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, 4 insertions, 5 deletions

diff --git a/src/cmd/go/internal/modload/import.go b/src/cmd/go/internal/modload/import.go
index 5c51a79124..4d2bc805e2 100644
--- a/src/cmd/go/internal/modload/import.go
+++ b/src/cmd/go/internal/modload/import.go
@@ -5,7 +5,6 @@
 package modload
 
 import (
-	"context"
 	"errors"
 	"fmt"
 	"go/build"
@@ -111,7 +110,7 @@ var _ load.ImportPathError = &AmbiguousImportError{}
 // Import returns an ImportMissingError as the error.
 // If Import can identify a module that could be added to supply the package,
 // the ImportMissingError records that module.
-func Import(ctx context.Context, path string) (m module.Version, dir string, err error) {
+func Import(path string) (m module.Version, dir string, err error) {
 	if strings.Contains(path, "@") {
 		return module.Version{}, "", fmt.Errorf("import path should not have @version")
 	}
@@ -166,7 +165,7 @@ func Import(ctx context.Context, path string) (m module.Version, dir string, err
 			// Avoid possibly downloading irrelevant modules.
 			continue
 		}
-		root, isLocal, err := fetch(ctx, m)
+		root, isLocal, err := fetch(m)
 		if err != nil {
 			// Report fetch error.
 			// Note that we don't know for sure this module is necessary,
@@ -249,7 +248,7 @@ func Import(ctx context.Context, path string) (m module.Version, dir string, err
 			return len(mods[i].Path) > len(mods[j].Path)
 		})
 		for _, m := range mods {
-			root, isLocal, err := fetch(ctx, m)
+			root, isLocal, err := fetch(m)
 			if err != nil {
 				// Report fetch error as above.
 				return module.Version{}, "", err
@@ -286,7 +285,7 @@ func Import(ctx context.Context, path string) (m module.Version, dir string, err
 
 	fmt.Fprintf(os.Stderr, "go: finding module for package %s\n", path)
 
-	candidates, err := QueryPackage(ctx, path, "latest", Allowed)
+	candidates, err := QueryPackage(path, "latest", Allowed)
 	if err != nil {
 		if errors.Is(err, os.ErrNotExist) {
 			// Return "cannot find module providing package […]" instead of whatever