cmd/go: add modload.State parameter to AllowedFunc

This change makes the following functions methods on the State:
  * CheckAllowed
  * CheckExclusions
  * CheckRetractions

Doing so allows us to reduce the use of the global state variable in
downstream function calls.

This commit is part of the overall effort to eliminate global
modloader state.

Change-Id: I97147311d9de16ecac8c122c2b6bdde94bad9d8f
Reviewed-on: https://go-review.googlesource.com/c/go/+/711119
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Michael Matloob <matloob@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

src/cmd/go/internal/load/pkg.go

@@ -3398,7 +3398,7 @@ func PackagesAndErrorsOutsideModule(loaderstate *modload.State, ctx context.Cont
 	// (first result). It's possible this module won't provide packages named by
 	// later arguments, and other modules would. Let's not try to be too
 	// magical though.
-	allowed := modload.CheckAllowed
+	allowed := loaderstate.CheckAllowed
 	if modload.IsRevisionQuery(firstPath, version) {
 		// Don't check for retractions if a specific revision is requested.
 		allowed = nil

src/cmd/go/internal/modget/get.go

@@ -686,12 +686,12 @@ func (r *resolver) queryPattern(loaderstate *modload.State, ctx context.Context,
 func (r *resolver) checkAllowedOr(s *modload.State, requested string, selected func(string) string) modload.AllowedFunc {
 	return func(ctx context.Context, m module.Version) error {
 		if m.Version == requested {
-			return modload.CheckExclusions(ctx, m)
+			return s.CheckExclusions(ctx, m)
 		}
 		if (requested == "upgrade" || requested == "patch") && m.Version == selected(m.Path) {
 			return nil
 		}
-		return modload.CheckAllowed(ctx, m)
+		return s.CheckAllowed(ctx, m)
 	}
 }
 
@@ -1715,7 +1715,7 @@ func (r *resolver) checkPackageProblems(loaderstate *modload.State, ctx context.
 	for i := range retractions {
 		i := i
 		r.work.Add(func() {
-			err := modload.CheckRetractions(loaderstate, ctx, retractions[i].m)
+			err := loaderstate.CheckRetractions(ctx, retractions[i].m)
 			if _, ok := errors.AsType[*modload.ModuleRetractedError](err); ok {
 				retractions[i].message = err.Error()
 			}

src/cmd/go/internal/modload/build.go

@@ -128,7 +128,7 @@ func addUpdate(loaderstate *State, ctx context.Context, m *modinfo.ModulePublic)
 		return
 	}
 
-	info, err := Query(loaderstate, ctx, m.Path, "upgrade", m.Version, CheckAllowed)
+	info, err := Query(loaderstate, ctx, m.Path, "upgrade", m.Version, loaderstate.CheckAllowed)
 	if _, ok := errors.AsType[*NoMatchingVersionError](err); ok ||
 		errors.Is(err, fs.ErrNotExist) ||
 		errors.Is(err, ErrDisallowed) {
@@ -217,9 +217,9 @@ func addVersions(loaderstate *State, ctx context.Context, m *modinfo.ModulePubli
 	// Perhaps that doesn't buy us much, though: we would always have to fetch
 	// all of the version tags to list the available versions anyway.
 
-	allowed := CheckAllowed
+	allowed := loaderstate.CheckAllowed
 	if listRetracted {
-		allowed = CheckExclusions
+		allowed = loaderstate.CheckExclusions
 	}
 	v, origin, err := versions(loaderstate, ctx, m.Path, allowed)
 	if err != nil && m.Error == nil {
@@ -236,7 +236,7 @@ func addRetraction(loaderstate *State, ctx context.Context, m *modinfo.ModulePub
 		return
 	}
 
-	err := CheckRetractions(loaderstate, ctx, module.Version{Path: m.Path, Version: m.Version})
+	err := loaderstate.CheckRetractions(ctx, module.Version{Path: m.Path, Version: m.Version})
 	if err == nil {
 		return
 	} else if _, ok := errors.AsType[*NoMatchingVersionError](err); ok || errors.Is(err, fs.ErrNotExist) {

src/cmd/go/internal/modload/import.go

@@ -612,7 +612,7 @@ func queryImport(loaderstate *State, ctx context.Context, path string, rs *Requi
 		return module.Version{}, err
 	}
 
-	candidates, err := QueryPackages(loaderstate, ctx, path, "latest", mg.Selected, CheckAllowed)
+	candidates, err := QueryPackages(loaderstate, ctx, path, "latest", mg.Selected, loaderstate.CheckAllowed)
 	if err != nil {
 		if errors.Is(err, fs.ErrNotExist) {
 			// Return "cannot find module providing package […]" instead of whatever

src/cmd/go/internal/modload/list.go

@@ -192,7 +192,7 @@ func listModules(loaderstate *State, ctx context.Context, rs *Requirements, args
 				}
 			}
 
-			allowed := CheckAllowed
+			allowed := loaderstate.CheckAllowed
 			if IsRevisionQuery(path, vers) || mode&ListRetracted != 0 {
 				// Allow excluded and retracted versions if the user asked for a
 				// specific revision or used 'go list -retracted'.

src/cmd/go/internal/modload/modfile.go

@@ -138,11 +138,11 @@ func pruningForGoVersion(goVersion string) modPruning {
 // CheckAllowed returns an error equivalent to ErrDisallowed if m is excluded by
 // the main module's go.mod or retracted by its author. Most version queries use
 // this to filter out versions that should not be used.
-func CheckAllowed(ctx context.Context, m module.Version) error {
+func (s *State) CheckAllowed(ctx context.Context, m module.Version) error {
-	if err := CheckExclusions(ctx, m); err != nil {
+	if err := s.CheckExclusions(ctx, m); err != nil {
 		return err
 	}
-	if err := CheckRetractions(LoaderState, ctx, m); err != nil {
+	if err := s.CheckRetractions(ctx, m); err != nil {
 		return err
 	}
 	return nil
@@ -154,9 +154,9 @@ var ErrDisallowed = errors.New("disallowed module version")
 
 // CheckExclusions returns an error equivalent to ErrDisallowed if module m is
 // excluded by the main module's go.mod file.
-func CheckExclusions(ctx context.Context, m module.Version) error {
+func (s *State) CheckExclusions(ctx context.Context, m module.Version) error {
-	for _, mainModule := range LoaderState.MainModules.Versions() {
+	for _, mainModule := range s.MainModules.Versions() {
-		if index := LoaderState.MainModules.Index(mainModule); index != nil && index.exclude[m] {
+		if index := s.MainModules.Index(mainModule); index != nil && index.exclude[m] {
 			return module.VersionError(m, errExcluded)
 		}
 	}
@@ -172,7 +172,7 @@ func (e *excludedError) Is(err error) bool { return err == ErrDisallowed }
 
 // CheckRetractions returns an error if module m has been retracted by
 // its author.
-func CheckRetractions(loaderstate *State, ctx context.Context, m module.Version) (err error) {
+func (s *State) CheckRetractions(ctx context.Context, m module.Version) (err error) {
 	defer func() {
 		if err == nil {
 			return
@@ -193,7 +193,7 @@ func CheckRetractions(loaderstate *State, ctx context.Context, m module.Version)
 		// Cannot be retracted.
 		return nil
 	}
-	if repl := Replacement(loaderstate, module.Version{Path: m.Path}); repl.Path != "" {
+	if repl := Replacement(s, module.Version{Path: m.Path}); repl.Path != "" {
 		// All versions of the module were replaced.
 		// Don't load retractions, since we'd just load the replacement.
 		return nil
@@ -210,11 +210,11 @@ func CheckRetractions(loaderstate *State, ctx context.Context, m module.Version)
 	// We load the raw file here: the go.mod file may have a different module
 	// path that we expect if the module or its repository was renamed.
 	// We still want to apply retractions to other aliases of the module.
-	rm, err := queryLatestVersionIgnoringRetractions(loaderstate, ctx, m.Path)
+	rm, err := queryLatestVersionIgnoringRetractions(s, ctx, m.Path)
 	if err != nil {
 		return err
 	}
-	summary, err := rawGoModSummary(loaderstate, rm)
+	summary, err := rawGoModSummary(s, rm)
 	if err != nil && !errors.Is(err, gover.ErrTooNew) {
 		return err
 	}

src/cmd/go/internal/modload/mvs.go

@@ -116,7 +116,7 @@ func previousVersion(loaderstate *State, ctx context.Context, m module.Version)
 		return module.Version{Path: m.Path, Version: "none"}, nil
 	}
 
-	list, _, err := versions(loaderstate, ctx, m.Path, CheckAllowed)
+	list, _, err := versions(loaderstate, ctx, m.Path, loaderstate.CheckAllowed)
 	if err != nil {
 		if errors.Is(err, os.ErrNotExist) {
 			return module.Version{Path: m.Path, Version: "none"}, nil

src/cmd/go/internal/modload/query_test.go

@@ -168,6 +168,7 @@ func TestQuery(t *testing.T) {
 	ctx := context.Background()
 
 	for _, tt := range queryTests {
+		loaderstate := NewState()
 		allow := tt.allow
 		if allow == "" {
 			allow = "*"
@@ -182,7 +183,7 @@ func TestQuery(t *testing.T) {
 		t.Run(strings.ReplaceAll(tt.path, "/", "_")+"/"+tt.query+"/"+tt.current+"/"+allow, func(t *testing.T) {
 			t.Parallel()
 
-			info, err := Query(LoaderState, ctx, tt.path, tt.query, tt.current, allowed)
+			info, err := Query(loaderstate, ctx, tt.path, tt.query, tt.current, allowed)
 			if tt.err != "" {
 				if err == nil {
 					t.Errorf("Query(_, %q, %q, %q, %v) = %v, want error %q", tt.path, tt.query, tt.current, allow, info.Version, tt.err)

src/cmd/go/internal/toolchain/select.go

@@ -700,7 +700,7 @@ func maybeSwitchForGoInstallVersion(loaderstate *modload.State, minVers string)
 
 	// See internal/load.PackagesAndErrorsOutsideModule
 	ctx := context.Background()
-	allowed := modload.CheckAllowed
+	allowed := loaderstate.CheckAllowed
 	if modload.IsRevisionQuery(path, version) {
 		// Don't check for retractions if a specific revision is requested.
 		allowed = nil