/
file.go
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/
file.go
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/*
* Copyright (c) 2018 Uber Technologies, Inc.
*
* 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 utils
import (
"os"
"path/filepath"
"strings"
)
// FileExists returns whether or not the specified file (or symlink to
// a file) exists.
func FileExists(path string) bool {
_, err := os.Stat(path)
return !os.IsNotExist(err)
}
// IsDirectory returns true if the file exists and it is a directory.
func IsDirectory(path string) bool {
fileInfo, err := os.Stat(path)
if err != nil {
return false
}
return fileInfo.IsDir()
}
// IsWithinPath returns whether or not path is within the heirarchy of
// basepath.
func IsWithinPath(basepath string, path string) bool {
rel, err := filepath.Rel(basepath, path)
return err == nil && !strings.HasPrefix(rel, "..")
}