restic/internal/cache/dir.go

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package cache
import (
"fmt"
"os"
"path/filepath"
"github.com/pkg/errors"
"github.com/restic/restic/internal/debug"
"github.com/restic/restic/internal/fs"
)
// DefaultDir returns $RESTIC_CACHE_DIR, or the default cache directory
// for the current OS if that variable is not set.
func DefaultDir() (cachedir string, err error) {
cachedir = os.Getenv("RESTIC_CACHE_DIR")
if cachedir != "" {
return cachedir, nil
}
cachedir, err = os.UserCacheDir()
if err != nil {
return "", fmt.Errorf("unable to locate cache directory: %v", err)
}
return filepath.Join(cachedir, "restic"), nil
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}
// mkdirCacheDir ensures that the cache directory exists. It it didn't, created
// is set to true.
func mkdirCacheDir(cachedir string) (created bool, err error) {
var newCacheDir bool
fi, err := fs.Stat(cachedir)
if os.IsNotExist(errors.Cause(err)) {
err = fs.MkdirAll(cachedir, 0700)
if err != nil {
return true, errors.Wrap(err, "MkdirAll")
}
fi, err = fs.Stat(cachedir)
debug.Log("create cache dir %v", cachedir)
newCacheDir = true
}
if err != nil {
return newCacheDir, errors.Wrap(err, "Stat")
}
if !fi.IsDir() {
return newCacheDir, errors.Errorf("cache dir %v is not a directory", cachedir)
}
return newCacheDir, nil
}