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m8in
123 lines
4.3 KiB
Bash
Executable File
123 lines
4.3 KiB
Bash
Executable File
#!/bin/bash
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function printFoundCommonSnapshot() {
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local _ZFS _COMMON_SNAPSHOT_CANDIDATE
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_ZFS="${1:?"printFoundCommonSnapshot(): Missing first parameter ZFS"}"
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_COMMON_SNAPSHOT_CANDIDATE="${2:?"printFoundCommonSnapshot(): Missing second parameter COMMON_SNAPSHOT_CANDIDATE"}"
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readonly _ZFS _COMMON_SNAPSHOT_CANDIDATE
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local _FOUND_COMMON_SNAPSHOT
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_FOUND_COMMON_SNAPSHOT=""
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while read -r _ROW
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do
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if [ "${_ROW}" == "${_ZFS}@${_COMMON_SNAPSHOT_CANDIDATE}" ]; then
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_FOUND_COMMON_SNAPSHOT="${_ROW}"
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break
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fi
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done < <(zfs list -H -o name -S creation -t snapshot "${_ZFS}")
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[ $? -eq 0 ] \
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&& echo "${_FOUND_COMMON_SNAPSHOT}" \
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&& return 0
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return 1
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}
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function removeAllSyncSnapshotsExeptTheCommonOne() {
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local _ZFS _RECEIVERHOST _COMMON_SNAPSHOT
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_ZFS="${1:?"removeAllSyncSnapshotsExeptTheCommonOne(): Missing first parameter ZFS"}"
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_RECEIVERHOST="${2:?"removeAllSyncSnapshotsExeptTheCommonOne(): Missing second parameter RECEIVERHOST"}"
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_COMMON_SNAPSHOT="${3:?"removeAllSyncSnapshotsExeptTheCommonOne(): Missing third parameter COMMON_SNAPSHOT"}"
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readonly _ZFS _RECEIVERHOST _COMMON_SNAPSHOT
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while read -r _ROW
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do
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# Skip the common snapshot to keep it.
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# If the common snapshot is not a sync-snapshot all sync-snapshots will be removed.
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if [ "${_ROW}" == "${_COMMON_SNAPSHOT}" ]; then
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continue
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fi
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# Destroy all remaining sync-snapshots of the receiving host
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zfs destroy "${_ROW}"
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done < <(zfs list -H -o name -S creation -t snapshot "${_ZFS}" | grep -E "^${_ZFS}@SYNC_${_RECEIVERHOST}_")
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}
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function sendResume() {
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local _RESUME_TOKEN
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_RESUME_TOKEN="${1:?"sendResume(): Missing first parameter RESUME_TOKEN"}"
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readonly _RESUME_TOKEN
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zfs send -t "${RESUME_TOKEN}" \
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&& return 0
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return 1
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}
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function isValid() {
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# printf '%s'
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# - always treats the contents of ${1} as pure plain text.
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# grep -qE: checks RegExp, but quiet
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printf '%s' "${1}" | grep -qE "${2:?"isValid(): Missing REGEXP"}"
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}
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function isValidOptional() {
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[ -z "${1}" ] || isValid "${1}" "${2}"
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}
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# Parameter 1: Only alphanumeric characters allowed and [._-] if not leading (due to: -oProxyCommand=...).
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# Parameter 2: Only alphanumeric characters allowed and [.-] if not leading (due to: -oProxyCommand=...).
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# Parameter 3: Only alphanumeric characters allowed and [._:-] if not leading (due to: -oProxyCommand=...), but can be empty.
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# Parameter 4: Only alphanumeric characters allowed and [._:-] if not leading (due to: -oProxyCommand=...), but can be empty.
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if isValid "${1:?"RECEIVERHOST missing"}" '^[a-zA-Z0-9][a-zA-Z0-9._-]*$' \
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&& isValid "${2:?"COMPOSITION missing"}" '^[a-zA-Z0-9][a-zA-Z0-9.-]*$' \
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&& isValidOptional "${3}" '^[a-zA-Z0-9][a-zA-Z0-9._:-]*$' \
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&& isValidOptional "${4}" '^[a-zA-Z0-9][a-zA-Z0-9._:-]*$'
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then
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_RECEIVERHOST="${1}"
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_COMPOSITION="${2}"
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_RECEIVERS_SNAPSHOT="${3}"
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_RESUME_TOKEN="${4}"
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_ZFS="zpool1/persistent/${_COMPOSITION:?"COMPOSITION missing"}"
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# Resume mode
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if [ "${_RECEIVERS_SNAPSHOT}" == "RESUME" ]; then
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sendResume "${_RESUME_TOKEN}"
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exit $?
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fi
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# This common snapshot is the starting-point, if available.
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_COMMON_SNAPSHOT="$(printFoundCommonSnapshot ${_ZFS} ${_RECEIVERS_SNAPSHOT})"
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[ "${_COMMON_SNAPSHOT}" == "" ] \
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&& [ "${_RECEIVERS_SNAPSHOT}" != "" ] \
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&& echo "Requested snapshot '${_RECEIVERS_SNAPSHOT}' not available" \
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&& exit 1
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[ "${_COMMON_SNAPSHOT}" != "" ] \
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&& removeAllSyncSnapshotsExeptTheCommonOne "${_ZFS}" "${_RECEIVERHOST}" "${_COMMON_SNAPSHOT}"
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# Now create the first or a further sync-snapshot as end-point.
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_NEW_SNAPSHOT="${_ZFS}@SYNC_${_RECEIVERHOST:?"RECEIVERHOST missing"}_$(date -u "+%Y-%m-%d_%H:%M:%S")"
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[ "${_COMMON_SNAPSHOT}" == "" ] \
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&& zfs snapshot "${_NEW_SNAPSHOT}" \
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&& zfs send -c -R "${_NEW_SNAPSHOT}" \
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&& exit 0
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[ "${_COMMON_SNAPSHOT}" != "" ] \
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&& removeAllSyncSnapshotsExeptTheCommonOne "${_ZFS}" "${_RECEIVERHOST}" "${_COMMON_SNAPSHOT}" \
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&& zfs snapshot "${_NEW_SNAPSHOT}" \
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&& zfs send -c -R -I "${_COMMON_SNAPSHOT}" "${_NEW_SNAPSHOT}" \
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&& exit 0
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else
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echo "Failure: At least one parameter is invalid" >&2
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exit 1
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fi
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exit 1
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