zfs/tests/zfs-tests/tests/functional/channel_program/synctask_core/tst.set_props.zcp

--
-- This file and its contents are supplied under the terms of the
-- Common Development and Distribution License ("CDDL"), version 1.0.
-- You may only use this file in accordance with the terms of version
-- 1.0 of the CDDL.
--
-- A full copy of the text of the CDDL should have accompanied this
-- source.  A copy of the CDDL is also available via the Internet at
-- http://www.illumos.org/license/CDDL.
--

--
-- Copyright (c) 2017 by Delphix. All rights reserved.
-- Copyright 2020 Joyent, Inc.
--

arg = ...
fs = arg["argv"][1]

-- values from zfs.h
maxname = 256       -- ZAP_MAXNAMELEN
maxvalue = 8192     -- ZAP_MAXVALUELEN

pos_props = {}
neg_props = {}

-- In lua, strings are immutable, so to avoid a bunch of copies, we
-- build the value in a table and use concat (which appears to be the
-- recommend method for such things).
largeprop = {}
for i = 0,maxvalue,8
do
    table.insert(largeprop, "aaaaaaaa")
end
-- add an extra character so we spill over the limit
table.insert(largeprop, "b")

largepropv = table.concat(largeprop)

largepropname = { "b:" }
for i = 0,maxname,8
do
    table.insert(largepropname, "aaaaaaaa")
end
largepropnamev = table.concat(largepropname)

pos_props["a:prop"] = {"hello"}

-- For neg_props, an optional expected error value can be added after the
-- property value as seen below.
neg_props["notaproperty"] = {"hello", EINVAL}
neg_props["a:very.long.property.value"] = { largepropv, E2BIG }
neg_props[largepropnamev] = {"greetings", ENAMETOOLONG }

-- non-user properties aren't currently supported
-- Even if they were, the argument must be a string due to requirements of
-- the ZCP api.
neg_props["mountpoint"] = {"/foo/bar"}
neg_props["copies"] = { "2" }

-- read-only properties should never succeed
neg_props["guid"] = { "12345" }

set_fail = {}
val_fail = {}

-- Test properties that should work
for prop, values in pairs(pos_props) do
    for i, val in ipairs(values) do
        old_val, src = zfs.get_prop(fs, prop)

        -- Attempt to set the property to the specified value
        err = zfs.sync.set_prop(fs, prop, val)

        if (err ~= 0) then
            set_fail[prop] = err -- tuple of prop, val that resulted in error
        else
            -- use get_prop to check that the set took affect
            new_val, src = zfs.get_prop(fs, prop)
            if (tostring(new_val) ~= tostring(val)) then
                val_fail[prop] = new_val
            end

            -- We modified the prop, restore old value (if one existed)
            if (old_val ~= nil) then
                err = zfs.sync.set_prop(fs, prop, old_val)
                if (err ~= 0) then return err end
            else
                -- Didn't have an old value, delete (inherit) instead
                err = zfs.sync.inherit(fs, prop)
                if (err ~= 0) then return err end
            end
        end
    end
end

-- Test properties that should fail
for prop, expected in pairs(neg_props) do
    exp_val = expected[1]
    exp_err = expected[2]

    -- Attempt to set the property to the specified value
    err = zfs.sync.set_prop(fs, prop, exp_val)
    if (err == 0 or (exp_err ~= nil and err ~= exp_err)) then
        set_fail[prop] = err -- tuple of prop, val that resulted in error
    end
end

return {set_fail, val_fail}