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Setup script to run Steam on Chromebook using a library on an external SD card.
set -o nounset
# 2016-01-02 updated to use whichever device the card is mounted on.
# 2016-07-28 update to use ext4 or fuseblk
# Params
# 1. where ChromeOS mounts your SD card
sd_mount="/var/host/media/removable/SD Card"
# 2. where you want to mount your card with custom flags
# 3. replace ext4 as appropriate with one of: vfat,fuseblk
# Derived params
# Clean up orphaned mounts
mount | grep "${custom_sd_mount}" >/dev/null
if [[ $? -eq 0 ]]; then
# Our custom mount is in the mount table. Check if we can 'ls' in it
ls ${custom_sd_mount} >/dev/null 2>&1
if [[ ! $? -eq 0 ]]; then
echo "Orphaned mount detected: ${custom_sd_mount}"
umount ${custom_sd_mount}
if [[ $? -eq 0 ]]; then
echo "Unmount succeeded for ${custom_sd_mount}"
echo "Unmount failed, run with sudo"
exit 5
# Set up the normal mount if needed, since Chrome 38 removed automounting of ext4.
# After Chrome 38 this is unused, the "SD Card" mount will be present.
# mount | grep "${sd_mount}" >/dev/null
# if [[ ! $? -eq 0 ]]; then
# echo "Could not find default SD mount ${sd_mount}, mounting"
# mount ${sd_device} "${sd_mount}"
# if [[ ! $? -eq 0 ]]; then
# echo "Abort, failed to mount card."
# exit 1
# fi
# mount_proof=$(mount | grep ${sd_device})
# echo "Mounted SD as ${mount_proof}"
# fi
# If SD card is plugged in, get the device name
card_mount=`mount | grep "${sd_mount}"`
if [[ -z "${card_mount}" ]]; then
echo "Abort: Could not find SD device ${sd_mount}, card not plugged in"
exit 6
sd_device=`echo ${card_mount} | cut -f1 -d' '`
echo "SD device is ${sd_device}"
# check Steam and make our custom mount if needed
if [[ ! -d "${default_mount}" ]]; then
echo "Abort: Could not find Steam in default location ${default_mount}"
exit 3
if [[ ! -d "${home_mount}" ]]; then
# mount SD card in home dir with exec permissions
mount -t ${sd_format} -o defaults,nosuid,nodev ${sd_device} ${custom_sd_mount}
if [[ ! -d "${home_mount}" ]]; then
echo "Abort: Executed mount with type ${sd_format} but can't find home mount ${home_mount}"
exit 4
echo "SteamApps is now mounted to ${home_mount}"
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