github.com/avfs/avfs@v0.33.1-0.20240303173310-c6ba67c33eb7/vfs/rofs/rofs_cfg.go (about)

     1  //
     2  //  Copyright 2020 The AVFS authors
     3  //
     4  //  Licensed under the Apache License, Version 2.0 (the "License");
     5  //  you may not use this file except in compliance with the License.
     6  //  You may obtain a copy of the License at
     7  //
     8  //  	http://www.apache.org/licenses/LICENSE-2.0
     9  //
    10  //  Unless required by applicable law or agreed to in writing, software
    11  //  distributed under the License is distributed on an "AS IS" BASIS,
    12  //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  //  See the License for the specific language governing permissions and
    14  //  limitations under the License.
    15  //
    16  
    17  package rofs
    18  
    19  import (
    20  	"github.com/avfs/avfs"
    21  )
    22  
    23  // New creates a new readonly file system (RoFS) from a base file system.
    24  func New(baseFS avfs.VFS) *RoFS {
    25  	vfs := &RoFS{
    26  		baseFS:            baseFS,
    27  		errOpNotPermitted: avfs.ErrOpNotPermitted,
    28  		errPermDenied:     avfs.ErrPermDenied,
    29  	}
    30  
    31  	_ = vfs.SetFeatures(baseFS.Features()&^avfs.FeatIdentityMgr | avfs.FeatReadOnly)
    32  
    33  	if baseFS.OSType() == avfs.OsWindows {
    34  		vfs.errOpNotPermitted = avfs.ErrWinNotSupported
    35  		vfs.errPermDenied = avfs.ErrWinAccessDenied
    36  	}
    37  
    38  	return vfs
    39  }
    40  
    41  // Name returns the name of the fileSystem.
    42  func (vfs *RoFS) Name() string {
    43  	return vfs.baseFS.Name()
    44  }
    45  
    46  // OSType returns the operating system type of the file system.
    47  func (vfs *RoFS) OSType() avfs.OSType {
    48  	return vfs.baseFS.OSType()
    49  }
    50  
    51  // Type returns the type of the fileSystem or Identity manager.
    52  func (*RoFS) Type() string {
    53  	return "RoFS"
    54  }