614 lines
18 KiB
Bash
614 lines
18 KiB
Bash
#!/bin/sh
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# set -e
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export PATH=/usr/bin:/usr/sbin:/bin:/sbin
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mountpoint=/cdrom
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LIVE_MEDIA_PATH=casper
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root_persistence="casper-rw"
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home_persistence="home-rw"
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root_snapshot_label="casper-sn"
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home_snapshot_label="home-sn"
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USERNAME=casper
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USERFULLNAME="Live session user"
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HOST=live
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BUILD_SYSTEM=Custom
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mkdir -p $mountpoint
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[ -f /etc/casper.conf ] && . /etc/casper.conf
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export USERNAME USERFULLNAME HOST BUILD_SYSTEM
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. /scripts/casper-helpers
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if [ ! -f /casper.vars ]; then
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touch /casper.vars
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fi
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parse_cmdline() {
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for x in $(cat /proc/cmdline); do
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case $x in
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toram)
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export TORAM='Yes' ;;
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showmounts|show-cow)
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export SHOWMOUNTS='Yes' ;;
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persistent)
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export PERSISTENT="Yes" ;;
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nopersistent)
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export PERSISTENT="" ;;
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union=*)
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export UNIONFS="${x#union=}";;
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ip*)
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STATICIP=${x#ip=}
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if [ "${STATICIP}" = "" ]; then
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STATICIP="frommedia"
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fi
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export STATICIP ;;
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ignore_uuid)
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IGNORE_UUID="Yes" ;;
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live-media-path=*)
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LIVE_MEDIA_PATH="${x#live-media-path=}"
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export LIVE_MEDIA_PATH
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echo "export LIVE_MEDIA_PATH=\"$LIVE_MEDIA_PATH\"" \
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>> /etc/casper.conf ;;
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esac
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done
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if [ "${UNIONFS}" = "" ]; then
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export UNIONFS="unionfs"
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fi
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}
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is_casper_path() {
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path=$1
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if [ -d "$path/$LIVE_MEDIA_PATH" ]; then
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if [ "$(echo $path/$LIVE_MEDIA_PATH/*.squashfs)" != \
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"$path/$LIVE_MEDIA_PATH/*.squashfs" ] ||
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[ "$(echo $path/$LIVE_MEDIA_PATH/*.ext2)" != \
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"$path/$LIVE_MEDIA_PATH/*.ext2" ] ||
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[ "$(echo $path/$LIVE_MEDIA_PATH/*.dir)" != \
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"$path/$LIVE_MEDIA_PATH/*.dir" ]; then
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return 0
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fi
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fi
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return 1
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}
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matches_uuid() {
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if [ "$IGNORE_UUID" ] || [ ! -e /conf/uuid.conf ]; then
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return 0
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fi
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path="$1"
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uuid="$(cat /conf/uuid.conf)"
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for try_uuid_file in "$path/.disk/casper-uuid"*; do
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[ -e "$try_uuid_file" ] || continue
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try_uuid="$(cat "$try_uuid_file")"
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if [ "$uuid" = "$try_uuid" ]; then
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return 0
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fi
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done
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return 1
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}
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get_backing_device() {
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case "$1" in
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*.squashfs|*.ext2)
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echo $(setup_loop "$1" "loop" "/sys/block/loop*")
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;;
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*.dir)
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echo "directory"
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;;
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*)
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panic "Unrecognized casper filesystem: $1"
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;;
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esac
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}
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match_files_in_dir() {
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# Does any files match pattern $1 ?
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local pattern="$1"
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if [ "$(echo $pattern)" != "$pattern" ]; then
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return 0
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fi
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return 1
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}
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mount_images_in_directory() {
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directory="$1"
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rootmnt="$2"
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if match_files_in_dir "$directory/$LIVE_MEDIA_PATH/*.squashfs" ||
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match_files_in_dir "$directory/$LIVE_MEDIA_PATH/*.ext2" ||
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match_files_in_dir "$directory/$LIVE_MEDIA_PATH/*.dir"; then
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setup_unionfs "$directory/$LIVE_MEDIA_PATH" "$rootmnt"
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else
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:
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fi
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}
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is_nice_device() {
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sysfs_path="${1#/sys}"
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if /lib/udev/path_id "${sysfs_path}" | grep -E -q "ID_PATH=(usb|pci-[^-]*-(ide|scsi|usb)|platform-mmc|platform-mxsdhci)"; then
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return 0
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fi
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return 1
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}
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copy_live_to() {
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copyfrom="${1}"
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copytodev="${2}"
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copyto="${copyfrom}_swap"
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size=$(fs_size "" ${copyfrom} "used")
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if [ "${copytodev}" = "ram" ]; then
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# copying to ram:
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freespace=$( expr $(awk '/MemFree/{print $2}' /proc/meminfo) + $( cat /proc/meminfo | grep Cached | head -n 1 | awk '/Cached/{print $2}' - ) )
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mount_options="-o size=${size}k"
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free_string="memory"
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fstype="tmpfs"
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dev="/dev/shm"
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else
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# it should be a writable block device
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if [ -b "${copytodev}" ]; then
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dev="${copytodev}"
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free_string="space"
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fstype=$(get_fstype "${dev}")
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freespace=$(fs_size "${dev}")
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else
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[ "$quiet" != "y" ] && \
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log_warning_msg "${copytodev} is not a block device."
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return 1
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fi
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fi
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if [ "${freespace}" -lt "${size}" ] ; then
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[ "$quiet" != "y" ] && log_warning_msg "Not enough free ${free_string} (${freespace}k > ${size}k) to copy live media in ${copytodev}."
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return 1
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fi
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# begin copying..
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mkdir "${copyto}"
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echo "mount -t ${fstype} ${mount_options} ${dev} ${copyto}"
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mount -t "${fstype}" ${mount_options} "${dev}" "${copyto}"
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# "cp -a" from busybox also copies hidden files
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cp -a ${copyfrom}/* ${copyto}
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umount ${copyfrom}
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mount -r -o move ${copyto} ${copyfrom}
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rmdir ${copyto}
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return 0
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}
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do_netmount() {
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rc=1
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modprobe "${MP_QUIET}" af_packet # For DHCP
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/sbin/udevadm trigger --action=add
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/sbin/udevadm settle
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ipconfig ${DEVICE} /tmp/net-${DEVICE}.conf | tee /netboot.config
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if [ "${NFSROOT}" = "auto" ]; then
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NFSROOT=${ROOTSERVER}:${ROOTPATH}
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fi
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[ "$quiet" != "y" ] && log_begin_msg "Trying netboot from ${NFSROOT}"
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if [ "${NETBOOT}" != "nfs" ] && do_cifsmount ; then
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rc=0
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elif do_nfsmount ; then
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NETBOOT="nfs"
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export NETBOOT
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rc=0
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fi
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[ "$quiet" != "y" ] && log_end_msg
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return ${rc}
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}
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do_nfsmount() {
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rc=1
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modprobe "${MP_QUIET}" nfs
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if [ -z "${NFSOPTS}" ]; then
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NFSOPTS=""
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fi
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[ "$quiet" != "y" ] && \
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log_begin_msg "Trying nfsmount -o nolock -o ro ${NFSOPTS} ${NFSROOT} ${mountpoint}"
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# FIXME: This while loop is an ugly HACK round an nfs bug
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i=0
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while [ "$i" -lt 60 ]; do
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nfsmount -o nolock -o ro ${NFSOPTS} "${NFSROOT}" \
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"${mountpoint}" && rc=0 && break
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sleep 1
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i="$(($i + 1))"
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done
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return ${rc}
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}
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do_cifsmount() {
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rc=1
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if [ -x "/sbin/mount.cifs" ]; then
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if [ -z "${NFSOPTS}" ]; then
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CIFSOPTS="-ouser=root,password="
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else
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CIFSOPTS="${NFSOPTS}"
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fi
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[ "$quiet" != "y" ] && \
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log_begin_msg "Trying mount.cifs ${NFSROOT} ${mountpoint} ${CIFSOPTS}"
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modprobe "${MP_QUIET}" cifs
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if mount.cifs "${NFSROOT}" "${mountpoint}" "${CIFSOPTS}" ; then
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rc=0
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fi
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fi
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return ${rc}
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}
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do_snap_copy ()
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{
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fromdev="${1}"
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todir="${2}"
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snap_type="${3}"
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size=$(fs_size "${fromdev}" "" "used")
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if [ -b "${fromdev}" ]; then
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# look for free mem
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if [ -n "${HOMEMOUNTED}" -a "${snap_type}" = "HOME" ]; then
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todev=$(cat /proc/mounts | grep -s " $(base_path ${todir}) " | awk '{print $1}' )
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freespace=$(df -k | grep -s ${todev} | awk '{print $4}')
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else
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freespace=$( expr $(awk '/MemFree/{print $2}' /proc/meminfo) + $( cat /proc/meminfo | grep Cached | head -n 1 | awk '/Cached/{print $2}' - ))
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fi
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tomount="/mnt/tmpsnap"
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if [ ! -d "${tomount}" ] ; then
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mkdir -p "${tomount}"
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fi
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fstype=$(get_fstype "${fromdev}")
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if [ -n "${fstype}" ]; then
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# Copying stuff...
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mount -t "${fstype}" -o ro,noatime "${fromdev}" "${tomount}"
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cp -a "${tomount}"/* ${todir}
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umount "${tomount}"
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else
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log_warning_msg "Unrecognized fstype: ${fstype} on ${fromdev}:${snap_type}"
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fi
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rmdir "${tomount}"
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if echo ${fromdev} | grep -qs loop; then
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losetup -d "${fromdev}"
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fi
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return 0
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else
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return 1
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[ "$quiet" != "y" ] && \
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log_warning_msg "Unable to find the snapshot ${snap_type} medium"
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fi
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}
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try_snap ()
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{
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# Look for $snap_label.* in block devices and copy the contents to $snap_mount
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# and remember the device and filename for resync on exit in casper.init
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snap_label="${1}"
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snap_mount="${2}"
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snap_type="${3}"
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snapdata=$(find_files "${snap_label}.squashfs ${snap_label}.cpio.gz ${snap_label}.ext2")
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if [ ! -z "${snapdata}" ]; then
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snapdev="$(echo ${snapdata} | cut -f1 -d ' ')"
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snapback="$(echo ${snapdata} | cut -f2 -d ' ')"
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snapfile="$(echo ${snapdata} | cut -f3 -d ' ')"
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if echo "${snapfile}" | grep -qs '\(squashfs\|ext2\)'; then
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# squashfs or ext2 snapshot
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dev=$(get_backing_device "${snapback}/${snapfile}")
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if ! do_snap_copy "${dev}" "${snap_mount}" "${snap_type}"; then
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log_warning_msg "Impossible to include the ${snapfile} Snapshot"
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return 1
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fi
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else
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# cpio.gz snapshot
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# Unfortunately klibc's cpio is incompatible with the rest of
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# the world; everything else requires -u -d, while klibc doesn't
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# implement them. Try to detect whether it's in use.
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cpiopath="$(which cpio)" || true
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if [ "$cpiopath" ] && grep -aq /lib/klibc "$cpiopath"; then
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cpioargs=
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else
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cpioargs='-u -d'
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fi
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if ! (cd "${snap_mount}" && zcat "${snapback}/${snapfile}" | cpio -i $cpioargs 2>/dev/null) ; then
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log_warning_msg "Impossible to include the ${snapfile} Snapshot"
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return 1
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fi
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fi
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umount "${snapback}"
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else
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dev=$(find_cow_device "${snap_label}")
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if [ -b ${dev} ]; then
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if echo "${dev}" | grep -qs loop; then
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# strange things happens, user confused?
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snaploop=$( losetup ${dev} | awk '{print $3}' | tr -d '()' )
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snapfile=$(basename ${snaploop})
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snapdev=$(cat /proc/mounts | awk '{print $2,$1}' | grep -es "^$( dirname ${snaploop} )" | cut -f2 -d ' ')
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else
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snapdev="${dev}"
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fi
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if ! do_snap_copy "${dev}" "${snap_mount}" "${snap_type}" ; then
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log_warning_msg "Impossible to include the ${snap_label} Snapshot"
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return 1
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else
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if [ -n "${snapfile}" ]; then
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# it was a loop device, user confused
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umount ${snapdev}
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fi
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fi
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else
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log_warning_msg "Impossible to include the ${snap_label} Snapshot"
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return 1
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fi
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fi
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echo "export ${snap_type}SNAP="/cow${snap_mount#$rootmnt}":${snapdev}:${snapfile}" >> /etc/casper.conf # for resync on reboot/halt
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return 0
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}
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setup_unionfs() {
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image_directory="$1"
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rootmnt="$2"
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case ${UNIONFS} in
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aufs|unionfs)
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modprobe "${MP_QUIET}" -b ${UNIONFS} || true
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;;
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esac
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# run-init can't deal with images in a subdir, but we're going to
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# move all of these away before it runs anyway. No, we're not,
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# put them in / since move-mounting them into / breaks mono and
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# some other apps.
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croot="/"
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# Let's just mount the read-only file systems first
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rofsstring=""
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rofslist=""
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if [ "${NETBOOT}" = "nfs" ] ; then
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roopt="nfsro" # work around a bug in nfs-unionfs locking
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elif [ "${UNIONFS}" = "aufs" ]; then
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roopt="rr"
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else
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roopt="ro"
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fi
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mkdir -p "${croot}"
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for image_type in "ext2" "squashfs" "dir" ; do
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for image in "${image_directory}"/*."${image_type}"; do
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imagename=$(basename "${image}")
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if [ -d "${image}" ]; then
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# it is a plain directory: do nothing
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rofsstring="${image}=${roopt}:${rofsstring}"
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rofslist="${image} ${rofslist}"
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elif [ -f "${image}" ]; then
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backdev=$(get_backing_device "$image")
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fstype=$(get_fstype "${backdev}")
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if [ "${fstype}" = "unknown" ]; then
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panic "Unknown file system type on ${backdev} (${image})"
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fi
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mkdir -p "${croot}/${imagename}"
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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} ${rofslist}"
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fi
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done
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done
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rofsstring=${rofsstring%:}
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mkdir -p /cow
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cowdevice="tmpfs"
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cow_fstype="tmpfs"
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cow_mountopt="rw,noatime,mode=755"
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# Looking for "${root_persistence}" device or file
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if [ -n "${PERSISTENT}" ]; then
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cowprobe=$(find_cow_device "${root_persistence}")
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if [ -b "${cowprobe}" ]; then
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cowdevice=${cowprobe}
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cow_fstype=$(get_fstype "${cowprobe}")
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cow_mountopt="rw,noatime"
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else
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[ "$quiet" != "y" ] && \
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log_warning_msg "Unable to find the persistent medium"
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fi
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fi
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mount -t ${cow_fstype} -o ${cow_mountopt} ${cowdevice} \
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/cow || panic "Can not mount $cowdevice on /cow"
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mount -t ${UNIONFS} -o noatime,dirs=/cow=rw:$rofsstring \
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${UNIONFS} "$rootmnt" || panic "${UNIONFS} mount failed"
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# Adding other custom mounts
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if [ -n "${PERSISTENT}" ]; then
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# directly mount /home
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# FIXME: add a custom mounts configurable system
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homecow=$(find_cow_device "${home_persistence}" )
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if [ -b "${homecow}" ]; then
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mount -t $(get_fstype "${homecow}") -o rw,noatime \
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"${homecow}" "${rootmnt}/home"
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# Used to proper calculate free space in do_snap_copy()
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export HOMEMOUNTED=1
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else
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[ "$quiet" != "y" ] && \
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log_warning_msg "Unable to find the persistent home medium"
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fi
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# Look for other snapshots to copy in
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try_snap "${root_snapshot_label}" "${rootmnt}" "ROOT"
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try_snap "${home_snapshot_label}" "${rootmnt}/home" "HOME"
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fi
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if [ -n "${SHOWMOUNTS}" ]; then
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for d in ${rofslist}; do
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mkdir -p "${rootmnt}/${LIVE_MEDIA_PATH}/${d##*/}"
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case d in
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*.dir)
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# do nothing
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;;
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*)
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mount -o move "${d}" \
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"${rootmnt}/${LIVE_MEDIA_PATH}/${d##*/}"
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;;
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esac
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done
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# shows cow fs on /cow for use by casper-snapshot
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mkdir -p "${rootmnt}/cow"
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mount -o bind /cow "${rootmnt}/cow"
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fi
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# XXX: hardcode the image name for now (xtraeme).
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# move the first mount.
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mkdir -p "${rootmnt}/rofs"
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mount -o move /filesystem.squashfs "${rootmnt}/rofs"
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}
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check_dev ()
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{
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sysdev="${1}"
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devname="${2}"
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skip_uuid_check="${3}"
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if [ -z "${devname}" ]; then
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devname=$(sys2dev "${sysdev}")
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fi
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if [ -d "${devname}" ]; then
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mount -o bind "${devname}" $mountpoint || continue
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if is_casper_path $mountpoint; then
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echo $mountpoint
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return 0
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else
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umount $mountpoint
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fi
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fi
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if [ -n "${LIVEMEDIA_OFFSET}" ]; then
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loopdevname=$(setup_loop "${devname}" "loop" "/sys/block/loop*" "${LIVEMEDIA_OFFSET}")
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devname="${loopdevname}"
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fi
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fstype=$(get_fstype "${devname}")
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if is_supported_fs ${fstype}; then
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mount -t ${fstype} -o ro,noatime "${devname}" $mountpoint || continue
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if is_casper_path $mountpoint && \
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([ "$skip_uuid_check" ] || matches_uuid $mountpoint); then
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|
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 "${sysblock}")
|
|
fstype=$(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
|
|
[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/casper-premount"
|
|
run_scripts /scripts/casper-premount
|
|
[ "$quiet" != "y" ] && log_end_msg
|
|
|
|
if [ ! -z "${NETBOOT}" ]; then
|
|
if do_netmount ; then
|
|
livefs_root="${mountpoint}"
|
|
else
|
|
panic "Unable to find a live file system on the network"
|
|
fi
|
|
else
|
|
# Scan local devices for the image
|
|
i=0
|
|
while [ "$i" -lt 60 ]; do
|
|
livefs_root=$(find_livefs $i)
|
|
if [ "${livefs_root}" ]; then
|
|
break
|
|
fi
|
|
sleep 1
|
|
i="$(($i + 1))"
|
|
done
|
|
fi
|
|
|
|
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 [ "${live_dest}" ]; then
|
|
[ "$quiet" != "y" ] && \
|
|
log_begin_msg "Copying live_media to ${live_dest}"
|
|
copy_live_to "${livefs_root}" "${live_dest}"
|
|
[ "$quiet" != "y" ] && log_end_msg
|
|
fi
|
|
|
|
mount_images_in_directory "${livefs_root}" "${rootmnt}"
|
|
|
|
maybe_break casper-bottom
|
|
[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/casper-bottom"
|
|
run_scripts /scripts/casper-bottom
|
|
[ "$quiet" != "y" ] && log_end_msg
|
|
}
|