/usr/share/initramfs-tools/scripts/casper-helpers is in casper 1.315.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 | ## Casper helper functions, used by casper on boot and by casper-snapshot
if [ "${BUILD_SYSTEM}" = "Debian" ] || [ "${BUILD_SYSTEM}" = "Ubuntu" ]; then
MP_QUIET="-q"
else
MP_QUIET=""
fi
if [ ! -x "/bin/fstype" ]; then
# klibc not in path -> not in initramfs
export PATH="${PATH}:/usr/lib/klibc/bin"
fi
sys2dev() {
sysdev=${1#/sys}
echo "/dev/$(/sbin/udevadm info -q name -p ${sysdev} 2>/dev/null|| echo ${sysdev##*/})"
}
subdevices() {
sysblock=$1
r=""
for dev in "${sysblock}" "${sysblock}"/*; do
if [ -e "${dev}/dev" ]; then
r="${r} ${dev}"
fi
done
echo ${r}
}
is_supported_fs () {
# FIXME: do something better like the scan of supported filesystems
fstype="${1}"
case ${fstype} in
vfat|iso9660|udf|ext2|ext3|ext4|btrfs|ntfs)
return 0
;;
esac
return 1
}
get_fstype() {
local FSTYPE
local FSSIZE
eval $(fstype < $1)
if [ "$FSTYPE" != "unknown" ]; then
echo $FSTYPE
return 0
fi
/sbin/blkid -s TYPE -o value $1 2>/dev/null
}
where_is_mounted() {
device=$1
if grep -q "^$device " /proc/mounts; then
mountpoint="$(grep "^$device " /proc/mounts | awk '{print $2; exit}')"
grep "^$device " /proc/mounts | read d mountpoint rest
echo $mountpoint
return 0
fi
return 1
}
lastline() {
while read lines ; do
line=${lines}
done
echo "${line}"
}
base_path ()
{
testpath="${1}"
mounts="$(awk '{print $2}' /proc/mounts)"
testpath="$(busybox realpath ${testpath})"
while true ; do
if echo "${mounts}" | grep -qs "^${testpath}" ; then
set -- `echo "${mounts}" | grep "^${testpath}" | lastline`
echo ${1}
break
else
testpath=`dirname $testpath`
fi
done
}
fs_size ()
{
# Returns used/free fs kbytes + 5% more
# You could pass a block device as $1 or the mount point as $2
dev="${1}"
mountp="${2}"
used="${3}"
if [ -z "${mountp}" ]; then
mountp=$(where_is_mounted "${dev}")
if [ "$?" -gt 0 ]; then
mountp="/mnt/tmp_fs_size"
mkdir -p "${mountp}"
mount -t $(get_fstype "${dev}") -o ro "${dev}" "${mountp}"
doumount=1
fi
fi
if [ "${used}" = "used" ]; then
size=$(du -ks ${mountp} | cut -f1)
size=$(expr ${size} + ${size} / 20 ) # FIXME: 5% more to be sure
else
# free space
size="$(df -k | grep -s ${mountp} | awk '{print $4}')"
fi
if [ -n "${doumount}" ]; then
umount "${mountp}"
rmdir "${mountp}"
fi
echo "${size}"
}
setup_loop() {
local fspath=$1
local module=$2
local pattern=$3
local offset=$4
modprobe ${MP_QUIET} -b "$module"
/sbin/udevadm settle
if [ "$module" = loop ]; then
if [ ! -e /dev/loop0 ]; then
# temporary workaround for kernel bug
for i in 0 1 2 3 4 5 6 7; do
mknod "/dev/loop$i" b 7 "$i" || true
done
fi
dev="$(losetup -f)"
if [ "$dev" ]; then
if [ -n "$offset" ]; then
losetup -o "$offset" "$dev" "$fspath"
else
losetup "$dev" "$fspath"
fi
echo "$dev"
return 0
else
panic "No loop devices available"
fi
else
for loopdev in $pattern; do
if [ "$(cat $loopdev/size)" -eq 0 ]; then
dev=$(sys2dev "${loopdev}")
if [ -n "$offset" ]; then
losetup -o "$offset" "$dev" "$fspath"
else
losetup "$dev" "$fspath"
fi
echo "$dev"
return 0
fi
done
panic "No loop devices available"
fi
}
# Returns 0 on success
# panics if remount- or bind-mount fails
# returns 1 on failure otherwise
try_mount ()
{
dev="${1}"
mountp="${2}"
opts="${3}"
if where_is_mounted ${dev} > /dev/null; then
if [ "${opts}" != "ro" ]; then
mount -o remount,"${opts}" ${dev} $(where_is_mounted ${dev}) || panic "Remounting failed"
return 0
fi
mount -o bind $(where_is_mounted ${dev}) ${mountp} || panic "Cannot bind-mount"
return 0
else
mount -t $(get_fstype "${dev}") -o "${opts}" "${dev}" "${mountp}"
ret=$?
if [ $ret -ne 0 ]; then
log_warning_msg "Cannot mount ${dev} on ${mountp}"
return 1
fi
return 0
fi
}
find_cow_device() {
pers_label="${1}"
cow_backing="/${pers_label}-backing"
if [ -z "${PERSISTENT_PATH}" ]; then
pers_fpath=${pers_label}
else
pers_fpath=${PERSISTENT_PATH}/${pers_label}
fi
for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop); do
# do not ever probe floppies, probing nonexistant ones delays the boot to half an hour and longer
n=${sysblock##*/}
if [ "${n#fd}" != "$n" ]; then
continue
fi
for dev in $(subdevices "${sysblock}"); do
devname=$(sys2dev "${dev}")
if [ "$(/sbin/blkid -s LABEL -o value $devname 2>/dev/null)" = "${pers_label}" ]; then
echo "$devname"
return
# Do not add any filesystem types here that might be able to
# mount a journalled filesystem and replay the journal. Doing so
# will cause data loss when a live CD is booted on a system
# where filesystems are in use by hibernated operating systems.
elif [ "$(get_fstype ${devname})" = "vfat" ]; then
mkdir -p "${cow_backing}"
try_mount "${devname}" "${cow_backing}" "rw" || continue
cow_backing_mp=$(where_is_mounted "${devname}")
if [ -e "${cow_backing_mp}/${pers_fpath}" ]; then
echo $(setup_loop "${cow_backing_mp}/${pers_fpath}" "loop" "/sys/block/loop*")
return 0
else
umount ${cow_backing_mp}
fi
fi
done
done
}
find_files()
# return the first of $filenames found on vfat and ext2 devices
# FIXME: merge with above function
{
filenames="${1}"
snap_backing="/snap-backing"
for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop); do
for dev in $(subdevices "${sysblock}"); do
devname=$(sys2dev "${dev}")
devfstype="$(get_fstype ${devname})"
if [ "${devfstype}" = "vfat" ] || [ "${devfstype}" = "ext2" ] ; then # FIXME: all supported block devices should be scanned
mkdir -p "${snap_backing}"
try_mount "${devname}" "${snap_backing}" "ro" || continue
for filename in ${filenames}; do
if [ -e "${snap_backing}/${filename}" ]; then
echo "${devname} ${snap_backing} ${filename}"
return 0
fi
done
umount ${snap_backing}
fi
done
done
}
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