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https://github.com/m8tin/cis.git
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m8in
231 lines
10 KiB
Bash
Executable File
231 lines
10 KiB
Bash
Executable File
#!/bin/bash
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source /cis/core/base.module.sh
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function stopObsoleteScreenSession() {
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local _RECEIVERHOST _SYNCHOSTS_FILE _SCREEN_SESSION _DEFINITIONS _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="${3:?"stopObsoleteScreenSession(): Missing third parameter SCREEN_SESSION"}"
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_DEFINITIONS="${CIS[DOMAINDEFINITIONS]:?"Missing CIS_DOMAINDEFINITIONS"}"
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_COMPOSITION=$(echo "$_SCREEN_SESSION" | grep -oE "[^:]+$")
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_PID=$(echo "$_SCREEN_SESSION" | grep -oE "^[0-9]+")
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readonly _RECEIVERHOST _SYNCHOSTS_FILE _SCREEN_SESSION _DEFINITIONS _COMPOSITION _PID
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! grep -qiE "^${_RECEIVERHOST}$" "${_DEFINITIONS}compositions/${_COMPOSITION}/${_SYNCHOSTS_FILE}" \
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&& echo "Stopping sync screen session of composition: ${_COMPOSITION}" \
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&& screen -XS "${_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]+\.composition-sync\:[a-zA-Z0-9_-]+" | while read -r _SCREEN_SESSION; do
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stopObsoleteScreenSession "${_RECEIVERHOST}" "${_SYNCHOSTS_FILE}" "${_SCREEN_SESSION}"
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done
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}
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function startMissingScreenSession() {
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local _COMPOSITION _SSH_PORT _SCRIPT
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_COMPOSITION="${1:?"startMissingScreenSession(): Missing first parameter COMPOSITION"}"
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_SSH_PORT="${2:-22}"
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_SCRIPT="${CIS[FULLSCRIPTNAME]:?"startMissingScreenSession(): Missing CIS_FULLSCRIPTNAME"}"
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readonly _COMPOSITION _SSH_PORT _SCRIPT
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! screen -ls | grep -qoE "[0-9]+\.compositionsync\.${_COMPOSITION}" \
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&& echo "Starting screen sync session of composition: ${_COMPOSITION}" \
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&& screen -dmS "composition-sync:${_COMPOSITION}" "${_SCRIPT}" --loop "${_COMPOSITION}" "${_SSH_PORT}"
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}
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function addSessions() {
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local _RECEIVERHOST _SYNCHOSTS_FILE _DEFINITIONS
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_RECEIVERHOST="${1:?"addSessions(): Missing first parameter RECEIVERHOST"}"
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_SYNCHOSTS_FILE="${2:?"addSessions(): Missing second parameter SYNCHOSTS_FILE"}"
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_DEFINITIONS="${CIS[DOMAINDEFINITIONS]:?"Missing CIS_DOMAINDEFINITIONS"}"
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readonly _RECEIVERHOST _SYNCHOSTS_FILE _DEFINITIONS
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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="${_CURRENT_SYNCHOSTS_FILE%/*}"
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_COMPOSITION="${_COMPOSITION##*/}"
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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}" "${_SNAP}" \
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&& echo "done"
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done
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return 0
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}
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function receive() {
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local _RECEIVERHOST _COMPOSITION _SOURCEHOST _SSH_PORT _SSH_COMMAND _SEND_SCRIPT _ZFS_BRANCH _ZFS
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_RECEIVERHOST="${1:?"receive(): Missing first parameter RECEIVERHOST"}"
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_COMPOSITION="${2:?"receive(): Missing second parameter COMPOSITION"}"
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_SOURCEHOST=$(head -n 1 "${CIS[DOMAINDEFINITIONS]:?"Missing CIS_DOMAINDEFINITIONS"}compositions/${_COMPOSITION}/current-host" 2> /dev/null)
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base.set _SOURCEHOST "${_SOURCEHOST}" '^[a-zA-Z0-9][a-zA-Z0-9.-]*$'
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_SSH_PORT=$(head -n 1 "${CIS[DOMAINDEFINITIONS]:?"Missing CIS_DOMAINDEFINITIONS"}compositions/${_COMPOSITION}/ssh-port" 2> /dev/null)
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base.set _SSH_PORT "${_SSH_PORT:-22}" '^[1-9][0-9]{1,4}$'
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_SSH_COMMAND="ssh -p ${_SSH_PORT} -o ConnectTimeout=20 -o ServerAliveInterval=15 -C composition-sync@${_SOURCEHOST}"
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_SEND_SCRIPT="${CIS[SCRIPTSROOT]:?"Missing CIS_SCRIPTSROOT"}host/zfs/composition-sync/sync-send.sh"
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_ZFS_BRANCH=$(head -n 1 "${CIS[DOMAINDEFINITIONS]:?"Missing CIS_DOMAINDEFINITIONS"}compositions/${_COMPOSITION}/zfs-branch" 2> /dev/null)
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base.set _ZFS_BRANCH "${_ZFS_BRANCH:-zpool1/persistent}" '^[a-zA-Z][a-zA-Z0-9/_-]*[a-zA-Z0-9]$'
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_ZFS="${_ZFS_BRANCH%/}/${_COMPOSITION}-BACKUP"
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readonly _RECEIVERHOST _COMPOSITION _SSH_COMMAND _SEND_SCRIPT _ZFS_BRANCH _ZFS
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(
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flock -n 9 || exit 1
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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}\" \"${_ZFS_BRANCH}\" \"${_COMPOSITION}\" \"${_COMMON_SNAPSHOT#${_ZFS}@}\" \"${_RESUME_TOKEN}\"" | zfs receive -v "${_ZFS}"
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if [ $? -ne 0 ]; then
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echo "Unable to receive stream using 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: ${_ZFS}@${_COMMON_SNAPSHOT#${_ZFS}@}"
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echo " - Resume token: ${_RESUME_TOKEN}"
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echo "Current state of snapshots:"
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zfs list -t snapshot "${_ZFS}" 2> /dev/null | tail
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tryRollbackToRepair "${_COMPOSITION}" "${_RECEIVERHOST}" "${_ZFS}" && return 0
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return 1
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fi
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protectZFS "${_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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[ $? -eq 0 ] && return 0
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return 1
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}
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function tryRollbackToRepair() {
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local _COMPOSITION _RECEIVERHOST _ZFS _ROLLBACK_DAY _ROLLBACK_SNAPSHOT
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_COMPOSITION="${1:?"tryRollbackToRepair(): Missing first parameter COMPOSITION"}"
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_RECEIVERHOST="${2:?"tryRollbackToRepair(): Missing second parameter RECEIVERHOST"}"
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_ZFS="${3:?"tryRollbackToRepair(): Missing third parameter ZFS"}"
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_ROLLBACK_DAY=$(head -n 1 "${CIS[DOMAINDEFINITIONS]:?"Missing CIS_DOMAINDEFINITIONS"}compositions/${_COMPOSITION:?"Missing COMPOSITION"}/rollback")
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base.set _ROLLBACK_DAY "${_ROLLBACK_DAY:-'2020-01-01'}" '^[0-9]{4}-[0-9]{2}-[0-9]{2}$'
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_ROLLBACK_SNAPSHOT=$(zfs list -H -o name -S creation -t snapshot "${_ZFS}" | head -n 1 | grep -F -- "@SYNC_${_RECEIVERHOST}_${_ROLLBACK_DAY}_")
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readonly _COMPOSITION _RECEIVERHOST _ZFS _ROLLBACK_SNAPSHOT
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# Nothing to do
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[ -z "${_ROLLBACK_SNAPSHOT}" ] && return 0
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# Remove at most the two newest sync snapshots, if the day matches with the rollback file
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echo "Try to fix by removing: '${_ROLLBACK_SNAPSHOT}'" \
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&& zfs destroy "${_ROLLBACK_SNAPSHOT:?"tryRollbackToRepair(): Missing _ROLLBACK_SNAPSHOT"}" \
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&& return 0
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return 1
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}
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# Parameter 1: only one of these values are allowed (--all, --once, --loop)
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# Parameter 2: is optional '()?' and only a subset of alphanumeric characters are allowed and [_-] if not leading (due to: -oProxyCommand=...).
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# Value 3 : only a subset of alphanumeric characters are allowed and [.-] if not leading (due to: -oProxyCommand=...).
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base.set MODE "${1}" '^(--all|--once|--loop)$'
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base.set COMPOSITION "${2}" '^([a-zA-Z0-9][a-zA-Z0-9_-]*)?$'
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base.set RECEIVERHOST "$(hostname -b)" '^[a-zA-Z0-9][a-zA-Z0-9.-]*$'
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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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