void-packages/srcpkgs/xbps-casper/files/scripts/casper

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#!/bin/sh
# set -e
export PATH=/usr/bin:/usr/sbin:/bin:/sbin
mountpoint=/cdrom
LIVE_MEDIA_PATH=casper
LIVE_ROOTFS=filesystem.squashfs
USERNAME=casper
USERFULLNAME="Live session user"
HOST=live
BUILD_SYSTEM=Custom
mkdir -p $mountpoint
tried=/tmp/tried
[ -f /etc/casper.conf ] && . /etc/casper.conf
export USERNAME USERFULLNAME HOST BUILD_SYSTEM
. /scripts/functions
. /scripts/casper-helpers
if [ ! -f /casper.vars ]; then
touch /casper.vars
fi
parse_cmdline()
{
for x in $(cat /proc/cmdline); do
case $x in
union=*)
export UNIONFS="${x#union=}";;
ignore_uuid)
IGNORE_UUID="Yes" ;;
live-rootfs=*)
LIVE_ROOTFS="${x#live-rootfs=}"
export LIVE_ROOTFS
echo "export LIVE_ROOTFS=\"$LIVE_ROOTFS\"" >> /etc/casper.conf ;;
live-media-path=*)
LIVE_MEDIA_PATH="${x#live-media-path=}"
export LIVE_MEDIA_PATH
echo "export LIVE_MEDIA_PATH=\"$LIVE_MEDIA_PATH\"" >> /etc/casper.conf ;;
toram)
export TORAM="Yes" ;;
todisk=*)
export TODISK="${x#todisk=}" ;;
esac
done
if [ "${UNIONFS}" = "" ]; then
export UNIONFS="unionfs"
fi
}
is_casper_path()
{
local path=$1
if [ -d "$path/$LIVE_MEDIA_PATH" ]; then
if [ "$(echo $path/$LIVE_MEDIA_PATH/*.squashfs)" != \
"$path/$LIVE_MEDIA_PATH/*.squashfs" ]; then
return 0
fi
fi
return 1
}
matches_uuid()
{
if [ "$IGNORE_UUID" ] || [ ! -e /conf/uuid.conf ]; then
return 0
fi
local path="$1"
local uuid="$(cat /conf/uuid.conf)"
for try_uuid_file in "$path/.disk/casper-uuid"*; do
[ -e "$try_uuid_file" ] || continue
try_uuid="$(cat "$try_uuid_file")"
if [ "$uuid" = "$try_uuid" ]; then
return 0
fi
done
return 1
}
get_backing_device()
{
case "$1" in
*.squashfs)
echo $(setup_loop "$1" "loop" "/sys/block/loop*")
;;
*)
panic "Unrecognized casper filesystem: $1"
;;
esac
}
mount_image_in_directory()
{
local directory="$1"
local rootmnt="$2"
if [ ! -f "$directory/$LIVE_MEDIA_PATH/$LIVE_ROOTFS" ]; then
panic "Cannot find $directory/$LIVE_MEDIA_PATH/$LIVE_ROOTFS"
fi
setup_unionfs "$directory/$LIVE_MEDIA_PATH" "$rootmnt"
}
is_nice_device()
{
local sysfs_path="${1#/sys}"
if /lib/udev/path_id "${sysfs_path}" | egrep -q "ID_PATH=(usb|pci-[^-]*-(ide|scsi|usb)|platform-orion-ehci|platform-
mmc|platform-mxsdhci)"; then
return 0
fi
if echo ${sysfs_path} | grep -q "^/block/dm-"; then
return 0
fi
return 1
}
copy_live_to()
{
local copyfrom="${1}"
local copytodev="${2}"
local copyto="${copyfrom}_swap"
local size freespace mount_options free_string fstype dev
size=$(fs_size "" ${copyfrom} "used")
if [ "${copytodev}" = "ram" ]; then
# copying to ram:
freespace=$(awk '/^MemFree:/{f=$2} /^Cached:/{c=$2} END{print f+c}' /proc/meminfo)
mount_options="-o size=${size}k"
free_string="memory"
fstype="tmpfs"
dev="/dev/shm"
else
# it should be a writable block device
if [ -b "${copytodev}" ]; then
dev="${copytodev}"
free_string="space"
fstype=$(get_fstype "${dev}")
freespace=$(fs_size "${dev}")
else
[ "$quiet" != "y" ] && \
log_warning_msg "${copytodev} is not a block device."
return 1
fi
fi
if [ "${freespace}" -lt "${size}" ] ; then
[ "$quiet" != "y" ] && log_warning_msg "Not enough free ${free_string} (${freespace}k > ${size}k) to copy live media in ${copytodev}."
return 1
fi
# begin copying..
mkdir "${copyto}"
echo "mount -t ${fstype} ${mount_options} ${dev} ${copyto}"
mount -t "${fstype}" ${mount_options} "${dev}" "${copyto}"
# "cp -a" from busybox also copies hidden files
cp -a ${copyfrom}/* ${copyto}
umount ${copyfrom}
mount -r -o move ${copyto} ${copyfrom}
rmdir ${copyto}
return 0
}
setup_unionfs()
{
local image_directory="$1"
local rootmnt="$2"
local croot rofsstring rofslist roopt image imagename backdev
local fstype cowdevice cow_fstrype cow_mountopt
case ${UNIONFS} in
aufs|unionfs)
modprobe "${MP_QUIET}" -b ${UNIONFS} || true
;;
esac
# run-init can't deal with images in a subdir, but we're going to
# move all of these away before it runs anyway. No, we're not,
# put them in / since move-mounting them into / breaks mono and
# some other apps.
croot="/"
# Let's just mount the read-only file systems first
rofsstring=""
rofslist=""
if [ "${UNIONFS}" = "aufs" ]; then
roopt="rr"
else
roopt="ro"
fi
mkdir -p "${croot}"
image="${image_directory}/${LIVE_ROOTFS}"
imagename=$(basename "$image")
backdev=$(get_backing_device "$image")
fstype=$(get_fstype "${backdev}")
if [ "${fstype}" = "unknown" ]; then
panic "Unknown file system type on ${backdev} (${image})"
fi
mkdir -p "${croot}/${imagename}"
mount -t "${fstype}" -o ro,noatime "${backdev}" "${croot}/${imagename}" \
|| panic "Can not mount $backdev ($image) on ${croot}/${imagename}"
rofsstring="${croot}/${imagename}=${roopt}:${rofsstring}"
rofslist="${croot}/${imagename} ${rofslist}"
rofsstring=${rofsstring%:}
mkdir -p /cow
cowdevice="tmpfs"
cow_fstype="tmpfs"
cow_mountopt="rw,noatime,mode=755"
mount -t ${cow_fstype} -o ${cow_mountopt} ${cowdevice} \
/cow || panic "Can not mount $cowdevice on /cow"
mount -t ${UNIONFS} -o noatime,dirs=/cow=rw:$rofsstring \
${UNIONFS} "$rootmnt" || panic "${UNIONFS} mount failed"
# move the first mount.
mkdir -p "${rootmnt}/rofs"
mount -o move ${croot}${imagename} "${rootmnt}/rofs"
}
check_dev()
{
local sysdev="${1}"
local devname="${2}"
local skip_uuid_check="${3}"
local loopdevname devuid
if [ -z "${devname}" ]; then
devname=$(sys2dev "${sysdev}")
fi
if [ -d "${devname}" ]; then
mount -o bind "${devname}" $mountpoint || continue
if is_casper_path $mountpoint; then
echo $mountpoint
return 0
else
umount $mountpoint
fi
fi
[ -e "$devname" ] || continue
if [ -n "${LIVEMEDIA_OFFSET}" ]; then
loopdevname=$(setup_loop "${devname}" "loop" "/sys/block/loop*" "${LIVEMEDIA_OFFSET}")
devname="${loopdevname}"
fi
fstype=$(get_fstype "${devname}")
if is_supported_fs ${fstype}; then
devuid=$(blkid -o value -s UUID "$devname")
[ -n "$devuid" ] && grep -qs "\<$devuid\>" $tried && continue
mount -t ${fstype} -o ro,noatime "${devname}" $mountpoint || continue
[ -n "$devuid" ] && echo "$devuid" >> $tried
if is_casper_path $mountpoint && \
([ "$skip_uuid_check" ] || matches_uuid $mountpoint); then
echo $mountpoint
return 0
else
umount $mountpoint
fi
fi
if [ -n "${LIVEMEDIA_OFFSET}" ]; then
losetup -d "${loopdevname}"
fi
return 1
}
find_livefs()
{
local timeout="${1}"
local devname fstype dev
# first look at the one specified in the command line
if [ ! -z "${LIVEMEDIA}" ]; then
if check_dev "null" "${LIVEMEDIA}" "skip_uuid_check"; then
return 0
fi
fi
# don't start autodetection before timeout has expired
if [ -n "${LIVEMEDIA_TIMEOUT}" ]; then
if [ "${timeout}" -lt "${LIVEMEDIA_TIMEOUT}" ]; then
return 1
fi
fi
# or do the scan of block devices
for sysblock in \
$(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|fd)"); do
devname=$(sys2dev "${sysblock}")
[ -e "$devname" ] || continue
fstype=$(get_fstype "${devname}")
if /lib/udev/cdrom_id ${devname} > /dev/null; then
if check_dev "null" "${devname}" ; then
return 0
fi
elif is_nice_device "${sysblock}" ; then
for dev in $(subdevices "${sysblock}"); do
if check_dev "${dev}" ; then
return 0
fi
done
elif [ "${fstype}" = "squashfs" ]; then
# This is an ugly hack situation, the block device has
# an image directly on it. It's hopefully
# casper, so take it and run with it.
ln -s "${devname}" "${devname}.${fstype}"
echo "${devname}.${fstype}"
return 0
fi
done
return 1
}
mountroot()
{
local i livefs_root live_dest
parse_cmdline
wait_for_udev 10
maybe_break casper-premount
log_begin_msg "Running /scripts/casper-premount"
run_scripts /scripts/casper-premount
log_end_msg
# Scan local devices for the image
i=0
while [ "$i" -lt 10 ]; do
livefs_root=$(find_livefs $i)
[ -n "${livefs_root}" ] && break
sleep 1
i="$(($i + 1))"
done
if [ -z "${livefs_root}" ]; then
panic "Unable to find a medium containing a live file system"
fi
if [ "${TORAM}" ]; then
live_dest="ram"
elif [ "${TODISK}" ]; then
live_dest="${TODISK}"
fi
if [ "${live_dest}" ]; then
log_begin_msg "Copying live_media to ${live_dest}"
copy_live_to "${livefs_root}" "${live_dest}"
log_end_msg
fi
mount_image_in_directory "${livefs_root}" "${rootmnt}"
maybe_break casper-bottom
log_begin_msg "Running /scripts/casper-bottom"
run_scripts /scripts/casper-bottom
log_end_msg
}