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#!/usr/bin/bash
run_hook() {
. /etc/docker-btrfs.sh
docker_rwlayer=$(echo $rootflags | grep -o "subvol=[^,]*" | grep -o "[^=]*\$")
mkdir -p /docker_root
mkdir -p /var/lib/docker
mkdir -p /top_layer
msg ":: mounting "$root" at /docker_root"
rootdev=$(resolve_device "$root") && root=$rootdev
unset rootdev
if ! mount -t btrfs "$root" "/docker_root"; then
echo "You are now being dropped into an emergency shell."
launch_interactive_shell
msg "Trying to continue (this will most likely fail) ..."
fi
msg ":: bind mounting "/docker_root/$docker_path" at /var/lib/docker"
if ! mount -o bind "/docker_root/$docker_path" "/var/lib/docker"; then
echo "You are now being dropped into an emergency shell."
launch_interactive_shell
msg "Trying to continue (this will most likely fail) ..."
fi
msg ":: getting docker cache subvolume"
cd /var/lib/docker/image/btrfs
image_id=$(jq ".Repositories.\"$docker_image\".\"$docker_image:$docker_tag\"" repositories.json | sed 's/:/\//g;s/"//g')
last_layer_id=$(jq '.rootfs.diff_ids[]' imagedb/content/$image_id | sed 's/"//g' | tail -n 1)
cache_id_file=$(grep $last_layer_id -rl layerdb | sed 's/diff/cache-id/g')
cache_id=$(cat $cache_id_file)
msg ":: creating rwlayer"
[ -d /docker_root/"$docker_rwlayer" ] && btrfs subvolume delete /docker_root/"$docker_rwlayer"
if ! btrfs subvolume snapshot /var/lib/docker/btrfs/subvolumes/$cache_id /docker_root/"$docker_rwlayer"; then
echo "You are now being dropped into an emergency shell."
launch_interactive_shell
msg "Trying to continue (this will most likely fail) ..."
fi
msg ":: mounting top layer drive"
toplayerdev=$(resolve_device "$toplayer") && root=$toplayerdev
unset toplayerdev
if ! mount ${toplayerfstype:+-t $toplayerfstype} ${toplayerflags:+-o $toplayerflags} "$toplayer" "/top_layer"; then
echo "You are now being dropped into an emergency shell."
launch_interactive_shell
msg "Trying to continue (this will most likely fail) ..."
fi
msg ":: applying top layer"
cp -r /top_layer/"$toplayer_path"/* /docker_root/"$docker_rwlayer"/
# cleaning
cd /
umount /top_layer
umount /var/lib/docker
umount /docker_root
}
# vim: set ft=sh ts=4 sw=4 et:
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