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Fix a number of crashes involving unknown nodes, also fix fishbuckets on_place (#3914)
Fixes: #3913 #3915 ~~You can reproduce the crash by placing a fish bucket on top snow above an unknown node. I also noticed that the code always uses pointed_thing.above so I fixed that and also added a function to mcl_utils to figure out where a node should be placed (either above or below). Looks like the rest of the code could also use improvement but at least it does not crash now.~~ Cora fixed a bunch of related crashes in Mineclona so I am replacing my commit and cherry picking all her commits here. https://codeberg.org/mineclonia/mineclonia/pulls/549 Here is the list of fixes from that PR: - Crash when placing snow layer on unknown nodes - Crash when snow layers on unknown nodes are flooded - Crash when placing fishbucket on snow on top of unknown nodes - Crash when placing chorus flower and stem on unknown - Crash when placing mob spawners on unknown - The fishbucket on place to actually replace buildable_to Co-authored-by: cora <coradelamouche@gmx.ch> Reviewed-on: https://git.minetest.land/MineClone2/MineClone2/pulls/3914 Reviewed-by: ancientmarinerdev <ancientmariner_dev@proton.me> Co-authored-by: 𝕵𝖔𝖍𝖆𝖓𝖓𝖊𝖘 𝕱𝖗𝖎𝖙𝖟 <mrrar@noreply.git.minetest.land> Co-committed-by: 𝕵𝖔𝖍𝖆𝖓𝖓𝖊𝖘 𝕱𝖗𝖎𝖙𝖟 <mrrar@noreply.git.minetest.land>
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@ -18,13 +18,21 @@ local function on_place_fish(itemstack, placer, pointed_thing)
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return new_stack
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end
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local pos = pointed_thing.above or pointed_thing.under
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if not pos then return end
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local n = minetest.get_node_or_nil(pos)
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if n.name and minetest.registered_nodes[n.name].buildable_to or n.name == "mcl_portals:portal" then
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local fish = itemstack:get_name():gsub(fishbucket_prefix,"")
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if fish_names[fish] then
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local o = minetest.add_entity(pos, "mobs_mc:" .. fish)
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if pointed_thing.type ~= "node" then return end
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local pos = pointed_thing.above
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local n = minetest.get_node(pointed_thing.above)
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local def = minetest.registered_nodes[minetest.get_node(pointed_thing.under).name]
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if ( def and def.buildable_to ) or n.name == "mcl_portals:portal" then
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pos = pointed_thing.under
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n = minetest.get_node(pointed_thing.under)
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end
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local fish = itemstack:get_definition()._mcl_buckets_fish
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if fish_names[fish] then
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local o = minetest.add_entity(pos, "mobs_mc:" .. fish)
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if o and o:get_pos() then
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local props = itemstack:get_meta():get_string("properties")
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if props ~= "" then
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o:set_properties(minetest.deserialize(props))
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@ -60,6 +68,7 @@ for techname, fishname in pairs(fish_names) do
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stack_max = 1,
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groups = {bucket = 1, fish_bucket = 1},
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liquids_pointable = false,
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_mcl_buckets_fish = techname,
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on_place = on_place_fish,
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on_secondary_use = on_place_fish,
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_on_dispense = function(stack, pos, droppos, dropnode, dropdir)
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@ -1581,7 +1581,7 @@ end
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-- MUST NOT be called if there is a snow cover node above pos.
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function mcl_core.clear_snow_dirt(pos, node)
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local def = minetest.registered_nodes[node.name]
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if def._mcl_snowless then
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if def and def._mcl_snowless then
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minetest.swap_node(pos, {name = def._mcl_snowless, param2=node.param2})
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end
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end
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@ -1602,7 +1602,7 @@ function mcl_core.on_snowable_construct(pos)
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-- Make snowed if needed
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if minetest.get_item_group(anode.name, "snow_cover") == 1 then
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local def = minetest.registered_nodes[node.name]
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if def._mcl_snowed then
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if def and def._mcl_snowed then
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minetest.swap_node(pos, {name = def._mcl_snowed, param2=node.param2})
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end
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end
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@ -1623,7 +1623,7 @@ function mcl_core.on_snow_construct(pos)
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local npos = {x=pos.x, y=pos.y-1, z=pos.z}
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local node = minetest.get_node(npos)
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local def = minetest.registered_nodes[node.name]
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if def._mcl_snowed then
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if def and def._mcl_snowed then
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minetest.swap_node(npos, {name = def._mcl_snowed, param2=node.param2})
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end
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end
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@ -1038,7 +1038,7 @@ for i=1,8 do
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-- Get position where snow would be placed
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local target
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if minetest.registered_nodes[unode.name].buildable_to then
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if def and def.buildable_to then
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target = under
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else
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target = above
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@ -155,7 +155,8 @@ minetest.register_node("mcl_end:chorus_flower", {
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1) On top of end stone or chorus plant
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2) On top of air and horizontally adjacent to exactly 1 chorus plant ]]
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local pos
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if minetest.registered_nodes[node_under.name].buildable_to then
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local def = minetest.registered_nodes[node_under.name]
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if def and def.buildable_to then
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pos = pointed_thing.under
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else
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pos = pointed_thing.above
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@ -283,7 +284,8 @@ minetest.register_node("mcl_end:chorus_plant", {
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condition is met:
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- placed on end stone or any chorus node ]]
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local pos_place, node_check
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if minetest.registered_nodes[node_under.name].buildable_to then
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local def = minetest.registered_nodes[node_under.name]
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if def and def.buildable_to then
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pos_place = pointed_thing.under
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node_check = node_above
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else
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@ -301,7 +301,8 @@ minetest.register_node("mcl_mobspawners:spawner", {
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local new_itemstack, success = minetest.item_place(itemstack, placer, pointed_thing)
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if success then
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local placepos
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if minetest.registered_nodes[node_under.name].buildable_to then
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local def = minetest.registered_nodes[node_under.name]
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if def and def.buildable_to then
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placepos = pointed_thing.under
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else
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placepos = pointed_thing.above
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