mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2024-12-25 12:57:18 +00:00
77 lines
1.7 KiB
Go
77 lines
1.7 KiB
Go
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package fileutil
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import (
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"io/ioutil"
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"os"
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"os/user"
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"path"
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"path/filepath"
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"strings"
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"github.com/pkg/errors"
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)
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// ExpandPath given a string which may be a relative path.
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// 1. replace tilde with users home dir
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// 2. expands embedded environment variables
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// 3. cleans the path, e.g. /a/b/../c -> /a/c
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// Note, it has limitations, e.g. ~someuser/tmp will not be expanded
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func ExpandPath(p string) (string, error) {
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if strings.HasPrefix(p, "~/") || strings.HasPrefix(p, "~\\") {
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if home := HomeDir(); home != "" {
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p = home + p[1:]
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}
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}
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return filepath.Abs(path.Clean(os.ExpandEnv(p)))
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}
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// HomeDir for a user.
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func HomeDir() string {
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if home := os.Getenv("HOME"); home != "" {
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return home
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}
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if usr, err := user.Current(); err == nil {
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return usr.HomeDir
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}
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return ""
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}
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// HasDir checks if a directory indeed exists at the specified path.
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func HasDir(dirPath string) (bool, error) {
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fullPath, err := ExpandPath(dirPath)
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if err != nil {
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return false, err
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}
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info, err := os.Stat(fullPath)
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if os.IsNotExist(err) {
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return false, nil
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}
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if info == nil {
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return false, err
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}
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return info.IsDir(), err
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}
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// FileExists returns true if a file is not a directory and exists
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// at the specified path.
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func FileExists(filename string) bool {
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filePath, err := ExpandPath(filename)
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if err != nil {
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return false
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}
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info, err := os.Stat(filePath)
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if os.IsNotExist(err) {
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return false
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}
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return !info.IsDir()
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}
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// ReadFileAsBytes expands a file name's absolute path and reads it as bytes from disk.
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func ReadFileAsBytes(filename string) ([]byte, error) {
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filePath, err := ExpandPath(filename)
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if err != nil {
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return nil, errors.Wrap(err, "could not determine absolute path of password file")
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}
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return ioutil.ReadFile(filePath)
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}
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