/
osutil.go
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/
osutil.go
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// Copyright (c) 2016-2019 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 osutil
import (
"bufio"
"fmt"
"io"
"os"
"path"
)
// IsEmpty returns true if directory dir is empty.
func IsEmpty(dir string) (bool, error) {
f, err := os.Open(dir)
if err != nil {
return false, err
}
defer f.Close()
_, err = f.Readdirnames(1)
if err == io.EOF {
return true, nil
}
return false, err
}
// ReadLines returns a list of lines in filename.
func ReadLines(f *os.File) ([]string, error) {
var lines []string
s := bufio.NewScanner(f)
s.Split(bufio.ScanLines)
for s.Scan() {
l := s.Text()
lines = append(lines, l)
}
return lines, nil
}
// EnsureFilePresent initializes a file and all parent directories for filepath
// if they do not exist. If the file exists, no-ops.
func EnsureFilePresent(filepath string, perm os.FileMode) error {
if _, err := os.Stat(filepath); os.IsNotExist(err) {
err := os.MkdirAll(path.Dir(filepath), perm)
if err != nil {
return fmt.Errorf("mkdir: %s", err)
}
f, err := os.Create(filepath)
if err != nil {
return fmt.Errorf("create: %s", err)
}
f.Close()
} else if err != nil {
return fmt.Errorf("stat: %s", err)
}
return nil
}