#!/usr/bin/env bash

# $1	The path to ensure is mounted after a network interface comes up.
ensure_nfs() {
	local dirpath="${1}";
	local target_script="/etc/network/if-up.d/ensure-nfs";
	#/etc/network/if-up.d/
	
	task_begin "ensure_nfs: registering ${dirpath}";
	# 1: Ensure the target script exists
	if [[ ! -d "$(dirname "${target_script}")" ]]; then
		mkdir -p "$(dirname "${target_script}")";
	fi
	if [[ ! -r "${target_script}" ]]; then
		echo "#!/usr/bin/env bash" >>"${target_script}";
		chmod +x "${target_script}";
	fi
	
	if grep -q "${dirpath}; then" "${target_script}"; then
		echo "ensure_nfs: ${dirpath} is already registered.";
		task_end 0;
		return 0;
	fi
	
	echo "if ! mountpoint -q '${dirpath}'; then mount '${dirpath}'; fi" >>"${target_script}";
	
	task_end "$?" "ensure_nfs: error registering ${dirpath} in ${target_script}";
}

# $1	Thing to mount
# $2	Path to mount it to
add_nfs_mount() {
	local source="${1}";
	local target="${2}";
	
	task_begin "NFS mount ${source} → ${target}";
	# 1: Remove any old entries from /etc/fstab
	sed -i "/^$(echo "${source}" | awk '{gsub("/", "\\/", $0); print($0); }')\s/d" /etc/fstab
	
	# 2: Append the new entry
	echo "${source}	${target}	nfs	auto,nofail,noatime,_netdev,tcp,bg,timeo=50,retrans=5	0	0" >>/etc/fstab;
	
	# 3: Create the target mount point & mount
	mkdir -p "${target}";
	mount "${target}";
	
	task_end "$?";
	
	ensure_nfs "${target}";
}

add_nfs_mount "magicbag.node.mooncarrot.space:/mnt/elfstone2/cluster" "/mnt/shared";
add_nfs_mount "magicbag.node.mooncarrot.space:/mnt/elfstone2/main	/mnt/elfstone" "/mnt/elfstone";
add_nfs_mount "magicbag.node.mooncarrot.space:/mnt/elfstone2/syncthing" "/mnt/elessar-syncthing";