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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gocommand
import (
"context"
"fmt"
"regexp"
"strings"
)
// GoVersion reports the minor version number of the highest release
// tag built into the go command on the PATH.
//
// Note that this may be higher than the version of the go tool used
// to build this application, and thus the versions of the standard
// go/{scanner,parser,ast,types} packages that are linked into it.
// In that case, callers should either downgrade to the version of
// go used to build the application, or report an error that the
// application is too old to use the go command on the PATH.
func GoVersion(ctx context.Context, inv Invocation, r *Runner) (int, error) {
inv.Verb = "list"
inv.Args = []string{"-e", "-f", `{{context.ReleaseTags}}`, `--`, `unsafe`}
inv.BuildFlags = nil // This is not a build command.
inv.ModFlag = ""
inv.ModFile = ""
inv.Env = append(inv.Env[:len(inv.Env):len(inv.Env)], "GO111MODULE=off")
stdoutBytes, err := r.Run(ctx, inv)
if err != nil {
return 0, err
}
stdout := stdoutBytes.String()
if len(stdout) < 3 {
return 0, fmt.Errorf("bad ReleaseTags output: %q", stdout)
}
// Split up "[go1.1 go1.15]" and return highest go1.X value.
tags := strings.Fields(stdout[1 : len(stdout)-2])
for i := len(tags) - 1; i >= 0; i-- {
var version int
if _, err := fmt.Sscanf(tags[i], "go1.%d", &version); err != nil {
continue
}
return version, nil
}
return 0, fmt.Errorf("no parseable ReleaseTags in %v", tags)
}
// GoVersionOutput returns the complete output of the go version command.
func GoVersionOutput(ctx context.Context, inv Invocation, r *Runner) (string, error) {
inv.Verb = "version"
goVersion, err := r.Run(ctx, inv)
if err != nil {
return "", err
}
return goVersion.String(), nil
}
// ParseGoVersionOutput extracts the Go version string
// from the output of the "go version" command.
// Given an unrecognized form, it returns an empty string.
func ParseGoVersionOutput(data string) string {
re := regexp.MustCompile(`^go version (go\S+|devel \S+)`)
m := re.FindStringSubmatch(data)
if len(m) != 2 {
return "" // unrecognized version
}
return m[1]
}
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