From ec73ec092d149e20e13cdb0f4b9dbefa9d21a19e Mon Sep 17 00:00:00 2001
From: Tobias Hildebrandt
 <79341166+tobias-hildebrandt@users.noreply.github.com>
Date: Sat, 20 Mar 2021 18:54:17 +0000
Subject: [PATCH] cmd/utils: fix compilation issue on openbsd (#22511)

---
 cmd/utils/diskusage.go         |  2 +-
 cmd/utils/diskusage_openbsd.go | 43 ++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 cmd/utils/diskusage_openbsd.go

diff --git a/cmd/utils/diskusage.go b/cmd/utils/diskusage.go
index da696de6b..c3d51765f 100644
--- a/cmd/utils/diskusage.go
+++ b/cmd/utils/diskusage.go
@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-// +build !windows
+// +build !windows,!openbsd
 
 package utils
 
diff --git a/cmd/utils/diskusage_openbsd.go b/cmd/utils/diskusage_openbsd.go
new file mode 100644
index 000000000..54f759d29
--- /dev/null
+++ b/cmd/utils/diskusage_openbsd.go
@@ -0,0 +1,43 @@
+// Copyright 2021 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build openbsd
+
+package utils
+
+import (
+	"fmt"
+
+	"golang.org/x/sys/unix"
+)
+
+func getFreeDiskSpace(path string) (uint64, error) {
+	var stat unix.Statfs_t
+	if err := unix.Statfs(path, &stat); err != nil {
+		return 0, fmt.Errorf("failed to call Statfs: %v", err)
+	}
+
+	// Available blocks * size per block = available space in bytes
+	var bavail = stat.F_bavail
+	// Not sure if the following check is necessary for OpenBSD
+	if stat.F_bavail < 0 {
+		// FreeBSD can have a negative number of blocks available
+		// because of the grace limit.
+		bavail = 0
+	}
+	//nolint:unconvert
+	return uint64(bavail) * uint64(stat.F_bsize), nil
+}