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// SPDX-License-Identifier: GPL-2.0-or-later
// blockd mount registration for uvol
// (c) 2022 Daniel Golle <daniel@makrotopia.org>
//
// Register volumes with blockd over ubus instead of writing /etc/config/fstab,
// so volume state stays on the self-describing backing store and never leaks
// into the firmware rootfs.
let mount_fs = require("fs");
let mount_ubus = require("ubus");
let uvol_target = function(vol_name) {
return sprintf("/tmp/run/uvol/%s", vol_name);
};
uvol_mount = {
register: function(vol_name, dev_name, read_only) {
if (!dev_name)
return 22;
if (substr(vol_name, 0, 1) == "." && vol_name != ".meta")
return 1;
let target = uvol_target(vol_name);
let st = mount_fs.lstat(target);
if (st && st.type == "link")
mount_fs.unlink(target);
else if (st && st.type == "directory")
mount_fs.rmdir(target);
let data = {
device: dev_name,
target: target,
autofs: 1,
};
// declare the volume's read-only-ness to blockd, which carries it
// to block as a mount option; block never guesses from the fs type.
if (read_only)
data.options = "ro";
else
data.check_fs = 1;
mount_ubus.call({
object: "block",
method: "hotplug",
data: data,
});
return mount_ubus.error() ? -1 : 0;
},
unregister: function(dev_name) {
if (!dev_name)
return 22;
mount_ubus.call({
object: "block",
method: "hotplug",
data: {
device: dev_name,
remove: 1,
},
});
return mount_ubus.error() ? -1 : 0;
}
};
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