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util.go
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util.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 apk
import (
"archive/tar"
"errors"
"fmt"
"io"
"strings"
"golang.org/x/exp/slices"
)
func uniqify[T comparable](s []T) []T {
seen := make(map[T]struct{}, len(s))
uniq := make([]T, 0, len(s))
for _, v := range s {
if _, ok := seen[v]; ok {
continue
}
uniq = append(uniq, v)
seen[v] = struct{}{}
}
return uniq
}
func controlValue(controlTar io.Reader, want ...string) (map[string][]string, error) {
tr := tar.NewReader(controlTar)
mapping := map[string][]string{}
for {
header, err := tr.Next()
if errors.Is(err, io.EOF) {
break
}
if err != nil {
return nil, err
}
// ignore .PKGINFO as it is not a script
if header.Name != ".PKGINFO" {
continue
}
b, err := io.ReadAll(tr)
if err != nil {
return nil, fmt.Errorf("unable to read .PKGINFO from control tar.gz file: %w", err)
}
lines := strings.Split(string(b), "\n")
for _, line := range lines {
parts := strings.Split(line, "=")
if len(parts) != 2 {
continue
}
key := strings.TrimSpace(parts[0])
if !slices.Contains(want, key) {
continue
}
values, ok := mapping[key]
if !ok {
values = []string{}
}
value := strings.TrimSpace(parts[1])
values = append(values, value)
mapping[key] = values
}
break
}
return mapping, nil
}