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[presets] add steamos files
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Philip Mueller
177
presets/steam/steamos/bin/steamos-chroot
Executable file
177
presets/steam/steamos/bin/steamos-chroot
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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DISK= # --disk=
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PARTSET= # --partset=
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SYMLINKS_DIR=/dev/disk/by-partsets
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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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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) [--disk=DISK] --partset=A|B|self|other -- COMMAND"
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echo
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echo "Run COMMAND in a chroot. The chroot is SteamOS specific, which means"
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echo "that the various SteamOS partitions are mounted within the chroot."
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echo
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echo "There are two use-cases for this command:"
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echo
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echo "1. Chroot into the 'other' SteamOS, useful for atomic update. For example:"
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echo
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echo " $(basename $0) --partset other -- COMMAND"
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echo
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echo "2. Chroot into another SteamOS install, on another disk. For example:"
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echo
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echo " $(basename $0) --disk /dev/sdb --partset A -- COMMAND"
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echo
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echo "The second mode works if SteamOS is installed alone on the disk, however"
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echo "if there are other partitions on the disk then it's not guaranteed to work."
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echo "This is because we rely on partition labels to find SteamOS partitions and"
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echo "setup the chroot. This is too fragile, and if we're unlucky there could be"
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echo "another partition that doesn't belong to SteamOS but uses the same partition"
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echo "label."
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echo
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exit $status
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}
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while [ $# -gt 0 ]; do
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case "$1" in
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-h|--help)
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usage 0
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;;
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-d|--disk)
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shift
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[ "${1:-}" ] || usage 1
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DISK=$1
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shift
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;;
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-p|--partset)
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shift
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[ "${1:-}" ] || usage 1
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PARTSET=$1
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shift
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;;
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--)
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shift
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break
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;;
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*)
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usage 1
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;;
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esac
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done
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[ "$PARTSET" ] || usage 1
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# Find devices
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ESP_DEVICE=
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EFI_DEVICE=
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ROOTFS_DEVICE=
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if [ "$DISK" ]; then
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# A disk was provided, which means that we're chrooting into another
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# SteamOS install. We do our best to 'guess' the partitions, ie. we
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# mostly rely on partition labels. This is OK if SteamOS is alone on
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# this disk, but it's fragile if it's installed along another OS.
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[ -b "$DISK" ] || fail "'$DISK' is not a block device"
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ROOTFS_DEVICE=$(get_device_by_partlabel $DISK rootfs-$PARTSET)
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EFI_DEVICE=$(get_device_by_partlabel $DISK efi-$PARTSET)
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VAR_DEVICE=$(get_device_by_partlabel $DISK var-$PARTSET)
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ESP_DEVICE=$(get_device_by_partlabel $DISK esp)
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if [ -z "$ESP_DEVICE" ]; then
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ESP_DEVICE=$(get_device_by_typeuuid $DISK \
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c12a7328-f81f-11d2-ba4b-00a0c93ec93b)
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fi
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else
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# No disk was provided, which means that we're chrooting into the
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# 'other' install, A or B. We can find these partitions reliably
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# using the existing symlinks.
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ROOTFS_DEVICE=$(realpath $SYMLINKS_DIR/$PARTSET/rootfs)
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EFI_DEVICE=$(realpath $SYMLINKS_DIR/$PARTSET/efi)
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ESP_DEVICE=$(realpath $SYMLINKS_DIR/shared/esp)
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VAR_DEVICE=$(realpath $SYMLINKS_DIR/$PARTSET/var)
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fi
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[ -b "$ROOTFS_DEVICE" ] || fail "'$ROOTFS_DEVICE' is not a block device"
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[ -b "$EFI_DEVICE" ] || fail "'$EFI_DEVICE' is not a block device"
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[ -b "$ESP_DEVICE" ] || fail "'$ESP_DEVICE' is not a block device"
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[ -b "$VAR_DEVICE" ] || fail "'$VAR_DEVICE' is not a block device"
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# Do the job
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prepare_chroot_at() {
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local dir=$1
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mount -o ro "$ROOTFS_DEVICE" $dir
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mount --bind /dev $dir/dev
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mount --bind /proc $dir/proc
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mount --bind /run $dir/run
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mount --bind /sys $dir/sys
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mount --bind /sys/firmware/efi/efivars $dir/sys/firmware/efi/efivars
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mount -t tmpfs -o size=128M tmpfs $dir/tmp
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mount "$EFI_DEVICE" $dir/efi
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mount "$ESP_DEVICE" $dir/esp
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mount "$VAR_DEVICE" $dir/var
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if [ -d $dir/var/boot ]; then
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mount --bind $dir/var/boot $dir/boot
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fi
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}
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cleanup_chroot_at() {
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local dir=$1
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if mountpoint -q $dir/boot; then
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umount $dir/boot || :
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fi
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umount $dir/var || :
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umount $dir/esp || :
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umount $dir/efi || :
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umount $dir/tmp || :
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umount $dir/sys/firmware/efi/efivars || :
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umount -R $dir/sys || :
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umount $dir/run || :
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umount -R $dir/proc || :
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umount $dir/dev || :
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umount $dir || :
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rmdir $dir
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}
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CHROOTDIR=$(mktemp -d)
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trap "cleanup_chroot_at $CHROOTDIR" EXIT
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prepare_chroot_at $CHROOTDIR
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chroot $CHROOTDIR "$@"
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