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package vfs
import (
"errors"
"io/fs"
"path/filepath"
)
// A MkdirStater implements all the functionality needed by MkdirAll.
type MkdirStater interface {
Mkdir(name string, perm fs.FileMode) error
Stat(name string) (fs.FileInfo, error)
}
// MkdirAll is equivalent to os.MkdirAll but operates on fileSystem.
func MkdirAll(fileSystem MkdirStater, path string, perm fs.FileMode) error {
err := fileSystem.Mkdir(path, perm)
switch {
case err == nil:
// Mkdir was successful.
return nil
case errors.Is(err, fs.ErrExist):
// path already exists, but we don't know whether it's a directory or
// something else. We get this error if we try to create a subdirectory
// of a non-directory, for example if the parent directory of path is a
// file. There's a race condition here between the call to Mkdir and the
// call to Stat but we can't avoid it because there's not enough
// information in the returned error from Mkdir. We need to distinguish
// between "path already exists and is already a directory" and "path
// already exists and is not a directory". Between the call to Mkdir and
// the call to Stat path might have changed.
info, statErr := fileSystem.Stat(path)
if statErr != nil {
return statErr
}
if !info.IsDir() {
return err
}
return nil
case errors.Is(err, fs.ErrNotExist):
// Parent directory does not exist. Create the parent directory
// recursively, then try again.
parentDir := filepath.Dir(path)
if parentDir == "/" || parentDir == "." {
// We cannot create the root directory or the current directory, so
// return the original error.
return err
}
if err := MkdirAll(fileSystem, parentDir, perm); err != nil {
return err
}
return fileSystem.Mkdir(path, perm)
default:
// Some other error.
return err
}
}
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