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[presets] add steamos files
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Philip Mueller
204
presets/steam/steamos/bin/steamos-partsets
Executable file
204
presets/steam/steamos/bin/steamos-partsets
Executable file
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#!/bin/bash
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# -*- mode: sh; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
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# vim: et sts=4 sw=4
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# SPDX-License-Identifier: LGPL-2.1+
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#
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# Copyright © 2019-2020 Collabora Ltd.
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# Copyright © 2019-2020 Valve Corporation.
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#
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# This file is part of steamos-customizations.
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#
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# steamos-customizations is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public License as
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# published by the Free Software Foundation; either version 2.1 of the License,
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# or (at your option) any later version.
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set -e
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set -u
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OUTDIR= # $1
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DEVICES= # --devices=
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[ -e /usr/lib/steamos/steamos-partitions-lib ] && \
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. /usr/lib/steamos/steamos-partitions-lib || \
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{ echo "Failed to source '/usr/lib/steamos/steamos-partitions-lib'"; exit 1; }
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# Helpers
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log () { echo >&2 "$@"; }
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fail() { echo >&2 "$@"; exit 1; }
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usage() {
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local status=${1-2}
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if [ $status -ne 0 ]; then
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exec >&2
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fi
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echo
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echo "Usage: $(basename $0) [--devices 'efi esp-A esp-B ...'] OUTDIR"
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echo
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echo "In the output directory, this script creates 4 files that define the SteamOS"
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echo "partition definitions: all, self, other, shared."
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echo
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echo "The output directory should not exist."
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echo
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echo "This program starts off the / mountpoint, and from there it guesses the disk"
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echo "on which SteamOS is installed, if the current root partition belongs to A or B,"
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echo "and then which partitions belong to 'self', 'other' or 'shared'."
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echo
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echo "It is assumed that all partitions on the disk belong to SteamOS, unless you"
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echo "use --devices to provide a space-separated list of partitions. In such case,"
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echo "only the partitions that belong to this list are kept."
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echo
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echo "This program should be used during the build of a SteamOS disk image,"
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echo "and also when SteamOS is installed to another disk. Apart from that,"
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echo "I don't see any other use-cases."
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echo
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exit $status
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}
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# Handle arguments
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while [ $# -gt 0 ]; do
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case "$1" in
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-h|--help)
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usage 0
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;;
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--devices)
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shift
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DEVICES=$1
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shift
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;;
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*)
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if ! [ "$OUTDIR" ]; then OUTDIR=$1; shift; continue; fi
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usage 1
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;;
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esac
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done
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[ -n "$OUTDIR" ] || fail "Too few argument"
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# Get to know who we are: A, B or dev?
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ROOTDEV=$(find_device_for_mountpoint_deep '/')
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[ -b "$ROOTDEV" ] || fail "Failed to get device for '/'"
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ROOTLABEL=$(get_partlabel "$ROOTDEV")
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[ "$ROOTLABEL" ] || fail "Failed to get partition label for '$ROOTDEV'"
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SELF=$(get_partition_set "$ROOTLABEL")
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[ "$SELF" ] || fail "Failed to determine partition set for label '$ROOTLABEL'"
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OTHER=
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case "$SELF" in
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(A) OTHER=B;;
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(B) OTHER=A;;
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esac
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[ "$OTHER" ] || [ "$SELF" == "dev" ] || fail "Failed to determine 'other' for self=$SELF"
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# Get the disk on which SteamOS lives
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DISK=$(get_parent_device "$ROOTDEV")
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[ -b "$DISK" ] || fail "Failed to get disk for root device '$ROOTDEV'"
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# We know everything, let's go
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log "SteamOS root device: $ROOTDEV ($ROOTLABEL)"
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log "SteamOS disk : $DISK"
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log "A/B/dev status : self=$SELF, other=$OTHER"
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log "Creating partition definitions in $OUTDIR ..."
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[ -e "$OUTDIR" ] && fail "'$OUTDIR' already exists"
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mkdir -p "$OUTDIR"
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while read device partuuid typeuuid partlabel; do
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# NOTE that 'type-uuid' and 'name' might not be set, and that break us.
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# Ie. if type-uuid is not set, but name is set, then we end up with
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# name assigned to typeuuid, which is problematic.
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#
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# Well it's not that bad, as we expect caller to provide a list of
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# partitions in case there's more than one OS on the disk, and all
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# those partitions belong to SteamOS (so we know that we set all
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# those fields), EXCEPT for the ESP, which is shared with other OS.
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#
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# So we identify the ESP based on the typeuuid, which means that we
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# must take care that sfdisk outputs the typeuuid before the label,
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# in case there's no label set.
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# If a device list was provided by caller, accept only those,
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# otherwise assume all devices on the disk belong to SteamOS.
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accepted=0
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if [ -z "$DEVICES" ]; then
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accepted=1
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else
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for d in $DEVICES; do
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if [ "$d" == "$device" ]; then
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accepted=1
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break
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fi
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done
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fi
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if [ $accepted -eq 0 ]; then
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log "Discarding partition '$device' ($partlabel), not part of SteamOS"
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continue
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fi
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# Hack for ESP, as it's the only one which doesn't belong to
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# SteamOS, hence we can't control the name. So we identify it
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# using the type uuid, and pretend that the name is 'esp'.
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if [ "${typeuuid,,}" == c12a7328-f81f-11d2-ba4b-00a0c93ec93b ]; then
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partlabel=esp
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fi
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if [ ! "$partlabel" ]; then
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log "Discarding partition '$device', label is empty"
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continue
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fi
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# Guess partition set (A, B or dev) and linkname from label.
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partset=$(get_partition_set "$partlabel")
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linkname=$(get_partition_linkname "$partlabel")
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partuuid=${partuuid,,}
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group=
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# Find the group, based on partset
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case "$partset" in
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("")
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group=shared
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;;
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("$SELF")
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group=self
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echo "$linkname $partuuid" >> "$OUTDIR/$partset"
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if [ "$SELF" == "dev" ]; then
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echo "$linkname $partuuid" >> "$OUTDIR/dev"
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fi
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;;
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("$OTHER")
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group=other
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echo "$linkname $partuuid" >> "$OUTDIR/$partset"
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;;
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("dev")
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group=dev
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;;
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("A")
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group=A
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;;
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("B")
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group=B
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;;
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(*)
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log "Discarding partition '$partlabel' with unexpected suffix '$partset'"
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continue
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;;
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esac
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# Add to partition definition files
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echo "$linkname $partuuid" >> "$OUTDIR/$group"
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echo "$partlabel $partuuid" >> "$OUTDIR/all"
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done < <(sfdisk -ql -o device,uuid,type-uuid,name "$DISK" | tail +2)
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