gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/tools/nogo/check/build.go (about)

     1  // Copyright 2019 The gVisor 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 check
    16  
    17  import (
    18  	"errors"
    19  	"fmt"
    20  	"go/build"
    21  	"io"
    22  	"os"
    23  
    24  	"gvisor.dev/gvisor/tools/nogo/flags"
    25  )
    26  
    27  // findStdPkg needs to find the bundled standard library packages.
    28  var findStdPkg = func(path string) (io.ReadCloser, error) {
    29  	if path == "C" {
    30  		// Cgo builds cannot be analyzed. Skip.
    31  		return nil, ErrSkip
    32  	}
    33  
    34  	// Attempt to use the root, if available.
    35  	root, envErr := flags.Env("GOROOT")
    36  	if envErr != nil {
    37  		return nil, fmt.Errorf("unable to resolve GOROOT: %w", envErr)
    38  	}
    39  
    40  	// Attempt to resolve the library, and propagate this error.
    41  	f, err := os.Open(fmt.Sprintf("%s/pkg/%s_%s/%s.a", root, flags.GOOS, flags.GOARCH, path))
    42  	if err != nil && errors.Is(err, os.ErrNotExist) {
    43  		return nil, ErrSkip
    44  	}
    45  	return f, err
    46  }
    47  
    48  // releaseTags returns the default release tags.
    49  var releaseTags = func() ([]string, error) {
    50  	return build.Default.ReleaseTags, nil
    51  }