Drop classic scripts used for kernel module building

scripts/classic

-#!/bin/sh
-
-set -e
-
-ROOT=$SNAP_COMMON/classic
-
-# $1: source
-# $2: target
-# $3: if not empty, bind mount will be read-only
-# note that we do NOT clean these up at the end, as the user might start many
-# classic shells in parallel; we could start all of them in their own mount
-# namespace, but that would make the classic shell less useful for
-# developing/debugging the snappy host
-do_bindmount() {
-    if ! mountpoint -q "$ROOT/$2"; then
-        if [ -d "$1" -a ! -L "$1" ]; then
-            mkdir -p "$ROOT/$2"
-        fi
-        mount --make-rprivate --rbind -o rbind "$1" "$ROOT/$2"
-        if [ -n "${3:-}" ]; then
-            mount --rbind -o remount,ro "$1" "$ROOT/$2"
-        fi
-    fi
-}
-
-if [ "$(id -u)" != "0" ]; then
-    echo "needs to run as root"
-    exit 1
-fi
-
-if [ ! -d $ROOT ]; then
-    # IMPORTANT: do not run the classic.create as this will run it with
-    #            snap-confine again and this will cause havoc with current
-    #            snap-confine
-    $SNAP/bin/create
-fi
-
-# FIXME: confinement will prevent this
-do_bindmount /home /home
-do_bindmount /run /run
-do_bindmount /proc /proc
-do_bindmount /sys /sys
-do_bindmount /dev /dev
-do_bindmount / /snappy
-
-SUDO_USER=root
-
-# fix LP: #1619455
-cp -a /var/lib/extrausers/* $ROOT/var/lib/extrausers/
-cp -a /etc/sudoers.d/* $ROOT/etc/sudoers.d/
-
-# assemble command line
-DEVPTS="mount -o mode=666,ptmxmode=666 -t devpts devpts /dev/pts"
-SUDOCMD="sudo debian_chroot=classic -u ${SUDO_USER} -i $@"
-# FIXME: workaround for https://bugs.launchpad.net/snappy/+bug/1611493
-SCRIPT="script --quiet --return --command \"$SUDOCMD\" /dev/null"
-
-CMD="$DEVPTS; $SCRIPT"
-
-systemd-run --quiet --scope --unit=classic-$$.scope --description="Classic shell" chroot "$ROOT" sh -c "$CMD"
-
-# kill leftover processes after exiting, if it's still around
-systemctl stop classic-$$.scope 2>/dev/null || true

scripts/classic-create

-#!/bin/sh
-
-set -eu
-
-ROOT=$SNAP_COMMON/classic
-
-if [ -d $ROOT ]; then
-    echo "classic already enabled"
-    exit 1
-fi
-
-if [ $(id -u) -ne 0 ]; then
-    echo "This script needs to be called as root" >&2
-    exit 1
-fi
-
-CORE=""
-if [ -e /snap/core/current ]; then
-    CORE="core"
-elif [ -e /snap/ubuntu-core/current ]; then
-    CORE="ubuntu-core"
-else
-    echo "Cannot find core snap"
-    exit 1
-fi
-
-# FIXME: confinement will prevent this
-echo "Creating classic environment"
-VERSION="$(/bin/readlink /snap/${CORE}/current)"
-SNAPROOT="/var/lib/snapd/snaps/${CORE}_${VERSION}.snap"
-/usr/bin/unsquashfs -d $ROOT $SNAPROOT
-mkdir $ROOT/snappy
-
-# enable
-sudo chroot $ROOT /var/lib/classic/enable.sh
-
-# copy important config
-for f in hostname timezone localtime; do
-    cp -a /etc/writable/$f $ROOT/etc/writable
-done
-for f in hosts; do
-    cp -a /etc/$f $ROOT/etc/
-done
-
-
-# don't start services in the chroot on apt-get install
-cat <<EOF > "$ROOT/usr/sbin/policy-rc.d"
-#!/bin/sh
-while true; do
-    case "\$1" in
-      -*) shift ;;
-      makedev) exit 0;;
-      x11-common) exit 0;;
-      *) exit 101;;
-    esac
-done
-EOF
-chmod 755 "$ROOT/usr/sbin/policy-rc.d"
-
-# workaround bug in livecd-rootfs
-chmod 1777 "$ROOT/tmp"

scripts/classic-reset

-#!/bin/sh
-
-set -eu
-
-ROOT=$SNAP_COMMON/classic
-
-if [ "$(id -u)" != "0" ]; then
-    echo "needs to run as root"
-    exit 1
-fi
-
-for d in /home /run /proc /sys /dev /var/lib/extrausers /etc/sudoers /etc/sudoers.d /snappy; do
-  if mountpoint -q "$ROOT/$d"; then
-    umount "$ROOT/$d"
-  fi
-done
-
-# cleanup
-rm -rf $ROOT

snapcraft.yaml

@@ -29,16 +29,10 @@ parts:
       scripts/snap-wrapper.sh: bin/anbox-wrapper.sh
       scripts/container-manager.sh: bin/container-manager.sh
       scripts/anbox-bridge.sh: bin/anbox-bridge.sh
-      scripts/classic: bin/classic
-      scripts/classic-create: bin/classic-create
-      scripts/classic-reset: bin/classic-reset
     snap:
       - bin/anbox-bridge.sh
       - bin/anbox-wrapper.sh
       - bin/container-manager.sh
-      - bin/classic
-      - bin/classic-create
-      - bin/classic-reset
   apparmor:
     plugin: nil
     stage-packages: