package cache import ( "os" "path/filepath" "runtime" "github.com/pkg/errors" "github.com/restic/restic/internal/debug" "github.com/restic/restic/internal/fs" ) // xdgCacheDir returns the cache directory according to XDG basedir spec, see // http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html func xdgCacheDir() (string, error) { xdgcache := os.Getenv("XDG_CACHE_HOME") home := os.Getenv("HOME") if xdgcache != "" { return filepath.Join(xdgcache, "restic"), nil } else if home != "" { return filepath.Join(home, ".cache", "restic"), nil } return "", errors.New("unable to locate cache directory (XDG_CACHE_HOME and HOME unset)") } // windowsCacheDir returns the cache directory for Windows. // // Uses LOCALAPPDATA, where application data not synchronized between machines // is stored. (Browser caches stored here). func windowsCacheDir() (string, error) { appdata := os.Getenv("LOCALAPPDATA") if appdata == "" { return "", errors.New("unable to locate cache directory (APPDATA unset)") } return filepath.Join(appdata, "restic"), nil } // darwinCacheDir returns the cache directory for darwin. // // Uses ~/Library/Caches/, which is recommended by Apple, see // https://developer.apple.com/library/content/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/MacOSXDirectories/MacOSXDirectories.html func darwinCacheDir() (string, error) { home := os.Getenv("HOME") if home == "" { return "", errors.New("unable to locate cache directory (HOME unset)") } return filepath.Join(home, "Library", "Caches", "restic"), nil } // defaultCacheDir determines and creates the default cache directory for this // system. func defaultCacheDir() (string, error) { var cachedir string var err error switch runtime.GOOS { case "darwin": cachedir, err = darwinCacheDir() case "windows": cachedir, err = windowsCacheDir() default: // Default to XDG for Linux and any other OSes. cachedir, err = xdgCacheDir() } if err != nil { return "", err } fi, err := fs.Stat(cachedir) if os.IsNotExist(errors.Cause(err)) { err = fs.MkdirAll(cachedir, 0700) if err != nil { return "", errors.Wrap(err, "MkdirAll") } fi, err = fs.Stat(cachedir) debug.Log("create cache dir %v", cachedir) } if err != nil { return "", errors.Wrap(err, "Stat") } if !fi.IsDir() { return "", errors.Errorf("cache dir %v is not a directory", cachedir) } return cachedir, nil }