#!/bin/sh

. /etc/sysconfig/prelink

renice +19 -p $$ >/dev/null 2>&1

if [ "$PRELINKING" != yes ]; then
  if [ -f /etc/prelink.cache ]; then
    echo /usr/sbin/prelink -uav > /var/log/prelink.log
    /usr/sbin/prelink -uav >> /var/log/prelink.log 2>&1 \
      || echo Prelink failed with return value $? >> /var/log/prelink.log
    rm -f /etc/prelink.cache
    # Restart init if needed
    [ -n "$(find `ldd /sbin/init | awk 'NF == 4 { print $3 }'` /sbin/init -ctime -1 2>/dev/null )" ] && /sbin/telinit u
  fi
  exit 0
fi

if [ ! -f /etc/prelink.cache -o -f /var/lib/misc/prelink.force ] \
   || grep -q '^prelink-ELF0.[0-2]' /etc/prelink.cache; then
  # If cache does not exist or is from older prelink versions or
  # if we were asked to explicitely, force full prelinking
  rm -f /etc/prelink.cache /var/lib/misc/prelink.force
  PRELINK_OPTS="$PRELINK_OPTS -f"
  date > /var/lib/misc/prelink.full
  cp -a /var/lib/misc/prelink.{full,quick}
elif [ -n "$PRELINK_FULL_TIME_INTERVAL" \
       -a "`find /var/lib/misc/prelink.full -mtime -${PRELINK_FULL_TIME_INTERVAL} 2>/dev/null`" \
	  = /var/lib/misc/prelink.full ]; then
  # If no more than PRELINK_NONRPM_CHECK_INTERVAL days elapsed from last prelink
  # (be it full or quick) and no packages have been upgraded via rpm since then,
  # don't do anything.
  [ "`find /var/lib/misc/prelink.quick -mtime -${PRELINK_NONRPM_CHECK_INTERVAL:-7} 2>/dev/null`" \
    -a -f /var/lib/rpm/Packages \
    -a /var/lib/rpm/Packages -ot /var/lib/misc/prelink.quick ] && exit 0
  date > /var/lib/misc/prelink.quick
  # If prelink without -q has been run in the last
  # PRELINK_FULL_TIME_INTERVAL days, just use quick mode
  PRELINK_OPTS="$PRELINK_OPTS -q"
else
  date > /var/lib/misc/prelink.full
  cp -a /var/lib/misc/prelink.{full,quick}
fi

echo /usr/sbin/prelink -av $PRELINK_OPTS > /var/log/prelink.log
/usr/sbin/prelink -av $PRELINK_OPTS >> /var/log/prelink.log 2>&1 \
  || echo Prelink failed with return value $? >> /var/log/prelink.log
# Restart init if needed
[ -n "$(find `ldd /sbin/init | awk 'NF == 4 { print $3 }'` /sbin/init -ctime -1 2>/dev/null )" ] && /sbin/telinit u

exit 0
