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author | Jannis Pohlmann <jannis.pohlmann@codethink.co.uk> | 2012-03-27 14:04:44 +0000 |
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committer | Jannis Pohlmann <jannis.pohlmann@codethink.co.uk> | 2012-03-27 14:08:32 +0000 |
commit | fc8198fff8b634172b48c7dab087da4eb3a5e754 (patch) | |
tree | 2729f9b2f2e677c7a5e7f499d3e3b4b1cb601c08 /tb-switch/tb-switch | |
parent | 54d222fc53cdc96fec8ac156e9d3e41d520e0bcd (diff) | |
download | tbdiff-fc8198fff8b634172b48c7dab087da4eb3a5e754.tar.gz |
Rename tbdiff-switch to tb-switch.
Diffstat (limited to 'tb-switch/tb-switch')
-rwxr-xr-x | tb-switch/tb-switch | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/tb-switch/tb-switch b/tb-switch/tb-switch new file mode 100755 index 0000000..79568d5 --- /dev/null +++ b/tb-switch/tb-switch @@ -0,0 +1,83 @@ +#!/bin/sh +# +# Copyright (c) 2011-2012 Codethink Ltd. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License Version 2 as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License along +# with this program; if not, write to the Free Software Foundation, Inc., +# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +# vi:set ts=8 sw=8 noet ai nocindent: + +set -e +set -x + +# read input parameters +device="$1" +target_subvolume="$2" + +# print usage information if not all parameters are provided +if [ -z "$device" ] || + [ -z "$target_subvolume" ] +then + echo "Usage: $0 <device> <target subvolume>" >&2 + exit 1 +fi + +# mount the root btrfs file system +rootfs="$(busybox mktemp -d)" +mount -t btrfs "$device" "$rootfs" +trap "cd /; umount $rootfs && busybox rm -rf $rootfs" EXIT SIGINT SIGTERM + +# switch into the root file system +cd "$rootfs" + +# verify that the target subvolume exists +if [ ! -e "$target_subvolume" ]; then + echo "Target subvolume \"$target_subvolume\" does not yet exist" >&2 + exit 1 +fi + +# delete the target subvolume's -run snapshot if it exists +if [ -e "$target_subvolume-run" ]; then + echo "Deleting existing snapshot \"$target_subvolume-run\"" + btrfs subvolume delete "$target_subvolume-run" +fi + +echo "Creating snapshot \"$target_subvolume-run\" from \"$target_subvolume\"" + +# create a a new -run snapshot for the target subvolume +btrfs subvolume snapshot "$target_subvolume" "$target_subvolume-run" + +echo "Copying boot files to the root file system" + +# copy boot files to the root file system +busybox cp "$target_subvolume/boot/vmlinuz" "boot/vmlinuz" +busybox cp "$target_subvolume/boot/System.map" "boot/System.map" +busybox cp "$target_subvolume/extlinux.conf" "extlinux.conf" + +echo "Configuring extlinux to boot from \"$target_subvolume-run\"" + +busybox sed -i -e "s,factory-run,$target_subvolume-run,g" "extlinux.conf" + +# clear the traps +trap - EXIT SIGINT SIGTERM + +# leave the root file system +cd / + +# unmount the root file system +umount "$rootfs" + +# remove the temporary directory +busybox rm -rf "$rootfs" + +# reboot the system +busybox reboot |