Clone a ZFS vdev
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#!/bin/bash | |
set -e | |
dd_args=( | |
"-d" | |
"-b" "1M" | |
"-B" "4k" | |
"-w" | |
"-A" | |
) | |
warn() { | |
echo "$@" >&2 | |
} | |
die() { | |
warn "$@" | |
exit 1 | |
} | |
usage() { | |
warn "$( basename "$0" ) device [device [...]]" | |
} | |
get_first() { | |
key="$1" | |
text="$2" | |
value=$( echo "$text" | awk "(\$1 == \"$key:\") { print \$2; exit 0; }" ) | |
echo "${value//\'/}" | |
} | |
get_pool() { | |
get_first "name" "$@" | |
} | |
get_guid() { | |
get_first "guid" "$@" | |
} | |
get_timestamp() { | |
text="$1" | |
timestamps=( $( echo "$text" | awk '($1 == "timestamp") { print $3 }' | sort -n ) ) | |
echo "${timestamps[-1]}" | |
} | |
get_output_filename() { | |
base="$1" | |
n=1 | |
while [ -f "${base}-${n}.img" ] ; do | |
warn "${base}-${n}.img exists." | |
(( n++ )) | |
done | |
echo "${base}-${n}.img" | |
} | |
if [ "$#" -lt 1 ] ; then | |
usage | |
exit 1 | |
fi | |
cd /volumes/recovery/disks | |
for device in "$@" ; do | |
if [ ! -e "${device}1" ] ; then | |
die "Can't find first partition for device $device" | |
fi | |
zdb=$( zdb -l -u "${device}1" ) | |
pool=$( get_pool "$zdb" ) | |
guid=$( get_guid "$zdb" ) | |
timestamp=$( get_timestamp "$zdb" ) | |
echo "Recovering $guid from pool $pool last updated $( date --date="@$timestamp" )..." | |
mkdir -pv "${pool}/${guid}" | |
filename=$( get_output_filename "${pool}/${guid}/${timestamp}" ) | |
logfile="${filename%.img}.log" | |
badfile="${filename%.img}.bad" | |
echo "Cloning $device to $filename (logging to $logfile)..." | |
dd_rescue "${dd_args[@]}" -l "$logfile" -o "$badfile" "$device" "$filename" | |
done |
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