69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This file enables an external tool to intercept package requests.
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// If the tool is present then its results are used in preference to
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// the go list command.
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package packages
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"os/exec"
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"strings"
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)
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// findExternalTool returns the file path of a tool that supplies
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// the build system package structure, or "" if not found."
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// If GOPACKAGESDRIVER is set in the environment findExternalTool returns its
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// value, otherwise it searches for a binary named gopackagesdriver on the PATH.
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func findExternalDriver(cfg *Config) driver {
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const toolPrefix = "GOPACKAGESDRIVER="
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tool := ""
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for _, env := range cfg.Env {
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if val := strings.TrimPrefix(env, toolPrefix); val != env {
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tool = val
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}
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}
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if tool != "" && tool == "off" {
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return nil
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}
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if tool == "" {
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var err error
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tool, err = exec.LookPath("gopackagesdriver")
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if err != nil {
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return nil
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}
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}
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return func(cfg *Config, words ...string) (*driverResponse, error) {
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buf := new(bytes.Buffer)
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fullargs := []string{
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"list",
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fmt.Sprintf("-test=%t", cfg.Tests),
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fmt.Sprintf("-export=%t", usesExportData(cfg)),
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fmt.Sprintf("-deps=%t", cfg.Mode >= LoadImports),
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}
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for _, f := range cfg.BuildFlags {
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fullargs = append(fullargs, fmt.Sprintf("-buildflag=%v", f))
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}
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fullargs = append(fullargs, "--")
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fullargs = append(fullargs, words...)
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cmd := exec.CommandContext(cfg.Context, tool, fullargs...)
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cmd.Env = cfg.Env
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cmd.Dir = cfg.Dir
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cmd.Stdout = buf
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cmd.Stderr = new(bytes.Buffer)
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if err := cmd.Run(); err != nil {
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return nil, fmt.Errorf("%v: %v: %s", tool, err, cmd.Stderr)
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}
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var response driverResponse
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if err := json.Unmarshal(buf.Bytes(), &response); err != nil {
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return nil, err
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}
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return &response, nil
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}
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}
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