acb2964d65
Some minor improvements, but biggest for here is ErrPipeListenerClosed is no longer an errors.New where the string matches the text of the now exported net.ErrClosed in the stdlib, but is just assigned to net.ErrClosed directly. This should allow us to get rid of the string check for "use of closed network connection" here now.. Signed-off-by: Daniel Canter <dcanter@microsoft.com>
52 lines
1.5 KiB
Go
52 lines
1.5 KiB
Go
// 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 checks the go version by running "go list" with modules off.
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// It returns the X in Go 1.X.
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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]"
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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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