livecd-rootfs/live-build/ubuntu-server/hooks/032-installer-squashfs.binary

#!/bin/bash -ex
# vi: ts=4 noexpandtab
#
# Generate a squashfs root and manifest

set -x

echo "032-installer-squashfs.binary"

case $IMAGE_TARGETS in
	""|*squashfs*)
		;;
	*)
		echo "Skipping squashfs build"
		exit 0
		;;
esac

if [ -n "$SUBARCH" ]; then
	echo "Skipping rootfs build for subarch flavor build"
	exit 0
fi

. config/functions

SQUASH_ROOT=binary/boot/squashfs.dir
OVERLAY_ROOT=binary/overlay

mkdir -p "$OVERLAY_ROOT"

# Create an installer squashfs layer
mount_overlay "$SQUASH_ROOT/" "$OVERLAY_ROOT/" "$SQUASH_ROOT/"

setup_mountpoint binary/boot/squashfs.dir

# Prepare installer layer.

# Install any requirements for the installer, for things we don't want
# to see on the installed system
chroot $SQUASH_ROOT apt-get update
chroot $SQUASH_ROOT apt-get -y install user-setup
chroot $SQUASH_ROOT apt-get -y install curtin

# Don't let cloud-init run in the live session.
touch $SQUASH_ROOT/etc/cloud/cloud-init.disabled

# Do the snap seeding dance.
chroot $SQUASH_ROOT mkdir -p /var/lib/snapd/seed/snaps /var/lib/snapd/seed/assertions
chroot $SQUASH_ROOT sh -c '
set -x;
cd /var/lib/snapd/seed;
sudo SNAPPY_STORE_NO_CDN=1 snap download core;
sudo SNAPPY_STORE_NO_CDN=1 snap download subiquity;

CORE_SNAP=$(ls -1 core*.snap);
SUBIQUITY_SNAP=$(ls -1 subiquity*.snap);

mv *.assert /var/lib/snapd/seed/assertions/;
mv *.snap /var/lib/snapd/seed/snaps/;

cat <<EOF > /var/lib/snapd/seed/seed.yaml
snaps:
 - name: core
   channel: stable
   file: ${CORE_SNAP}
 - name: subiquity
   channel: stable
   classic: true
   file: ${SUBIQUITY_SNAP}
EOF
'

teardown_mountpoint "$SQUASH_ROOT"

# Then unmount the overlay
umount "$SQUASH_ROOT"

squashfs_f="${PWD}/livecd.${PROJECT}.installer.squashfs"

(cd "$OVERLAY_ROOT/" &&
      mksquashfs . ${squashfs_f} \
        -no-progress -xattrs -comp xz )