scripts/boot/persistence-excludes.sh

   1 #!/bin/sh
   2
   3 #set -e
   4
   5 persistence_exclude ()
   6 {
   7         # Persistence enhancer script
   8         # This script saves precious time on slow persistence devices/image files
   9         # and writes on flash based device.
  10         # a tmpfs on $PERSTMP is mounted and directories listed in
  11         # /etc/live-persistence.binds will be copied there and then bind mounted back.
  12
  13         if [ -z "${PERSISTENCE}" ] || [ -n "${NOPERSISTENCE}" ] || [ -z "${PERSISTENCE_IS_ON}" ] || [ ! -f /root/etc/live-persistence.binds ]
  14         then
  15                 return
  16         fi
  17
  18         # FIXME: stop hardcoding overloading of initramfs-tools functions
  19         . /scripts/functions
  20         . /lib/live/boot/initramfs-tools.sh
  21
  22         dirs="$(sed -e '/^ *$/d' -e '/^#.*$/d' /root/etc/live-persistence.binds | tr '\n' '\0')"
  23         if [ -z "${dirs}" ]
  24         then
  25                 return
  26         fi
  27
  28         log_begin_msg "Moving persistence bind mounts"
  29
  30         PERSTMP="/root/live/persistence-binds"
  31         CPIO="/bin/cpio"
  32
  33         if [ ! -d "${PERSTMP}" ]
  34         then
  35                 mkdir -p "${PERSTMP}"
  36         fi
  37
  38         mount -t tmpfs tmpfs "${PERSTMP}"
  39
  40         for dir in $(echo "${dirs}" | tr '\0' '\n')
  41         do
  42                 if [ ! -e "/root/${dir}" ] && [ ! -L "/root/${dir}" ]
  43                 then
  44                         # directory do not exists, create it
  45                         mkdir -p "/root/${dir}"
  46                 elif [ ! -d "/root/${dir}" ]
  47                 then
  48                         # it is not a directory, skip it
  49                         break
  50                 fi
  51
  52                 # Copy previous content if any
  53                 cd "/root/${dir}"
  54                 find . -print0 | ${CPIO} -pumd0 "${PERSTMP}/${dir}"
  55                 cd "${OLDPWD}"
  56
  57                 # Bind mount it to origin
  58                 mount -o bind "${PERSTMP}/${dir}" "/root/${dir}"
  59         done
  60
  61         log_end_msg
  62 }