X-Git-Url: http://git.grml.org/?a=blobdiff_plain;f=scripts%2Fcasper;h=32c4517a0331367035636901a463b5972d3d0d15;hb=40c6f4508ec0868d331e346e9d7b1c44cce01966;hp=6f7bbb022c95f2688bae104766675193063b72fc;hpb=4042b2eda2107dda511a29ae376d9724e0fd7a33;p=live-boot-grml.git diff --git a/scripts/casper b/scripts/casper index 6f7bbb0..32c4517 100644 --- a/scripts/casper +++ b/scripts/casper @@ -8,74 +8,95 @@ mountpoint=/live_media 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" +HOSTNAME="live" BUILD_SYSTEM="Debian" mkdir -p $mountpoint [ -f /etc/casper.conf ] && . /etc/casper.conf +export USERNAME USERFULLNAME HOSTNAME BUILD_SYSTEM + +. /scripts/casper-helpers + +parse_cmdline () +{ + # looking for casper specifics options as kernel parameters + for x in $(cat /proc/cmdline); do + case $x in + userfullname=*) + export USERFULLNAME=${x#userfullname=} + export CASPERCONF="changed" + ;; + hostname=*) + export HOSTNAME=${x#hostname=} + export CASPERCONF="changed" + ;; + username=*) + export USERNAME=${x#username=} + export CASPERCONF="changed" + ;; + netboot*) + export NETBOOT=${x#netboot=} ;; + toram) + export TORAM=1 ;; + todisk=*) + export TODISK=${x#todisk=} ;; + showmounts) + export SHOWMOUNTS=1 ;; + persistent) + export PERSISTENT=1 ;; + ip*) + STATICIP=${x#ip=} + if [ "${STATICIP}" == "" ]; then + STATICIP="frommedia" + fi + export STATICIP ;; + casper-getty) + export CASPERGETTY=1 ;; + console=*) + export DEFCONSOLE=$(sed -e 's%.*console=%console=%' /proc/cmdline) ;; + bootfrom=*) + export LIVEMEDIA=${x#bootfrom=} ;; + live-media=*) + export LIVEMEDIA=${x#live-media=} ;; + debian-installer/locale=*) + export LOCALE=${x#debian-installer/locale=} ;; + locale=*) + export LOCALE=${x#locale=} ;; + kbd-chooser/method=*) + export KBD=${x#kbd-chooser/method=} ;; + keyb=*) + export KBD=${x#keyb=} ;; + console-setup/layoutcode=*) + export CSLAYOUT=${x#console-setup/layoutcode=} ;; + console-setup/variantcode=*) + export CSVARIANT=${x#console-setup/variantcode=} ;; + console-setup/modelcode=*) + export CSMODEL=${x#console-setup/modelcode=} ;; + esac + done -export USERNAME USERFULLNAME HOST BUILD_SYSTEM - -if [ "${BUILD_SYSTEM}" == "Ubuntu" ]; then - MP_QUIET="-Q" -else - MP_QUIET="-q" -fi - -# looking for casper specifics options as kernel parameters -for x in $(cat /proc/cmdline); do - case $x in - userfullname*) - export USERFULLNAME=${x#userfullname=} - export CASPERCONF="changed" - ;; - host*) - export HOST=${x#host=} - export CASPERCONF="changed" - ;; - username*) - export USERNAME=${x#username=} - export CASPERCONF="changed" - ;; - netboot*) - export NETBOOT=${x#netboot=} ;; - toram) - export TORAM=1 ;; - showmounts) - export SHOWMOUNTS=1 ;; - persistent) - export PERSISTENT=1 ;; - ip*) - STATICIP=${x#ip=} - if [ "${STATICIP}" == "" ]; then - STATICIP="frommedia" - fi - export STATICIP ;; - casper-getty) - export CASPERGETTY=1 ;; - esac -done - -# sort of compatibility with netboot.h from linux docs -if [ -z "${NETBOOT}" ]; then - if [ "${ROOT}" == "/dev/nfs" ]; then - NETBOOT="nfs" - export NETBOOT - elif [ "${ROOT}" == "/dev/cifs" ]; then - NETBOOT="cifs" - export NETBOOT + # 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 -fi +} 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" ] || + if [ "$(echo $path/casper/*.squashfs)" != "$path/casper/*.squashfs" ] || [ "$(echo $path/casper/*.ext2)" != "$path/casper/*.ext2" ] || [ "$(echo $path/casper/*.dir)" != "$path/casper/*.dir" ]; then return 0 @@ -84,22 +105,8 @@ is_casper_path() { return 1 } -subdevices() { - 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*") - ;; *.squashfs|*.ext2) echo $(setup_loop "$1" "loop" "/sys/block/loop*") ;; @@ -125,10 +132,7 @@ match_files_in_dir() { 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" || + if 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" "$rootmnt" @@ -137,143 +141,66 @@ mount_images_in_directory() { fi } -sys2dev() { - sysdev=${1#/sys} - echo "/dev/$(udevinfo -q name -p ${sysdev} 2>/dev/null|| echo ${sysdev##*/})" -} - -setup_loop() { - local fspath=$1 - local module=$2 - local pattern=$3 - - modprobe "${MP_QUIET}" -b "$module" - udevsettle - - 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 $FSTYPE +is_nice_device() { + sysfs_path="${1#/sys}" + if /lib/udev/path_id "${sysfs_path}" | grep -E -q "ID_PATH=(usb|pci-[^-]*-[ide|scsi|usb])"; then return 0 fi - /lib/udev/vol_id -t $1 2>/dev/null -} - -setup_devmapper() { - backdev="$1" - rootmnt="$2" - - modprobe "${MP_QUIET}" -b 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 - - 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 $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" + return 1 } -where_is_mounted() { - device=$1 - if grep -q "^$device " /proc/mounts; then - grep "^$device " /proc/mounts | read d mountpoint rest - echo $mountpoint - return 0 - fi +is_supported_fs () +{ + # FIXME: do something better like the scan of supported filesystems + fstype="${1}" + case ${fstype} in + vfat|iso9660|udf|ext2|ext3|ntfs) + return 0 + ;; + esac return 1 } -copy_to_ram() { - copyfrom="$1" +copy_live_to() { + copyfrom="${1}" + copytodev="${2}" + copyto="${copyfrom}_swap" - if [ ! -z "${2}" ] ; then - # This will enable future rampersistence, todo yet - copyto="${2}" - moveit="False" - else - copyto="${copyfrom}_swap" - moveit="True" - fi + size=$(fs_size "" ${copyfrom} "used") - size=$(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" - [ "$quiet" != "y" ] && log_end_msg - return + if [ "${copytodev}" = "ram" ]; then + # copying to ram: + freespace=$( expr $(awk '/MemFree/{print $2}' /proc/meminfo) + $( cat /proc/meminfo | grep Cached | head -n 1 | awk '/Cached/{print $2}' - ) ) + mount_options="-o size=${size}k" + free_string="memory" + fstype="tmpfs" + dev="/dev/shm" 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 ${copyto} + # it should be a writable block device + if [ -b "${copytodev}" ]; then + dev="${copytodev}" + free_string="space" + fstype=$(get_fstype "${dev}") + freespace=$(fs_size "${dev}") + else + [ "$quiet" != "y" ] && log_warning_msg "${copytodev} is not a block device." + return 1 fi - [ "$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 $devname on /cow-backing" - fi + if [ "${freespace}" -lt "${size}" ] ; then + [ "$quiet" != "y" ] && log_warning_msg "Not enough free ${free_string} (${freespace}k > ${size}k) to copy live media in ${copytodev}." + return 1 + fi - if [ -e "${cow_backing}/${pers_label}" ]; then - echo $(setup_loop "${cow_backing}/${pers_label}" "loop" "/sys/block/loop*") - return 0 - else - umount ${cow_backing} - fi - fi - done - done + # begin copying.. + mkdir "${copyto}" + echo "mount -t ${fstype} ${mount_options} ${dev} ${copyto}" + mount -t "${fstype}" ${mount_options} "${dev}" "${copyto}" + cp -a ${copyfrom}/* ${copyto} # "cp -a" from busybox also copies hidden files + umount ${copyfrom} + mount -r -o move ${copyto} ${copyfrom} + rmdir ${copyto} + return 0 } do_netmount() { @@ -336,6 +263,107 @@ do_cifsmount() { return ${rc} } +do_snap_copy () +{ + fromdev="${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 $4}') + else + freespace=$( expr $(awk '/MemFree/{print $2}' /proc/meminfo) + $( cat /proc/meminfo | grep Cached | head -n 1 | awk '/Cached/{print $2}' - )) + fi + + tomount="/mnt/tmpsnap" + if [ ! -d "${tomount}" ] ; then + mkdir -p "${tomount}" + fi + + fstype=$(get_fstype "${fromdev}") + if [ -n "${fstype}" ]; then + # Copying stuff... + mount -t "${fstype}" -o ro "${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 ${snapfile} Snapshot" + return 1 + fi + else + # cpio.gz snapshot + if ! (cd "${snap_mount}" && zcat "${snapback}/${snapfile}" | cpio -i -u -d 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 ${snap_type}SNAP="${snap_mount}":${snapdev}:${snapfile}" >> /etc/casper.conf # for resync on reboot/halt + return 0 +} + setup_unionfs() { image_directory="$1" rootmnt="$2" @@ -384,13 +412,13 @@ setup_unionfs() { cow_fstype="tmpfs" # Looking for "${root_persistence}" device or file - if [ ! -z "${PERSISTENT}" ]; then + if [ -n "${PERSISTENT}" ]; then cowprobe=$(find_cow_device "${root_persistence}") if [ -b "${cowprobe}" ]; then cowdevice=${cowprobe} cow_fstype=$(get_fstype "${cowprobe}") else - [ "$quiet" != "y" ] && log_begin_msg "Unable to find the persistent medium" + [ "$quiet" != "y" ] && log_warning_msg "Unable to find the persistent medium" fi fi @@ -398,19 +426,23 @@ setup_unionfs() { mount -t unionfs -o dirs=/cow=rw:$rofsstring unionfs "$rootmnt" || panic "Unionfs mount failed" - # Look for a snapshot to copy - # Adding other custom mounts - if [ ! -z "${PERSISTENT}" ]; then + if [ -n "${PERSISTENT}" ]; then + # directly mount /home + # FIXME: add a custom mounts configurable system homecow=$(find_cow_device "${home_persistence}" ) if [ -b "${homecow}" ]; then - mount ${homecow} -t $(get_fstype "${homecow}") -o rw "${rootmnt}/home" - else - [ "$quiet" != "y" ] && log_begin_msg "Unable to find the persistent home medium" + mount -t $(get_fstype "${homecow}") -o rw "${homecow}" "${rootmnt}/home" + export HOMEMOUNTED=1 # used to proper calculate free space in do_snap_copy() + 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}" "${rootmnt}/home" "HOME" fi - if [ ! -z "${SHOWMOUNTS}" ]; then + if [ -n "${SHOWMOUNTS}" ]; then for d in ${rofslist}; do mkdir -p "${rootmnt}/casper/${d##*/}" case d in @@ -423,59 +455,63 @@ setup_unionfs() { fi # shows cow fs on /cow for use by casper-snapshot - mkdir -p "$rootmnt/cow" - mount -o bind /cow "$rootmnt/cow" + mkdir -p "${rootmnt}/cow" + mount -o bind /cow "${rootmnt}/cow" } -is_usb_device() { - sysfs_path="${1#/sys}" - if /lib/udev/path_id "${sysfs_path}" | grep -E -q "ID_PATH=(usb|pci-[^-]*-usb)"; then - return 0 +check_dev () +{ + sysdev="${1}" + devname="${2}" + if [ -z "${devname}" ]; then + devname=$(sys2dev "${sysdev}") + fi + fstype=$(get_fstype "${devname}") + if is_supported_fs ${fstype}; then + mount -t ${fstype} -o ro "${devname}" $mountpoint || continue + if is_casper_path $mountpoint; then + echo $mountpoint + return 0 + else + umount $mountpoint + fi fi return 1 } find_livefs() { - mounted= + # first look at the one specified in the command line + if [ ! -z "${LIVEMEDIA}" ]; then + if check_dev "null" "${LIVEMEDIA}"; then + return 0 + fi + fi + # or do the scan of block devices 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 $mountpoint + if check_dev "null" "${devname}" ; then + return 0 fi - elif is_usb_device "$sysblock"; then + elif is_nice_device "${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 $mountpoint - fi - ;; - esac + if check_dev "${dev}" ; then + return 0 + fi done - elif [ "${fstype}" = "squashfs" || \ + elif [ "${fstype}" = "squashfs" -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}.${fstype}" - return + return 0 fi done + return 1 } pulsate() { @@ -496,6 +532,8 @@ mountroot() { exec > casper.log exec 2>&1 + parse_cmdline + set_usplash_timeout [ "$quiet" != "y" ] && log_begin_msg "Running /scripts/casper-premount" pulsate @@ -517,22 +555,29 @@ mountroot() { # 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 + if [ ! -z "${livefs_root}" ]; then break fi + sleep 1 done + fi - if [ "$?" -gt 0 ]; then - panic "Unable to find a medium containing a live file system" - fi + if [ -z "${livefs_root}" ]; then + panic "Unable to find a medium containing a live file system" + fi - if [ ! -z "${TORAM}" ]; then - copy_to_ram "${livefs_root}" - fi + if [ -n "${TORAM}" ]; then + live_dest="ram" + elif [ -n "${TODISK}" ]; then + live_dest="${TODISK}" + fi + if [ -n "${live_dest}" ]; then + [ "$quiet" != "y" ] && log_begin_msg "Copying live_media to ${live_dest}" + copy_live_to "${livefs_root}" "${live_dest}" + [ "$quiet" != "y" ] && log_end_msg fi - sleep 1 - mount_images_in_directory "$livefs_root" "$rootmnt" + mount_images_in_directory "${livefs_root}" "${rootmnt}" log_end_msg