cmd/go: revert 3 CLs affecting par.Work, context propagation, tracing

This reverts the following changes:

•	cmd/go: add tracing for querying and downloading from the proxy
	CL 242786, commit 1a3558341860357c2400e37773e5076bb3a51628

•	cmd/go: do context propagation for tracing downloads
	CL 248327, commit c0cf190d226cc3defb71d17c01d0b45bf49a8a85

•	cmd/go/internal: remove some users of par.Work
	CL 248326, commit f30044a03bc7cf107dbec03c02fb6d0072878252

Reason for revert: broke linux 386 and amd64 longtest builders.

The problem started with CL 248326, but CL 248327 and CL 242786
are reverted as well due to conflicts.

Updates #38714.
Fixes #40861.

Change-Id: I68496b4e5a27e47a42183553c3a645b288edac83
Reviewed-on: https://go-review.googlesource.com/c/go/+/249017
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

1 files changed, 8 insertions, 9 deletions

diff --git a/src/cmd/go/internal/modload/build.go b/src/cmd/go/internal/modload/build.go
index a101681a1f..5f8a2e7e05 100644
--- a/src/cmd/go/internal/modload/build.go
+++ b/src/cmd/go/internal/modload/build.go
@@ -6,7 +6,6 @@ package modload
 
 import (
 	"bytes"
-	"context"
 	"encoding/hex"
 	"fmt"
 	"internal/goroot"
@@ -58,21 +57,21 @@ func PackageModuleInfo(pkgpath string) *modinfo.ModulePublic {
 	if !ok {
 		return nil
 	}
-	return moduleInfo(context.TODO(), m, true)
+	return moduleInfo(m, true)
 }
 
-func ModuleInfo(ctx context.Context, path string) *modinfo.ModulePublic {
+func ModuleInfo(path string) *modinfo.ModulePublic {
 	if !Enabled() {
 		return nil
 	}
 
 	if i := strings.Index(path, "@"); i >= 0 {
-		return moduleInfo(ctx, module.Version{Path: path[:i], Version: path[i+1:]}, false)
+		return moduleInfo(module.Version{Path: path[:i], Version: path[i+1:]}, false)
 	}
 
 	for _, m := range BuildList() {
 		if m.Path == path {
-			return moduleInfo(ctx, m, true)
+			return moduleInfo(m, true)
 		}
 	}
 
@@ -85,12 +84,12 @@ func ModuleInfo(ctx context.Context, path string) *modinfo.ModulePublic {
 }
 
 // addUpdate fills in m.Update if an updated version is available.
-func addUpdate(ctx context.Context, m *modinfo.ModulePublic) {
+func addUpdate(m *modinfo.ModulePublic) {
 	if m.Version == "" {
 		return
 	}
 
-	if info, err := Query(ctx, m.Path, "upgrade", m.Version, Allowed); err == nil && semver.Compare(info.Version, m.Version) > 0 {
+	if info, err := Query(m.Path, "upgrade", m.Version, Allowed); err == nil && semver.Compare(info.Version, m.Version) > 0 {
 		m.Update = &modinfo.ModulePublic{
 			Path:    m.Path,
 			Version: info.Version,
@@ -104,7 +103,7 @@ func addVersions(m *modinfo.ModulePublic) {
 	m.Versions, _ = versions(m.Path)
 }
 
-func moduleInfo(ctx context.Context, m module.Version, fromBuildList bool) *modinfo.ModulePublic {
+func moduleInfo(m module.Version, fromBuildList bool) *modinfo.ModulePublic {
 	if m == Target {
 		info := &modinfo.ModulePublic{
 			Path:    m.Path,
@@ -133,7 +132,7 @@ func moduleInfo(ctx context.Context, m module.Version, fromBuildList bool) *modi
 	// completeFromModCache fills in the extra fields in m using the module cache.
 	completeFromModCache := func(m *modinfo.ModulePublic) {
 		if m.Version != "" {
-			if q, err := Query(ctx, m.Path, m.Version, "", nil); err != nil {
+			if q, err := Query(m.Path, m.Version, "", nil); err != nil {
 				m.Error = &modinfo.ModuleError{Err: err.Error()}
 			} else {
 				m.Version = q.Version