github.com/google/osv-scalibr@v0.4.1/testing/fakefs/symlink_fs.go (about)

     1  // Copyright 2025 Google LLC
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package fakefs
    16  
    17  import (
    18  	"errors"
    19  
    20  	scalibrfs "github.com/google/osv-scalibr/fs"
    21  )
    22  
    23  // MockEvalSymlinksFS is a mock implementation of image.EvalSymlinksFS for testing.
    24  type MockEvalSymlinksFS struct {
    25  	scalibrfs.FS
    26  
    27  	Symlinks map[string]string
    28  }
    29  
    30  // NewMockEvalSymlinksFS creates a new MockEvalSymlinksFS.
    31  func NewMockEvalSymlinksFS(fs scalibrfs.FS, symlinks map[string]string) *MockEvalSymlinksFS {
    32  	return &MockEvalSymlinksFS{
    33  		FS:       fs,
    34  		Symlinks: symlinks,
    35  	}
    36  }
    37  
    38  // EvalSymlink mocks the evaluation of symlinks.
    39  func (fs *MockEvalSymlinksFS) EvalSymlink(name string) (string, error) {
    40  	if dest, ok := fs.Symlinks[name]; ok {
    41  		return dest, nil
    42  	}
    43  	return "", errors.New("not a symlink")
    44  }
    45  
    46  // The following should be true, but can't be uncommented because it would cause an import cycle
    47  // (image_test.go is in the package image, rather than image_test because it uses the private chainLayer field.)
    48  // var _ image.EvalSymlinksFS = &MockEvalSymlinksFS{}