define-alpine/modules/data.lua

local utils = require "../utils"
local t = require "../utils/templater"
local dirs = {}
local links = {}

local function generate_mount_data()
	local string = "#!/bin/sh\n"
	for i=1,#dirs do
		local dir = dirs[i]
		if dir.type == "file" then
			touch(dir.mountpoint)
			string = string .. t([[
mkdir -p '{{dirname}}' || exit 1
touch -a '{{path}}' || exit 1
mount '{{path}}' '{{mountpoint}}' -o bind,umask=100,uid={{uid}},gid={{gid}} || exit 1
]],
				{ dirname = utils.dirname(dir.path),
				path = dir.path, mountpoint = dir.mountpoint, uid = dir.uid, gid = dir.gid }
			)
		elseif dir.type == "dir" then
			mkdir(dir.mountpoint)
			string = string .. t([[
mkdir -p '{{path}}' || exit 1
mount '{{path}}' '{{mountpoint}}' -o bind,umask=100,uid={{uid}},gid={{gid}} || exit 1
]],
				dir
			)
		end
	end
	for i=1,#links do
		local link = links[i]
		string = string .. t([[
mkdir -p '{{dirname}}' || exit 1
ln -s '{{target}}' '{{path}}' || exit 1
]],
			{ dirname = utils.dirname(link.path),
			target = link.target, path = link.path }
		)
	end
	add_file("/usr/local/bin/mount-data", string)
	chmod("/usr/local/bin/mount-data", 700)
end
local function add_data_dir(path, mountpoint, uid, gid)
	table.insert(dirs, {
		type = "dir",
		path = path, mountpoint = mountpoint, uid = uid, gid = gid
	})
	generate_mount_data()
end
local function add_data_file(path, mountpoint, uid, gid)
	table.insert(dirs, {
		type = "file",
		path = path, mountpoint = mountpoint, uid = uid, gid = gid
	})
	generate_mount_data()
end
local function add_data_link(target, path)
	table.insert(links, { target = target, path = path })
	generate_mount_data()
end

modules.data = {
	add_data_dir = add_data_dir,
	add_data_file = add_data_file,
	add_data_link = add_data_link,
}

mkdir("/data")
-- XXX: hardcodeado
modules.fstab.add_mount("/dev/sdb /data ext4 defaults 0 0")