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

# call the enable.sh script and make sure we have
# DNS resolution available (needed by apt update)
mkdir -p $ROOT/run/resolvconf
cp /run/resolvconf/resolv.conf $ROOT/run/resolvconf/
sudo chroot $ROOT /var/lib/classic/enable.sh
rm -rf $ROOT/run/resolvconf

# 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"