Created
April 19, 2014 02:30
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A Chromebook init script to mount the CROUTON partition - made possible via @drinkcat's crouton/separate_partition branch
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# Copyright (c) 2012 The Chromium OS Authors. All rights reserved. | |
# Use of this source code is governed by a BSD-style license that can be | |
# found in the LICENSE file. | |
description "mount CROUTON on /var/crouton" | |
author "drinkcat & DennisLfromGA" | |
start on starting boot-services | |
task | |
script | |
# Exits the script with return code $1, spitting out message $@ to stderr | |
error() { | |
local ecode="$1" | |
shift | |
echo "$*" 1>&2 | |
exit "$ecode" | |
} | |
# Find the root device | |
# Sets: | |
# - $ROOTDEVICE as the root device (e.g. /dev/sda or /dev/mmcblk0) | |
# - $ROOTDEVICEPREFIX as a prefix for partitions (/dev/sda, /dev/mmcblk0p) | |
findrootdevice() { | |
ROOTDEVICE="`rootdev -d -s`" | |
if [ -z "$ROOTDEVICE" ]; then | |
error 1 "Cannot find root device." | |
fi | |
if [ ! -b "$ROOTDEVICE" ]; then | |
error 1 "$ROOTDEVICE is not a block device." | |
fi | |
# If $ROOTDEVICE ends with a number (e.g. mmcblk0), partitions are named | |
# ${ROOTDEVICE}pX (e.g. mmcblk0p1). If not (e.g. sda), they are named | |
# ${ROOTDEVICE}X (e.g. sda1). | |
ROOTDEVICEPREFIX="$ROOTDEVICE" | |
if [ "${ROOTDEVICE%[0-9]}" != "$ROOTDEVICE" ]; then | |
ROOTDEVICEPREFIX="${ROOTDEVICE}p" | |
fi | |
} | |
# Define CROUTON mountpoint | |
MOUNTCROUTON='/var/crouton' | |
# Try to mount the CROUTON partition, if it exists, on $MOUNTCROUTON. | |
mountcrouton() { | |
if [ -z "$ROOTDEVICE" ]; then | |
findrootdevice | |
fi | |
local croutonpart="`sudo cgpt find -n -l CROUTON "$ROOTDEVICE"`" | |
if [ -z "$croutonpart" ]; then | |
return 1 | |
fi | |
# Check if crouton is mounted already | |
if grep -q "^${ROOTDEVICEPREFIX}$croutonpart " /proc/mounts; then | |
# If mounted, it must be mounted to $mountpoint | |
if ! grep -q "^${ROOTDEVICEPREFIX}$croutonpart $MOUNTCROUTON " \ | |
/proc/mounts; then | |
error 1 "Error: CROUTON partition is not mounted on $MOUNTCROUTON." | |
else | |
PRIOR=' already' | |
fi | |
else | |
sudo mkdir -p "$MOUNTCROUTON" || error 1 "Cannot create $MOUNTCROUTON." | |
sudo mount "${ROOTDEVICEPREFIX}$croutonpart" "$MOUNTCROUTON" || \ | |
error 1 "Cannot mount $MOUNTCROUTON" | |
fi | |
return 0 | |
} | |
# Now mount the CROUTON partition | |
mountcrouton | |
end script |
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For starting a crouton chroot auto-magically without entering the shell, see companion file crouton.conf.