X-Git-Url: http://git.grml.org/?a=blobdiff_plain;f=scripts%2Fcasper;h=61e579c69d34ddfad3cfe94ff4541e236991c0a5;hb=a4a7503df76005df67b006e1324004c808830c32;hp=25575953b8e64b0b1a0e12752638d2b05b513671;hpb=4a0b1ba4d428c623d14bae7f0db85c80abb0da0a;p=live-boot-grml.git diff --git a/scripts/casper b/scripts/casper index 2557595..61e579c 100644 --- a/scripts/casper +++ b/scripts/casper @@ -2,39 +2,70 @@ # set -e +export PATH=/root/usr/bin:/root/usr/sbin:/root/bin:/root/sbin:/usr/bin:/usr/sbin:/bin:/sbin + mountpoint=/live_media + +# Will be mounted if found as copy on write instead of tmpfs root_persistence="casper-rw" + +# TODO +## 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-" home_persistence="home-rw" -mkdir -p $mountpoint +#overlay_method=unionfs +#if [ "${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=debian -USERFULLNAME="Debian Live user" -HOST=debian +mkdir -p $mountpoint [ -f /etc/casper.conf ] && . /etc/casper.conf export USERNAME USERFULLNAME HOST -casper_path() { # Fixme: uglyness +# looking for casper specifics options as kernel parameters +for x in $(cat /proc/cmdline); do + case $x in + netboot*) + export NETBOOT=${x#netboot=} ;; + toram) + export TORAM=1 ;; + show-cow) + export SHOWCOW=1 ;; + persistent) + export PERSISTENT=1 ;; + casper-getty) + export CASPERGETTY=1 ;; + esac +done + +# sort of compatibility with netboot.h from linux docs +if [ -z "${NETBOOT}" ]; then + if [ "${ROOT}" == "/dev/nfs" ]; then + NETBOOT="nfs" + export NETBOOT + elif [ "${ROOT}" == "/dev/cifs" ]; then + NETBOOT="cifs" + export NETBOOT + fi +fi + +is_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 "$path/casper/filesystem.squashfs" - return 0 - elif [ -e "$path/casper/filesystem.ext2" ]; then - echo "$path/casper/filesystem.ext2" - return 0 - elif [ -e "$path/casper/filesystem.xfs" ]; then - echo "$path/casper/filesystem.xfs" - return 0 + if [ -d "$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 } @@ -51,27 +82,45 @@ subdevices() { } get_backing_device() { - case "$1" in - *.cloop) - echo $(setup_loop "$1" "cloop" "/sys/block/cloop*") - ;; - *.squashfs|*.ext2|*.xfs) - echo $(setup_loop "$1" "loop" "/sys/block/loop*") - ;; - *) - panic "Unrecognized casper filesystem: $1" - ;; - esac + case "$1" in + *.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" + ;; + 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() { @@ -85,12 +134,8 @@ setup_loop() { local pattern=$3 modprobe -qb "$module" - if [ -x /sbin/udevplug ]; then - udevplug -W - else - udevtrigger - fi - + udevsettle + for loopdev in $pattern; do if [ "$(cat $loopdev/size)" -eq 0 ]; then dev=$(sys2dev "${loopdev}") @@ -103,6 +148,8 @@ setup_loop() { } get_fstype() { + #FIXME# one use of this function expects "unknown" another does not! + # which is it??? local FSTYPE local FSSIZE eval $(fstype < $1) @@ -154,175 +201,261 @@ where_is_mounted() { } copy_to_ram() { - copyto="${mountpoint}_swap" - - size=$(du -ks ${mountpoint} | cut -f1) - size=$(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 ${mountpoint}/* ${copyto} - umount ${mountpoint} - mount -r -o move ${copyto} ${mountpoint} - rmdir ${copyto} - [ "$quiet" != "y" ] && log_end_msg - fi + copyfrom="$1" + + if [ ! -z "${2}" ] ; then + # This will enable future rampersistence, todo yet + copyto="${2}" + moveit="False" + else + copyto="${copyfrom}_swap" + moveit="True" + fi + + size=$(du -ks ${copyfrom} | cut -f1) + size=$(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 ${copyfrom}/* ${copyto} # "cp -a" from busybox also copies hidden files + umount ${copyfrom} + if [ "${moveit}" == "True" ]; then + mount -r -o move ${copyto} ${copyfrom} + rmdir ${copyto} + fi + [ "$quiet" != "y" ] && log_end_msg + fi } find_cow_device() { - 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 ${cow_backing} - fi - fi - done - done + pers_label="${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() { - rofsmnt="$1" - # adapted from NFS filesystem mounting + rc=1 - modprobe -q cifs - # For DHCP - modprobe -q af_packet + modprobe -q af_packet # For DHCP - ipconfig ${DEVICE} /tmp/net-${DEVICE}.conf - if [ "x${NFSROOT}" = "xauto" ]; then - NFSROOT=${ROOTSERVER}:${ROOTPATH} - fi + ipconfig ${DEVICE} /tmp/net-${DEVICE}.conf - NFSOPTS="-ouser=root,password=" + if [ "${NFSROOT}" = "auto" ]; then + NFSROOT=${ROOTSERVER}:${ROOTPATH} + fi - [ "$quiet" != "y" ] && log_begin_msg "Mounting using mount.cifs with ${NFSROOT} ${rofsmnt} ${NFSOPTS}" - mount.cifs "${NFSROOT}" "${rofsmnt}" "${NFSOPTS}" - [ "$quiet" != "y" ] && log_end_msg + [ "$quiet" != "y" ] && log_begin_msg "Trying netboot from ${NFSROOT}" + + if [ "${NETBOOT}" != "nfs" ] && do_cifsmount ; then + rc=0 + elif do_nfsmount ; then + NETBOOT="nfs" + export NETBOOT + rc=0 + fi + + [ "$quiet" != "y" ] && log_end_msg + return ${rc} +} + +do_nfsmount() { + rc=1 + modprobe -q nfs + if [ -z "${NFSOPTS}" ]; then + NFSOPTS="" + fi + + [ "$quiet" != "y" ] && log_begin_msg "Trying nfsmount -o nolock -o ro ${NFSOPTS} ${NFSROOT} ${mountpoint}" + # FIXME: This for loop is an ugly HACK round an nfs bug + for i in 0 1 2 3 4 5 6 7 8 9 a b c d e f 10 11 12 13; do + nfsmount -o nolock -o ro ${NFSOPTS} "${NFSROOT}" "${mountpoint}" && rc=0 && break + sleep 1 + done + return ${rc} +} + +do_cifsmount() { + rc=1 + if [ -x "/sbin/mount.cifs" ]; then + if [ -z "${NFSOPTS}" ]; then + CIFSOPTS="-ouser=root,password=" + else + CIFSOPTS="${NFSOPTS}" + fi + + [ "$quiet" != "y" ] && log_begin_msg "Trying mount.cifs ${NFSROOT} ${mountpoint} ${CIFSOPTS}" + modprobe -q cifs + + if mount.cifs "${NFSROOT}" "${mountpoint}" "${CIFSOPTS}" ; then + rc=0 + fi + fi + return ${rc} } setup_unionfs() { - backdev="$1" - rootmnt="$2" - modprobe -qb unionfs - mkdir -p /cow - cowdevice="tmpfs" - cow_fstype="tmpfs" - # Looking for "${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 $cowdevice on /cow" - - mkdir -p /rofs - if grep -q netboot /proc/cmdline; then - do_netmount /rofs || panic "Can not mount netroot on /rofs" - else - if [ "$(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 $backdev on /rofs" - fi - - mount -t unionfs -o dirs=/cow=rw:/rofs=ro unionfs "$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" - - # Adding home persitence - 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 + image_directory="$1" + rootmnt="$2" + + modprobe -qb unionfs + + # run-init can't deal with this, but we're going to move all of these + # away before it runs anyway. + croot="/casper" + + # Let's just mount the read-only file systems first + rofsstring="" + rofslist="" + if [ "${NETBOOT}" == "nfs" ] ; then + roopt="nfsro" # go aroung a bug in nfs-unionfs locking + 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 "${fstype}" -o ro "${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" + + # Looking for "${root_persistence}" device or file + if [ ! -z "${PERSISTENT}" ]; 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" || panic "Unionfs mount failed" + + for d in ${rofslist}; do + mkdir -p "${rootmnt}/casper/${d##*/}" + case d in + *.dir) mount -o bind "${d}" "${rootmnt}/casper/${d##*/}" ;; + *) mount -o move "${d}" "${rootmnt}/casper/${d##*/}" ;; + esac + done + + # Adding other custom mounts + if [ ! -z "${PERSISTENT}" ]; 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 [ ! -z "${SHOWCOW}" ]; then + mkdir -p "$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_live() { - 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}" +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 is_casper_path $mountpoint; then + echo $mountpoint return + else + umount $mountpoint fi - done + elif is_usb_device "$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() { @@ -336,7 +469,7 @@ mountroot() { exec 7>&2 exec > casper.log exec 2>&1 - + set_usplash_timeout [ "$quiet" != "y" ] && log_begin_msg "Running /scripts/casper-premount" run_scripts /scripts/casper-premount @@ -347,33 +480,39 @@ mountroot() { set_usplash_timeout - for i in 0 1 2 3 4 5 6 7 8 9 a b c d e f 10 11 12 13; do - live_image=$(find_live) - if [ "${live_image}" ]; then - break + if [ ! -z "${NETBOOT}" ]; then + if do_netmount ; then + livefs_root="${mountpoint}" + else + panic "Unable to find a the network rootfs live file system" fi - sleep 1 - done - if [ "$?" -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 - fi + else + # Scan local 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 + done - setup_cow "$overlay_method" "$(get_backing_device $live_image)" "$rootmnt" + if [ "$?" -gt 0 ]; then + panic "Unable to find a medium containing a live file system" + fi + + if [ ! -z "${TORAM}" ]; then + copy_to_ram "${livefs_root}" + fi + fi + sleep 1 - # show it on new rootfs - mkdir ${rootmnt}/${mountpoint} - mount -o bind ${mountpoint} ${rootmnt}/${mountpoint} + mount_images_in_directory "$livefs_root" "$rootmnt" log_end_msg maybe_break casper-bottom [ "$quiet" != "y" ] && log_begin_msg "Running /scripts/casper-bottom" - PATH=/root/usr/bin:/root/usr/sbin:/root/bin:/root/sbin:$PATH run_scripts /scripts/casper-bottom + run_scripts /scripts/casper-bottom [ "$quiet" != "y" ] && log_end_msg exec 1>&6 6>&-