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//go:build !gitaly_test_signing
package git2goutil
import (
"bytes"
"fmt"
"os"
"strings"
"github.com/ProtonMail/go-crypto/openpgp"
"github.com/ProtonMail/go-crypto/openpgp/packet"
)
// CreateCommitSignature reads the given signing key and produces PKCS#7 detached signature.
// When the path to the signing key is not present, an empty signature is returned.
func CreateCommitSignature(signingKeyPath, contentToSign string) (string, error) {
if signingKeyPath == "" {
return "", nil
}
file, err := os.Open(signingKeyPath)
if err != nil {
return "", fmt.Errorf("open file: %w", err)
}
entity, err := openpgp.ReadEntity(packet.NewReader(file))
if err != nil {
return "", fmt.Errorf("read entity: %w", err)
}
sigBuf := new(bytes.Buffer)
if err := openpgp.ArmoredDetachSignText(
sigBuf,
entity,
strings.NewReader(contentToSign),
&packet.Config{},
); err != nil {
return "", fmt.Errorf("sign commit: %w", err)
}
return sigBuf.String(), nil
}
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