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# arg 1:  the new package version
# arg 2:  the old package version

post_upgrade() {
  if [ "$(vercmp $2 181-3)" -lt 0 ]; then
    echo "udev changes:"
    if [ "$(vercmp $2 168)" -lt 0 ]; then
      echo " * Kernel 2.6.32 or newer is now required."
      echo " * OSS emulation modules are not loaded by default, add to rc.conf if needed."
      echo " * Arch specific cd symlinks are now no longer created."
      echo " * cd and net persistent rules will no longer be autogenerated,"
      echo "   see <https://wiki.archlinux.org/index.php/Udev> for details."
      echo " * Errors are now logged (possibly to the console) by default."
    fi
    if [ "$(vercmp $2 171)" -lt 0 ]; then
      echo " * Arch's custom blacklisting logic has been removed. MOD_AUTOLOAD and"
      echo "   blacklisting in MODULES no longer works."
      echo "   See 'man modprobe.conf' for a replacement to blacklisting."
      echo "   To disable a module mod1 on the kernel command line, use"
      echo "     mod1.disable=1"
      echo "   or"
      echo "     modprobe.blacklist=mod1"
      echo " * The following modules are no longer unconditionally loaded:"
      echo "     pcspkr irtty-sir analog lp ppdev ide-generic"
      echo "   Add them to MODULES in rc.conf if you need them."
    fi
    if [ "$(vercmp $2 172)" -lt 0 ]; then
      echo " * Blacklisting of framebuffer devices has moved from /etc/modprobe.d to"
      echo "   /lib/modprobe.d. Any customizations shoud be done to the file in /etc, as it"
      echo "   takes precedence."
      echo " * kbd and rtc devices are no longer world readable."
      echo " * rtc is no longer in the audio group and fb devices are no longer in"
      echo "   the video group, as permissions and ownership of fb devices are controlled"
      echo "   by X."
    fi
    if [ "$(vercmp $2 174)" -lt 0 ]; then
      echo " * We now use upstream rules for assigning devices to the 'disk', 'optical',"
      echo "   'scanner' and 'video' groups. Beware of any changes."
      echo " * We no longer create symlinks from /dev/<dev> to /dev/<dev>0."
      echo " * For security reasons, we no longer add devices to the 'storage' group. Use"
      echo "   udisks and friends, or add custom rules to /etc/udev.d/rules/, if you want"
      echo "   this functionality back."
      echo " * We no longer create the static nodes on install needed for an initrd-less"
      echo "   boot where devtmpfs is not mounted by the kernel, this only affects fresh"
      echo "   installs."
    fi
    if [ "$(vercmp $2 175)" -lt 0 ]; then
      echo " * devtmpfs support is now a hard requirement. Users of the official Arch"
      echo "   kernels have this enabled."
    fi
    if [ "$(vercmp $2 181)" -lt 0 ]; then
      echo " * udev-compat has been removed, and should be uninstalled."
      echo " * Framebuffers are no longer blacklisted by default."
      echo " * binaries moved from /sbin to /usr/bin"
    fi
    echo " * if your kernel does not provide /dev/loop-control, you need to manually"
    echo "   load the 'loop' module before using losetup"
  fi
}