26 lines
869 B
Bash
26 lines
869 B
Bash
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#!/usr/bin/env bash
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set -eo pipefail
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image="$1"; [ -z "$1" ] && { echo "No image file specified!" >&2; exit 1; }
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mfile="$2"; [ -z "$2" ] && { echo "No mapfile specified!" >&2; exit 1; }
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[ -z $3 ] && [ -t 1 ] && { echo "The output of this script is unsafe for raw display." >&2
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exit 1; } \
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|| ofile=${3:-/dev/stdout}
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BLOCKSIZE=`sed -nE 's/^#BLOCKSIZE=([0-9]+)$/\1/p' "$mfile"`
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[ -z "$BLOCKSIZE" ] && { echo "Mapfile does not specify blocksize!" >&2; exit 1; }
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shopt -s expand_aliases
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alias dd="dd bs=$BLOCKSIZE status=none"
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{
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i=0
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while read -r -d$'\n' _ block lengt _; do
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#Leaves the remainder block for convenience
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dd if="$image" skip=$i count=$((block-i))
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dd if=/dev/zero count=$((lengt-1))
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i=$((block+lengt-1))
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done < <(grep -v ^\# "$mfile" | sed -En '/[a-f0-9]{64}/!p' | sort -unk2)
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dd if="$image" skip=$i
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} > "$ofile"
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