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Rollback feature for sync

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m8in
2026-04-25 17:16:12 +02:00
parent 61593da47c
commit 1a9acbb9e5
2 changed files with 80 additions and 65 deletions
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script/host/zfs/composition-sync/sync-send.sh
+42 -48
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@@ -1,4 +1,7 @@
#!/bin/bash
source /cis/core/base.module.sh
function printNewestOrdinarySnapshot() {
local _ZFS _RECEIVERHOST
@@ -84,21 +87,39 @@ function sendResume() {
_RESUME_TOKEN="${1:?"sendResume(): Missing first parameter RESUME_TOKEN"}"
readonly _RESUME_TOKEN
zfs send -t "${RESUME_TOKEN}" \
zfs send -t "${_RESUME_TOKEN:?"Missing RESUME_TOKEN"}" \
&& return 0
return 1
}
function isValid() {
# printf '%s'
# - always treats the contents of ${1} as pure plain text.
# grep -qE: checks RegExp, but quiet
printf '%s' "${1}" | grep -qE "${2:?"isValid(): Missing REGEXP"}"
}
function send() {
local _COMPOSITION _RECEIVERHOST _RECEIVERS_SNAPSHOT _NOW _ZFS _NEW_SNAPSHOT
_COMPOSITION="${1:?"send(): Missing first parameter COMPOSITION"}"
_RECEIVERHOST="${2:?"send(): Missing second parameter RECEIVERHOST"}"
_RECEIVERS_SNAPSHOT="${3}"
_NOW=$(date -u "+%Y-%m-%d_%H:%M:%SZ")
_ZFS="zpool1/persistent/${_COMPOSITION:?"Missing COMPOSITION"}"
_NEW_SNAPSHOT="${_ZFS:?"Missing ZFS"}@SYNC_${_RECEIVERHOST:?"Missing RECEIVERHOST"}_${_NOW:?"Missing NOW"}"
readonly _COMPOSITION _RECEIVERHOST _RECEIVERS_SNAPSHOT _NOW _ZFS _NEW_SNAPSHOT
function isValidOptional() {
[ -z "${1}" ] || isValid "${1}" "${2}"
# This common snapshot is the starting-point, if available.
! _COMMON_SNAPSHOT=$(printFoundCommonSnapshot "${_ZFS}" "${_RECEIVERHOST}" "${_RECEIVERS_SNAPSHOT}") \
&& echo "Failure in sync-send.sh: abort" >&2 \
&& return 1
[ "${_COMMON_SNAPSHOT}" == "" ] \
&& zfs snapshot "${_NEW_SNAPSHOT}" \
&& zfs send -c -R "${_NEW_SNAPSHOT}" \
&& return 0
[ "${_COMMON_SNAPSHOT}" != "" ] \
&& removeReceiverhostsSyncSnapshotsExeptTheCommonOne "${_ZFS}" "${_RECEIVERHOST}" "${_COMMON_SNAPSHOT}" \
&& zfs snapshot "${_NEW_SNAPSHOT}" \
&& zfs send -c -R -I "${_COMMON_SNAPSHOT}" "${_NEW_SNAPSHOT}" \
&& return 0
return 1
}
@@ -107,48 +128,21 @@ function isValidOptional() {
# Parameter 2: Only alphanumeric characters allowed and [.-] if not leading (due to: -oProxyCommand=...).
# Parameter 3: Only alphanumeric characters allowed and [._:-] if not leading (due to: -oProxyCommand=...), but can be empty.
# Parameter 4: Only alphanumeric characters allowed and [._:-] if not leading (due to: -oProxyCommand=...), but can be empty.
if isValid "${1:?"RECEIVERHOST missing"}" '^[a-zA-Z0-9][a-zA-Z0-9._-]*$' \
&& isValid "${2:?"COMPOSITION missing"}" '^[a-zA-Z0-9][a-zA-Z0-9.-]*$' \
&& isValidOptional "${3}" '^[a-zA-Z0-9][a-zA-Z0-9._:-]*$' \
&& isValidOptional "${4}" '^[a-zA-Z0-9][a-zA-Z0-9._:-]*$'
then
_RECEIVERHOST="${1}"
_COMPOSITION="${2}"
_RECEIVERS_SNAPSHOT="${3}"
_RESUME_TOKEN="${4}"
base.set RECEIVERHOST "${1}" '^[a-zA-Z0-9][a-zA-Z0-9._-]*$' || exit 1
base.set COMPOSITION "${2}" '^[a-zA-Z0-9][a-zA-Z0-9.-]*$' || exit 1
base.set RECEIVERS_SNAPSHOT "${3}" '(^[a-zA-Z0-9][a-zA-Z0-9._:-]*$)?' || exit 1
base.set RESUME_TOKEN "${4}" '(^[a-zA-Z0-9][a-zA-Z0-9._:-]*$)?' || exit 1
_NOW=$(date -u "+%Y-%m-%d_%H:%M:%S")
_ZFS="zpool1/persistent/${_COMPOSITION:?"COMPOSITION missing"}"
_NEW_SNAPSHOT="${_ZFS:?"ZFS missing"}@SYNC_${_RECEIVERHOST:?"RECEIVERHOST missing"}_${_NOW:?"NOW missing"}"
# Resume mode
if [ "${RECEIVERS_SNAPSHOT}" == "RESUME" ]; then
sendResume "${RESUME_TOKEN}"
# Resume mode
if [ "${_RECEIVERS_SNAPSHOT}" == "RESUME" ]; then
sendResume "${_RESUME_TOKEN}"
# Exit preserving the code
exit $?
fi
# This common snapshot is the starting-point, if available.
! _COMMON_SNAPSHOT=$(printFoundCommonSnapshot "${_ZFS}" "${_RECEIVERHOST}" "${_RECEIVERS_SNAPSHOT}") \
&& echo "Failure in sync-send.sh: abort" >&2 \
&& exit 1
[ "${_COMMON_SNAPSHOT}" == "" ] \
&& zfs snapshot "${_NEW_SNAPSHOT}" \
&& zfs send -c -R "${_NEW_SNAPSHOT}" \
&& exit 0
[ "${_COMMON_SNAPSHOT}" != "" ] \
&& removeReceiverhostsSyncSnapshotsExeptTheCommonOne "${_ZFS}" "${_RECEIVERHOST}" "${_COMMON_SNAPSHOT}" \
&& zfs snapshot "${_NEW_SNAPSHOT}" \
&& zfs send -c -R -I "${_COMMON_SNAPSHOT}" "${_NEW_SNAPSHOT}" \
&& exit 0
else
echo "Failure in sync-send.sh: At least one parameter is invalid." >&2
exit 1
# Exit preserving the code
exit $?
fi
send "${COMPOSITION}" "${RECEIVERHOST}" "${RECEIVERS_SNAPSHOT}" \
&& exit 0
echo "Failure in sync-send.sh: Something unexpected happend." >&2
exit 1