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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package testutil
import (
"fmt"
"os"
"path/filepath"
)
// FindFile searchs for a file inside the test run environment. It returns the
// full path to the file. It fails if none or more than one file is found.
func FindFile(path string) (string, error) {
wd, err := os.Getwd()
if err != nil {
return "", err
}
// The test root is demarcated by a path element called "__main__". Search for
// it backwards from the working directory.
root := wd
for {
dir, name := filepath.Split(root)
if name == "__main__" {
break
}
if len(dir) == 0 {
return "", fmt.Errorf("directory __main__ not found in %q", wd)
}
// Remove ending slash to loop around.
root = dir[:len(dir)-1]
}
// Annoyingly, bazel adds the build type to the directory path for go
// binaries, but not for c++ binaries. We use two different patterns to
// to find our file.
patterns := []string{
// Try the obvious path first.
filepath.Join(root, path),
// If it was a go binary, use a wildcard to match the build
// type. The pattern is: /test-path/__main__/directories/*/file.
filepath.Join(root, filepath.Dir(path), "*", filepath.Base(path)),
}
for _, p := range patterns {
matches, err := filepath.Glob(p)
if err != nil {
// "The only possible returned error is ErrBadPattern,
// when pattern is malformed." -godoc
return "", fmt.Errorf("error globbing %q: %v", p, err)
}
switch len(matches) {
case 0:
// Try the next pattern.
case 1:
// We found it.
return matches[0], nil
default:
return "", fmt.Errorf("more than one match found for %q: %s", path, matches)
}
}
return "", fmt.Errorf("file %q not found", path)
}
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