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fs.go
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fs.go
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// Copyright (C) 2023 Gobalsky Labs Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package fs
import (
"errors"
"fmt"
"io/fs"
"os"
"path/filepath"
)
var ErrIsADirectory = errors.New("is a directory")
// EnsureDir will make sure a directory exists or is created at the given path.
func EnsureDir(path string) error {
_, err := os.Stat(path)
if err != nil {
if os.IsNotExist(err) {
return os.MkdirAll(path, os.ModeDir|0o700)
}
return err
}
return nil
}
// PathExists returns whether a link exists at the given path.
func PathExists(path string) (bool, error) {
_, err := os.Stat(path)
if err == nil {
return true, nil
}
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
// FileExists similar to PathExists, but ensures the path is to a file, not a
// directory.
func FileExists(path string) (bool, error) {
fileInfo, err := os.Stat(path)
if err == nil {
if fileInfo.IsDir() {
return false, ErrIsADirectory
}
return true, nil
}
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
func ReadFile(path string) ([]byte, error) {
dir, fileName := filepath.Split(path)
if len(dir) == 0 {
dir = "."
}
buf, err := fs.ReadFile(os.DirFS(dir), fileName)
if err != nil {
return nil, fmt.Errorf("couldn't read file: %w", err)
}
return buf, nil
}
func WriteFile(path string, content []byte) error {
f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o600)
if err != nil {
return fmt.Errorf("couldn't create file: %w", err)
}
defer f.Close()
_, err = f.Write(content)
if err != nil {
return fmt.Errorf("couldn't write file: %w", err)
}
return nil
}