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62a9628863
In the upcoming Go 1.14 release, there is an introduction of the -modfile flag which allows a user to run a go command but choose where to direct the go.mod file updates. The information about this can be found here: golang/go#34506. This change starts setting up the infrastructure to handle the seperate modfile rather than keep changing a user's go.mod file. To support versions of Go that are not 1.14, we run a modified "go list" command that checks the release tags to see if 1.14 is contained. Updates golang/go#31999 Change-Id: Icb71b6402ec4fa07e5f6f1a63954c25520e860b0 Reviewed-on: https://go-review.googlesource.com/c/tools/+/211538 Run-TryBot: Rohan Challa <rohan@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rebecca Stambler <rstambler@golang.org>
67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
// Copyright 2019 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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package cache
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import (
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"context"
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"io"
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"io/ioutil"
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"os"
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"strings"
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"golang.org/x/tools/internal/lsp/source"
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errors "golang.org/x/xerrors"
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)
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// Borrowed from (internal/imports/mod.go:620)
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// This function will return the main go.mod file for this folder if it exists and whether the -modfile
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// flag exists for this version of go.
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func modfileFlagExists(ctx context.Context, folder string, env []string) (string, bool, error) {
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const format = `{{.GoMod}}
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{{range context.ReleaseTags}}{{if eq . "go1.14"}}{{.}}{{end}}{{end}}
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`
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stdout, err := source.InvokeGo(ctx, folder, env, "list", "-m", "-f", format)
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if err != nil {
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return "", false, err
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}
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lines := strings.Split(stdout.String(), "\n")
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if len(lines) < 2 {
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return "", false, errors.Errorf("unexpected stdout: %q", stdout)
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}
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return lines[0], lines[1] == "go1.14", nil
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}
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// The function getModfiles will return the go.mod files associated with the directory that is passed in.
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func getModfiles(ctx context.Context, folder string, env []string) (*modfiles, error) {
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modfile, flagExists, err := modfileFlagExists(ctx, folder, env)
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if err != nil {
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return nil, err
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}
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if !flagExists {
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return nil, nil
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}
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if modfile == "" || modfile == os.DevNull {
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return nil, errors.Errorf("go env GOMOD cannot detect a go.mod file in this folder")
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}
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f, err := ioutil.TempFile("", "go.*.mod")
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if err != nil {
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return nil, err
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}
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defer f.Close()
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// Copy the current go.mod file into the temporary go.mod file.
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origFile, err := os.Open(modfile)
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if err != nil {
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return nil, err
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}
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defer origFile.Close()
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if _, err := io.Copy(f, origFile); err != nil {
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return nil, err
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}
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if err := f.Close(); err != nil {
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return nil, err
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}
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return &modfiles{real: modfile, temp: f.Name()}, nil
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}
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