go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/common/data/caching/cache/hardlink_darwin_test.go (about)

     1  // Copyright 2022 The LUCI Authors.
     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 cache
    16  
    17  import (
    18  	"bytes"
    19  	"os"
    20  	"path/filepath"
    21  	"testing"
    22  )
    23  
    24  func TestMakeHardLinkOrClone(t *testing.T) {
    25  	dir := t.TempDir()
    26  	src := filepath.Join(dir, "a")
    27  	dst := filepath.Join(dir, "b")
    28  	if err := os.WriteFile(src, []byte("test"), 0o666); err != nil {
    29  		t.Fatalf("failed to create file: %v", err)
    30  	}
    31  
    32  	if err := makeHardLinkOrClone(src, dst); err != nil {
    33  		t.Fatalf("failed to create hardlink")
    34  	}
    35  
    36  	buf, err := os.ReadFile(dst)
    37  	if err != nil {
    38  		t.Fatalf("file is not cloned correctly: %v", err)
    39  	}
    40  	if want := []byte("test"); !bytes.Equal(buf, want) {
    41  		t.Fatalf("hardlinked or cloned file doesn't have expected content: want: %q, got: %q", want, buf)
    42  	}
    43  }