debian/preinst

   1 #! /bin/sh
   2
   3 # dpkg does this for us while we are upgrading..
   4 #if [ "$1" = "upgrade" -a -L /var/state/apt -a -e /var/lib/apt -a ! -L /var/state/apt ] && dpkg --compare-versions "$2" ">=" "0.4.10"; then
   5 #  rm /var/state/apt
   6 #fi
   7
   8 if [ "$1" = "upgrade" -o "$1" = "install" -a "$2" != "" ]; then
   9   if [ ! -e /var/lib/apt -a -e /var/state/apt ]; then
  10     # upgrading from /var/state/apt using apt.
  11     # it's probably running now so we want to ensure /var/state/apt
  12     # is still valid afterwards. and since we're upgrading
  13
  14     if [ -x /usr/bin/perl -a -d /var/state/apt -a ! -L /var/state/apt ] &&
  15       perl -e 'exit 1 if ((stat("/var/lib"))[0] != (stat("/var/state/apt"))[0])'
  16     then
  17       # same fs, we can mv it
  18       mv /var/state/apt /var/lib/apt
  19       ln -s ../lib/apt /var/state/apt
  20       # note that this symlink (/var/state/apt) will be removed when
  21       # dpkg finishes unpacking the apt we're about to install; this is okay
  22     else
  23       # scary, let's just symlink it and hope
  24       ln -s /var/state/apt /var/lib/apt
  25     fi
  26   fi
  27   touch /var/lib/apt/lists/partial/.delete-me-later || true
  28 fi