1 files changed, 27 insertions, 0 deletions
diff --git a/internal/conf/utils.go b/internal/conf/utils.go
new file mode 100644
index 00000000..ad716018
--- /dev/null
+++ b/internal/conf/utils.go
@@ -0,0 +1,27 @@
+// Copyright 2020 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package conf
+
+import (
+	"strings"
+
+	"github.com/pkg/errors"
+
+	"gogs.io/gogs/internal/process"
+)
+
+// openSSHVersion returns string representation of OpenSSH version via command "ssh -V".
+func openSSHVersion() (string, error) {
+	// NOTE: Somehow the version is printed to stderr.
+	_, stderr, err := process.Exec("conf.openSSHVersion", "ssh", "-V")
+	if err != nil {
+		return "", errors.Wrap(err, stderr)
+	}
+
+	// Trim unused information, see https://github.com/gogs/gogs/issues/4507#issuecomment-305150441.
+	v := strings.TrimRight(strings.Fields(stderr)[0], ",1234567890")
+	v = strings.TrimSuffix(strings.TrimPrefix(v, "OpenSSH_"), "p")
+	return v, nil
+}