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Directory :  /proc/self/root/var/lib/dpkg/info/

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Current File : /proc/self/root/var/lib/dpkg/info/udev.preinst
#!/bin/sh

set -e

# adapted from postinst
chrooted() {
  if [ "$(stat -c %d/%i /)" = "$(stat -Lc %d/%i /proc/1/root 2>/dev/null)" ];
  then
    return 1
  fi
  return 0
}

check_kernel_features() {
  # skip the check if udev is not already active
  [ -d /run/udev/ ] || return 0

  if [ -e /proc/kallsyms ]; then

  local needed_symbols='inotify_init signalfd accept4 open_by_handle_at timerfd_create epoll_create'
  for symbol in $needed_symbols; do
    if ! egrep -q "^[a-fA-F0-9]+ T \.?sys_${symbol}$" /proc/kallsyms; then
      cat <<END
Since release 198, udev requires support for the following features in
the running kernel:

- inotify(2)            (CONFIG_INOTIFY_USER)
- signalfd(2)           (CONFIG_SIGNALFD)
- accept4(2)
- open_by_handle_at(2)  (CONFIG_FHANDLE)
- timerfd_create(2)     (CONFIG_TIMERFD)
- epoll_create(2)       (CONFIG_EPOLL)
END
      exit 1
    fi
  done

  fi

  if ! grep -q '[[:space:]]devtmpfs$' /proc/filesystems; then
    cat <<END
Since release 176, udev requires support for the following features in
the running kernel:

- devtmpfs         (CONFIG_DEVTMPFS)
END
    exit 1
  fi

  if [ -d /sys/class/mem/null -a ! -L /sys/class/mem/null ] ||
     [ -e /sys/block -a ! -e /sys/class/block ]; then
    cat <<END
The currently running kernel has the CONFIG_SYSFS_DEPRECATED option
enabled, which is incompatible with udev.
END
    exit 1
  fi
}

check_version() {
  # $2 is non-empty when installing from the "config-files" state
  [ -n "$2" ] || return 0

  if dpkg --compare-versions $2 lt 204-4; then
    # these must be checked first to allow aborting before changing anything
    if chrooted; then
      echo 'Running in a chroot, skipping the kernel versions checks!'
    else
      check_kernel_features
      # suppress errors when the new rules files contain options not supported by
      # the old daemon
      udevadm control --log-priority=0 || true
    fi
  fi # 204-4
}

case "$1" in
    install|upgrade|abort-upgrade)
    check_version "$@"
    ;;
esac

# Automatically added by dh_installdeb/12.10ubuntu1
dpkg-maintscript-helper rm_conffile /etc/init/udev.conf 233-1\~ -- "$@"
dpkg-maintscript-helper rm_conffile /etc/init/udevmonitor.conf 233-1\~ -- "$@"
dpkg-maintscript-helper rm_conffile /etc/init/udevtrigger.conf 233-1\~ -- "$@"
# End automatically added section

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