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cmd/go: avoid indexing modules in GOROOT

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Scanning GOROOT modules for changes appears to be causing Windows
builders to time out in x/tools tests. We may try a per-package index
instead, but for now just skip GOROOT modules (as we do for main
modules).

Fixes #53493.

Change-Id: Ic5bb90b4ce173a24fc6564e85fcde96e1f9b975f
Reviewed-on: https://go-review.googlesource.com/c/go/+/413634
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
This commit is contained in:
Bryan C. Mills 2022-06-22 15:19:54 -04:00 committed by Bryan Mills
parent 111cdb5848
commit aca37d16a5
2 changed files with 11 additions and 61 deletions
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14
src/cmd/go/go_test.go
View File

@ -18,7 +18,6 @@ import (
"io"
"io/fs"
"log"
"math/rand"
"os"
"os/exec"
"path/filepath"
@ -129,19 +128,6 @@ func TestMain(m *testing.M) {
}
os.Setenv("CMDGO_TEST_RUN_MAIN", "true")
if strings.HasPrefix(runtime.Version(), "devel ") && godebug.Get("goindexsalt") == "" {
// We're going to execute a lot of cmd/go tests, so set a consistent salt
// via GODEBUG so that the modindex package can avoid walking an entire
// GOROOT module whenever it tries to use an index for that module.
indexSalt := rand.Int63()
v := os.Getenv("GODEBUG")
if v == "" {
os.Setenv("GODEBUG", fmt.Sprintf("goindexsalt=%d", indexSalt))
} else {
os.Setenv("GODEBUG", fmt.Sprintf("%s,goindexsalt=%d", v, indexSalt))
}
}
// $GO_GCFLAGS a compiler debug flag known to cmd/dist, make.bash, etc.
// It is not a standard go command flag; use os.Getenv, not cfg.Getenv.
if os.Getenv("GO_GCFLAGS") != "" {

58
src/cmd/go/internal/modindex/read.go
View File

@ -15,7 +15,6 @@ import (
"internal/godebug"
"internal/goroot"
"internal/unsafeheader"
"io/fs"
"math"
"path"
"path/filepath"
@ -29,7 +28,6 @@ import (
"cmd/go/internal/base"
"cmd/go/internal/cache"
"cmd/go/internal/cfg"
"cmd/go/internal/fsys"
"cmd/go/internal/imports"
"cmd/go/internal/par"
"cmd/go/internal/str"
@ -55,63 +53,29 @@ var fcache par.Cache
var salt = godebug.Get("goindexsalt")
// moduleHash returns an ActionID corresponding to the state of the module
// located at filesystem path modroot.
func moduleHash(modroot string, ismodcache bool) (cache.ActionID, error) {
// We expect modules stored within the module cache to be checksummed and
// immutable, and we expect released modules within GOROOT to change only
// infrequently (when the Go version changes).
if !ismodcache && !str.HasFilePathPrefix(modroot, cfg.GOROOT) {
if !ismodcache {
// The contents of this module may change over time. We don't want to pay
// the cost to detect changes and re-index whenever they occur, so just
// don't index it at all.
//
// Note that this is true even for modules in GOROOT/src: non-release builds
// of the Go toolchain may have arbitrary development changes on top of the
// commit reported by runtime.Version, or could be completly artificial due
// to lacking a `git` binary (like "devel gomote.XXXXX", as synthesized by
// "gomote push" as of 2022-06-15). (Release builds shouldn't have
// modifications, but we don't want to use a behavior for releases that we
// haven't tested during development.)
return cache.ActionID{}, ErrNotIndexed
}
h := cache.NewHash("moduleIndex")
fmt.Fprintf(h, "module index %s %s %s %v\n", runtime.Version(), salt, indexVersion, modroot)
if str.HasFilePathPrefix(modroot, cfg.GOROOT) && strings.HasPrefix(runtime.Version(), "devel ") && salt == "" {
// This copy of the standard library is a development version, not a
// release. It could be based on a Git commit (like
// "devel go1.19-2a78e8afc0 Wed Jun 15 00:06:24 2022 +0000") with or
// without changes on top of that commit, or it could be completly
// artificial due to lacking a `git` binary (like "devel gomote.XXXXX", as
// synthesized by "gomote push" as of 2022-06-15).
//
// If the user provided a unique salt via GODEBUG, we can trust that it is
// unique and just go with it. Otherwise, we compute an inexpensive hash of
// its files using mtimes so that during development we can continue to
// exercise the logic for cached GOROOT indexes.
//
// mtimes may be granular, imprecise, and loosely updated (see
// https://apenwarr.ca/log/20181113), but we don't expect Go contributors to
// be mucking around with the import graphs in GOROOT often enough for mtime
// collisions to matter essentially ever.
//
// Note that fsys.Walk walks paths in deterministic order, so this hash
// should be completely deterministic if the files are unchanged.
err := fsys.Walk(modroot, func(path string, info fs.FileInfo, err error) error {
if err := moduleWalkErr(modroot, path, info, err); err != nil {
return err
}
if info.IsDir() {
return nil
}
fmt.Fprintf(h, "file %v %v\n", info.Name(), info.ModTime())
if info.Mode()&fs.ModeSymlink != 0 {
targ, err := fsys.Stat(path)
if err != nil {
return err
}
fmt.Fprintf(h, "target %v %v\n", targ.Name(), targ.ModTime())
}
return nil
})
if err != nil {
return cache.ActionID{}, err
}
}
return h.Sum(), nil
}