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Windows, and to a lesser extent OS X, don't conform to XDG and have their own preferred locations for caches. On Windows, use %LOCALAPPDATA%/restic (i.e., ~/AppData/Local/restic). I can't find authoritative documentation from Microsoft recommending specifically which of %APPDATA%, %LOCALAPPDATA%, and %TEMP% should be used for caches, but %LOCALAPPDATA% is where browsers store their caches, so it seems like a good fit. On OS X, use ~/Library/Caches/restic, which is recommended by the Apple documentation. They do suggest using the application "bundle identifier" as the base folder name, but restic doesn't have one, so I just used "restic".
90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
package cache
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import (
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"os"
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"path/filepath"
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"runtime"
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"github.com/pkg/errors"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/fs"
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)
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// xdgCacheDir returns the cache directory according to XDG basedir spec, see
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// http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
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func xdgCacheDir() (string, error) {
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xdgcache := os.Getenv("XDG_CACHE_HOME")
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home := os.Getenv("HOME")
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if xdgcache != "" {
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return filepath.Join(xdgcache, "restic"), nil
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} else if home != "" {
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return filepath.Join(home, ".cache", "restic"), nil
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}
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return "", errors.New("unable to locate cache directory (XDG_CACHE_HOME and HOME unset)")
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}
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// windowsCacheDir returns the cache directory for Windows.
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//
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// Uses LOCALAPPDATA, where application data not synchronized between machines
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// is stored. (Browser caches stored here).
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func windowsCacheDir() (string, error) {
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appdata := os.Getenv("LOCALAPPDATA")
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if appdata == "" {
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return "", errors.New("unable to locate cache directory (APPDATA unset)")
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}
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return filepath.Join(appdata, "restic"), nil
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}
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// darwinCacheDir returns the cache directory for darwin.
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//
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// Uses ~/Library/Caches/, which is recommended by Apple, see
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// https://developer.apple.com/library/content/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/MacOSXDirectories/MacOSXDirectories.html
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func darwinCacheDir() (string, error) {
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home := os.Getenv("HOME")
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if home == "" {
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return "", errors.New("unable to locate cache directory (HOME unset)")
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}
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return filepath.Join(home, "Library", "Caches", "restic"), nil
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}
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// defaultCacheDir determines and creates the default cache directory for this
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// system.
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func defaultCacheDir() (string, error) {
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var cachedir string
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var err error
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switch runtime.GOOS {
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case "darwin":
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cachedir, err = darwinCacheDir()
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case "windows":
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cachedir, err = windowsCacheDir()
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default:
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// Default to XDG for Linux and any other OSes.
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cachedir, err = xdgCacheDir()
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}
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if err != nil {
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return "", err
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}
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fi, err := fs.Stat(cachedir)
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if os.IsNotExist(errors.Cause(err)) {
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err = fs.MkdirAll(cachedir, 0700)
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if err != nil {
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return "", errors.Wrap(err, "MkdirAll")
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}
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fi, err = fs.Stat(cachedir)
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debug.Log("create cache dir %v", cachedir)
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}
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if err != nil {
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return "", errors.Wrap(err, "Stat")
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}
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if !fi.IsDir() {
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return "", errors.Errorf("cache dir %v is not a directory", cachedir)
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}
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return cachedir, nil
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}
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