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list.go
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list.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package golang
import (
"context"
"encoding/json"
"fmt"
"io"
"os"
"os/exec"
"strings"
"time"
"github.com/pkg/errors"
)
const listTimeout = 3 * time.Minute
// PackageInfo is the subset of data from `go list -deps -json` that's
// necessary to calculate chaincode package dependencies.
type PackageInfo struct {
ImportPath string
Dir string
GoFiles []string
Goroot bool
CFiles []string
CgoFiles []string
HFiles []string
SFiles []string
IgnoredGoFiles []string
Incomplete bool
}
func (p PackageInfo) Files() []string {
var files []string
files = append(files, p.GoFiles...)
files = append(files, p.CFiles...)
files = append(files, p.CgoFiles...)
files = append(files, p.HFiles...)
files = append(files, p.SFiles...)
files = append(files, p.IgnoredGoFiles...)
return files
}
// gopathDependencyPackageInfo extracts dependency information for
// specified package.
func gopathDependencyPackageInfo(goos, goarch, pkg string) ([]PackageInfo, error) {
ctx, cancel := context.WithTimeout(context.Background(), listTimeout)
defer cancel()
cmd := exec.CommandContext(ctx, "go", "list", "-deps", "-json", pkg)
cmd.Env = append(os.Environ(), "GOOS="+goos, "GOARCH="+goarch)
stdout, err := cmd.StdoutPipe()
if err != nil {
return nil, wrapExitErr(err, "'go list -deps' failed")
}
decoder := json.NewDecoder(stdout)
err = cmd.Start()
if err != nil {
return nil, err
}
var list []PackageInfo
for {
var packageInfo PackageInfo
err := decoder.Decode(&packageInfo)
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
if packageInfo.Incomplete {
return nil, fmt.Errorf("failed to calculate dependencies: incomplete package: %s", packageInfo.ImportPath)
}
if packageInfo.Goroot {
continue
}
list = append(list, packageInfo)
}
err = cmd.Wait()
if err != nil {
return nil, errors.Wrapf(err, "listing deps for package %s failed", pkg)
}
return list, nil
}
func wrapExitErr(err error, message string) error {
if ee, ok := err.(*exec.ExitError); ok {
return errors.Wrapf(err, message+" with: %s", strings.TrimRight(string(ee.Stderr), "\n\r\t"))
}
return errors.Wrap(err, message)
}
type ModuleInfo struct {
Dir string
GoMod string
ImportPath string
ModulePath string
}
// listModuleInfo extracts module information for the curent working directory.
func listModuleInfo(extraEnv ...string) (*ModuleInfo, error) {
ctx, cancel := context.WithTimeout(context.Background(), listTimeout)
defer cancel()
cmd := exec.CommandContext(ctx, "go", "list", "-json", ".")
cmd.Env = append(os.Environ(), "GO111MODULE=on")
cmd.Env = append(cmd.Env, extraEnv...)
output, err := cmd.Output()
if err != nil {
return nil, wrapExitErr(err, "'go list' failed")
}
var moduleData struct {
ImportPath string
Module struct {
Dir string
Path string
GoMod string
}
}
if err := json.Unmarshal(output, &moduleData); err != nil {
return nil, errors.Wrap(err, "failed to unmarshal output from 'go list'")
}
return &ModuleInfo{
Dir: moduleData.Module.Dir,
GoMod: moduleData.Module.GoMod,
ImportPath: moduleData.ImportPath,
ModulePath: moduleData.Module.Path,
}, nil
}