vendor/golang_org/x: move to internal/x

Packages in vendor/ directories have a "vendor/" path prefix in GOPATH
mode, but intentionally do not in module mode. Since the import path
is embedded in the compiled output, changing that path invalidates
cache entries and causes cmd/go to try to rebuild (and reinstall) the
vendored libraries, which will fail if the directory containing those
libraries is read-only.

If I understood correctly, this is the approach Russ suggested as an
alternative to https://golang.org/cl/136138.

Fixes #27285
Fixes #26988

Change-Id: I8a2507fa892b84cde0a803aaa79e460723da572b
Reviewed-on: https://go-review.googlesource.com/c/147443
Run-TryBot: Bryan C. Mills <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Russ Cox <[email protected]>

src/cmd/api/goapi.go

@@ -442,13 +442,8 @@ func (w *Walker) Import(name string) (*types.Package, error) {
 	}
 	w.imported[name] = &importing
 
-	root := w.root
-	if strings.HasPrefix(name, "golang_org/x/") {
-		root = filepath.Join(root, "vendor")
-	}
-
 	// Determine package files.
-	dir := filepath.Join(root, filepath.FromSlash(name))
+	dir := filepath.Join(w.root, filepath.FromSlash(name))
 	if fi, err := os.Stat(dir); err != nil || !fi.IsDir() {
 		log.Fatalf("no source in tree for import %q: %v", name, err)
 	}

src/cmd/go/go_test.go

@@ -1207,22 +1207,6 @@ func TestImportCycle(t *testing.T) {
 	tg.run("list", "-e", "-json", "selfimport")
 }
 
-func TestListImportMap(t *testing.T) {
-	skipIfGccgo(t, "gccgo does not have standard packages")
-	tg := testgo(t)
-	defer tg.cleanup()
-	tg.parallel()
-	tg.run("list", "-f", "{{.ImportPath}}: {{.ImportMap}}", "net", "fmt")
-	tg.grepStdout(`^net: map\[(.* )?golang_org/x/net/dns/dnsmessage:vendor/golang_org/x/net/dns/dnsmessage.*\]`, "net/http should have rewritten dnsmessage import")
-	tg.grepStdout(`^fmt: map\[\]`, "fmt should have no rewritten imports")
-	tg.run("list", "-deps", "-test", "-f", "{{.ImportPath}} MAP: {{.ImportMap}}\n{{.ImportPath}} IMPORT: {{.Imports}}", "fmt")
-	tg.grepStdout(`^flag \[fmt\.test\] MAP: map\[fmt:fmt \[fmt\.test\]\]`, "flag [fmt.test] should import fmt [fmt.test] as fmt")
-	tg.grepStdout(`^fmt\.test MAP: map\[(.* )?testing:testing \[fmt\.test\]`, "fmt.test should import testing [fmt.test] as testing")
-	tg.grepStdout(`^fmt\.test MAP: map\[(.* )?testing:testing \[fmt\.test\]`, "fmt.test should import testing [fmt.test] as testing")
-	tg.grepStdoutNot(`^fmt\.test MAP: map\[(.* )?os:`, "fmt.test should not import a modified os")
-	tg.grepStdout(`^fmt\.test IMPORT: \[fmt \[fmt\.test\] fmt_test \[fmt\.test\] os testing \[fmt\.test\] testing/internal/testdeps \[fmt\.test\]\]`, "wrong imports for fmt.test")
-}
-
 // cmd/go: custom import path checking should not apply to Go packages without import comment.
 func TestIssue10952(t *testing.T) {
 	testenv.MustHaveExternalNetwork(t)

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

@@ -1051,20 +1051,6 @@ func disallowVendor(srcDir string, importer *Package, importerPath, path string,
 		return p
 	}
 
-	// Modules must not import vendor packages in the standard library,
-	// but the usual vendor visibility check will not catch them
-	// because the module loader presents them with an ImportPath starting
-	// with "golang_org/" instead of "vendor/".
-	if p.Standard && !importer.Standard && strings.HasPrefix(p.ImportPath, "golang_org") {
-		perr := *p
-		perr.Error = &PackageError{
-			ImportStack: stk.Copy(),
-			Err:         "use of vendored package " + path + " not allowed",
-		}
-		perr.Incomplete = true
-		return &perr
-	}
-
 	if perr := disallowVendorVisibility(srcDir, p, stk); perr != p {
 		return perr
 	}

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

@@ -58,9 +58,6 @@ func Import(path string) (m module.Version, dir string, err error) {
 
 	// Is the package in the standard library?
 	if search.IsStandardImportPath(path) {
-		if strings.HasPrefix(path, "golang_org/") {
-			return module.Version{}, filepath.Join(cfg.GOROOT, "src/vendor", path), nil
-		}
 		if goroot.IsStandardPackage(cfg.GOROOT, cfg.BuildContext.Compiler, path) {
 			dir := filepath.Join(cfg.GOROOT, "src", path)
 			return module.Version{}, dir, nil

src/cmd/go/testdata/script/list_importmap.txt

@@ -0,0 +1,25 @@
+# gccgo does not have standard packages.
+[gccgo] skip
+
+# fmt should have no rewritten imports.
+# The import from a/b should map c/d to a's vendor directory.
+go list -f '{{.ImportPath}}: {{.ImportMap}}' fmt a/b
+stdout 'fmt: map\[\]'
+stdout 'a/b: map\[c/d:a/vendor/c/d\]'
+
+# flag [fmt.test] should import fmt [fmt.test] as fmt
+# fmt.test should import testing [fmt.test] as testing
+# fmt.test should not import a modified os
+go list -deps -test -f '{{.ImportPath}} MAP: {{.ImportMap}}{{"\n"}}{{.ImportPath}} IMPORT: {{.Imports}}' fmt
+stdout '^flag \[fmt\.test\] MAP: map\[fmt:fmt \[fmt\.test\]\]'
+stdout '^fmt\.test MAP: map\[(.* )?testing:testing \[fmt\.test\]'
+! stdout '^fmt\.test MAP: map\[(.* )?os:'
+stdout '^fmt\.test IMPORT: \[fmt \[fmt\.test\] fmt_test \[fmt\.test\] os testing \[fmt\.test\] testing/internal/testdeps \[fmt\.test\]\]'
+
+
+-- a/b/b.go --
+package b
+
+import _ "c/d"
+-- a/vendor/c/d/d.go --
+package d

src/cmd/go/testdata/script/list_std.txt

@@ -8,5 +8,5 @@ go list -f '{{if not .Standard}}{{.ImportPath}}{{end}}' ./...
 
 # our vendored packages should be reported as standard
 go list std cmd
-stdout golang_org/x/net/http2/hpack
+stdout internal/x/net/http2/hpack
 stdout cmd/vendor/golang\.org/x/arch/x86/x86asm

src/cmd/go/testdata/script/mod_internal.txt

@@ -18,15 +18,6 @@ stderr 'use of internal package golang.org/x/.* not allowed'
 ! go build ./fromstd
 stderr 'use of internal package internal/testenv not allowed'
 
-# Packages found via standard-library vendoring should not leak.
-! go build ./fromstdvendor
-stderr 'use of vendored package golang_org/x/net/http/httpguts not allowed'
-
-env GO111MODULE=off
-! go build ./fromstdvendor
-stderr 'cannot find package "golang_org/x/net/http/httpguts" in any of:'
-env GO111MODULE=on
-
 # Dependencies should be able to use their own internal modules...
 rm go.mod
 go mod init golang.org/notx
@@ -83,10 +74,6 @@ import _ "golang.org/notx/useinternal"
 package fromstd
 import _ "internal/testenv"
 
--- fromstdvendor/useinternal.go --
-package fromstdvendor
-import _ "golang_org/x/net/http/httpguts"
-
 -- replace/golang.org/notx/internal/go.mod --
 module golang.org/x/internal
 

src/cmd/go/testdata/script/mod_std_vendor.txt

@@ -4,7 +4,7 @@ go list -f '{{.TestImports}}'
 stdout net/http # from .TestImports
 
 go list -test -f '{{.Deps}}'
-stdout golang_org/x/crypto # dep of .TestImports
+stdout internal/x/crypto # dep of .TestImports
 
 -- go.mod --
 module m

src/crypto/tls/cipher_suites.go

@@ -14,8 +14,8 @@ import (
 	"crypto/sha1"
 	"crypto/sha256"
 	"crypto/x509"
-	"golang_org/x/crypto/chacha20poly1305"
 	"hash"
+	"internal/x/crypto/chacha20poly1305"
 )
 
 // a keyAgreement implements the client and server side of a TLS key agreement

src/crypto/tls/handshake_messages.go

@@ -6,7 +6,7 @@ package tls
 
 import (
 	"fmt"
-	"golang_org/x/crypto/cryptobyte"
+	"internal/x/crypto/cryptobyte"
 	"strings"
 )
 

src/crypto/tls/key_schedule.go

@@ -8,10 +8,10 @@ import (
 	"crypto/elliptic"
 	"crypto/hmac"
 	"errors"
-	"golang_org/x/crypto/cryptobyte"
-	"golang_org/x/crypto/curve25519"
-	"golang_org/x/crypto/hkdf"
 	"hash"
+	"internal/x/crypto/cryptobyte"
+	"internal/x/crypto/curve25519"
+	"internal/x/crypto/hkdf"
 	"io"
 	"math/big"
 )

src/crypto/tls/ticket.go

@@ -12,7 +12,7 @@ import (
 	"crypto/sha256"
 	"crypto/subtle"
 	"errors"
-	"golang_org/x/crypto/cryptobyte"
+	"internal/x/crypto/cryptobyte"
 	"io"
 )
 

src/crypto/x509/x509.go

@@ -24,8 +24,8 @@ import (
 	"encoding/pem"
 	"errors"
 	"fmt"
-	"golang_org/x/crypto/cryptobyte"
-	cryptobyte_asn1 "golang_org/x/crypto/cryptobyte/asn1"
+	"internal/x/crypto/cryptobyte"
+	cryptobyte_asn1 "internal/x/crypto/cryptobyte/asn1"
 	"io"
 	"math/big"
 	"net"

src/go/build/build_test.go

@@ -351,12 +351,16 @@ func TestImportDirNotExist(t *testing.T) {
 func TestImportVendor(t *testing.T) {
 	testenv.MustHaveGoBuild(t) // really must just have source
 	ctxt := Default
-	ctxt.GOPATH = ""
-	p, err := ctxt.Import("golang_org/x/net/http2/hpack", filepath.Join(ctxt.GOROOT, "src/net/http"), 0)
+	wd, err := os.Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctxt.GOPATH = filepath.Join(wd, "testdata/withvendor")
+	p, err := ctxt.Import("c/d", filepath.Join(ctxt.GOPATH, "src/a/b"), 0)
 	if err != nil {
-		t.Fatalf("cannot find vendored golang_org/x/net/http2/hpack from net/http directory: %v", err)
+		t.Fatalf("cannot find vendored c/d from testdata src/a/b directory: %v", err)
 	}
-	want := "vendor/golang_org/x/net/http2/hpack"
+	want := "a/vendor/c/d"
 	if p.ImportPath != want {
 		t.Fatalf("Import succeeded but found %q, want %q", p.ImportPath, want)
 	}
@@ -365,8 +369,12 @@ func TestImportVendor(t *testing.T) {
 func TestImportVendorFailure(t *testing.T) {
 	testenv.MustHaveGoBuild(t) // really must just have source
 	ctxt := Default
-	ctxt.GOPATH = ""
-	p, err := ctxt.Import("x.com/y/z", filepath.Join(ctxt.GOROOT, "src/net/http"), 0)
+	wd, err := os.Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctxt.GOPATH = filepath.Join(wd, "testdata/withvendor")
+	p, err := ctxt.Import("x.com/y/z", filepath.Join(ctxt.GOPATH, "src/a/b"), 0)
 	if err == nil {
 		t.Fatalf("found made-up package x.com/y/z in %s", p.Dir)
 	}
@@ -380,9 +388,13 @@ func TestImportVendorFailure(t *testing.T) {
 func TestImportVendorParentFailure(t *testing.T) {
 	testenv.MustHaveGoBuild(t) // really must just have source
 	ctxt := Default
-	ctxt.GOPATH = ""
-	// This import should fail because the vendor/golang.org/x/net/http2 directory has no source code.
-	p, err := ctxt.Import("golang_org/x/net/http2", filepath.Join(ctxt.GOROOT, "src/net/http"), 0)
+	wd, err := os.Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctxt.GOPATH = filepath.Join(wd, "testdata/withvendor")
+	// This import should fail because the vendor/c directory has no source code.
+	p, err := ctxt.Import("c", filepath.Join(ctxt.GOPATH, "src/a/b"), 0)
 	if err == nil {
 		t.Fatalf("found empty parent in %s", p.Dir)
 	}

src/go/build/deps_test.go

@@ -320,7 +320,7 @@ var pkgDeps = map[string][]string{
 		"context", "math/rand", "os", "reflect", "sort", "syscall", "time",
 		"internal/nettrace", "internal/poll", "internal/syscall/unix",
 		"internal/syscall/windows", "internal/singleflight", "internal/race",
-		"golang_org/x/net/dns/dnsmessage", "golang_org/x/net/lif", "golang_org/x/net/route",
+		"internal/x/net/dns/dnsmessage", "internal/x/net/lif", "internal/x/net/route",
 	},
 
 	// NET enables use of basic network-related packages.
@@ -357,9 +357,9 @@ var pkgDeps = map[string][]string{
 		"crypto/sha1",
 		"crypto/sha256",
 		"crypto/sha512",
-		"golang_org/x/crypto/chacha20poly1305",
-		"golang_org/x/crypto/curve25519",
-		"golang_org/x/crypto/poly1305",
+		"internal/x/crypto/chacha20poly1305",
+		"internal/x/crypto/curve25519",
+		"internal/x/crypto/poly1305",
 	},
 
 	// Random byte, number generation.
@@ -387,13 +387,13 @@ var pkgDeps = map[string][]string{
 
 	// SSL/TLS.
 	"crypto/tls": {
-		"L4", "CRYPTO-MATH", "OS", "golang_org/x/crypto/cryptobyte", "golang_org/x/crypto/hkdf",
+		"L4", "CRYPTO-MATH", "OS", "internal/x/crypto/cryptobyte", "internal/x/crypto/hkdf",
 		"container/list", "crypto/x509", "encoding/pem", "net", "syscall",
 	},
 	"crypto/x509": {
 		"L4", "CRYPTO-MATH", "OS", "CGO",
 		"crypto/x509/pkix", "encoding/pem", "encoding/hex", "net", "os/user", "syscall", "net/url",
-		"golang_org/x/crypto/cryptobyte", "golang_org/x/crypto/cryptobyte/asn1",
+		"internal/x/crypto/cryptobyte", "internal/x/crypto/cryptobyte/asn1",
 	},
 	"crypto/x509/pkix": {"L4", "CRYPTO-MATH", "encoding/hex"},
 
@@ -409,12 +409,12 @@ var pkgDeps = map[string][]string{
 		"context",
 		"crypto/rand",
 		"crypto/tls",
-		"golang_org/x/net/http/httpguts",
-		"golang_org/x/net/http/httpproxy",
-		"golang_org/x/net/http2/hpack",
-		"golang_org/x/net/idna",
-		"golang_org/x/text/unicode/norm",
-		"golang_org/x/text/width",
+		"internal/x/net/http/httpguts",
+		"internal/x/net/http/httpproxy",
+		"internal/x/net/http2/hpack",
+		"internal/x/net/idna",
+		"internal/x/text/unicode/norm",
+		"internal/x/text/width",
 		"internal/nettrace",
 		"mime/multipart",
 		"net/http/httptrace",
@@ -432,9 +432,9 @@ var pkgDeps = map[string][]string{
 	"net/http/fcgi":      {"L4", "NET", "OS", "context", "net/http", "net/http/cgi"},
 	"net/http/httptest": {
 		"L4", "NET", "OS", "crypto/tls", "flag", "net/http", "net/http/internal", "crypto/x509",
-		"golang_org/x/net/http/httpguts",
+		"internal/x/net/http/httpguts",
 	},
-	"net/http/httputil": {"L4", "NET", "OS", "context", "net/http", "net/http/internal", "golang_org/x/net/http/httpguts"},
+	"net/http/httputil": {"L4", "NET", "OS", "context", "net/http", "net/http/internal", "internal/x/net/http/httpguts"},
 	"net/http/pprof":    {"L4", "OS", "html/template", "net/http", "runtime/pprof", "runtime/trace"},
 	"net/rpc":           {"L4", "NET", "encoding/gob", "html/template", "net/http"},
 	"net/rpc/jsonrpc":   {"L4", "NET", "encoding/json", "net/rpc"},
@@ -485,7 +485,7 @@ func listStdPkgs(goroot string) ([]string, error) {
 		}
 
 		name := filepath.ToSlash(path[len(src):])
-		if name == "builtin" || name == "cmd" || strings.Contains(name, "golang_org") {
+		if name == "builtin" || name == "cmd" || strings.Contains(name, "internal/x/") {
 			return filepath.SkipDir
 		}
 

src/go/build/testdata/withvendor/src/a/b/b.go

@@ -0,0 +1,3 @@
+package b
+
+import _ "c/d"

src/go/build/testdata/withvendor/src/a/vendor/c/d/d.go

@@ -0,0 +1 @@
+package d

src/go/internal/srcimporter/srcimporter_test.go

@@ -99,7 +99,7 @@ var importedObjectTests = []struct {
 	{"math.Pi", "const Pi untyped float"},
 	{"math.Sin", "func Sin(x float64) float64"},
 	{"math/big.Int", "type Int struct{neg bool; abs nat}"},
-	{"golang_org/x/text/unicode/norm.MaxSegmentSize", "const MaxSegmentSize untyped int"},
+	{"internal/x/text/unicode/norm.MaxSegmentSize", "const MaxSegmentSize untyped int"},
 }
 
 func TestImportedTypes(t *testing.T) {

src/vendor/golang_org/x/crypto/chacha20poly1305/chacha20poly1305.go → src/internal/x/crypto/chacha20poly1305/chacha20poly1305.go

@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // Package chacha20poly1305 implements the ChaCha20-Poly1305 AEAD as specified in RFC 7539.
-package chacha20poly1305 // import "golang.org/x/crypto/chacha20poly1305"
+package chacha20poly1305
 
 import (
 	"crypto/cipher"

src/vendor/golang_org/x/crypto/chacha20poly1305/chacha20poly1305_generic.go → src/internal/x/crypto/chacha20poly1305/chacha20poly1305_generic.go

@@ -7,8 +7,8 @@ package chacha20poly1305
 import (
 	"encoding/binary"
 
-	"golang_org/x/crypto/internal/chacha20"
-	"golang_org/x/crypto/poly1305"
+	"internal/x/crypto/internal/chacha20"
+	"internal/x/crypto/poly1305"
 )
 
 func roundTo16(n int) int {

src/vendor/golang_org/x/crypto/cryptobyte/asn1.go → src/internal/x/crypto/cryptobyte/asn1.go

@@ -11,7 +11,7 @@ import (
 	"reflect"
 	"time"
 
-	"golang_org/x/crypto/cryptobyte/asn1"
+	"internal/x/crypto/cryptobyte/asn1"
 )
 
 // This file contains ASN.1-related methods for String and Builder.

src/vendor/golang_org/x/crypto/cryptobyte/asn1/asn1.go → src/internal/x/crypto/cryptobyte/asn1/asn1.go

@@ -4,7 +4,7 @@
 
 // Package asn1 contains supporting types for parsing and building ASN.1
 // messages with the cryptobyte package.
-package asn1 // import "golang.org/x/crypto/cryptobyte/asn1"
+package asn1
 
 // Tag represents an ASN.1 identifier octet, consisting of a tag number
 // (indicating a type) and class (such as context-specific or constructed).

src/vendor/golang_org/x/crypto/cryptobyte/asn1_test.go → src/internal/x/crypto/cryptobyte/asn1_test.go

@@ -12,7 +12,7 @@ import (
 	"testing"
 	"time"
 
-	"golang_org/x/crypto/cryptobyte/asn1"
+	"internal/x/crypto/cryptobyte/asn1"
 )
 
 type readASN1Test struct {

src/vendor/golang_org/x/crypto/cryptobyte/example_test.go → src/internal/x/crypto/cryptobyte/example_test.go

@@ -8,8 +8,8 @@ import (
 	"errors"
 	"fmt"
 
-	"golang_org/x/crypto/cryptobyte"
-	"golang_org/x/crypto/cryptobyte/asn1"
+	"internal/x/crypto/cryptobyte"
+	"internal/x/crypto/cryptobyte/asn1"
 )
 
 func ExampleString_lengthPrefixed() {