53 lines
1.1 KiB
Bash
53 lines
1.1 KiB
Bash
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#!/bin/sh
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set -eu
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fail() {
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echo $* >&2
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exit 1
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}
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requireCommands() {
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for cmd in $*; do
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if ! command -v $cmd &> /dev/null; then
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fail "Cannot find required command: $cmd"
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fi
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done
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}
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[ "$#" -ne 2 ] && fail "usage: $0 <image> <package>"
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image="$1"
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package="$2"
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if [ ! -r "$image" ]; then
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fail "$image does not exist or cannot be read!"
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fi
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if [ -e "$package" ]; then
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fail "$package already exists, aborting"
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fi
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requireCommands sfdisk awk fatcat zip
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workdir="$(mktemp -d)"
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trap 'rm -rf "$workdir"' EXIT
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basedir="$PWD"
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imagename="$(basename "$image")"
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imagedir="$(dirname "$image")"
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# extract filesystems from disk image
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pushd "$imagedir"
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eval "$(sfdisk -ql "$imagename" | awk "NR>=2 { printf \"dd if=${imagename} of=${workdir}/%s skip=%s count=%s\\n\", \$1, \$2, \$4 }")"
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popd
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# build package
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mkdir -p "${workdir}/package/esp"
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fatcat "${workdir}/${imagename}1" -x "${workdir}/package/esp"
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mv "${workdir}/${imagename}2" "${workdir}/package/boot.img"
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mv "${workdir}/${imagename}3" "${workdir}/package/root.img"
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pushd "${workdir}/package"
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zip -r "${basedir}/${package}" .
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popd
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