X-Git-Url: http://git.grml.org/?a=blobdiff_plain;f=scripts%2Fcasper;h=2375bb6c2cbedfb96067b1fc2073c12be2e048b4;hb=9a7f83110cfb153d853f5d074968a661121d4e07;hp=3d8c453dac2945f388769c47741fe0545efb5390;hpb=f3299e0f07d9c0207db455cb9ea131e3b3c13784;p=live-boot-grml.git diff --git a/scripts/casper b/scripts/casper index 3d8c453..2375bb6 100644 --- a/scripts/casper +++ b/scripts/casper @@ -4,306 +4,466 @@ export PATH=/root/usr/bin:/root/usr/sbin:/root/bin:/root/sbin:/usr/bin:/usr/sbin:/bin:/sbin -mountpoint=/cdrom +mountpoint=/live_media -mkdir -p $mountpoint +# Will be mounted if found as copy on write instead of tmpfs +persistence_pattern="casper-rw" + +# Each file found with this pattern will be mounted directly in the +# mountpoint extracted from file name "${other_mounts_pattern}" +other_mounts_pattern="casper-mount-" +netboot="" + +#overlay_method=unionfs +#if [ "${DPKG_ARCH}" = "ia64" ] || [ "${DPKG_ARCH}" = "hppa" ] || [ "${DPKG_ARCH}" = "sparc" ]; then +# overlay_method=devmapper +#fi -overlay_method=unionfs -if [ "${DPKG_ARCH}" = "ia64" ] || [ "${DPKG_ARCH}" = "hppa" ] || [ "${DPKG_ARCH}" = "sparc" ]; then - overlay_method=devmapper -fi +USERNAME="casper" +USERFULLNAME="Live session user" +HOST="live" -USERNAME=ubuntu -USERFULLNAME="Ubuntu LiveCD user" -HOST=ubuntu +mkdir -p $mountpoint [ -f /etc/casper.conf ] && . /etc/casper.conf export USERNAME USERFULLNAME HOST -casper_path() { - path=$1 - if [ -e "$path/casper/filesystem.cloop" ]; then - echo "$path/casper/filesystem.cloop" - return 0 - elif [ -e "$path/casper/filesystem.squashfs" ]; then - echo "$path/casper/filesystem.squashfs" - return 0 - fi - return 1 +is_casper_path() { + path=$1 + if [ -d "$path/casper" ]; then + if [ "$(echo $path/casper/*.cloop)" != "$path/casper/*.cloop" ] || + [ "$(echo $path/casper/*.squashfs)" != "$path/casper/*.squashfs" ] || + [ "$(echo $path/casper/*.ext2)" != "$path/casper/*.ext2" ] || + [ "$(echo $path/casper/*.dir)" != "$path/casper/*.dir" ]; then + return 0 + fi + fi + return 1 } subdevices() { - sysblock=$1 - r="" - for dev in "${sysblock}" "${sysblock}"/*; do - if [ -e "${dev}/dev" ]; then - r="${r} ${dev}" - fi - done - echo ${r} + sysblock=$1 + r="" + for dev in "${sysblock}" "${sysblock}"/*; do + if [ -e "${dev}/dev" ]; then + r="${r} ${dev}" + fi + done + echo ${r} } get_backing_device() { case "$1" in - *.cloop) - echo $(setup_loop "$1" "cloop" "/sys/block/cloop*") + *.cloop) + echo $(setup_loop "$1" "cloop" "/sys/block/cloop*") + ;; + *.squashfs|*.ext2) + echo $(setup_loop "$1" "loop" "/sys/block/loop*") + ;; + *.dir) + echo "directory" + ;; + *) + panic "Unrecognized casper filesystem: $1" ;; - *.squashfs) - echo $(setup_loop "$1" "loop" "/sys/block/loop*") - ;; - *) - panic "Unrecognized casper filesystem: $1" - ;; esac } -setup_cow() { - case "$1" in - unionfs) - setup_unionfs "$2" "$rootmnt" - ;; - devmapper) - setup_devmapper "$2" "$rootmnt" - 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/casper/*.cloop"; then + # Let's hope there's just one matching *.cloop... FIXME + setup_devmapper $(get_backing_device "$directory/casper/*.cloop") "$rootmnt" + elif match_files_in_dir "$directory/casper/*.squashfs" || + match_files_in_dir "$directory/casper/*.ext2" || + match_files_in_dir "$directory/casper/*.dir"; then + setup_unionfs "$directory/casper" "$rootmnt" + else + : + fi } sys2dev() { - sysdev=${1#/sys} - echo "/dev/$(udevinfo -q name -p ${sysdev} 2>/dev/null|| echo ${sysdev##*/})" + sysdev=${1#/sys} + echo "/dev/$(udevinfo -q name -p ${sysdev} 2>/dev/null|| echo ${sysdev##*/})" } setup_loop() { - local fspath=$1 - local module=$2 - local pattern=$3 - - modprobe -Qb "$module" - udevplug -W - - for loopdev in $pattern; do - if [ "$(cat $loopdev/size)" -eq 0 ]; then - dev=$(sys2dev "${loopdev}") - losetup "$dev" "$fspath" - echo "$dev" - return 0 - fi - done - panic "No loop devices available" + local fspath=$1 + local module=$2 + local pattern=$3 + + modprobe -qb "$module" + if [ -x /sbin/udevplug ]; then + udevplug -W + else + udevtrigger + fi + + for loopdev in $pattern; do + if [ "$(cat $loopdev/size)" -eq 0 ]; then + dev=$(sys2dev "${loopdev}") + losetup "$dev" "$fspath" + echo "$dev" + return 0 + fi + done + panic "No loop devices available" } get_fstype() { - local FSTYPE - local FSSIZE - eval $(fstype < $1) - if [ "$FSTYPE" != "unknown" ]; then - echo $FSTYPE - return 0 - fi - /lib/udev/vol_id -t $1 2>/dev/null + #FIXME# one use of this function expects "unknown" another does not! + # which is it??? + local FSTYPE + local FSSIZE + eval $(fstype < $1) + if [ "$FSTYPE" != "unknown" ]; then + echo $FSTYPE + return 0 + fi + /lib/udev/vol_id -t $1 2>/dev/null } setup_devmapper() { - backdev="$1" - rootmnt="$2" + backdev="$1" + rootmnt="$2" - modprobe -Qb dm-mod - COW_DEVICE=/dev/ram1 - COW_NAME="casper-cow" + modprobe -qb dm-mod + COW_DEVICE=/dev/ram1 + COW_NAME="casper-cow" - BACKING_FILE_SIZE=$(blockdev --getsize "$backdev") - MAX_COW_SIZE=$(blockdev --getsize "$COW_DEVICE") - CHUNK_SIZE=8 # sectors + BACKING_FILE_SIZE=$(blockdev --getsize "$backdev") + MAX_COW_SIZE=$(blockdev --getsize "$COW_DEVICE") + CHUNK_SIZE=8 # sectors - if [ -z "$COW_SIZE" -o "$COW_SIZE" -gt "$MAX_COW_SIZE" ]; then - COW_SIZE=$MAX_COW_SIZE - fi + if [ -z "$COW_SIZE" -o "$COW_SIZE" -gt "$MAX_COW_SIZE" ]; then + COW_SIZE=$MAX_COW_SIZE + fi - echo "0 $COW_SIZE linear $COW_DEVICE 0" | dmsetup create $COW_NAME + echo "0 $COW_SIZE linear $COW_DEVICE 0" | dmsetup create $COW_NAME - echo "0 $BACKING_FILE_SIZE snapshot $backdev /dev/mapper/$COW_NAME p $CHUNK_SIZE" | \ - dmsetup create casper-snapshot - if [ "$(get_fstype $backdev)" = "unknown" ]; then - panic "Unknown file system type on $backdev" - fi - mount -t $(get_fstype "$backdev") /dev/mapper/casper-snapshot $rootmnt || panic "Can not mount /dev/mapper/casper/snapshot on $rootmnt" + echo "0 $BACKING_FILE_SIZE snapshot $backdev /dev/mapper/$COW_NAME p $CHUNK_SIZE" | \ + dmsetup create casper-snapshot + if [ "$(get_fstype $backdev)" = "unknown" ]; then + panic "Unknown file system type on $backdev" + fi + mount -t $(get_fstype "$backdev") /dev/mapper/casper-snapshot $rootmnt || panic "Can not mount /dev/mapper/casper/snapshot on $rootmnt" - mkdir -p "$rootmnt/rofs" - echo "0 $BACKING_FILE_SIZE linear $backdev 0" | dmsetup create casper-backing - mount -t $(get_fstype "$backdev") /dev/mapper/casper-backing "$rootmnt/rofs" + mkdir -p "$rootmnt/rofs" + echo "0 $BACKING_FILE_SIZE linear $backdev 0" | dmsetup create casper-backing + mount -t $(get_fstype "$backdev") /dev/mapper/casper-backing "$rootmnt/rofs" } where_is_mounted() { - device=$1 - if grep -q "^$device " /proc/mounts; then - grep "^$device " /proc/mounts | read d mountpoint rest - echo $mountpoint - return 0 - fi - return 1 + device=$1 + if grep -q "^$device " /proc/mounts; then + grep "^$device " /proc/mounts | read d mountpoint rest + echo $mountpoint + return 0 + fi + return 1 +} + +copy_to_ram() { + copyform="$1" + copyto="${copyform}_swap" + + size=$(du -ks ${copyform} | cut -f1) + size=$(expr ${size} + ${size}/20 ) # Fixme: 5% more to be sure + needed_space=$(expr ${size} * 1024) + freespace=$( expr $(awk '/MemFree/{print $2}' /proc/meminfo) + $( cat /proc/meminfo | grep Cached | head -n 1 | awk '/Cached/{print $2}' - )) + + if [ ! ${freespace} -lt ${needed_space} ] ; then + [ "$quiet" != "y" ] && log_begin_msg "Not enough free memory to copy to ram" + [ "$quiet" != "y" ] && log_end_msg + return + else + [ "$quiet" != "y" ] && log_begin_msg "Copying live media to ram..." + mkdir "${copyto}" + mount -t tmpfs -o size=${size}k /dev/shm ${copyto} + cp -a ${copyform}/* ${copyto} + umount ${copyform} + mount -r -o move ${copyto} ${copyform} + rmdir ${copyto} + [ "$quiet" != "y" ] && log_end_msg + fi } find_cow_device() { - for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop); do - for dev in $(subdevices "${sysblock}"); do - devname=$(sys2dev "${dev}") - if [ "$(/lib/udev/vol_id -l $devname 2>/dev/null)" = "casper-rw" ]; then - echo "$devname" - return - elif [ "$(get_fstype ${devname})" = "vfat" ]; then - mkdir -p /cow-backing - if where_is_mounted ${devname} > /dev/null; then - mount -o remount,rw ${devname} $(where_is_mounted ${devname}) || panic "Remounting failed" - mount -o bind $(where_is_mounted ${devname}) /cow-backing || panic "Cannot bind-mount" - else - mount -t $(get_fstype "${devname}") -o rw "${devname}" /cow-backing || panic "Cannot mount $devname on /cow-backing" - fi - - if [ -e "/cow-backing/casper-rw" ]; then - echo $(setup_loop "/cow-backing/casper-rw" "loop" "/sys/block/loop*") - return 0 - else - umount /cow-backing - fi - fi - - done - done - return 1 + pers_label="${1}" + cow_backing="/${pers_label}-backing" + for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop); do + for dev in $(subdevices "${sysblock}"); do + devname=$(sys2dev "${dev}") + if [ "$(/lib/udev/vol_id -l $devname 2>/dev/null)" = "${pers_label}" ]; then + echo "$devname" + return + elif [ "$(get_fstype ${devname})" = "vfat" ]; then + mkdir -p "${cow_backing}" + if where_is_mounted ${devname} > /dev/null; then + mount -o remount,rw ${devname} $(where_is_mounted ${devname}) || panic "Remounting failed" + mount -o bind $(where_is_mounted ${devname}) ${cow_backing} || panic "Cannot bind-mount" + else + mount -t $(get_fstype "${devname}") -o rw "${devname}" ${cow_backing} || panic "Cannot mount $devname on /cow-backing" + fi + + if [ -e "${cow_backing}/${pers_label}" ]; then + echo $(setup_loop "${cow_backing}/${pers_label}" "loop" "/sys/block/loop*") + return 0 + else + umount ${cow_backing} + fi + fi + done + done +} + +do_netmount() { + # Will mount a remote share and return the mountpoint + + modprobe -q nfs + # For DHCP + modprobe -q af_packet + + ipconfig ${DEVICE} /tmp/net-${DEVICE}.conf + if [ "x${NFSROOT}" = "xauto" ]; then + NFSROOT=${ROOTSERVER}:${ROOTPATH} + fi + + #choose NFS or CIFS mount + if [ ${netboot} = "NFS" ] ; then + echo $(do_nfsmount) + else + echo $(do_cifsmount) + fi +} + +do_nfsmount() { + if [ "x${NFSOPTS}" = "x" ]; then + NFSOPTS="" + fi + + [ "$quiet" != "y" ] && log_begin_msg "Mounting NFS with nfsmount -o nolock -o ro ${NFSOPTS} ${NFSROOT} ${mountpoint}" + while true ; do + nfsmount -o nolock -o ro ${NFSOPTS} "${NFSROOT}" "${mountpoint}" && break + sleep 1 + done + echo "${mountpoint}" + # FIXME: add error check + [ "$quiet" != "y" ] && log_end_msg +} + +do_cifsmount() { + NFSOPTS="-ouser=root,password=" + + [ "$quiet" != "y" ] && log_begin_msg "Mounting using mount.cifs with ${NFSROOT} ${mountpoint} ${NFSOPTS}" + mount.cifs "${NFSROOT}" "${mountpoint}" "${NFSOPTS}" && echo "${mountpoint}" + # FIXME: add error check + [ "$quiet" != "y" ] && log_end_msg } setup_unionfs() { - backdev="$1" + image_directory="$1" rootmnt="$2" - modprobe -Qb unionfs - mkdir -p /cow - - if grep -q persistent /proc/cmdline; then - i=0 - # We love udev and the kernel! - while [ "$i" -lt 300 ]; do - cowdevice=$(find_cow_device) - if [ -b "$cowdevice" ]; then - mount -t $(get_fstype "$cowdevice") -o rw "$cowdevice" /cow || panic "Can not mount $cowdevice on /cow" - break - fi - sleep 5 -# sleep 0.1 - i=$(( $i + 1 )) - done - else - mount -t tmpfs tmpfs /cow - fi - - mkdir -p /rofs - if [ "$(get_fstype $backdev)" = "unknown" ]; then - panic "Unknown file system type on $backdev" - fi - mount -t $(get_fstype "$backdev") -o ro "$backdev" /rofs || panic "Can not mount $backdev on /rofs" - - mount -t unionfs -o dirs=/cow=rw:/rofs=ro unionfs "$rootmnt" - if grep -q show-cow /proc/cmdline; then - mkdir -p "$rootmnt/cow" - mount -o bind /cow "$rootmnt/cow" - fi - mkdir -p "$rootmnt/rofs" - mount -o bind /rofs "$rootmnt/rofs" + image_type="$3" + + modprobe -qb unionfs + croot="" # Should really be /casper, but run-init doesn't handle + # mount-points in subdirectories at all + + # Let's just mount the read-only file systems first + rofsstring="" + rofslist="" + mkdir -p "${croot}" + for image_type in "ext2" "squashfs" "dir" ; do + for image in "${image_directory}"/*."${image_type}"; do + imagename=$(basename "${image}") + if [ -d "${image}" ]; then + # it is a plain directory: do nothing + rofslist="${image} ${rofslist}" + rofsstring="${image}=ro:${rofsstring}" + elif [ -f "${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 "${fstype}" -o ro "${backdev}" "${croot}/${imagename}" || panic "Can not mount $backdev ($image) on ${croot}/${imagename}" && rofsstring="${croot}/${imagename}=ro:${rofsstring}" && rofslist="${croot}/${imagename} ${rofslist}" + fi + done + done + rofsstring=${rofsstring%:} + + mkdir -p /cow + cowdevice="tmpfs" + cow_fstype="tmpfs" + + # Looking for "${root_persistence}" device or file + if grep -q persistent /proc/cmdline; then + cowprobe=$(find_cow_device "${root_persistence}") + if [ -b "${cowprobe}" ]; then + cowdevice=${cowprobe} + cow_fstype=$(get_fstype "${cowprobe}") + else + [ "$quiet" != "y" ] && log_begin_msg "Unable to find the persistent medium" + fi + fi + + mount ${cowdevice} -t ${cow_fstype} -o rw /cow || panic "Can not mount $cowdevice on /cow" + + mount -t unionfs -o dirs=/cow=rw:$rofsstring unionfs "$rootmnt" + + for d in ${rofslist}; do + mkdir -p "${rootmnt}/casper/${d}" + mount -o bind "${d}" "${rootmnt}/${d}" + case d in + *.dir) ;; # do nothing + *) umount "${d}" ;; + esac + done + + # Adding other custom mounts + if grep -q homepersistence /proc/cmdline; then + homecow=$(find_cow_device "${home_persistence}" ) + if [ -b "${homecow}" ]; then + mount ${homecow} -t $(get_fstype "${homecow}") -o rw "${rootmnt}/home" + else + [ "$quiet" != "y" ] && log_begin_msg "Unable to find the persistent home medium" + fi + fi + + if grep -q show-cow /proc/cmdline; then + mkdir -p "$rootmnt/cow" + mount -o bind /cow "$rootmnt/cow" + fi } is_usb_device() { sysfs_path="${1#/sys}" - if /lib/udev/path_id "${sysfs_path}" | grep -q "ID_PATH=usb"; then + if /lib/udev/path_id "${sysfs_path}" | grep -Eq "ID_PATH=(usb|pci-[^-]*-usb)"; then return 0 fi return 1 } -find_cd() { +find_livefs() { mounted= - for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop | grep -v ram); do - devname=$(sys2dev "${sysblock}") - fstype=$(get_fstype "${devname}") - if /lib/udev/cdrom_id ${devname} > /dev/null; then - mount -t ${fstype} -o ro "$devname" $mountpoint || continue - if casper_path $mountpoint; then - echo $(casper_path $mountpoint) - return - else - umount $mountpoint - fi - elif is_usb_device "$sysblock"; then - for dev in $(subdevices "${sysblock}"); do - devname=$(sys2dev "${dev}") - fstype=$(get_fstype "${devname}") - case ${fstype} in - vfat|iso9660|udf) - mount -t ${fstype} -o ro "${devname}" $mountpoint || continue - if casper_path $mountpoint; then - echo $(casper_path $mountpoint) - return - else - umount $mountpoint - fi - ;; - esac - done - elif [ "${fstype}" = "squashfs" ]; then - - # This is an ugly hack situation, the block device has - # a squashfs image directly on it. It's hopefully - # casper, so take it and run with it. - - ln -s "${devname}" "${devname}.${fstype}" - echo "${devname}.${fstype}" - return - fi - done + for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop | grep -v ram); do + devname=$(sys2dev "${sysblock}") + fstype=$(get_fstype "${devname}") + if /lib/udev/cdrom_id ${devname} > /dev/null; then + mount -t ${fstype} -o ro "$devname" $mountpoint || continue + if is_casper_path $mountpoint; then + echo $mountpoint + return + else + umount $mountpoint + fi + elif is_usb_device "$sysblock"; then + for dev in $(subdevices "${sysblock}"); do + devname=$(sys2dev "${dev}") + fstype=$(get_fstype "${devname}") + case ${fstype} in + vfat|iso9660|udf) + mount -t ${fstype} -o ro "${devname}" $mountpoint || continue + if is_casper_path $mountpoint; then + echo $mountpoint + return + else + umount $mountpoint + fi + ;; + esac + done + elif [ "${fstype}" = "squashfs" || \ + "${fstype}" = "ext2" ]; then + + # This is an ugly hack situation, the block device has + # an image directly on it. It's hopefully + # casper, so take it and run with it. + + ln -s "${devname}" "${devname}.${fstype}" + echo "${devname}.${fstype}" + return + fi + done } set_usplash_timeout() { - if [ -x /sbin/usplash_write ]; then - /sbin/usplash_write "TIMEOUT 120" - fi + if [ -x /sbin/usplash_write ]; then + /sbin/usplash_write "TIMEOUT 120" + fi } mountroot() { - exec 6>&1 - exec 7>&2 - exec > casper.log - exec 2>&1 - - set_usplash_timeout - [ "$quiet" != "y" ] && log_begin_msg "Running /scripts/casper-premount" - run_scripts /scripts/casper-premount - [ "$quiet" != "y" ] && log_end_msg - - # Needed here too because some things (*cough* udev *cough*) - # changes the timeout - - set_usplash_timeout - - for i in 0 1 2 3 4 5 6 7 8 9 a b c d e f 10 11 12 13; do - live_image=$(find_cd) - if [ "${live_image}" ]; then - break - fi - sleep 1 - done - if [ "$?" -gt 0 ]; then - panic "Unable to find a CD-ROM containing a live file system" - fi - - setup_cow "$overlay_method" "$(get_backing_device $live_image)" "$rootmnt" - - log_end_msg - - maybe_break casper-bottom - [ "$quiet" != "y" ] && log_begin_msg "Running /scripts/casper-bottom" - - run_scripts /scripts/casper-bottom - [ "$quiet" != "y" ] && log_end_msg - - exec 1>&6 6>&- - exec 2>&7 7>&- - cp casper.log "${rootmnt}/var/log/" + exec 6>&1 + exec 7>&2 + exec > casper.log + exec 2>&1 + + set_usplash_timeout + [ "$quiet" != "y" ] && log_begin_msg "Running /scripts/casper-premount" + run_scripts /scripts/casper-premount + [ "$quiet" != "y" ] && log_end_msg + + # Needed here too because some things (*cough* udev *cough*) + # changes the timeout + + set_usplash_timeout + + if grep -q netboot /proc/cmdline; then + netboot="CIFS" + for x in $(cat /proc/cmdline); do + case $x in + netboot=*) + netboot=${x#netboot=} + ;; + esac + done + livefs_root=$(do_netboot) + else + # Scan devices for the image + for i in 0 1 2 3 4 5 6 7 8 9 a b c d e f 10 11 12 13; do + livefs_root=$(find_livefs) + if [ "${livefs_root}" ]; then + break + fi + sleep 1 + done + fi + + if [ "$?" -gt 0 ]; then + panic "Unable to find a medium containing a live file system" + fi + + if grep -q toram /proc/cmdline; then + copy_to_ram "${livefs_root}" + fi + + mount_images_in_directory "$livefs_root" "$rootmnt" + + log_end_msg + + maybe_break casper-bottom + [ "$quiet" != "y" ] && log_begin_msg "Running /scripts/casper-bottom" + + run_scripts /scripts/casper-bottom + [ "$quiet" != "y" ] && log_end_msg + + exec 1>&6 6>&- + exec 2>&7 7>&- + cp casper.log "${rootmnt}/var/log/" }