livecd-rootfs/live-build/ubuntu-core/hooks/500-move-kernel-to-device-tar.binary

#!/bin/sh
#
# move the kernel out into a new device tarfile with system/boot 

set -ex

echo "I: Moving kernel into device tarball"

HERE="$(pwd)"
TMPDIR="$(mktemp -d)"
ARCH=$(dpkg --print-architecture)
mkdir -p $TMPDIR/system/
mkdir -p $TMPDIR/assets/

# cp files, we can't simply use tar --transform as it changes the symlink target
(
 cd binary/boot/filesystem.dir 

 # for compatibility with current grub/u-d-f
 cp -ar --parent boot/vmlinu?-* boot/initrd.img-* boot/abi-* boot/System.map-* $TMPDIR/system/
 if [ -e vmlinu? ] && [ -e initrd.img ]; then
     cp -ar --parent vmlinu? initrd.img $TMPDIR/system
 fi
 cp -ar --parent lib/modules/ $TMPDIR/system/
 cp -ar --parent lib/firmware/ $TMPDIR/system/

 # new assets handling
 cp -ar boot/vmlinu?-* $TMPDIR/assets/vmlinuz
 cp -ar boot/initrd.img-* $TMPDIR/assets/initrd.img
 cp -ar boot/vmlinu?-* boot/initrd.img-* boot/abi-* boot/System.map-* $TMPDIR/assets/

 dtbs=$(find lib/firmware -type d -name 'device-tree' -print0)
 [ -n "$dtbs" ] && mv "$dtbs" $TMPDIR/assets/dtbs

 if [ -e vmlinu? ] && [ -e initrd.img ]; then
     cp -ar --parent vmlinu? initrd.img $TMPDIR/assets
     cp -ar --parent vmlinu? initrd.img $TMPDIR/assets
 fi
)
# create hardware.yaml for u-boot
# this assumes armh == u-boot
# and all others grub
(
# common bits
 cat > $TMPDIR/hardware.yaml << EOF
kernel: assets/vmlinuz
initrd: assets/initrd.img
partiton-layout: system-AB
EOF

# arch specific ones
if [ "$ARCH" = "armhf" ]; then
 cat >> $TMPDIR/hardware.yaml << EOF
dtbs: assets/dtbs
bootloader: u-boot
EOF
else
 cat >> $TMPDIR/hardware.yaml << EOF
bootloader: grub
EOF
fi
)

# and tar it up
(
 cd $TMPDIR
 tar -c -z -f $HERE/device.tar.gz system assets hardware.yaml
)

# now build the azure device tarball by adding walinuxagent
if [ -e binary/boot/filesystem.dir/var/lib/dpkg/info/walinuxagent.list ];
then
(
 cd binary/boot/filesystem.dir 
 while read line; do
     line=$(echo $line |cut -d/ -f2-)
     if [ -e "$line" ] && [ ! -d "$line" ]; then
         cp -ar --parent $line $TMPDIR/system
     fi
 done < var/lib/dpkg/info/walinuxagent.list
 # created by walinuxagent postinst/dh-systemd
 cp -ar --parent var/lib/systemd/deb-systemd-helper-enabled/walinuxagent* $TMPDIR/system
 cp -ar --parent etc/systemd/system/multi-user.target.wants/walinuxagent* $TMPDIR/system
 mkdir -p $TMPDIR/system/var/lib/waagent
)
# and tar it up
(
 cd $TMPDIR
 tar -c -z -f $HERE/device-azure.tar.gz system assets hardware.yaml
)
fi
rm -rf $TMPDIR

# remove files from the root filesystem
(cd binary/boot/filesystem.dir
 rm -f boot/vmlinu?-*
 rm -f boot/initrd.img-*
 rm -f boot/abi-*
 rm -f boot/System.map-*
 rm -f initrd.img
 rm -f vmlinu?
 rm -rf lib/modules
 rm -rf lib/firmware
 # remove walinuxagent
 if [ -e var/lib/dpkg/info/walinuxagent.list ]; then
     chroot . dpkg --purge walinuxagent || true
 fi
)