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53 lines
1.6 KiB
53 lines
1.6 KiB
/*
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Copyright 2018 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package lua
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import (
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"fmt"
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"path/filepath"
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"github.com/yuin/gopher-lua"
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hapi "k8s.io/helm/pkg/hapi/chart"
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)
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// LoadScripts is a depth-first script loader for Lua scripts
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//
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// It walks the chart and all dependencies, loading the ext/lua/chart.lua
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// script for each chart.
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//
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// If a script fails to load, loading immediately ceases and the error is returned.
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func LoadScripts(vm *lua.LState, chart *hapi.Chart) error {
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// We go depth first so that the top level chart gets the final word.
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// That is, the top level chart should be able to modify objects that the
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// child charts set.
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for _, child := range chart.Dependencies {
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LoadScripts(vm, child)
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}
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// For now, we only load a `chart.lua`, since that is how other Lua impls
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// do it (e.g. single entrypoint, not multi).
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for _, script := range chart.Ext {
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target := filepath.Join("ext", "lua", "chart.lua")
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if script.Name == target {
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if err := vm.DoString(string(script.Data)); err != nil {
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return fmt.Errorf("failed to execute Lua for %s: %s", chart.Metadata.Name, err)
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}
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}
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}
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return nil
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}
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