1 | #!/bin/bash |
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2 | exit 1 |
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3 | |
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4 | DISK=/dev/mapper/36090a028407d6e2b2589a45cdb971489 |
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5 | |
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6 | # The name of the LVM archive to get data from |
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7 | ARCHIVE=/etc/lvm/archive/xenvg_00685.vg |
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8 | |
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9 | # Extract the first block of an lv to a file named part-$lv |
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10 | getfirstblock () { |
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11 | lvname="$1" |
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12 | offset=$(grep -A16 $'\t'$lvname $ARCHIVE | grep pv0 | cut -f 2 -d ,); |
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13 | if [ -z "$offset" ]; then echo "WARNING: LV not found"; |
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14 | else |
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15 | echo "Extracting $lvname from offset $offset" |
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16 | dd if=$DISK of=part-$lvname bs=1M skip=$(( $offset * 8192 + 384 )) bs=512 count=1; |
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17 | fi |
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18 | } |
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19 | |
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20 | lvinfo () { |
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21 | perl -ne 'print if ( /^(\s*)'"$1"' \{/ ... /^$1\}/ )' $ARCHIVE |
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22 | } |
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23 | segment2 () { |
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24 | perl -ne 'print if ( /^(\s*)segment2 \{/ ... /^$1\}/ )' |
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25 | } |
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26 | |
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27 | |
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28 | # Generate a dd command to copy the LV data to /dev/xenvg/$lv |
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29 | # Only works for single-segment LVs. |
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30 | ddlv () { |
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31 | lvname="$1" |
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32 | if ! lvinfo $lvname | grep -q 'segment_count = 1'; then |
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33 | echo "# WARNING: LV $lvname has more than one segment, skipping" >&2 |
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34 | return 1 |
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35 | fi |
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36 | offset=$(lvinfo $lvname | perl -lne 'print $1 if (/"pv0", ([0-9]+)/)') |
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37 | length=$(lvinfo $lvname | perl -lne 'print $1 if (/extent_count = ([0-9]+)/)') |
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38 | |
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39 | if [ -z "$offset" ]; then |
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40 | echo "# WARNING: LV $lvname not found"; |
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41 | else |
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42 | echo "# Extracting $lvname from offset $offset PEs with length $length PEs" |
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43 | echo dd if=$DISK of=/dev/xenvg/$lvname \ |
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44 | skip=$(( $offset * 64 + 3 )) bs=64K count=$(( $length * 64 )) |
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45 | fi |
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46 | } |
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47 | |
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48 | # Generate a dd command to copy the LV data for the second segment. |
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49 | ddlv2 () { |
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50 | lvname="$1" |
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51 | if ! lvinfo $lvname | grep -q 'segment_count = 2'; then |
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52 | echo "# WARNING: LV $lvname has other than two segments, skipping" >&2 |
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53 | return 1 |
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54 | fi |
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55 | offset=$(lvinfo $lvname | segment2 | perl -lne 'print $1 if (/"pv0", ([0-9]+)/)') |
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56 | length=$(lvinfo $lvname | segment2 | perl -lne 'print $1 if (/extent_count = ([0-9]+)/)') |
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57 | seek=$(lvinfo $lvname | segment2 | perl -lne 'print $1 if (/start_extent = ([0-9]+)/)') |
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58 | |
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59 | if [ -z "$offset" ]; then |
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60 | echo "# WARNING: LV $lvname not found"; |
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61 | else |
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62 | echo "# Extracting $lvname segment 2 from offset $offset PEs with length $length PEs" |
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63 | echo dd if=$DISK of=/dev/xenvg/$lvname bs=64K \ |
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64 | skip=$(($offset*64 + 3)) count=$(($length*64)) seek=$(($seek*64)) |
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65 | fi |
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66 | } |
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