github.com/avfs/avfs@v0.33.1-0.20240303173310-c6ba67c33eb7/vfs/memfs/memfs_examples_test.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  //go:build avfs_setostype
    18  
    19  package memfs_test
    20  
    21  import (
    22  	"errors"
    23  	"fmt"
    24  	"io/fs"
    25  	"log"
    26  
    27  	"github.com/avfs/avfs"
    28  	"github.com/avfs/avfs/idm/memidm"
    29  	"github.com/avfs/avfs/test"
    30  	"github.com/avfs/avfs/vfs/memfs"
    31  )
    32  
    33  // ExampleNew should produce the same results independently of the host OS.
    34  func ExampleNew() {
    35  	idm := memidm.NewWithOptions(&memidm.Options{OSType: avfs.OsLinux})
    36  	vfs := memfs.NewWithOptions(&memfs.Options{Idm: idm, OSType: avfs.OsLinux})
    37  
    38  	fmt.Println(vfs.Features())
    39  	fmt.Println(vfs.User().Name())
    40  	fmt.Println(vfs.TempDir())
    41  
    42  	homeDir := avfs.HomeDirUser(vfs, vfs.User())
    43  	fmt.Println(homeDir)
    44  
    45  	_, err := vfs.Stat(homeDir)
    46  	if err == nil {
    47  		fmt.Printf("%s exists", homeDir)
    48  	}
    49  
    50  	// Features(Hardlink|IdentityMgr|SetOSType|SubFS|Symlink|SystemDirs)
    51  	// root
    52  	// /tmp
    53  	// /root
    54  	// /root exists
    55  }
    56  
    57  func ExampleNewWithOptions_noSystemDirs() {
    58  	vfs := memfs.NewWithOptions(&memfs.Options{OSType: avfs.OsLinux})
    59  	tmpDir := vfs.TempDir()
    60  
    61  	_, err := vfs.Stat(tmpDir)
    62  	if errors.Is(err, fs.ErrNotExist) {
    63  		fmt.Printf("%s does not exist", tmpDir)
    64  	}
    65  
    66  	// Output: /tmp does not exist
    67  }
    68  
    69  func ExampleNewWithOptions_noIdm() {
    70  	vfs := memfs.NewWithOptions(&memfs.Options{Idm: avfs.NotImplementedIdm, OSType: avfs.OsLinux})
    71  	fmt.Println(vfs.User().Name())
    72  
    73  	// Output: Default
    74  }
    75  
    76  func ExampleMemFS_Sub() {
    77  	idm := memidm.NewWithOptions(&memidm.Options{OSType: avfs.OsLinux})
    78  	vfsSrc := memfs.NewWithOptions(&memfs.Options{Idm: idm, OSType: avfs.OsLinux})
    79  
    80  	_, err := vfsSrc.Idm().UserAdd(test.UsrTest, "root")
    81  	if err != nil {
    82  		log.Fatalf("UserAdd : want error to be nil, got %v", err)
    83  	}
    84  
    85  	vfsSub, err := vfsSrc.Sub("/")
    86  	if err != nil {
    87  		log.Fatalf("Sub : want error to be nil, got %v", err)
    88  	}
    89  
    90  	err = vfsSub.SetUserByName(test.UsrTest)
    91  	if err != nil {
    92  		log.Fatalf("SetUser : want error to be nil, got %v", err)
    93  	}
    94  
    95  	fmt.Println(vfsSrc.User().Name())
    96  	fmt.Println(vfsSub.User().Name())
    97  
    98  	// Output:
    99  	// root
   100  	// UsrTest
   101  }
   102  
   103  func ExampleMemFS_SetUserByName() {
   104  	idm := memidm.NewWithOptions(&memidm.Options{OSType: avfs.OsLinux})
   105  	vfs := memfs.NewWithOptions(&memfs.Options{Idm: idm, OSType: avfs.OsLinux})
   106  
   107  	_, err := vfs.Idm().UserAdd(test.UsrTest, idm.AdminGroup().Name())
   108  	if err != nil {
   109  		log.Fatalf("UserAdd : want error to be nil, got %v", err)
   110  	}
   111  
   112  	fmt.Println(vfs.User().Name())
   113  
   114  	err = vfs.SetUserByName(test.UsrTest)
   115  	if err != nil {
   116  		log.Fatalf("SetUser : want error to be nil, got %v", err)
   117  	}
   118  
   119  	fmt.Println(vfs.User().Name())
   120  
   121  	// Output:
   122  	// root
   123  	// UsrTest
   124  }