config/chroot_local-includes/lib/live/config/0000-readahead

   1 #!/bin/sh
   2
   3 READAHEAD_LIST="/usr/share/tails/readahead-list"
   4 BACKGROUND_AT="^usr/bin/Xorg$"
   5
   6 Readahead ()
   7 {
   8
   9         # Do not readahead when "profile" appears on kernel command line
  10         if grep -qw "profile" /proc/cmdline
  11         then
  12                 return 0
  13         fi
  14
  15         if ! test -e "$READAHEAD_LIST"
  16         then
  17                 echo "the readahead list (${READAHEAD}) does not exist."
  18                 return
  19         fi
  20
  21         echo " readahead"
  22         Start_readahead
  23 }
  24
  25 Start_readahead ()
  26 {
  27         FG_FILES="sed -n -e \\:$BACKGROUND_AT:q;p $READAHEAD_LIST"
  28         BG_FILES="sed -n -e \\:$BACKGROUND_AT:,\$p $READAHEAD_LIST"
  29         FG_SIZE=$(
  30          cd /
  31          $FG_FILES |
  32          xargs du -bc 2>/dev/null |
  33          awk '$2 ~ /^total$/ { t = t + $1 } END { print t }')
  34         (cd /
  35          $BG_FILES |
  36          xargs stat >/dev/null 2>/dev/null || :)
  37         (cd /
  38          $FG_FILES |
  39          xargs cat 2>/dev/null |
  40          pv -f -s ${FG_SIZE} >/dev/null || :)
  41         (cd /
  42          start-stop-daemon \
  43                 --start --background --make-pidfile --startas /bin/sh \
  44                 --pidfile /run/background-readahead.pid -- \
  45                 -c "$BG_FILES | xargs cat >/dev/null 2>&1")
  46
  47         # Creating state file
  48         touch /var/lib/live/config/readahead
  49 }
  50
  51 Readahead