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map_subst.go
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/
map_subst.go
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// Copyright 2023 Chainguard, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package util
import (
"fmt"
"chainguard.dev/melange/pkg/cond"
)
// Given a string and a map, replace the variables in the string with values in the map
func MutateStringFromMap(with map[string]string, input string) (string, error) {
lookupWith := func(key string) (string, error) {
if val, ok := with[key]; ok {
return val, nil
}
nk := fmt.Sprintf("${{%s}}", key)
if val, ok := with[nk]; ok {
return val, nil
}
return "", fmt.Errorf("variable %s not defined", key)
}
return cond.Subst(input, lookupWith)
}