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ef06a5f44a
go:embed disallows using symlinked files by design. crypto/elliptic is the first std package to use it as of CL 380475, and unfortunately that broke the TestRepeatBootstrap long test. The reason it uses symlinks is for speed; it wants to copy GOROOT/src, but regular files aren't going to be modified in any way, so a symlink, if supported, means not needing to copy the contents. Replace the symlink attempt with hard links, which will mean regular files remain as such, fixing go:embed. It's worth noting that on many systems hard links won't work, as the temporary filesystem tends to be separate, but it doesn't hurt to try. In my system, where /tmp is tmpfs, the test now copies more bytes. With the added Logf, I can see overlayDir goes from ~30ms to ~100ms. This makes sense, as GOROOT/src currently weighs around 100MiB. To alleviate that slow-down, stop copying testdata directories, as they currently weigh around 20MiB and aren't needed for the test. This gets overlayDir on my system down to an acceptable ~70ms. I briefly considered teaching overlayDir what files can be symlinks, but that seemed fairly complex long-term, as any file could be embedded. While here, start using testing.T.TempDir and fs.WalkDir. For #50995. Change-Id: I17947e6bdee96237e1ca0606ad0b95e7c5987bc1 Reviewed-on: https://go-review.googlesource.com/c/go/+/383995 Trust: Daniel Martí <mvdan@mvdan.cc> Trust: Bryan Mills <bcmills@google.com> Run-TryBot: Bryan Mills <bcmills@google.com> Reviewed-by: Bryan Mills <bcmills@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
55 lines
1.3 KiB
Go
55 lines
1.3 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 reboot_test verifies that the current GOROOT can be used to bootstrap
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// itself.
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package reboot_test
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import (
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"testing"
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"time"
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)
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func TestRepeatBootstrap(t *testing.T) {
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if testing.Short() {
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t.Skipf("skipping test that rebuilds the entire toolchain")
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}
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goroot := t.TempDir()
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gorootSrc := filepath.Join(goroot, "src")
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overlayStart := time.Now()
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if err := overlayDir(gorootSrc, filepath.Join(runtime.GOROOT(), "src")); err != nil {
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t.Fatal(err)
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}
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t.Logf("GOROOT/src overlay set up in %s", time.Since(overlayStart))
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if err := os.WriteFile(filepath.Join(goroot, "VERSION"), []byte(runtime.Version()), 0666); err != nil {
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t.Fatal(err)
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}
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var makeScript string
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switch runtime.GOOS {
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case "windows":
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makeScript = "make.bat"
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case "plan9":
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makeScript = "make.rc"
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default:
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makeScript = "make.bash"
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}
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cmd := exec.Command(filepath.Join(runtime.GOROOT(), "src", makeScript))
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cmd.Dir = gorootSrc
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cmd.Env = append(os.Environ(), "GOROOT=", "GOROOT_BOOTSTRAP="+runtime.GOROOT())
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cmd.Stderr = os.Stderr
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cmd.Stdout = os.Stdout
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if err := cmd.Run(); err != nil {
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t.Fatal(err)
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}
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}
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