFS"}"
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_NEWEST_SNAPSHOT=$(zfs list -H -o name -S name -t snapshot "${_ZFS}" | grep -E "^${_ZFS}@SYNC_${_RECEIVERHOST}_" | head -n 1)
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readonly _RECEIVERHOST _ZFS _NEWEST_SNAPSHOT
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# Nothing to do, because if there is no newest snapshot then there cannot be anyone
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[ -z "${_NEWEST_SNAPSHOT}" ] && return 0
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# Remove all but the newest snapshot, which is the common snapshot in the next run
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zfs list -t snapshot -H -o name "${_ZFS}" | grep -- "${_ZFS}@SYNC_${_RECEIVERHOST}_" | grep -v -i "${_NEWEST_SNAPSHOT}" | while read _SNAP; do
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echo -n "Removing outdated snapshot: ${_SNAP} ... " \
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&& destroySyncSnapshot "${_ZFS}" "${_SNAP}" \
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&& echo "done"
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done
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return 0
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}
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function receive() {
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local _RECEIVERHOST _COMPOSITION
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_RECEIVERHOST="${1:?"receive(): Missing first parameter RECEIVERHOST"}"
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_COMPOSITION="${2:?"receive(): Missing second parameter COMPOSITION"}"
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readonly _RECEIVERHOST _COMPOSITION
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(
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flock -n 9 || exit 1
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_SOURCEHOST=$(cat ${_DEFINITIONS}compositions/${_COMPOSITION}/current-host)
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_ZFS="zpool1/persistent/${_COMPOSITION}-BACKUP"
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_SSH_COMMAND="ssh -p ${_SSH_PORT} -o ConnectTimeout=20 -o ServerAliveInterval=15 -C composition-sync@${_SOURCEHOST}"
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_COMMON_SNAPSHOT=""
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_RESUME_TOKEN=$(zfs get -H -o value receive_resume_token "${_ZFS}" 2> /dev/null)
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if [ -n "${_RESUME_TOKEN}" ] && [ "${_RESUME_TOKEN}" != "-" ]; then
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echo "Resume token present trying to resume at ${_RESUME_TOKEN}"
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_COMMON_SNAPSHOT="RESUME"
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else
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_RESUME_TOKEN=""
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_COMMON_SNAPSHOT=$(zfs list -H -o name -S creation -t snapshot "${_ZFS}" 2> /dev/null | head -n 1)
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! [ -z "${_COMMON_SNAPSHOT}" ] \
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&& echo "Rolling back to newest snapshot: ${_COMMON_SNAPSHOT}" \
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&& zfs rollback -r "${_COMMON_SNAPSHOT}"
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fi
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# Add "-s" for resumable streams in the next line at zfs receive. Not done yet because of: cannot receive resume stream: kernel modules must be upgraded to receive this stream.
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${_SSH_COMMAND} "sudo ${_SEND_SCRIPT:?"Missing SEND_SCRIPT"} \"${_RECEIVERHOST}\" \"${_COMPOSITION}\" \"${_COMMON_SNAPSHOT#${_ZFS}@}\" \"${_RESUME_TOKEN}\"" | zfs receive -v "${_ZFS}"
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[ $? -ne 0 ] \
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&& echo "Unable to receive stream unsing these settings:" \
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&& echo " - Sending host: ${_SOURCEHOST}:${_SSH_PORT}" \
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&& echo " - Receiving host: ${_RECEIVERHOST}" \
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&& echo " - Composition: ${_COMPOSITION}" \
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&& echo " - Offered snapshot: ${_COMMON_SNAPSHOT}" \
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&& echo " - Resume token: ${_RESUME_TOKEN}" \
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&& return 1
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protectZFS "${_ZFS}"
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removeForeignSyncSnapshots "${_RECEIVERHOST}" "${_ZFS}"
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removeOutdatedSyncSnapshots "${_RECEIVERHOST}" "${_ZFS}"
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) 9>>/tmp/synccomposition.${_COMPOSITION}.lock
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[ $? -eq 0 ] && return 0
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return 1
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}
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[ "${_MODE}" == "--all" ] \
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&& cleanSessions "${_RECEIVERHOST}" composition-sync-hosts \
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&& addSessions "${_RECEIVERHOST}" composition-sync-hosts \
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&& exit 0
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[ "${_MODE}" == "--once" ] \
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&& receive "${_RECEIVERHOST}" "${_COMPOSITION}" \
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&& exit 0
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[ "${_MODE}" == "--loop" ] && while true; do
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receive "${_RECEIVERHOST}" "${_COMPOSITION}" \
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&& echo "Sleep for 5s" \
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&& sleep 5 \
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&& echo \
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&& continue
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echo
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echo "Waiting 5min then ABORT!"
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sleep 300
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break
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done
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exit 1
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