Dustin C. Hatch
c4740e4e5e
This will silence warnings from `mount` about `/etc/fstab` having changed since the last time the `systemd-fstab-generator` was run. It's not true, since it's immutable, but the warning comes up on Raspberry Pis without an RTC.
138 lines
2.4 KiB
Bash
Executable File
138 lines
2.4 KiB
Bash
Executable File
#!/bin/sh
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# vim: set sw=4 ts=4 sts=4 et :
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cleanup() {
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cd /
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if [ -n "${workdir}" ] && [ "${workdir}" != / ]; then
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rm -rf "${workdir}"
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fi
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unset workdir
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}
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die() {
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rc=$?
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if [ $rc -eq 0 ]; then
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rc=1
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fi
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error "$@"
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exit $rc
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}
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error() {
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if [ $# -eq 1 ]; then
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echo "$1" >&2
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elif [ $# -gt 1 ]; then
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printf "$@" >&2
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fi
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}
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extract_update() {
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zstd -dc update.tar.zstd | tar -x \
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|| die 'Could not extract update source'
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sha256sum -c digests \
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|| die 'Invalid update source: checksum mismatch'
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}
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fetch_update() {
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wget -O update.tar.zstd "$1"
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}
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get_root() {
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set -- $(cat /proc/cmdline)
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while [ $# -gt 0 ]; do
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case "$1" in
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root=*)
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_root=${1#root=}
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;;
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esac
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shift
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done
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echo $(findfs "${_root}")
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}
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get_partlabel() {
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blkid -o value -s PARTLABEL "$1"
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}
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help() {
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usage
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}
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info() {
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if [ $# -eq 1 ]; then
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echo "$1" >&2
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elif [ $# -gt 1 ]; then
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printf "$@" >&2
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fi
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}
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usage() {
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printf 'usage: %s source_url\n' "${0##*/}"
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}
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while [ $# -gt 0 ]; do
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case "$1" in
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--help)
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help
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exit 0
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;;
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*)
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if [ -z "${source_url}" ]; then
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source_url="$1"
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else
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usage >&2
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exit 2
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fi
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;;
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esac
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shift
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done
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if [ -z "${source_url}" ]; then
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usage >&2
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exit 2
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fi
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root=$(get_root)
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partlabel=$(get_partlabel "${root}")
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case "${partlabel}" in
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rootfs-a)
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newpartlabel=rootfs-b
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;;
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rootfs-b)
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newpartlabel=rootfs-a
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;;
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*)
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die \
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'Unsupported system configuration: invalid rootfs partition label: %s\n' \
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"${partlabel}" >&2
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esac
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newroot=$(findfs PARTLABEL="${newpartlabel}")
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if [ -z "${newroot}" ]; then
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die 'Could not find partition with label %s\n' "${partlabel}"
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fi
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info 'Current rootfs: %s (%s)\n' "${partlabel}" "${root}"
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info 'New rootfs: %s (%s)\n' "${newpartlabel}" "${newroot}"
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trap cleanup INT TERM QUIT EXIT
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workdir=$(mktemp -d)
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cd "${workdir}"
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systemctl daemon-reload
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fetch_update "${source_url}" || die 'Failed to fetch update source'
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extract_update || die 'Failed to extact update source'
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./install "${newroot}" || die 'Error installing system update'
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printf 'Do you want to reboot now? [y/N] '
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read confirm
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case "${confirm}" in
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[yY]|[yY][eE][sS])
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systemctl reboot
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;;
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*)
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info 'A reboot is required to complete the update'
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;;
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esac
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