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
root_persistence="casper-rw"
home_persistence="home-rw"
root_snapshot_label="casper-sn"
home_snapshot_label="home-sn"
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/casper-helpers
if [ ! -f /casper.vars ]; then
touch /casper.vars
fi
parse_cmdline() {
for x in $(cat /proc/cmdline); do
case $x in
showmounts|show-cow)
export SHOWMOUNTS='Yes' ;;
persistent)
export PERSISTENT="Yes" ;;
nopersistent)
export PERSISTENT="" ;;
union=*)
export UNIONFS="${x#union=}";;
ignore_uuid)
IGNORE_UUID="Yes" ;;
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() {
path=$1
if [ -d "$path/$LIVE_MEDIA_PATH" ]; then
if [ "$(echo $path/$LIVE_MEDIA_PATH/*.squashfs)" != \
"$path/$LIVE_MEDIA_PATH/*.squashfs" ] ||
[ "$(echo $path/$LIVE_MEDIA_PATH/*.ext2)" != \
"$path/$LIVE_MEDIA_PATH/*.ext2" ] ||
[ "$(echo $path/$LIVE_MEDIA_PATH/*.dir)" != \
"$path/$LIVE_MEDIA_PATH/*.dir" ]; then
return 0
fi
fi
return 1
}
matches_uuid() {
if [ "$IGNORE_UUID" ] || [ ! -e /conf/uuid.conf ]; then
return 0
fi
path="$1"
uuid="$(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|*.ext2)
echo $(setup_loop "$1" "loop" "/sys/block/loop*")
;;
*.dir)
echo "directory"
;;
*)
panic "Unrecognized casper filesystem: $1"
;;
esac
}
match_files_in_dir() {
# Does any files match pattern $1 ?
local pattern="$1"
if [ "$(echo $pattern)" != "$pattern" ]; then
return 0
fi
return 1
}
mount_images_in_directory() {
directory="$1"
rootmnt="$2"
if match_files_in_dir "$directory/$LIVE_MEDIA_PATH/*.squashfs" ||
match_files_in_dir "$directory/$LIVE_MEDIA_PATH/*.ext2" ||
match_files_in_dir "$directory/$LIVE_MEDIA_PATH/*.dir"; then
setup_unionfs "$directory/$LIVE_MEDIA_PATH" "$rootmnt"
else
:
fi
}
is_nice_device() {
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 ${sysfs_path} | grep -q "^/block/dm-"; then
return 0
fi
return 1
}
copy_live_to() {
copyfrom="${1}"
copytodev="${2}"
copyto="${copyfrom}_swap"
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 ${copyto}
return 0
}
do_snap_copy ()
{
fromdev="${1}"
todir="${2}"
snap_type="${3}"
size=$(fs_size "${fromdev}" "" "used")
if [ -b "${fromdev}" ]; then
# look for free mem
if [ -n "${HOMEMOUNTED}" -a "${snap_type}" = "HOME" ]; then
todev=$(cat /proc/mounts | grep -s " $(base_path ${todir}) " | awk '{print $1}' )
freespace=$(df -k | grep -s ${todev} | awk '{print $4}')
else
freespace=$(awk '/^MemFree:/{f=$2} /^Cached:/{c=$2} END{print f+c}' /proc/meminfo)
fi
tomount="/mnt/tmpsnap"
if [ ! -d "${tomount}" ] ; then
mkdir -p "${tomount}"
fi
fstype=$(get_fstype "${fromdev}")
if [ -n "${fstype}" ]; then
# Copying stuff...
mount -t "${fstype}" -o ro,noatime "${fromdev}" "${tomount}"
cp -a "${tomount}"/* ${todir}
umount "${tomount}"
else
log_warning_msg "Unrecognized fstype: ${fstype} on ${fromdev}:${snap_type}"
fi
rmdir "${tomount}"
if echo ${fromdev} | grep -qs loop; then
losetup -d "${fromdev}"
fi
return 0
else
return 1
[ "$quiet" != "y" ] && \
log_warning_msg "Unable to find the snapshot ${snap_type} medium"
fi
}
try_snap ()
{
# Look for $snap_label.* in block devices and copy the contents to $snap_mount
# and remember the device and filename for resync on exit in casper.init
snap_label="${1}"
snap_mount="${2}"
snap_type="${3}"
snapdata=$(find_files "${snap_label}.squashfs ${snap_label}.cpio.gz ${snap_label}.ext2")
if [ ! -z "${snapdata}" ]; then
snapdev="$(echo ${snapdata} | cut -f1 -d ' ')"
snapback="$(echo ${snapdata} | cut -f2 -d ' ')"
snapfile="$(echo ${snapdata} | cut -f3 -d ' ')"
if echo "${snapfile}" | grep -qs '\(squashfs\|ext2\)'; then
# squashfs or ext2 snapshot
dev=$(get_backing_device "${snapback}/${snapfile}")
if ! do_snap_copy "${dev}" "${snap_mount}" "${snap_type}"; then
log_warning_msg "Impossible to include the ${snapfile} Snapshot"
return 1
fi
else
# cpio.gz snapshot
# Unfortunately klibc's cpio is incompatible with the rest of
# the world; everything else requires -u -d, while klibc doesn't
# implement them. Try to detect whether it's in use.
cpiopath="$(which cpio)" || true
if [ "$cpiopath" ] && grep -aq /lib/klibc "$cpiopath"; then
cpioargs=
else
cpioargs='-u -d'
fi
if ! (cd "${snap_mount}" && zcat "${snapback}/${snapfile}" | cpio -i $cpioargs 2>/dev/null) ; then
log_warning_msg "Impossible to include the ${snapfile} Snapshot"
return 1
fi
fi
umount "${snapback}"
else
dev=$(find_cow_device "${snap_label}")
if [ -b ${dev} ]; then
if echo "${dev}" | grep -qs loop; then
# strange things happens, user confused?
snaploop=$( losetup ${dev} | awk '{print $3}' | tr -d '()' )
snapfile=$(basename ${snaploop})
snapdev=$(cat /proc/mounts | awk '{print $2,$1}' | grep -es "^$( dirname ${snaploop} )" | cut -f2 -d ' ')
else
snapdev="${dev}"
fi
if ! do_snap_copy "${dev}" "${snap_mount}" "${snap_type}" ; then
log_warning_msg "Impossible to include the ${snap_label} Snapshot"
return 1
else
if [ -n "${snapfile}" ]; then
# it was a loop device, user confused
umount ${snapdev}
fi
fi
else
log_warning_msg "Impossible to include the ${snap_label} Snapshot"
return 1
fi
fi
echo "export ${snap_type}SNAP="/cow${snap_mount#$rootmnt}":${snapdev}:${snapfile}" >> /etc/casper.conf # for resync on reboot/halt
return 0
}
setup_unionfs() {
image_directory="$1"
rootmnt="$2"
case ${UNIONFS} in
aufs|unionfs)
modprobe "${MP_QUIET}" -b ${UNIONFS} || true
;;
esac
# run-init can't deal with images in a subdir, but we're going to
# move all of these away before it runs anyway. No, we're not,
# put them in / since move-mounting them into / breaks mono and
# some other apps.
croot="/"
# Let's just mount the read-only file systems first
rofsstring=""
rofslist=""
if [ "${NETBOOT}" = "nfs" ] ; then
roopt="nfsro" # work around a bug in nfs-unionfs locking
elif [ "${UNIONFS}" = "aufs" ]; then
roopt="rr"
else
roopt="ro"
fi
mkdir -p "${croot}"
for image_type in "ext2" "squashfs" "dir" ; do
for image in "${image_directory}"/*."${image_type}"; do
imagename=$(basename "${image}")
if [ -d "${image}" ]; then
# it is a plain directory: do nothing
rofsstring="${image}=${roopt}:${rofsstring}"
rofslist="${image} ${rofslist}"
elif [ -f "${image}" ]; then
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} ${rofslist}"
fi
done
done
rofsstring=${rofsstring%:}
mkdir -p /cow
cowdevice="tmpfs"
cow_fstype="tmpfs"
cow_mountopt="rw,noatime,mode=755"
# Looking for "${root_persistence}" device or file
if [ -n "${PERSISTENT}" ]; then
cowprobe=$(find_cow_device "${root_persistence}")
if [ -b "${cowprobe}" ]; then
cowdevice=${cowprobe}
cow_fstype=$(get_fstype "${cowprobe}")
cow_mountopt="rw,noatime"
else
[ "$quiet" != "y" ] && \
log_warning_msg "Unable to find the persistent medium"
fi
fi
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 "${UNIONFS} mount failed"
# Adding other custom mounts
if [ -n "${PERSISTENT}" ]; then
# directly mount /home
# FIXME: add a custom mounts configurable system
homecow=$(find_cow_device "${home_persistence}" )
if [ -b "${homecow}" ]; then
mount -t $(get_fstype "${homecow}") -o rw,noatime \
"${homecow}" "${rootmnt}/home"
# Used to proper calculate free space in do_snap_copy()
export HOMEMOUNTED=1
else
[ "$quiet" != "y" ] && \
log_warning_msg "Unable to find the persistent home medium"
fi
# Look for other snapshots to copy in
try_snap "${root_snapshot_label}" "${rootmnt}" "ROOT"
try_snap "${home_snapshot_label}" "${rootmnt}/home" "HOME"
fi
if [ -n "${SHOWMOUNTS}" ]; then
for d in ${rofslist}; do
mkdir -p "${rootmnt}/${LIVE_MEDIA_PATH}/${d##*/}"
case d in
*.dir)
# do nothing
;;
*)
mount -o move "${d}" \
"${rootmnt}/${LIVE_MEDIA_PATH}/${d##*/}"
;;
esac
done
# shows cow fs on /cow for use by casper-snapshot
mkdir -p "${rootmnt}/cow"
mount -o bind /cow "${rootmnt}/cow"
fi
# XXX: hardcode the image name for now (xtraeme).
# move the first mount.
mkdir -p "${rootmnt}/rofs"
mount -o move /filesystem.squashfs "${rootmnt}/rofs"
}
check_dev ()
{
sysdev="${1}"
devname="${2}"
skip_uuid_check="${3}"
if [ -z "${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 "${loopdevname}"
fi
return 1
}
find_livefs() {
timeout="${1}"
# 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" -o \
"${fstype}" = "ext4" -o \
"${fstype}" = "ext3" -o \
"${fstype}" = "ext2" ]; then
# This is an ugly hack situation, the block device has
# an image directly on it. It's hopefully
# casper, so take it and run with it.
ln -s "${devname}" "${devname}.${fstype}"
echo "${devname}.${fstype}"
return 0
fi
done
return 1
}
mountroot() {
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 [ "$i" -lt 60 ]; do
livefs_root=$(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}" "${live_dest}"
log_end_msg
fi
mount_images_in_directory "${livefs_root}" "${rootmnt}"
maybe_break casper-bottom
log_begin_msg "Running /scripts/casper-bottom"
run_scripts /scripts/casper-bottom
log_end_msg
}