scripts/live-bottom/08persistence_excludes

   1 #!/bin/sh
   2
   3 # Persistence enhancer script
   4 # This script saves precious time on slow persistence devices/image files
   5 # and writes on flash based device.
   6 # a tmpfs on $PERSTMP is mounted and directories listed in
   7 # /etc/live-persistence.binds will be copied there and then bind mounted back.
   8
   9 #set -e
  10
  11 # initramfs-tools header
  12
  13 PREREQ=""
  14
  15 prereqs()
  16 {
  17         echo "${PREREQ}"
  18 }
  19
  20 case "${1}" in
  21         prereqs)
  22                 prereqs
  23                 exit 0
  24                 ;;
  25 esac
  26
  27 # live-boot header
  28
  29 if [ -z "${PERSISTENCE}" ] || [ -n "${NOPERSISTENCE}" ] || [ -z "${PERSISTENCE_IS_ON}" ] || [ ! -f /root/etc/live-persistence.binds ]
  30 then
  31         exit 0
  32 fi
  33
  34 . /scripts/live-functions
  35
  36 # live-boot script
  37
  38 dirs="$(sed -e '/^ *$/d' -e '/^#.*$/d' /root/etc/live-persistence.binds | tr '\n' '\0')"
  39 if [ -z "${dirs}" ]
  40 then
  41         exit 0
  42 fi
  43
  44 log_begin_msg "Moving persistence bind mounts"
  45
  46 PERSTMP="/root/live/persistence-binds"
  47 CPIO="/bin/cpio"
  48
  49 if [ ! -d "${PERSTMP}" ]
  50 then
  51         mkdir -p "${PERSTMP}"
  52 fi
  53
  54 mount -t tmpfs tmpfs "${PERSTMP}"
  55
  56 for dir in $(echo "${dirs}" | tr '\0' '\n')
  57 do
  58         if [ ! -e "/root/${dir}" ] && [ ! -L "/root/${dir}" ]
  59         then
  60                 # directory do not exists, create it
  61                 mkdir -p "/root/${dir}"
  62         elif [ ! -d "/root/${dir}" ]
  63         then
  64                 # it is not a directory, skip it
  65                 break
  66         fi
  67
  68         # Copy previous content if any
  69         cd "/root/${dir}"
  70         find . -print0 | ${CPIO} -pumd0 "${PERSTMP}/${dir}"
  71         cd "${OLDPWD}"
  72
  73         # Bind mount it to origin
  74         mount -o bind "${PERSTMP}/${dir}" "/root/${dir}"
  75 done
  76
  77 log_end_msg