// Copyright 2021 Google LLC
//
// 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 fuse

import (
	"os/exec"

	"github.com/GoogleCloudPlatform/cloudsql-proxy/logging"
)

// Supported returns true if the current system supports FUSE.
func Supported() bool {
	// This code follows the same strategy found in hanwen/go-fuse.
	// See https://github.com/hanwen/go-fuse/blob/0f728ba15b38579efefc3dc47821882ca18ffea7/fuse/mount_linux.go#L184-L198.
	if _, err := exec.LookPath("fusermount"); err != nil {
		if _, err := exec.LookPath("/bin/fusermount"); err != nil {
			logging.Errorf("Failed to find fusermount binary in PATH or /bin. Verify FUSE installation and try again.")
			return false
		}
	}
	return true
}