mirror of https://github.com/restic/restic.git
69 lines
1.4 KiB
Go
69 lines
1.4 KiB
Go
// Copyright 2016 (C) Mitchell Hashimoto
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// Distributed under the MIT License.
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// Package homedir implements a portable function to determine current user's homedir.
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package homedir
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import (
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"errors"
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"path/filepath"
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"sync"
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)
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// DisableCache will disable caching of the home directory. Caching is enabled
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// by default.
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var DisableCache bool
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var homedirCache string
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var cacheLock sync.Mutex
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// Dir returns the home directory for the executing user.
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//
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// This uses an OS-specific method for discovering the home directory.
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// An error is returned if a home directory cannot be detected.
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func Dir() (string, error) {
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cacheLock.Lock()
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defer cacheLock.Unlock()
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// Return cached homedir if available.
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if !DisableCache {
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if homedirCache != "" {
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return homedirCache, nil
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}
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}
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// Determine OS speific current homedir.
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result, err := dir()
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if err != nil {
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return "", err
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}
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// Cache for future lookups.
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homedirCache = result
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return result, nil
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}
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// Expand expands the path to include the home directory if the path
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// is prefixed with `~`. If it isn't prefixed with `~`, the path is
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// returned as-is.
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func Expand(path string) (string, error) {
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if len(path) == 0 {
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return path, nil
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}
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if path[0] != '~' {
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return path, nil
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}
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if len(path) > 1 && path[1] != '/' && path[1] != '\\' {
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return "", errors.New("cannot expand user-specific home dir")
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}
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dir, err := Dir()
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if err != nil {
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return "", err
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}
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return filepath.Join(dir, path[1:]), nil
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}
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