github.com/rclone/rclone@v1.66.1-0.20240517100346-7b89735ae726/backend/union/policy/lno.go (about)

     1  package policy
     2  
     3  import (
     4  	"context"
     5  
     6  	"github.com/rclone/rclone/backend/union/upstream"
     7  	"github.com/rclone/rclone/fs"
     8  )
     9  
    10  func init() {
    11  	registerPolicy("lno", &Lno{})
    12  }
    13  
    14  // Lno stands for least number of objects
    15  // Search category: same as eplno.
    16  // Action category: same as eplno.
    17  // Create category: Pick the drive with the least number of objects.
    18  type Lno struct {
    19  	EpLno
    20  }
    21  
    22  // Create category policy, governing the creation of files and directories
    23  func (p *Lno) Create(ctx context.Context, upstreams []*upstream.Fs, path string) ([]*upstream.Fs, error) {
    24  	if len(upstreams) == 0 {
    25  		return nil, fs.ErrorObjectNotFound
    26  	}
    27  	upstreams = filterNC(upstreams)
    28  	if len(upstreams) == 0 {
    29  		return nil, fs.ErrorPermissionDenied
    30  	}
    31  	u, err := p.lno(upstreams)
    32  	return []*upstream.Fs{u}, err
    33  }