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find.go
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find.go
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// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 main
import (
"errors"
"os/exec"
"runtime"
)
// Find the path to the fusermount command for this system, returning "" if
// we're not running on Linux.
func findFusermount() (p string, err error) {
if runtime.GOOS != "linux" {
return
}
// HACK(jacobsa): Since mount(8) appears to call its helpers with $PATH
// unset, I can find no better way to do this than searching a hard-coded
// list of candidates. These are directories where I've seen it live on
// various distributions.
candidates := []string{
"/bin/fusermount",
"/usr/bin/fusermount",
}
for _, c := range candidates {
_, err = exec.LookPath(c)
if err == nil {
p = c
return
}
}
err = errors.New("Can't find a usable executable.")
return
}
// Find the path to the gcsfuse program.
func findGcsfuse() (p string, err error) {
// HACK(jacobsa): Since mount(8) appears to call its helpers with $PATH
// unset, I can find no better way to do this than searching a hard-coded
// list of candidates. However, include as a candidate the $PATH-relative
// version in case we are being called in a context with $PATH set, such as
// a test.
candidates := []string{
"gcsfuse",
"/usr/bin/gcsfuse",
"/usr/local/bin/gcsfuse",
}
for _, c := range candidates {
_, err = exec.LookPath(c)
if err == nil {
p = c
return
}
}
err = errors.New("Can't find a usable executable.")
return
}