79 lines
1.9 KiB
Plaintext
79 lines
1.9 KiB
Plaintext
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#!/bin/bash
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# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
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# ex: ts=8 sw=4 sts=4 et filetype=sh
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# This script generates a service that manages a dm-verity device for the chosen ROOT partition
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set -e
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cmdline=( $(</proc/cmdline) )
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# Usage: cmdline_arg name default_value
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cmdline_arg() {
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local name="$1" value="$2"
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for arg in "${cmdline[@]}"; do
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if [[ "${arg%%=*}" == "${name}" ]]; then
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value="${arg#*=}"
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fi
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done
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echo "${value}"
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}
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UNIT_DIR="${1:-/tmp}"
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root=$(cmdline_arg verity.root)
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roothash=$(cmdline_arg verity.roothash)
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hashoffset=$(cmdline_arg verity.hashoffset)
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case "${root}" in
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LABEL=*)
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root="$(echo $root | sed 's,/,\\x2f,g')"
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root="/dev/disk/by-label/${root#LABEL=}"
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;;
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UUID=*)
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root="${root#UUID=}"
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root="/dev/disk/by-uuid/${root,,}"
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;;
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PARTUUID=*)
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root="${root#PARTUUID=}"
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root="/dev/disk/by-partuuid/${root,,}"
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;;
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PARTLABEL=*)
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root="/dev/disk/by-partlabel/${root#PARTLABEL=}"
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;;
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esac
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# Only proceed if the source is a path.
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if [[ "${root}" != /* ]]; then
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exit 0
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fi
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# Only generate the service if we have sufficient parameters.
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if [[ -n "${root}" && -n "${roothash}" ]]; then
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device=$(systemd-escape --suffix=device --path "${root}")
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cat >"${UNIT_DIR}/verity-setup.service" <<-EOF
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# Automatically generated by verity-generator
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[Unit]
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Description=Verity Setup for /dev/mapper/root
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SourcePath=/proc/cmdline
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DefaultDependencies=no
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IgnoreOnIsolate=true
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BindsTo=dev-mapper-root.device
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BindsTo=${device}
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After=${device}
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[Service]
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Type=oneshot
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RemainAfterExit=yes
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ExecStart=/bin/sh -c '/sbin/veritysetup create root ${hashoffset:+--hash-offset="${hashoffset}"} "${root}" "${root}" "${roothash}"'
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ExecStop=/sbin/veritysetup remove root
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EOF
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requires_dir="${UNIT_DIR}/dev-mapper-root.device.requires"
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mkdir -p "${requires_dir}"
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ln -sf "../verity-setup.service" "${requires_dir}/verity-setup.service"
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fi
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