58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
package common
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import (
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"fmt"
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"github.com/mitchellh/mapstructure"
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"github.com/mitchellh/packer/packer"
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"sort"
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"strings"
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)
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// CheckUnusedConfig is a helper that makes sure that the there are no
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// unused configuration keys, properly ignoring keys that don't matter.
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func CheckUnusedConfig(md *mapstructure.Metadata) *packer.MultiError {
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errs := make([]error, 0)
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if md.Unused != nil && len(md.Unused) > 0 {
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sort.Strings(md.Unused)
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for _, unused := range md.Unused {
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if unused != "type" && !strings.HasPrefix(unused, "packer_") {
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errs = append(
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errs, fmt.Errorf("Unknown configuration key: %s", unused))
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}
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}
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}
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if len(errs) > 0 {
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return &packer.MultiError{errs}
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}
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return nil
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}
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// DecodeConfig is a helper that handles decoding raw configuration using
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// mapstructure. It returns the metadata and any errors that may happen.
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// If you need extra configuration for mapstructure, you should configure
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// it manually and not use this helper function.
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func DecodeConfig(target interface{}, raws ...interface{}) (*mapstructure.Metadata, error) {
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var md mapstructure.Metadata
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decoderConfig := &mapstructure.DecoderConfig{
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Metadata: &md,
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Result: target,
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}
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decoder, err := mapstructure.NewDecoder(decoderConfig)
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if err != nil {
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return nil, err
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}
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for _, raw := range raws {
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err := decoder.Decode(raw)
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if err != nil {
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return nil, err
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}
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}
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return &md, nil
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}
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