72 lines
2.2 KiB
Go
72 lines
2.2 KiB
Go
// 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]
|
|
}
|