59 lines
1.9 KiB
Go
59 lines
1.9 KiB
Go
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// Copyright 2020 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 gocommand
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import (
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"context"
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"fmt"
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"strings"
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)
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// GoVersion reports the minor version number of the highest release
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// tag built into the go command on the PATH.
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//
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// Note that this may be higher than the version of the go tool used
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// to build this application, and thus the versions of the standard
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// go/{scanner,parser,ast,types} packages that are linked into it.
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// In that case, callers should either downgrade to the version of
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// go used to build the application, or report an error that the
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// application is too old to use the go command on the PATH.
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func GoVersion(ctx context.Context, inv Invocation, r *Runner) (int, error) {
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inv.Verb = "list"
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inv.Args = []string{"-e", "-f", `{{context.ReleaseTags}}`, `--`, `unsafe`}
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inv.Env = append(append([]string{}, inv.Env...), "GO111MODULE=off")
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// Unset any unneeded flags, and remove them from BuildFlags, if they're
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// present.
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inv.ModFile = ""
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inv.ModFlag = ""
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var buildFlags []string
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for _, flag := range inv.BuildFlags {
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// Flags can be prefixed by one or two dashes.
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f := strings.TrimPrefix(strings.TrimPrefix(flag, "-"), "-")
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if strings.HasPrefix(f, "mod=") || strings.HasPrefix(f, "modfile=") {
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continue
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}
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buildFlags = append(buildFlags, flag)
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}
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inv.BuildFlags = buildFlags
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stdoutBytes, err := r.Run(ctx, inv)
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if err != nil {
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return 0, err
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}
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stdout := stdoutBytes.String()
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if len(stdout) < 3 {
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return 0, fmt.Errorf("bad ReleaseTags output: %q", stdout)
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}
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// Split up "[go1.1 go1.15]" and return highest go1.X value.
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tags := strings.Fields(stdout[1 : len(stdout)-2])
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for i := len(tags) - 1; i >= 0; i-- {
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var version int
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if _, err := fmt.Sscanf(tags[i], "go1.%d", &version); err != nil {
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continue
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}
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return version, nil
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}
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return 0, fmt.Errorf("no parseable ReleaseTags in %v", tags)
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}
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