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zfs-backup
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will no longer invoke zfs with full path; will use sudo on remote only if login user is not root

This commit is contained in:
Tamás Gérczei 2020-04-19 19:18:58 +02:00
parent 881f9ace72
commit b185381e65
1 changed files with 15 additions and 12 deletions
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27
zfs-backup.sh
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@ -11,12 +11,12 @@ A configuration (f)ile must be supplied. An e-(m)ail address for reporting is op
}
function check_dataset() {
${R_RMOD} /usr/sbin/zfs get -pHo value creation ${1} &>/dev/null
${R_RMOD} zfs get -pHo value creation ${1} &>/dev/null
return $?
}
function snapuse() {
${R_RMOD} /usr/sbin/zfs get -Hpo value usedbysnapshots ${1}
${R_RMOD} zfs get -Hpo value usedbysnapshots ${1}
}
function human() {
@ -36,7 +36,7 @@ function backup() {
}
# determine which local snapshots exist already
SNAPSHOTS=( $(/usr/sbin/zfs list -rt snapshot -d1 -Ho name -S creation ${DATASET} 2>/dev/null) )
SNAPSHOTS=( $(zfs list -rt snapshot -d1 -Ho name -S creation ${DATASET} 2>/dev/null) )
LASTSNAP=${SNAPSHOTS[0]}
L_USED_BEFORE=$(snapuse ${DATASET})
@ -60,7 +60,10 @@ function backup() {
else
# configure for remote access
R_RMOD="ssh ${USER}@${TARGET}"
RMOD="${R_RMOD} sudo"
if [ $USER != 'root' ]
then
RMOD="${R_RMOD} sudo"
fi
fi
fi
@ -70,7 +73,7 @@ function backup() {
continue 2
}
R_SNAPSHOTS=( $(${R_RMOD} /usr/sbin/zfs list -rt snapshot -d1 -Ho name -S creation ${SAVETO}/$( basename ${DATASET}) 2>/dev/null) )
R_SNAPSHOTS=( $(${R_RMOD} zfs list -rt snapshot -d1 -Ho name -S creation ${SAVETO}/$( basename ${DATASET}) 2>/dev/null) )
check_dataset ${SAVETO}/$( basename ${DATASET}) && R_USED_BEFORE=$(snapuse ${SAVETO}/$( basename ${DATASET}))
# determine current timestamp
@ -80,13 +83,13 @@ function backup() {
NEWSNAP="${DATASET}@${DATE}"
# take a snapshot
/usr/sbin/zfs snapshot -r ${NEWSNAP}
zfs snapshot -r ${NEWSNAP}
# check if source is encrypted
if [ $ENCRYPTION_FEATURE != "disabled" ]
then
# encryption feature available
ENCRYPTION=$(/usr/sbin/zfs get -Ho value encryption ${DATASET})
ENCRYPTION=$(zfs get -Ho value encryption ${DATASET})
if [[ ${ENCRYPTION} != "off" ]]
then
# encryption in use, send raw stream
@ -107,7 +110,7 @@ function backup() {
R_SNAPMODIFIER="I $(dirname ${DATASET})/$(basename ${R_SNAPSHOTS[*]:(-1)})"
fi
# send any previous snapshots
/usr/sbin/zfs send -R${RAW_MOD}${R_SNAPMODIFIER} ${LASTSNAP} | ${RMOD} /usr/sbin/zfs recv -Feu${RESUME_MOD}v ${SAVETO} 2>&1 >> ${LOGFILE}
zfs send -Rv${RAW_MOD}${R_SNAPMODIFIER} ${LASTSNAP} | ${RMOD:-$R_RMOD} zfs recv -Feu${RESUME_MOD}v ${SAVETO} 2>&1 >> ${LOGFILE}
}
else
# ensure this does not remain in effect
@ -115,7 +118,7 @@ function backup() {
fi
# send backup
/usr/sbin/zfs send -R${RAW_MOD}${SNAPMODIFIER} ${NEWSNAP} | ${RMOD} /usr/sbin/zfs recv -Feu${RESUME_MOD}v ${SAVETO} 2>&1 >> ${LOGFILE}
zfs send -Rv${RAW_MOD}${SNAPMODIFIER} ${NEWSNAP} | ${RMOD:-$R_RMOD} zfs recv -Feu${RESUME_MOD}v ${SAVETO} 2>&1 >> ${LOGFILE}
# if replication is unsuccessful, omit the aging check so as to prevent data loss
if [ $? -eq 0 ]
@ -123,12 +126,12 @@ function backup() {
THRESHOLD=$(( $KEEP * 24 * 3600 ))
for SNAPSHOT in ${SNAPSHOTS[*]}
do
TIMESTAMP=$(/usr/sbin/zfs get -pHo value creation "${SNAPSHOT}")
TIMESTAMP=$(zfs get -pHo value creation "${SNAPSHOT}")
AGE=$(( $NOW - $TIMESTAMP ))
if [ $AGE -ge $THRESHOLD ]
then
/usr/sbin/zfs destroy -r ${SNAPSHOT} 2>&1 >> ${LOGFILE}
${RMOD} /usr/sbin/zfs destroy -r ${SAVETO}/$(basename ${SNAPSHOT}) 2>&1 >> ${LOGFILE}
zfs destroy -r ${SNAPSHOT} 2>&1 >> ${LOGFILE}
${RMOD:-$R_RMOD} zfs destroy -r ${SAVETO}/$(basename ${SNAPSHOT}) 2>&1 >> ${LOGFILE}
fi
done
else