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restic/internal/cache/dir.go

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package cache
import (
"os"
"path/filepath"
"github.com/pkg/errors"
"github.com/restic/restic/internal/debug"
"github.com/restic/restic/internal/fs"
)
// getXDGCacheDir returns the cache directory according to XDG basedir spec, see
// http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
func getXDGCacheDir() (string, error) {
xdgcache := os.Getenv("XDG_CACHE_HOME")
home := os.Getenv("HOME")
if xdgcache == "" && home == "" {
return "", errors.New("unable to locate cache directory (XDG_CACHE_HOME and HOME unset)")
}
cachedir := ""
if xdgcache != "" {
cachedir = filepath.Join(xdgcache, "restic")
} else if home != "" {
cachedir = filepath.Join(home, ".cache", "restic")
}
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
}