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