github.com/bartle-stripe/trillian@v1.2.1/testonly/paths.go (about)

     1  // Copyright 2017 Google Inc. All Rights Reserved.
     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 testonly
    16  
    17  import (
    18  	"path"
    19  	"path/filepath"
    20  	"runtime"
    21  )
    22  
    23  // RelativeToPackage returns the input path p as an absolute path, resolved relative to the caller's package.
    24  // The working directory for Go tests is the dir of the test file. Using "plain" relative paths in test
    25  // utilities is, therefore, brittle, as the directory structure may change depending on where the tests are placed.
    26  func RelativeToPackage(p string) string {
    27  	_, file, _, ok := runtime.Caller(1)
    28  	if !ok {
    29  		panic("cannot get caller information")
    30  	}
    31  
    32  	absPath, err := filepath.Abs(filepath.Join(path.Dir(file), p))
    33  	if err != nil {
    34  		panic(err)
    35  	}
    36  	return absPath
    37  }