go-legacy-win7/patches/0002-Restore-GOPATH-mode-get.patch

From d02338f60a2671b5d8f748956aa90cf7011b72e2 Mon Sep 17 00:00:00 2001
From: Vorapol Rinsatitnon <vorapol.r@pm.me>
Date: Sun, 22 Sep 2024 00:23:47 +1000
Subject: [PATCH] Restore GOPATH-mode get (revert de4d503)

---
 src/cmd/go/alldocs.go                         |  66 ++
 src/cmd/go/go_test.go                         | 100 +++
 src/cmd/go/internal/get/get.go                | 640 ++++++++++++++++++
 src/cmd/go/internal/get/tag_test.go           | 100 +++
 src/cmd/go/internal/help/help.go              |   7 +
 src/cmd/go/internal/modget/get.go             |  17 +
 src/cmd/go/main.go                            |  10 +
 src/cmd/go/testdata/script/get_404_meta.txt   |   3 +
 src/cmd/go/testdata/script/get_brace.txt      |  51 ++
 .../script/get_custom_domain_wildcard.txt     |   6 +
 src/cmd/go/testdata/script/get_dash_t.txt     |   9 +
 .../go/testdata/script/get_domain_root.txt    |  20 +
 .../script/get_dot_slash_download.txt         |  10 +
 src/cmd/go/testdata/script/get_dotfiles.txt   |  64 ++
 src/cmd/go/testdata/script/get_go_file.txt    |  60 ++
 src/cmd/go/testdata/script/get_goroot.txt     |  53 ++
 src/cmd/go/testdata/script/get_insecure.txt   |  16 +
 .../script/get_insecure_custom_domain.txt     |   8 +
 .../go/testdata/script/get_insecure_env.txt   |  29 +
 .../testdata/script/get_insecure_redirect.txt |  14 +
 .../testdata/script/get_insecure_update.txt   |  14 +
 .../testdata/script/get_internal_wildcard.txt |   6 +
 src/cmd/go/testdata/script/get_issue11307.txt |   9 +
 src/cmd/go/testdata/script/get_issue16471.txt |  23 +
 src/cmd/go/testdata/script/get_issue22125.txt |  14 +
 src/cmd/go/testdata/script/get_legacy.txt     |  58 ++
 src/cmd/go/testdata/script/get_non_pkg.txt    |  14 +
 src/cmd/go/testdata/script/get_race.txt       |   8 +
 src/cmd/go/testdata/script/get_test_only.txt  |   6 +
 src/cmd/go/testdata/script/get_tilde.txt      |  25 +
 src/cmd/go/testdata/script/get_update.txt     |  25 +
 src/cmd/go/testdata/script/get_update_all.txt |   7 +
 .../script/get_update_unknown_protocol.txt    |  14 +
 .../testdata/script/get_update_wildcard.txt   |  16 +
 .../testdata/script/get_vcs_error_message.txt |   9 +
 src/cmd/go/testdata/script/get_vendor.txt     |  95 +++
 .../go/testdata/script/get_with_git_trace.txt |   9 +
 .../go/testdata/script/gopath_moved_repo.txt  |  67 ++
 src/cmd/go/testdata/script/govcs.txt          |  83 +++
 src/cmd/go/testdata/script/help.txt           |   2 +-
 src/cmd/go/testdata/script/mod_versions.txt   |   2 +-
 .../script/vendor_list_issue11977.txt         |  78 +--
 .../script/vendor_test_issue11864.txt         |  79 +--
 .../script/vendor_test_issue14613.txt         |  46 +-
 44 files changed, 1801 insertions(+), 191 deletions(-)
 create mode 100644 src/cmd/go/internal/get/get.go
 create mode 100644 src/cmd/go/internal/get/tag_test.go
 create mode 100644 src/cmd/go/testdata/script/get_brace.txt
 create mode 100644 src/cmd/go/testdata/script/get_custom_domain_wildcard.txt
 create mode 100644 src/cmd/go/testdata/script/get_dash_t.txt
 create mode 100644 src/cmd/go/testdata/script/get_domain_root.txt
 create mode 100644 src/cmd/go/testdata/script/get_dot_slash_download.txt
 create mode 100644 src/cmd/go/testdata/script/get_dotfiles.txt
 create mode 100644 src/cmd/go/testdata/script/get_go_file.txt
 create mode 100644 src/cmd/go/testdata/script/get_goroot.txt
 create mode 100644 src/cmd/go/testdata/script/get_insecure_custom_domain.txt
 create mode 100644 src/cmd/go/testdata/script/get_insecure_env.txt
 create mode 100644 src/cmd/go/testdata/script/get_insecure_redirect.txt
 create mode 100644 src/cmd/go/testdata/script/get_insecure_update.txt
 create mode 100644 src/cmd/go/testdata/script/get_internal_wildcard.txt
 create mode 100644 src/cmd/go/testdata/script/get_issue11307.txt
 create mode 100644 src/cmd/go/testdata/script/get_issue16471.txt
 create mode 100644 src/cmd/go/testdata/script/get_issue22125.txt
 create mode 100644 src/cmd/go/testdata/script/get_legacy.txt
 create mode 100644 src/cmd/go/testdata/script/get_non_pkg.txt
 create mode 100644 src/cmd/go/testdata/script/get_race.txt
 create mode 100644 src/cmd/go/testdata/script/get_test_only.txt
 create mode 100644 src/cmd/go/testdata/script/get_tilde.txt
 create mode 100644 src/cmd/go/testdata/script/get_update.txt
 create mode 100644 src/cmd/go/testdata/script/get_update_all.txt
 create mode 100644 src/cmd/go/testdata/script/get_update_unknown_protocol.txt
 create mode 100644 src/cmd/go/testdata/script/get_update_wildcard.txt
 create mode 100644 src/cmd/go/testdata/script/get_vcs_error_message.txt
 create mode 100644 src/cmd/go/testdata/script/get_vendor.txt
 create mode 100644 src/cmd/go/testdata/script/get_with_git_trace.txt
 create mode 100644 src/cmd/go/testdata/script/gopath_moved_repo.txt

diff --git a/src/cmd/go/alldocs.go b/src/cmd/go/alldocs.go
index 75e6d65..abbad2c 100644
--- a/src/cmd/go/alldocs.go
+++ b/src/cmd/go/alldocs.go
@@ -45,9 +45,11 @@
 //	filetype        file types
 //	go.mod          the go.mod file
 //	gopath          GOPATH environment variable
+//	gopath-get      legacy GOPATH go get
 //	goproxy         module proxy protocol
 //	importpath      import path syntax
 //	modules         modules, module versions, and more
+//	module-get      module-aware go get
 //	module-auth     module authentication using go.sum
 //	packages        package lists and patterns
 //	private         configuration for downloading non-public code
@@ -2661,6 +2663,70 @@
 //
 // See https://golang.org/s/go15vendor for details.
 //
+// # Legacy GOPATH go get
+//
+// The 'go get' command changes behavior depending on whether the
+// go command is running in module-aware mode or legacy GOPATH mode.
+// This help text, accessible as 'go help gopath-get' even in module-aware mode,
+// describes 'go get' as it operates in legacy GOPATH mode.
+//
+// Usage: go get [-d] [-f] [-t] [-u] [-v] [-fix] [build flags] [packages]
+//
+// Get downloads the packages named by the import paths, along with their
+// dependencies. It then installs the named packages, like 'go install'.
+//
+// The -d flag instructs get to stop after downloading the packages; that is,
+// it instructs get not to install the packages.
+//
+// The -f flag, valid only when -u is set, forces get -u not to verify that
+// each package has been checked out from the source control repository
+// implied by its import path. This can be useful if the source is a local fork
+// of the original.
+//
+// The -fix flag instructs get to run the fix tool on the downloaded packages
+// before resolving dependencies or building the code.
+//
+// The -t flag instructs get to also download the packages required to build
+// the tests for the specified packages.
+//
+// The -u flag instructs get to use the network to update the named packages
+// and their dependencies. By default, get uses the network to check out
+// missing packages but does not use it to look for updates to existing packages.
+//
+// The -v flag enables verbose progress and debug output.
+//
+// Get also accepts build flags to control the installation. See 'go help build'.
+//
+// When checking out a new package, get creates the target directory
+// GOPATH/src/<import-path>. If the GOPATH contains multiple entries,
+// get uses the first one. For more details see: 'go help gopath'.
+//
+// When checking out or updating a package, get looks for a branch or tag
+// that matches the locally installed version of Go. The most important
+// rule is that if the local installation is running version "go1", get
+// searches for a branch or tag named "go1". If no such version exists
+// it retrieves the default branch of the package.
+//
+// When go get checks out or updates a Git repository,
+// it also updates any git submodules referenced by the repository.
+//
+// Get never checks out or updates code stored in vendor directories.
+//
+// For more about build flags, see 'go help build'.
+//
+// For more about specifying packages, see 'go help packages'.
+//
+// For more about how 'go get' finds source code to
+// download, see 'go help importpath'.
+//
+// This text describes the behavior of get when using GOPATH
+// to manage source code and dependencies.
+// If instead the go command is running in module-aware mode,
+// the details of get's flags and effects change, as does 'go help get'.
+// See 'go help modules' and 'go help module-get'.
+//
+// See also: go build, go install, go clean.
+//
 // # Module proxy protocol
 //
 // A Go module proxy is any web server that can respond to GET requests for
diff --git a/src/cmd/go/go_test.go b/src/cmd/go/go_test.go
index b45a905..b06fef6 100644
--- a/src/cmd/go/go_test.go
+++ b/src/cmd/go/go_test.go
@@ -972,6 +972,77 @@ func TestNewReleaseRebuildsStalePackagesInGOPATH(t *testing.T) {
 	tg.wantNotStale("p1", "", "./testgo list claims p1 is stale after building with old release")
 }
 
+// cmd/go: custom import path checking should not apply to Go packages without import comment.
+func TestIssue10952(t *testing.T) {
+	testenv.MustHaveExecPath(t, "git")
+
+	tg := testgo(t)
+	defer tg.cleanup()
+	tg.parallel()
+	tg.acquireNet()
+
+	tg.tempDir("src")
+	tg.setenv("GOPATH", tg.path("."))
+	const importPath = "github.com/zombiezen/go-get-issue-10952"
+	tg.run("get", "-d", "-u", importPath)
+	repoDir := tg.path("src/" + importPath)
+	tg.runGit(repoDir, "remote", "set-url", "origin", "https://"+importPath+".git")
+	tg.run("get", "-d", "-u", importPath)
+}
+
+// Test git clone URL that uses SCP-like syntax and custom import path checking.
+func TestIssue11457(t *testing.T) {
+	testenv.MustHaveExecPath(t, "git")
+
+	tg := testgo(t)
+	defer tg.cleanup()
+	tg.parallel()
+	tg.acquireNet()
+
+	tg.tempDir("src")
+	tg.setenv("GOPATH", tg.path("."))
+	const importPath = "rsc.io/go-get-issue-11457"
+	tg.run("get", "-d", "-u", importPath)
+	repoDir := tg.path("src/" + importPath)
+	tg.runGit(repoDir, "remote", "set-url", "origin", "git@github.com:rsc/go-get-issue-11457")
+
+	// At this time, custom import path checking compares remotes verbatim (rather than
+	// just the host and path, skipping scheme and user), so we expect go get -u to fail.
+	// However, the goal of this test is to verify that gitRemoteRepo correctly parsed
+	// the SCP-like syntax, and we expect it to appear in the error message.
+	tg.runFail("get", "-d", "-u", importPath)
+	want := " is checked out from ssh://git@github.com/rsc/go-get-issue-11457"
+	if !strings.HasSuffix(strings.TrimSpace(tg.getStderr()), want) {
+		t.Error("expected clone URL to appear in stderr")
+	}
+}
+
+func TestGetGitDefaultBranch(t *testing.T) {
+	testenv.MustHaveExecPath(t, "git")
+
+	tg := testgo(t)
+	defer tg.cleanup()
+	tg.parallel()
+	tg.acquireNet()
+
+	tg.tempDir("src")
+	tg.setenv("GOPATH", tg.path("."))
+
+	// This repo has two branches, master and another-branch.
+	// The another-branch is the default that you get from 'git clone'.
+	// The go get command variants should not override this.
+	const importPath = "github.com/rsc/go-get-default-branch"
+
+	tg.run("get", "-d", importPath)
+	repoDir := tg.path("src/" + importPath)
+	tg.runGit(repoDir, "branch", "--contains", "HEAD")
+	tg.grepStdout(`\* another-branch`, "not on correct default branch")
+
+	tg.run("get", "-d", "-u", importPath)
+	tg.runGit(repoDir, "branch", "--contains", "HEAD")
+	tg.grepStdout(`\* another-branch`, "not on correct default branch")
+}
+
 func TestPackageMainTestCompilerFlags(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
@@ -1292,6 +1363,35 @@ func TestDefaultGOPATH(t *testing.T) {
 	tg.grepStdoutNot(".", "want unset GOPATH because GOROOT=$HOME/go/")
 }
 
+func TestDefaultGOPATHGet(t *testing.T) {
+	testenv.MustHaveExecPath(t, "git")
+
+	tg := testgo(t)
+	defer tg.cleanup()
+	tg.parallel()
+	tg.acquireNet()
+
+	tg.setenv("GOPATH", "")
+	tg.tempDir("home")
+	tg.setenv(homeEnvName(), tg.path("home"))
+
+	// warn for creating directory
+	tg.run("get", "-v", "github.com/golang/example/hello")
+	tg.grepStderr("created GOPATH="+regexp.QuoteMeta(tg.path("home/go"))+"; see 'go help gopath'", "did not create GOPATH")
+
+	// no warning if directory already exists
+	tg.must(robustio.RemoveAll(tg.path("home/go")))
+	tg.tempDir("home/go")
+	tg.run("get", "github.com/golang/example/hello")
+	tg.grepStderrNot(".", "expected no output on standard error")
+
+	// error if $HOME/go is a file
+	tg.must(robustio.RemoveAll(tg.path("home/go")))
+	tg.tempFile("home/go", "")
+	tg.runFail("get", "github.com/golang/example/hello")
+	tg.grepStderr(`mkdir .*[/\\]go: .*(not a directory|cannot find the path)`, "expected error because $HOME/go is a file")
+}
+
 func TestDefaultGOPATHPrintedSearchList(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
diff --git a/src/cmd/go/internal/get/get.go b/src/cmd/go/internal/get/get.go
new file mode 100644
index 0000000..06b567a
--- /dev/null
+++ b/src/cmd/go/internal/get/get.go
@@ -0,0 +1,640 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package get implements the “go get” command.
+package get
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+
+	"cmd/go/internal/base"
+	"cmd/go/internal/cfg"
+	"cmd/go/internal/load"
+	"cmd/go/internal/search"
+	"cmd/go/internal/str"
+	"cmd/go/internal/vcs"
+	"cmd/go/internal/web"
+	"cmd/go/internal/work"
+
+	"golang.org/x/mod/module"
+)
+
+var CmdGet = &base.Command{
+	UsageLine: "go get [-d] [-f] [-t] [-u] [-v] [-fix] [build flags] [packages]",
+	Short:     "download and install packages and dependencies",
+	Long: `
+Get downloads the packages named by the import paths, along with their
+dependencies. It then installs the named packages, like 'go install'.
+
+The -d flag instructs get to stop after downloading the packages; that is,
+it instructs get not to install the packages.
+
+The -f flag, valid only when -u is set, forces get -u not to verify that
+each package has been checked out from the source control repository
+implied by its import path. This can be useful if the source is a local fork
+of the original.
+
+The -fix flag instructs get to run the fix tool on the downloaded packages
+before resolving dependencies or building the code.
+
+The -t flag instructs get to also download the packages required to build
+the tests for the specified packages.
+
+The -u flag instructs get to use the network to update the named packages
+and their dependencies. By default, get uses the network to check out
+missing packages but does not use it to look for updates to existing packages.
+
+The -v flag enables verbose progress and debug output.
+
+Get also accepts build flags to control the installation. See 'go help build'.
+
+When checking out a new package, get creates the target directory
+GOPATH/src/<import-path>. If the GOPATH contains multiple entries,
+get uses the first one. For more details see: 'go help gopath'.
+
+When checking out or updating a package, get looks for a branch or tag
+that matches the locally installed version of Go. The most important
+rule is that if the local installation is running version "go1", get
+searches for a branch or tag named "go1". If no such version exists
+it retrieves the default branch of the package.
+
+When go get checks out or updates a Git repository,
+it also updates any git submodules referenced by the repository.
+
+Get never checks out or updates code stored in vendor directories.
+
+For more about build flags, see 'go help build'.
+
+For more about specifying packages, see 'go help packages'.
+
+For more about how 'go get' finds source code to
+download, see 'go help importpath'.
+
+This text describes the behavior of get when using GOPATH
+to manage source code and dependencies.
+If instead the go command is running in module-aware mode,
+the details of get's flags and effects change, as does 'go help get'.
+See 'go help modules' and 'go help module-get'.
+
+See also: go build, go install, go clean.
+	`,
+}
+
+var HelpGopathGet = &base.Command{
+	UsageLine: "gopath-get",
+	Short:     "legacy GOPATH go get",
+	Long: `
+The 'go get' command changes behavior depending on whether the
+go command is running in module-aware mode or legacy GOPATH mode.
+This help text, accessible as 'go help gopath-get' even in module-aware mode,
+describes 'go get' as it operates in legacy GOPATH mode.
+
+Usage: ` + CmdGet.UsageLine + `
+` + CmdGet.Long,
+}
+
+var (
+	getD        = CmdGet.Flag.Bool("d", false, "")
+	getF        = CmdGet.Flag.Bool("f", false, "")
+	getT        = CmdGet.Flag.Bool("t", false, "")
+	getU        = CmdGet.Flag.Bool("u", false, "")
+	getFix      = CmdGet.Flag.Bool("fix", false, "")
+	getInsecure = CmdGet.Flag.Bool("insecure", false, "")
+)
+
+func init() {
+	work.AddBuildFlags(CmdGet, work.OmitModFlag|work.OmitModCommonFlags)
+	CmdGet.Run = runGet // break init loop
+}
+
+func runGet(ctx context.Context, cmd *base.Command, args []string) {
+	if cfg.ModulesEnabled {
+		// Should not happen: main.go should install the separate module-enabled get code.
+		base.Fatalf("go: modules not implemented")
+	}
+
+	work.BuildInit()
+
+	if *getF && !*getU {
+		base.Fatalf("go: cannot use -f flag without -u")
+	}
+	if *getInsecure {
+		base.Fatalf("go: -insecure flag is no longer supported; use GOINSECURE instead")
+	}
+
+	// Disable any prompting for passwords by Git itself.
+	// Only has an effect for 2.3.0 or later, but avoiding
+	// the prompt in earlier versions is just too hard.
+	// If user has explicitly set GIT_TERMINAL_PROMPT=1, keep
+	// prompting.
+	// See golang.org/issue/9341 and golang.org/issue/12706.
+	if os.Getenv("GIT_TERMINAL_PROMPT") == "" {
+		os.Setenv("GIT_TERMINAL_PROMPT", "0")
+	}
+
+	// Also disable prompting for passwords by the 'ssh' subprocess spawned by
+	// Git, because apparently GIT_TERMINAL_PROMPT isn't sufficient to do that.
+	// Adding '-o BatchMode=yes' should do the trick.
+	//
+	// If a Git subprocess forks a child into the background to cache a new connection,
+	// that child keeps stdout/stderr open. After the Git subprocess exits,
+	// os /exec expects to be able to read from the stdout/stderr pipe
+	// until EOF to get all the data that the Git subprocess wrote before exiting.
+	// The EOF doesn't come until the child exits too, because the child
+	// is holding the write end of the pipe.
+	// This is unfortunate, but it has come up at least twice
+	// (see golang.org/issue/13453 and golang.org/issue/16104)
+	// and confuses users when it does.
+	// If the user has explicitly set GIT_SSH or GIT_SSH_COMMAND,
+	// assume they know what they are doing and don't step on it.
+	// But default to turning off ControlMaster.
+	if os.Getenv("GIT_SSH") == "" && os.Getenv("GIT_SSH_COMMAND") == "" {
+		os.Setenv("GIT_SSH_COMMAND", "ssh -o ControlMaster=no -o BatchMode=yes")
+	}
+
+	// And one more source of Git prompts: the Git Credential Manager Core for Windows.
+	//
+	// See https://github.com/microsoft/Git-Credential-Manager-Core/blob/master/docs/environment.md#gcm_interactive.
+	if os.Getenv("GCM_INTERACTIVE") == "" {
+		os.Setenv("GCM_INTERACTIVE", "never")
+	}
+
+	// Phase 1. Download/update.
+	var stk load.ImportStack
+	mode := 0
+	if *getT {
+		mode |= load.GetTestDeps
+	}
+	for _, pkg := range downloadPaths(args) {
+		download(ctx, pkg, nil, &stk, mode)
+	}
+	base.ExitIfErrors()
+
+	// Phase 2. Rescan packages and re-evaluate args list.
+
+	// Code we downloaded and all code that depends on it
+	// needs to be evicted from the package cache so that
+	// the information will be recomputed. Instead of keeping
+	// track of the reverse dependency information, evict
+	// everything.
+	load.ClearPackageCache()
+
+	pkgs := load.PackagesAndErrors(ctx, load.PackageOpts{}, args)
+	load.CheckPackageErrors(pkgs)
+
+	// Phase 3. Install.
+	if *getD {
+		// Download only.
+		// Check delayed until now so that downloadPaths
+		// and CheckPackageErrors have a chance to print errors.
+		return
+	}
+
+	work.InstallPackages(ctx, args, pkgs)
+}
+
+// downloadPaths prepares the list of paths to pass to download.
+// It expands ... patterns that can be expanded. If there is no match
+// for a particular pattern, downloadPaths leaves it in the result list,
+// in the hope that we can figure out the repository from the
+// initial ...-free prefix.
+func downloadPaths(patterns []string) []string {
+	for _, arg := range patterns {
+		if strings.Contains(arg, "@") {
+			base.Fatalf("go: can only use path@version syntax with 'go get' and 'go install' in module-aware mode")
+		}
+
+		// Guard against 'go get x.go', a common mistake.
+		// Note that package and module paths may end with '.go', so only print an error
+		// if the argument has no slash or refers to an existing file.
+		if strings.HasSuffix(arg, ".go") {
+			if !strings.Contains(arg, "/") {
+				base.Errorf("go: %s: arguments must be package or module paths", arg)
+				continue
+			}
+			if fi, err := os.Stat(arg); err == nil && !fi.IsDir() {
+				base.Errorf("go: %s exists as a file, but 'go get' requires package arguments", arg)
+			}
+		}
+	}
+	base.ExitIfErrors()
+
+	var pkgs []string
+	noModRoots := []string{}
+	for _, m := range search.ImportPathsQuiet(patterns, noModRoots) {
+		if len(m.Pkgs) == 0 && strings.Contains(m.Pattern(), "...") {
+			pkgs = append(pkgs, m.Pattern())
+		} else {
+			pkgs = append(pkgs, m.Pkgs...)
+		}
+	}
+	return pkgs
+}
+
+// downloadCache records the import paths we have already
+// considered during the download, to avoid duplicate work when
+// there is more than one dependency sequence leading to
+// a particular package.
+var downloadCache = map[string]bool{}
+
+// downloadRootCache records the version control repository
+// root directories we have already considered during the download.
+// For example, all the packages in the github.com/google/codesearch repo
+// share the same root (the directory for that path), and we only need
+// to run the hg commands to consider each repository once.
+var downloadRootCache = map[string]bool{}
+
+// download runs the download half of the get command
+// for the package or pattern named by the argument.
+func download(ctx context.Context, arg string, parent *load.Package, stk *load.ImportStack, mode int) {
+	if mode&load.ResolveImport != 0 {
+		// Caller is responsible for expanding vendor paths.
+		panic("internal error: download mode has useVendor set")
+	}
+	load1 := func(path string, mode int) *load.Package {
+		if parent == nil {
+			mode := 0 // don't do module or vendor resolution
+			return load.LoadPackage(ctx, load.PackageOpts{}, path, base.Cwd(), stk, nil, mode)
+		}
+		p, err := load.LoadImport(ctx, load.PackageOpts{}, path, parent.Dir, parent, stk, nil, mode|load.ResolveModule)
+		if err != nil {
+			base.Errorf("%s", err)
+		}
+		return p
+	}
+
+	p := load1(arg, mode)
+	if p.Error != nil && p.Error.Hard {
+		base.Errorf("%s", p.Error)
+		return
+	}
+
+	// loadPackage inferred the canonical ImportPath from arg.
+	// Use that in the following to prevent hysteresis effects
+	// in e.g. downloadCache and packageCache.
+	// This allows invocations such as:
+	//   mkdir -p $GOPATH/src/github.com/user
+	//   cd $GOPATH/src/github.com/user
+	//   go get ./foo
+	// see: golang.org/issue/9767
+	arg = p.ImportPath
+
+	// There's nothing to do if this is a package in the standard library.
+	if p.Standard {
+		return
+	}
+
+	// Only process each package once.
+	// (Unless we're fetching test dependencies for this package,
+	// in which case we want to process it again.)
+	if downloadCache[arg] && mode&load.GetTestDeps == 0 {
+		return
+	}
+	downloadCache[arg] = true
+
+	pkgs := []*load.Package{p}
+	wildcardOkay := len(*stk) == 0
+	isWildcard := false
+
+	// Download if the package is missing, or update if we're using -u.
+	if p.Dir == "" || *getU {
+		// The actual download.
+		stk.Push(arg)
+		err := downloadPackage(p)
+		if err != nil {
+			base.Errorf("%s", &load.PackageError{ImportStack: stk.Copy(), Err: err})
+			stk.Pop()
+			return
+		}
+		stk.Pop()
+
+		args := []string{arg}
+		// If the argument has a wildcard in it, re-evaluate the wildcard.
+		// We delay this until after reloadPackage so that the old entry
+		// for p has been replaced in the package cache.
+		if wildcardOkay && strings.Contains(arg, "...") {
+			match := search.NewMatch(arg)
+			if match.IsLocal() {
+				noModRoots := []string{} // We're in gopath mode, so there are no modroots.
+				match.MatchDirs(noModRoots)
+				args = match.Dirs
+			} else {
+				match.MatchPackages()
+				args = match.Pkgs
+			}
+			for _, err := range match.Errs {
+				base.Errorf("%s", err)
+			}
+			isWildcard = true
+		}
+
+		// Clear all relevant package cache entries before
+		// doing any new loads.
+		load.ClearPackageCachePartial(args)
+
+		pkgs = pkgs[:0]
+		for _, arg := range args {
+			// Note: load calls loadPackage or loadImport,
+			// which push arg onto stk already.
+			// Do not push here too, or else stk will say arg imports arg.
+			p := load1(arg, mode)
+			if p.Error != nil {
+				base.Errorf("%s", p.Error)
+				continue
+			}
+			pkgs = append(pkgs, p)
+		}
+	}
+
+	// Process package, which might now be multiple packages
+	// due to wildcard expansion.
+	for _, p := range pkgs {
+		if *getFix {
+			files := base.RelPaths(p.InternalAllGoFiles())
+			base.Run(cfg.BuildToolexec, str.StringList(base.Tool("fix"), files))
+
+			// The imports might have changed, so reload again.
+			p = load.ReloadPackageNoFlags(arg, stk)
+			if p.Error != nil {
+				base.Errorf("%s", p.Error)
+				return
+			}
+		}
+
+		if isWildcard {
+			// Report both the real package and the
+			// wildcard in any error message.
+			stk.Push(p.ImportPath)
+		}
+
+		// Process dependencies, now that we know what they are.
+		imports := p.Imports
+		if mode&load.GetTestDeps != 0 {
+			// Process test dependencies when -t is specified.
+			// (But don't get test dependencies for test dependencies:
+			// we always pass mode 0 to the recursive calls below.)
+			imports = str.StringList(imports, p.TestImports, p.XTestImports)
+		}
+		for i, path := range imports {
+			if path == "C" {
+				continue
+			}
+			// Fail fast on import naming full vendor path.
+			// Otherwise expand path as needed for test imports.
+			// Note that p.Imports can have additional entries beyond p.Internal.Build.Imports.
+			orig := path
+			if i < len(p.Internal.Build.Imports) {
+				orig = p.Internal.Build.Imports[i]
+			}
+			if j, ok := load.FindVendor(orig); ok {
+				stk.Push(path)
+				err := &load.PackageError{
+					ImportStack: stk.Copy(),
+					Err:         load.ImportErrorf(path, "%s must be imported as %s", path, path[j+len("vendor/"):]),
+				}
+				stk.Pop()
+				base.Errorf("%s", err)
+				continue
+			}
+			// If this is a test import, apply module and vendor lookup now.
+			// We cannot pass ResolveImport to download, because
+			// download does caching based on the value of path,
+			// so it must be the fully qualified path already.
+			if i >= len(p.Imports) {
+				path = load.ResolveImportPath(p, path)
+			}
+			download(ctx, path, p, stk, 0)
+		}
+
+		if isWildcard {
+			stk.Pop()
+		}
+	}
+}
+
+// downloadPackage runs the create or download command
+// to make the first copy of or update a copy of the given package.
+func downloadPackage(p *load.Package) error {
+	var (
+		vcsCmd                  *vcs.Cmd
+		repo, rootPath, repoDir string
+		err                     error
+		blindRepo               bool // set if the repo has unusual configuration
+	)
+
+	// p can be either a real package, or a pseudo-package whose “import path” is
+	// actually a wildcard pattern.
+	// Trim the path at the element containing the first wildcard,
+	// and hope that it applies to the wildcarded parts too.
+	// This makes 'go get rsc.io/pdf/...' work in a fresh GOPATH.
+	importPrefix := p.ImportPath
+	if i := strings.Index(importPrefix, "..."); i >= 0 {
+		slash := strings.LastIndexByte(importPrefix[:i], '/')
+		if slash < 0 {
+			return fmt.Errorf("cannot expand ... in %q", p.ImportPath)
+		}
+		importPrefix = importPrefix[:slash]
+	}
+	if err := checkImportPath(importPrefix); err != nil {
+		return fmt.Errorf("%s: invalid import path: %v", p.ImportPath, err)
+	}
+	security := web.SecureOnly
+	if module.MatchPrefixPatterns(cfg.GOINSECURE, importPrefix) {
+		security = web.Insecure
+	}
+
+	if p.Internal.Build.SrcRoot != "" {
+		// Directory exists. Look for checkout along path to src.
+		const allowNesting = false
+		repoDir, vcsCmd, err = vcs.FromDir(p.Dir, p.Internal.Build.SrcRoot, allowNesting)
+		if err != nil {
+			return err
+		}
+		if !str.HasFilePathPrefix(repoDir, p.Internal.Build.SrcRoot) {
+			panic(fmt.Sprintf("repository %q not in source root %q", repo, p.Internal.Build.SrcRoot))
+		}
+		rootPath = str.TrimFilePathPrefix(repoDir, p.Internal.Build.SrcRoot)
+		if err := vcs.CheckGOVCS(vcsCmd, rootPath); err != nil {
+			return err
+		}
+
+		repo = "<local>" // should be unused; make distinctive
+
+		// Double-check where it came from.
+		if *getU && vcsCmd.RemoteRepo != nil {
+			dir := filepath.Join(p.Internal.Build.SrcRoot, filepath.FromSlash(rootPath))
+			remote, err := vcsCmd.RemoteRepo(vcsCmd, dir)
+			if err != nil {
+				// Proceed anyway. The package is present; we likely just don't understand
+				// the repo configuration (e.g. unusual remote protocol).
+				blindRepo = true
+			}
+			repo = remote
+			if !*getF && err == nil {
+				if rr, err := vcs.RepoRootForImportPath(importPrefix, vcs.IgnoreMod, security); err == nil {
+					repo := rr.Repo
+					if rr.VCS.ResolveRepo != nil {
+						resolved, err := rr.VCS.ResolveRepo(rr.VCS, dir, repo)
+						if err == nil {
+							repo = resolved
+						}
+					}
+					if remote != repo && rr.IsCustom {
+						return fmt.Errorf("%s is a custom import path for %s, but %s is checked out from %s", rr.Root, repo, dir, remote)
+					}
+				}
+			}
+		}
+	} else {
+		// Analyze the import path to determine the version control system,
+		// repository, and the import path for the root of the repository.
+		rr, err := vcs.RepoRootForImportPath(importPrefix, vcs.IgnoreMod, security)
+		if err != nil {
+			return err
+		}
+		vcsCmd, repo, rootPath = rr.VCS, rr.Repo, rr.Root
+	}
+	if !blindRepo && !vcsCmd.IsSecure(repo) && security != web.Insecure {
+		return fmt.Errorf("cannot download: %v uses insecure protocol", repo)
+	}
+
+	if p.Internal.Build.SrcRoot == "" {
+		// Package not found. Put in first directory of $GOPATH.
+		list := filepath.SplitList(cfg.BuildContext.GOPATH)
+		if len(list) == 0 {
+			return fmt.Errorf("cannot download: $GOPATH not set. For more details see: 'go help gopath'")
+		}
+		// Guard against people setting GOPATH=$GOROOT.
+		if filepath.Clean(list[0]) == filepath.Clean(cfg.GOROOT) {
+			return fmt.Errorf("cannot download: $GOPATH must not be set to $GOROOT. For more details see: 'go help gopath'")
+		}
+		if _, err := os.Stat(filepath.Join(list[0], "src/cmd/go/alldocs.go")); err == nil {
+			return fmt.Errorf("cannot download: %s is a GOROOT, not a GOPATH. For more details see: 'go help gopath'", list[0])
+		}
+		p.Internal.Build.Root = list[0]
+		p.Internal.Build.SrcRoot = filepath.Join(list[0], "src")
+		p.Internal.Build.PkgRoot = filepath.Join(list[0], "pkg")
+	}
+	root := filepath.Join(p.Internal.Build.SrcRoot, filepath.FromSlash(rootPath))
+
+	if err := vcs.CheckNested(vcsCmd, root, p.Internal.Build.SrcRoot); err != nil {
+		return err
+	}
+
+	// If we've considered this repository already, don't do it again.
+	if downloadRootCache[root] {
+		return nil
+	}
+	downloadRootCache[root] = true
+
+	if cfg.BuildV {
+		fmt.Fprintf(os.Stderr, "%s (download)\n", rootPath)
+	}
+
+	// Check that this is an appropriate place for the repo to be checked out.
+	// The target directory must either not exist or have a repo checked out already.
+	meta := filepath.Join(root, "."+vcsCmd.Cmd)
+	if _, err := os.Stat(meta); err != nil {
+		// Metadata file or directory does not exist. Prepare to checkout new copy.
+		// Some version control tools require the target directory not to exist.
+		// We require that too, just to avoid stepping on existing work.
+		if _, err := os.Stat(root); err == nil {
+			return fmt.Errorf("%s exists but %s does not - stale checkout?", root, meta)
+		}
+
+		_, err := os.Stat(p.Internal.Build.Root)
+		gopathExisted := err == nil
+
+		// Some version control tools require the parent of the target to exist.
+		parent, _ := filepath.Split(root)
+		if err = os.MkdirAll(parent, 0777); err != nil {
+			return err
+		}
+		if cfg.BuildV && !gopathExisted && p.Internal.Build.Root == cfg.BuildContext.GOPATH {
+			fmt.Fprintf(os.Stderr, "created GOPATH=%s; see 'go help gopath'\n", p.Internal.Build.Root)
+		}
+
+		if err = vcsCmd.Create(root, repo); err != nil {
+			return err
+		}
+	} else {
+		// Metadata directory does exist; download incremental updates.
+		if err = vcsCmd.Download(root); err != nil {
+			return err
+		}
+	}
+
+	if cfg.BuildN {
+		// Do not show tag sync in -n; it's noise more than anything,
+		// and since we're not running commands, no tag will be found.
+		// But avoid printing nothing.
+		fmt.Fprintf(os.Stderr, "# cd %s; %s sync/update\n", root, vcsCmd.Cmd)
+		return nil
+	}
+
+	// Select and sync to appropriate version of the repository.
+	tags, err := vcsCmd.Tags(root)
+	if err != nil {
+		return err
+	}
+	vers := runtime.Version()
+	if i := strings.Index(vers, " "); i >= 0 {
+		vers = vers[:i]
+	}
+	if err := vcsCmd.TagSync(root, selectTag(vers, tags)); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// selectTag returns the closest matching tag for a given version.
+// Closest means the latest one that is not after the current release.
+// Version "goX" (or "goX.Y" or "goX.Y.Z") matches tags of the same form.
+// Version "release.rN" matches tags of the form "go.rN" (N being a floating-point number).
+// Version "weekly.YYYY-MM-DD" matches tags like "go.weekly.YYYY-MM-DD".
+//
+// NOTE(rsc): Eventually we will need to decide on some logic here.
+// For now, there is only "go1". This matches the docs in go help get.
+func selectTag(goVersion string, tags []string) (match string) {
+	for _, t := range tags {
+		if t == "go1" {
+			return "go1"
+		}
+	}
+	return ""
+}
+
+// checkImportPath is like module.CheckImportPath, but it forbids leading dots
+// in path elements. This can lead to 'go get' creating .git and other VCS
+// directories in places we might run VCS tools later.
+func checkImportPath(path string) error {
+	if err := module.CheckImportPath(path); err != nil {
+		return err
+	}
+	checkElem := func(elem string) error {
+		if elem[0] == '.' {
+			return fmt.Errorf("malformed import path %q: leading dot in path element", path)
+		}
+		return nil
+	}
+	elemStart := 0
+	for i, r := range path {
+		if r == '/' {
+			if err := checkElem(path[elemStart:]); err != nil {
+				return err
+			}
+			elemStart = i + 1
+		}
+	}
+	if err := checkElem(path[elemStart:]); err != nil {
+		return err
+	}
+	return nil
+}
diff --git a/src/cmd/go/internal/get/tag_test.go b/src/cmd/go/internal/get/tag_test.go
new file mode 100644
index 0000000..9a25dfa
--- /dev/null
+++ b/src/cmd/go/internal/get/tag_test.go
@@ -0,0 +1,100 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package get
+
+import "testing"
+
+var selectTagTestTags = []string{
+	"go.r58",
+	"go.r58.1",
+	"go.r59",
+	"go.r59.1",
+	"go.r61",
+	"go.r61.1",
+	"go.weekly.2010-01-02",
+	"go.weekly.2011-10-12",
+	"go.weekly.2011-10-12.1",
+	"go.weekly.2011-10-14",
+	"go.weekly.2011-11-01",
+	"go1",
+	"go1.0.1",
+	"go1.999",
+	"go1.9.2",
+	"go5",
+
+	// these should be ignored:
+	"release.r59",
+	"release.r59.1",
+	"release",
+	"weekly.2011-10-12",
+	"weekly.2011-10-12.1",
+	"weekly",
+	"foo",
+	"bar",
+	"go.f00",
+	"go!r60",
+	"go.1999-01-01",
+	"go.2x",
+	"go.20000000000000",
+	"go.2.",
+	"go.2.0",
+	"go2x",
+	"go20000000000000",
+	"go2.",
+	"go2.0",
+}
+
+var selectTagTests = []struct {
+	version  string
+	selected string
+}{
+	/*
+		{"release.r57", ""},
+		{"release.r58.2", "go.r58.1"},
+		{"release.r59", "go.r59"},
+		{"release.r59.1", "go.r59.1"},
+		{"release.r60", "go.r59.1"},
+		{"release.r60.1", "go.r59.1"},
+		{"release.r61", "go.r61"},
+		{"release.r66", "go.r61.1"},
+		{"weekly.2010-01-01", ""},
+		{"weekly.2010-01-02", "go.weekly.2010-01-02"},
+		{"weekly.2010-01-02.1", "go.weekly.2010-01-02"},
+		{"weekly.2010-01-03", "go.weekly.2010-01-02"},
+		{"weekly.2011-10-12", "go.weekly.2011-10-12"},
+		{"weekly.2011-10-12.1", "go.weekly.2011-10-12.1"},
+		{"weekly.2011-10-13", "go.weekly.2011-10-12.1"},
+		{"weekly.2011-10-14", "go.weekly.2011-10-14"},
+		{"weekly.2011-10-14.1", "go.weekly.2011-10-14"},
+		{"weekly.2011-11-01", "go.weekly.2011-11-01"},
+		{"weekly.2014-01-01", "go.weekly.2011-11-01"},
+		{"weekly.3000-01-01", "go.weekly.2011-11-01"},
+		{"go1", "go1"},
+		{"go1.1", "go1.0.1"},
+		{"go1.998", "go1.9.2"},
+		{"go1.1000", "go1.999"},
+		{"go6", "go5"},
+
+		// faulty versions:
+		{"release.f00", ""},
+		{"weekly.1999-01-01", ""},
+		{"junk", ""},
+		{"", ""},
+		{"go2x", ""},
+		{"go200000000000", ""},
+		{"go2.", ""},
+		{"go2.0", ""},
+	*/
+	{"anything", "go1"},
+}
+
+func TestSelectTag(t *testing.T) {
+	for _, c := range selectTagTests {
+		selected := selectTag(c.version, selectTagTestTags)
+		if selected != c.selected {
+			t.Errorf("selectTag(%q) = %q, want %q", c.version, selected, c.selected)
+		}
+	}
+}
diff --git a/src/cmd/go/internal/help/help.go b/src/cmd/go/internal/help/help.go
index 4f2607f..229ebc3 100644
--- a/src/cmd/go/internal/help/help.go
+++ b/src/cmd/go/internal/help/help.go
@@ -17,6 +17,7 @@ import (
 
 	"cmd/go/internal/base"
 	"cmd/internal/telemetry/counter"
+	"cmd/go/internal/modload"
 )
 
 var counterErrorsHelpUnknownTopic = counter.New("go/errors:help-unknown-topic")
@@ -37,6 +38,12 @@ func Help(w io.Writer, args []string) {
 		usage := &base.Command{Long: buf.String()}
 		cmds := []*base.Command{usage}
 		for _, cmd := range base.Go.Commands {
+			// Avoid duplication of the "get" documentation.
+			if cmd.UsageLine == "module-get" && modload.Enabled() {
+				continue
+			} else if cmd.UsageLine == "gopath-get" && !modload.Enabled() {
+				continue
+			}
 			cmds = append(cmds, cmd)
 			cmds = append(cmds, cmd.Commands...)
 		}
diff --git a/src/cmd/go/internal/modget/get.go b/src/cmd/go/internal/modget/get.go
index 7343128..966c504 100644
--- a/src/cmd/go/internal/modget/get.go
+++ b/src/cmd/go/internal/modget/get.go
@@ -131,6 +131,23 @@ See also: go build, go install, go clean, go mod.
 	`,
 }
 
+// Note that this help text is a stopgap to make the module-aware get help text
+// available even in non-module settings. It should be deleted when the old get
+// is deleted. It should NOT be considered to set a precedent of having hierarchical
+// help names with dashes.
+var HelpModuleGet = &base.Command{
+	UsageLine: "module-get",
+	Short:     "module-aware go get",
+	Long: `
+The 'go get' command changes behavior depending on whether the
+go command is running in module-aware mode or legacy GOPATH mode.
+This help text, accessible as 'go help module-get' even in legacy GOPATH mode,
+describes 'go get' as it operates in module-aware mode.
+
+Usage: ` + CmdGet.UsageLine + `
+` + CmdGet.Long,
+}
+
 var HelpVCS = &base.Command{
 	UsageLine: "vcs",
 	Short:     "controlling version control with GOVCS",
diff --git a/src/cmd/go/main.go b/src/cmd/go/main.go
index 1c58232..722ab87 100644
--- a/src/cmd/go/main.go
+++ b/src/cmd/go/main.go
@@ -27,6 +27,7 @@ import (
 	"cmd/go/internal/fix"
 	"cmd/go/internal/fmtcmd"
 	"cmd/go/internal/generate"
+	"cmd/go/internal/get"
 	"cmd/go/internal/help"
 	"cmd/go/internal/list"
 	"cmd/go/internal/modcmd"
@@ -78,9 +79,11 @@ func init() {
 		help.HelpFileType,
 		modload.HelpGoMod,
 		help.HelpGopath,
+		get.HelpGopathGet,
 		modfetch.HelpGoproxy,
 		help.HelpImportPath,
 		modload.HelpModules,
+		modget.HelpModuleGet,
 		modfetch.HelpModuleAuth,
 		help.HelpPackages,
 		modfetch.HelpPrivate,
@@ -112,6 +115,13 @@ func main() {
 		base.Usage()
 	}
 
+	if args[0] == "get" || args[0] == "help" {
+		if !modload.WillBeEnabled() {
+			// Replace module-aware get with GOPATH get if appropriate.
+			*modget.CmdGet = *get.CmdGet
+		}
+	}
+
 	cfg.CmdName = args[0] // for error messages
 	if args[0] == "help" {
 		counter.Inc("go/subcommand:" + strings.Join(append([]string{"help"}, args[1:]...), "-"))
diff --git a/src/cmd/go/testdata/script/get_404_meta.txt b/src/cmd/go/testdata/script/get_404_meta.txt
index 7665155..4ffbdeb 100644
--- a/src/cmd/go/testdata/script/get_404_meta.txt
+++ b/src/cmd/go/testdata/script/get_404_meta.txt
@@ -4,6 +4,9 @@
 [!git] skip
 
 env GONOSUMDB=bazil.org,github.com,golang.org
+env GO111MODULE=off
+go get -d bazil.org/fuse/fs/fstestutil
+
 env GO111MODULE=on
 env GOPROXY=direct
 go get bazil.org/fuse/fs/fstestutil
diff --git a/src/cmd/go/testdata/script/get_brace.txt b/src/cmd/go/testdata/script/get_brace.txt
new file mode 100644
index 0000000..34f66a6
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_brace.txt
@@ -0,0 +1,51 @@
+env GO111MODULE=off
+
+[!git] skip
+
+# Set up some empty repositories.
+cd $WORK/_origin/foo
+exec git init
+exec git config user.name 'Nameless Gopher'
+exec git config user.email 'nobody@golang.org'
+exec git commit --allow-empty -m 'create master branch'
+
+cd $WORK
+cd '_origin/{confusing}'
+exec git init
+exec git config user.name 'Nameless Gopher'
+exec git config user.email 'nobody@golang.org'
+exec git commit --allow-empty -m 'create master branch'
+
+# Clone the empty repositories into GOPATH.
+# This tells the Go command where to find them: it takes the place of a user's meta-tag redirector.
+mkdir $GOPATH/src/example.com
+cd $GOPATH/src/example.com
+exec git clone $WORK/_origin/foo
+exec git clone $WORK/_origin/{confusing}
+
+# Commit contents to the repositories.
+cd $WORK/_origin/foo
+exec git add main.go
+exec git commit -m 'add main'
+
+cd $WORK
+cd '_origin/{confusing}'
+exec git add confusing.go
+exec git commit -m 'just try to delete this!'
+
+# 'go get' should refuse to download or update the confusingly-named repo.
+cd $GOPATH/src/example.com/foo
+! go get -u 'example.com/{confusing}'
+stderr 'invalid char'
+! go get -u example.com/foo
+stderr 'invalid import path'
+! exists example.com/{confusing}
+
+-- $WORK/_origin/foo/main.go --
+package main
+import _ "example.com/{confusing}"
+
+func main() {}
+
+-- $WORK/_origin/{confusing}/confusing.go --
+package confusing
diff --git a/src/cmd/go/testdata/script/get_custom_domain_wildcard.txt b/src/cmd/go/testdata/script/get_custom_domain_wildcard.txt
new file mode 100644
index 0000000..45ab524
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_custom_domain_wildcard.txt
@@ -0,0 +1,6 @@
+[!net:rsc.io] skip
+[!git] skip
+env GO111MODULE=off
+
+go get -u rsc.io/pdf/...
+exists $GOPATH/bin/pdfpasswd$GOEXE
diff --git a/src/cmd/go/testdata/script/get_dash_t.txt b/src/cmd/go/testdata/script/get_dash_t.txt
new file mode 100644
index 0000000..8f3a036
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_dash_t.txt
@@ -0,0 +1,9 @@
+# Tests issue 8181
+
+[!net:github.com] skip
+[!git] skip
+env GO111MODULE=off
+
+go get -v -t github.com/rsc/go-get-issue-8181/a github.com/rsc/go-get-issue-8181/b
+go list -test -deps github.com/rsc/go-get-issue-8181/b
+stdout 'x/build/gerrit'
diff --git a/src/cmd/go/testdata/script/get_domain_root.txt b/src/cmd/go/testdata/script/get_domain_root.txt
new file mode 100644
index 0000000..dfcea86
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_domain_root.txt
@@ -0,0 +1,20 @@
+# Tests issue #9357
+# go get foo.io (not foo.io/subdir) was not working consistently.
+
+[!net:go-get-issue-9357.appspot.com] skip
+[!git] skip
+env GO111MODULE=off
+
+# go-get-issue-9357.appspot.com is running
+# the code at github.com/rsc/go-get-issue-9357,
+# a trivial Go on App Engine app that serves a
+# <meta> tag for the domain root.
+go get -d go-get-issue-9357.appspot.com
+go get go-get-issue-9357.appspot.com
+go get -u go-get-issue-9357.appspot.com
+
+rm $GOPATH/src/go-get-issue-9357.appspot.com
+go get go-get-issue-9357.appspot.com
+
+rm $GOPATH/src/go-get-issue-9357.appspot.com
+go get -u go-get-issue-9357.appspot.com
diff --git a/src/cmd/go/testdata/script/get_dot_slash_download.txt b/src/cmd/go/testdata/script/get_dot_slash_download.txt
new file mode 100644
index 0000000..6dbd118
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_dot_slash_download.txt
@@ -0,0 +1,10 @@
+[!net:rsc.io] skip
+[!git] skip
+env GO111MODULE=off
+
+# Tests Issues #9797 and #19769
+
+mkdir $WORK/tmp/src/rsc.io
+env GOPATH=$WORK/tmp
+cd $WORK/tmp/src/rsc.io
+go get ./pprof_mac_fix
diff --git a/src/cmd/go/testdata/script/get_dotfiles.txt b/src/cmd/go/testdata/script/get_dotfiles.txt
new file mode 100644
index 0000000..676a044
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_dotfiles.txt
@@ -0,0 +1,64 @@
+env GO111MODULE=off
+[short] skip
+
+[!git] skip
+
+# Set up a benign repository and a repository with a dotfile name.
+cd $WORK/_origin/foo
+exec git init
+exec git config user.name 'Nameless Gopher'
+exec git config user.email 'nobody@golang.org'
+exec git commit --allow-empty -m 'create master branch'
+
+cd $WORK/_origin/.hidden
+exec git init
+exec git config user.name 'Nameless Gopher'
+exec git config user.email 'nobody@golang.org'
+exec git commit --allow-empty -m 'create master branch'
+
+# Clone the empty repositories into GOPATH.
+# This tells the Go command where to find them: it takes the place of a user's meta-tag redirector.
+mkdir $GOPATH/src/example.com
+cd $GOPATH/src/example.com
+exec git clone $WORK/_origin/foo
+exec git clone $WORK/_origin/.hidden
+
+# Add a benign commit.
+cd $WORK/_origin/foo
+cp _ok/main.go main.go
+exec git add main.go
+exec git commit -m 'add ok'
+
+# 'go get' should install the benign commit.
+cd $GOPATH
+go get -u example.com/foo
+
+# Now sneak in an import of a dotfile path.
+cd $WORK/_origin/.hidden
+exec git add hidden.go
+exec git commit -m 'nothing to see here, move along'
+
+cd $WORK/_origin/foo
+cp _sneaky/main.go main.go
+exec git add main.go
+exec git commit -m 'fix typo (heh heh heh)'
+
+# 'go get -u' should refuse to download or update the dotfile-named repo.
+cd $GOPATH/src/example.com/foo
+! go get -u example.com/foo
+stderr 'leading dot'
+! exists example.com/.hidden/hidden.go
+
+-- $WORK/_origin/foo/_ok/main.go --
+package main
+
+func main() {}
+
+-- $WORK/_origin/foo/_sneaky/main.go --
+package main
+import _ "example.com/.hidden"
+
+func main() {}
+
+-- $WORK/_origin/.hidden/hidden.go --
+package hidden
diff --git a/src/cmd/go/testdata/script/get_go_file.txt b/src/cmd/go/testdata/script/get_go_file.txt
new file mode 100644
index 0000000..f6d0de4
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_go_file.txt
@@ -0,0 +1,60 @@
+# Tests Issue #38478
+# Tests that go get in GOPATH mode returns a specific error if the argument
+# ends with '.go', and either has no slash or refers to an existing file.
+
+env GO111MODULE=off
+
+# argument doesn't have .go suffix
+go get -d test
+
+# argument has .go suffix, is a file and exists
+! go get -d test.go
+stderr 'go: test.go: arguments must be package or module paths'
+
+# argument has .go suffix, doesn't exist and has no slashes
+! go get -d test_missing.go
+stderr 'go: test_missing.go: arguments must be package or module paths'
+
+# argument has .go suffix, is a file and exists in sub-directory
+! go get -d test/test.go
+stderr 'go: test/test.go exists as a file, but ''go get'' requires package arguments'
+
+# argument has .go suffix, doesn't exist and has slashes
+! go get -d test/test_missing.go
+! stderr 'arguments must be package or module paths'
+! stderr 'exists as a file, but ''go get'' requires package arguments'
+
+# argument has .go suffix, is a symlink and exists
+[symlink] symlink test_sym.go -> test.go
+[symlink] ! go get -d test_sym.go
+[symlink] stderr 'go: test_sym.go: arguments must be package or module paths'
+[symlink] rm test_sym.go
+
+# argument has .go suffix, is a symlink and exists in sub-directory
+[symlink] symlink test/test_sym.go -> test.go
+[symlink] ! go get -d test/test_sym.go
+[symlink] stderr 'go: test/test_sym.go exists as a file, but ''go get'' requires package arguments'
+[symlink] rm test_sym.go
+
+# argument has .go suffix, is a directory and exists
+mkdir test_dir.go
+! go get -d test_dir.go
+stderr 'go: test_dir.go: arguments must be package or module paths'
+rm test_dir.go
+
+# argument has .go suffix, is a directory and exists in sub-directory
+mkdir test/test_dir.go
+! go get -d test/test_dir.go
+! stderr 'arguments must be package or module paths'
+! stderr 'exists as a file, but ''go get'' requires package arguments'
+rm test/test_dir.go
+
+
+-- test.go --
+package main
+func main() {println("test")}
+
+
+-- test/test.go --
+package main
+func main() {println("test")}
diff --git a/src/cmd/go/testdata/script/get_goroot.txt b/src/cmd/go/testdata/script/get_goroot.txt
new file mode 100644
index 0000000..7510692
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_goroot.txt
@@ -0,0 +1,53 @@
+[!net:github.com] skip
+env GO111MODULE=off
+
+# Issue 4186. go get cannot be used to download packages to $GOROOT.
+# Test that without GOPATH set, go get should fail.
+
+# Fails because GOROOT=GOPATH
+env GOPATH=$WORK/tmp
+env GOROOT=$WORK/tmp
+! go get -d github.com/golang/example/hello
+stderr 'warning: GOPATH set to GOROOT'
+stderr '\$GOPATH must not be set to \$GOROOT'
+
+# Fails because GOROOT=GOPATH after cleaning.
+env GOPATH=$WORK/tmp/
+env GOROOT=$WORK/tmp
+! go get -d github.com/golang/example/hello
+stderr 'warning: GOPATH set to GOROOT'
+stderr '\$GOPATH must not be set to \$GOROOT'
+
+env GOPATH=$WORK/tmp
+env GOROOT=$WORK/tmp/
+! go get -d github.com/golang/example/hello
+stderr 'warning: GOPATH set to GOROOT'
+stderr '\$GOPATH must not be set to \$GOROOT'
+
+# Make a home directory
+mkdir $WORK/home/go
+
+# Fails because GOROOT=$HOME/go so default GOPATH unset.
+[GOOS:windows] env USERPROFILE=$WORK/home
+[GOOS:plan9] env home=$WORK/home
+[!GOOS:windows] [!GOOS:plan9] env HOME=$WORK/home
+env GOPATH=
+env GOROOT=$WORK/home/go
+! go get -d github.com/golang/example/hello
+stderr '\$GOPATH not set'
+
+[GOOS:windows] env USERPROFILE=$WORK/home/
+[GOOS:plan9] env home=$WORK/home/
+[!GOOS:windows] [!GOOS:plan9] env HOME=$WORK/home/
+env GOPATH=
+env GOROOT=$WORK/home/go
+! go get -d github.com/golang/example/hello
+stderr '\$GOPATH not set'
+
+[GOOS:windows] env USERPROFILE=$WORK/home
+[GOOS:plan9] env home=$WORK/home
+[!GOOS:windows] [!GOOS:plan9] env HOME=$WORK/home
+env GOPATH=
+env GOROOT=$WORK/home/go/
+! go get -d github.com/golang/example/hello
+stderr '\$GOPATH not set'
diff --git a/src/cmd/go/testdata/script/get_insecure.txt b/src/cmd/go/testdata/script/get_insecure.txt
index f29ec2d..afe64b8 100644
--- a/src/cmd/go/testdata/script/get_insecure.txt
+++ b/src/cmd/go/testdata/script/get_insecure.txt
@@ -1,9 +1,25 @@
+# TODO(matloob): Split this test into two? It's one of the slowest tests we have.
+
 [!net:insecure.go-get-issue-15410.appspot.com] skip
 [!git] skip
 
 env PATH=$WORK/tmp/bin${:}$PATH
 go build -o $WORK/tmp/bin/ssh ssh.go
 
+# GOPATH: Set up
+env GO111MODULE=off
+
+# GOPATH: Try go get -d of HTTP-only repo (should fail).
+! go get -d insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try again with GOINSECURE (should succeed).
+env GOINSECURE=insecure.go-get-issue-15410.appspot.com
+go get -d insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try updating without GOINSECURE (should fail).
+env GOINSECURE=''
+! go get -d -u -f insecure.go-get-issue-15410.appspot.com/pkg/p
+
 # Modules: Set up
 env GOPATH=$WORK/m/gp
 mkdir $WORK/m
diff --git a/src/cmd/go/testdata/script/get_insecure_custom_domain.txt b/src/cmd/go/testdata/script/get_insecure_custom_domain.txt
new file mode 100644
index 0000000..4b3c9d6
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_insecure_custom_domain.txt
@@ -0,0 +1,8 @@
+[!net:insecure.go-get-issue-15410.appspot.com] skip
+[!git] skip
+env GO111MODULE=off
+
+! go get -d insecure.go-get-issue-15410.appspot.com/pkg/p
+
+env GOINSECURE=insecure.go-get-issue-15410.appspot.com
+go get -d insecure.go-get-issue-15410.appspot.com/pkg/p
diff --git a/src/cmd/go/testdata/script/get_insecure_env.txt b/src/cmd/go/testdata/script/get_insecure_env.txt
new file mode 100644
index 0000000..98e7053
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_insecure_env.txt
@@ -0,0 +1,29 @@
+[!net:insecure.go-get-issue-15410.appspot.com] skip
+[!git] skip
+
+# GOPATH: Set up
+env GO111MODULE=off
+
+# GOPATH: Try go get -d of HTTP-only repo (should fail).
+! go get -d insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try again with invalid GOINSECURE (should fail).
+env GOINSECURE=insecure.go-get-issue-15410.appspot.com/pkg/q
+! go get -d insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try with correct GOINSECURE (should succeed).
+env GOINSECURE=insecure.go-get-issue-15410.appspot.com/pkg/p
+go get -d insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try updating without GOINSECURE (should fail).
+env GOINSECURE=
+! go get -d -u -f insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try updating with GOINSECURE glob (should succeed).
+env GOINSECURE=*.go-get-*.appspot.com
+go get -d -u -f insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try updating with GOINSECURE base URL (should succeed).
+env GOINSECURE=insecure.go-get-issue-15410.appspot.com
+go get -d -u -f insecure.go-get-issue-15410.appspot.com/pkg/p
+
diff --git a/src/cmd/go/testdata/script/get_insecure_redirect.txt b/src/cmd/go/testdata/script/get_insecure_redirect.txt
new file mode 100644
index 0000000..2e53c58
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_insecure_redirect.txt
@@ -0,0 +1,14 @@
+# golang.org/issue/29591: 'go get' was following plain-HTTP redirects even without -insecure (now replaced by GOINSECURE).
+# golang.org/issue/34049: 'go get' would panic in case of an insecure redirect in GOPATH mode
+
+[!git] skip
+
+env GO111MODULE=off
+
+! go get -d vcs-test.golang.org/insecure/go/insecure
+stderr 'redirected .* to insecure URL'
+
+[short] stop 'builds a git repo'
+
+env GOINSECURE=vcs-test.golang.org/insecure/go/insecure
+go get -d vcs-test.golang.org/insecure/go/insecure
diff --git a/src/cmd/go/testdata/script/get_insecure_update.txt b/src/cmd/go/testdata/script/get_insecure_update.txt
new file mode 100644
index 0000000..7cddd6b
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_insecure_update.txt
@@ -0,0 +1,14 @@
+[!net:github.com] skip
+[!git] skip
+env GO111MODULE=off
+
+# Clone the repo via HTTP manually.
+exec git clone -q http://github.com/golang/example github.com/golang/example
+
+# Update without GOINSECURE should fail.
+# We need -f to ignore import comments.
+! go get -d -u -f github.com/golang/example/hello
+
+# Update with GOINSECURE should succeed.
+env GOINSECURE=github.com/golang/example/hello
+go get -d -u -f github.com/golang/example/hello
diff --git a/src/cmd/go/testdata/script/get_internal_wildcard.txt b/src/cmd/go/testdata/script/get_internal_wildcard.txt
new file mode 100644
index 0000000..b25e746
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_internal_wildcard.txt
@@ -0,0 +1,6 @@
+[!net:github.com] skip
+[!git] skip
+env GO111MODULE=off
+
+# This used to fail with errors about internal packages
+go get github.com/rsc/go-get-issue-11960/...
diff --git a/src/cmd/go/testdata/script/get_issue11307.txt b/src/cmd/go/testdata/script/get_issue11307.txt
new file mode 100644
index 0000000..d490959
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_issue11307.txt
@@ -0,0 +1,9 @@
+# go get -u was not working except in checkout directory
+
+[!net:github.com] skip
+[!git] skip
+env GO111MODULE=off
+
+env GOPATH=$WORK/tmp/gopath
+go get github.com/rsc/go-get-issue-11307
+go get -u github.com/rsc/go-get-issue-11307 # was failing
diff --git a/src/cmd/go/testdata/script/get_issue16471.txt b/src/cmd/go/testdata/script/get_issue16471.txt
new file mode 100644
index 0000000..1aeae58
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_issue16471.txt
@@ -0,0 +1,23 @@
+[!net:rsc.io] skip
+[!net:github.com] skip
+[!git] skip
+
+env GO111MODULE=off
+
+cd rsc.io/go-get-issue-10952
+
+exec git init
+exec git add foo.go
+exec git config user.name Gopher
+exec git config user.email gopher@golang.org
+exec git commit -a -m 'initial commit'
+exec git remote add origin https://github.com/golang/go-get-issue-10952
+
+exec git status
+
+! go get -x -u rsc.io/go-get-issue-10952
+stderr '^package rsc.io/go-get-issue-10952: rsc\.io/go-get-issue-10952 is a custom import path for https://github.com/rsc/go-get-issue-10952, but .* is checked out from https://github.com/golang/go-get-issue-10952$'
+
+-- rsc.io/go-get-issue-10952/foo.go --
+// Junk package to test go get.
+package foo
diff --git a/src/cmd/go/testdata/script/get_issue22125.txt b/src/cmd/go/testdata/script/get_issue22125.txt
new file mode 100644
index 0000000..086081f
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_issue22125.txt
@@ -0,0 +1,14 @@
+# This test verifies a fix for a security issue; see https://go.dev/issue/22125.
+
+[short] skip
+[!git] skip
+[!exec:svn] skip
+
+env GO111MODULE=off
+
+cd $GOPATH
+! go get -u vcs-test.golang.org/go/test1-svn-git
+stderr 'src'${/}'vcs-test.* uses git, but parent .*src'${/}'vcs-test.* uses svn'
+
+[!case-sensitive] ! go get -u vcs-test.golang.org/go/test2-svn-git/test2main
+[!case-sensitive] stderr 'src'${/}'vcs-test.* uses git, but parent .*src'${/}'vcs-test.* uses svn'
diff --git a/src/cmd/go/testdata/script/get_legacy.txt b/src/cmd/go/testdata/script/get_legacy.txt
new file mode 100644
index 0000000..2909b73
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_legacy.txt
@@ -0,0 +1,58 @@
+# This test was converted from a test in vendor_test.go (which no longer exists).
+# That seems to imply that it's about vendoring semantics, but the test doesn't
+# use 'go -mod=vendor' (and none of the fetched repos have vendor folders).
+# The test still seems to be useful as a test of direct-mode go get.
+
+[short] skip
+[!git] skip
+env GO111MODULE=off
+
+env GOPATH=$WORK/tmp/d1
+go get vcs-test.golang.org/git/modlegacy1-old.git/p1
+go list -f '{{.Deps}}' vcs-test.golang.org/git/modlegacy1-old.git/p1
+stdout 'new.git/p2' # old/p1 should depend on new/p2
+! stdout new.git/v2/p2 # old/p1 should NOT depend on new/v2/p2
+go build vcs-test.golang.org/git/modlegacy1-old.git/p1 vcs-test.golang.org/git/modlegacy1-new.git/p1
+! stdout .
+
+env GOPATH=$WORK/tmp/d2
+
+rm $GOPATH
+go get github.com/rsc/vgotest5
+go get github.com/rsc/vgotest4
+go get github.com/myitcv/vgo_example_compat
+
+rm $GOPATH
+go get github.com/rsc/vgotest4
+go get github.com/rsc/vgotest5
+go get github.com/myitcv/vgo_example_compat
+
+rm $GOPATH
+go get github.com/rsc/vgotest4 github.com/rsc/vgotest5
+go get github.com/myitcv/vgo_example_compat
+
+rm $GOPATH
+go get github.com/rsc/vgotest5 github.com/rsc/vgotest4
+go get github.com/myitcv/vgo_example_compat
+
+rm $GOPATH
+go get github.com/myitcv/vgo_example_compat
+go get github.com/rsc/vgotest5 github.com/rsc/vgotest4
+
+rm $GOPATH
+go get github.com/myitcv/vgo_example_compat github.com/rsc/vgotest4 github.com/rsc/vgotest5
+
+rm $GOPATH
+go get github.com/myitcv/vgo_example_compat github.com/rsc/vgotest5 github.com/rsc/vgotest4
+
+rm $GOPATH
+go get github.com/rsc/vgotest4 github.com/myitcv/vgo_example_compat github.com/rsc/vgotest5
+
+rm $GOPATH
+go get github.com/rsc/vgotest4 github.com/rsc/vgotest5 github.com/myitcv/vgo_example_compat
+
+rm $GOPATH
+go get github.com/rsc/vgotest5 github.com/myitcv/vgo_example_compat github.com/rsc/vgotest4
+
+rm $GOPATH
+go get github.com/rsc/vgotest5 github.com/rsc/vgotest4 github.com/myitcv/vgo_example_compat
diff --git a/src/cmd/go/testdata/script/get_non_pkg.txt b/src/cmd/go/testdata/script/get_non_pkg.txt
new file mode 100644
index 0000000..5202e88
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_non_pkg.txt
@@ -0,0 +1,14 @@
+[!net:golang.org] skip
+[!git] skip
+
+env GOBIN=$WORK/tmp/gobin
+env GO111MODULE=off
+
+! go get -d golang.org/x/tools
+stderr 'golang.org/x/tools: no Go files'
+
+! go get -d -u golang.org/x/tools
+stderr 'golang.org/x/tools: no Go files'
+
+! go get -d golang.org/x/tools
+stderr 'golang.org/x/tools: no Go files'
diff --git a/src/cmd/go/testdata/script/get_race.txt b/src/cmd/go/testdata/script/get_race.txt
new file mode 100644
index 0000000..1e06c80
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_race.txt
@@ -0,0 +1,8 @@
+# Tests issue #20502
+
+[!net:github.com] skip
+[!git] skip
+[!race] skip
+env GO111MODULE=off
+
+go get -race github.com/rsc/go-get-issue-9224-cmd
diff --git a/src/cmd/go/testdata/script/get_test_only.txt b/src/cmd/go/testdata/script/get_test_only.txt
new file mode 100644
index 0000000..af90f74
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_test_only.txt
@@ -0,0 +1,6 @@
+[!net:golang.org] skip
+[!git] skip
+env GO111MODULE=off
+
+go get golang.org/x/tour/content...
+go get -t golang.org/x/tour/content...
diff --git a/src/cmd/go/testdata/script/get_tilde.txt b/src/cmd/go/testdata/script/get_tilde.txt
new file mode 100644
index 0000000..1c3a029
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_tilde.txt
@@ -0,0 +1,25 @@
+env GO111MODULE=off
+
+# Paths containing windows short names should be rejected before attempting to fetch.
+! go get vcs-test.golang.org/longna~1.dir/thing
+stderr 'trailing tilde and digits'
+! go get vcs-test.golang.org/longna~1/thing
+stderr 'trailing tilde and digits'
+! go get vcs-test.golang.org/~9999999/thing
+stderr 'trailing tilde and digits'
+
+[short] stop
+
+# A path containing an element that is just a tilde, or a tilde followed by non-digits,
+# should attempt to resolve.
+! go get vcs-test.golang.org/~glenda/notfound
+! stderr 'trailing tilde and digits'
+stderr 'unrecognized import path'
+
+! go get vcs-test.golang.org/~glenda2/notfound
+! stderr 'trailing tilde and digits'
+stderr 'unrecognized import path'
+
+! go get vcs-test.golang.org/~/notfound
+! stderr 'trailing tilde and digits'
+stderr 'unrecognized import path'
diff --git a/src/cmd/go/testdata/script/get_update.txt b/src/cmd/go/testdata/script/get_update.txt
new file mode 100644
index 0000000..a70a80d
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_update.txt
@@ -0,0 +1,25 @@
+# Tests Issue #9224
+# The recursive updating was trying to walk to
+# former dependencies, not current ones.
+
+[!net:github.com] skip
+[!git] skip
+env GO111MODULE=off
+
+# Rewind
+go get github.com/rsc/go-get-issue-9224-cmd
+cd $GOPATH/src/github.com/rsc/go-get-issue-9224-lib
+exec git reset --hard HEAD~
+cd $GOPATH/src
+
+# Run get
+go get -u 'github.com/rsc/go-get-issue-9224-cmd'
+
+# (Again with -d -u) Rewind
+go get github.com/rsc/go-get-issue-9224-cmd
+cd $GOPATH/src/github.com/rsc/go-get-issue-9224-lib
+exec git reset --hard HEAD~
+cd $GOPATH/src
+
+# (Again with -d -u) Run get
+go get -d -u 'github.com/rsc/go-get-issue-9224-cmd'
diff --git a/src/cmd/go/testdata/script/get_update_all.txt b/src/cmd/go/testdata/script/get_update_all.txt
new file mode 100644
index 0000000..22fe3ed
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_update_all.txt
@@ -0,0 +1,7 @@
+# Issue 14444: go get -u .../ duplicate loads errors
+# Check that go get update -u ... does not try to load duplicates
+
+env GO111MODULE=off
+
+go get -u -n .../
+! stderr 'duplicate loads of' # make sure old packages are removed from cache
diff --git a/src/cmd/go/testdata/script/get_update_unknown_protocol.txt b/src/cmd/go/testdata/script/get_update_unknown_protocol.txt
new file mode 100644
index 0000000..714ed6a
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_update_unknown_protocol.txt
@@ -0,0 +1,14 @@
+[!net:github.com] skip
+[!git] skip
+env GO111MODULE=off
+
+# Clone the repo via HTTPS manually.
+exec git clone -q https://github.com/golang/example github.com/golang/example
+
+# Configure the repo to use a protocol unknown to cmd/go
+# that still actually works.
+cd github.com/golang/example
+exec git remote set-url origin xyz://github.com/golang/example
+exec git config --local url.https://github.com/.insteadOf xyz://github.com/
+
+go get -d -u -f github.com/golang/example/hello
diff --git a/src/cmd/go/testdata/script/get_update_wildcard.txt b/src/cmd/go/testdata/script/get_update_wildcard.txt
new file mode 100644
index 0000000..c833783
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_update_wildcard.txt
@@ -0,0 +1,16 @@
+# Issue 14450: go get -u .../ tried to import not downloaded package
+
+[!net:github.com] skip
+[!git] skip
+env GO111MODULE=off
+
+go get github.com/tmwh/go-get-issue-14450/a
+! go get -u .../
+stderr 'cannot find package.*d-dependency/e'
+
+# Even though get -u failed, the source for others should be downloaded.
+exists github.com/tmwh/go-get-issue-14450/b
+exists github.com/tmwh/go-get-issue-14450-b-dependency/c
+exists github.com/tmwh/go-get-issue-14450-b-dependency/d
+
+! exists github.com/tmwh/go-get-issue-14450-c-dependency/e
diff --git a/src/cmd/go/testdata/script/get_vcs_error_message.txt b/src/cmd/go/testdata/script/get_vcs_error_message.txt
new file mode 100644
index 0000000..8dc84fc
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_vcs_error_message.txt
@@ -0,0 +1,9 @@
+# Test that the Version Control error message includes the correct directory
+env GO111MODULE=off
+! go get -u foo
+stderr gopath(\\\\|/)src(\\\\|/)foo
+
+-- foo/foo.go --
+package foo
+-- math/math.go --
+package math
diff --git a/src/cmd/go/testdata/script/get_vendor.txt b/src/cmd/go/testdata/script/get_vendor.txt
new file mode 100644
index 0000000..179456d
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_vendor.txt
@@ -0,0 +1,95 @@
+[short] skip
+env GO111MODULE=off
+
+cd $GOPATH/src/v
+go run m.go
+go test
+go list -f '{{.Imports}}'
+stdout 'v/vendor/vendor.org/p'
+go list -f '{{.TestImports}}'
+stdout 'v/vendor/vendor.org/p'
+go get -d
+go get -t -d
+
+[!net:github.com] stop
+[!git] stop
+
+cd $GOPATH/src
+
+# Update
+go get 'github.com/rsc/go-get-issue-11864'
+go get -u 'github.com/rsc/go-get-issue-11864'
+exists github.com/rsc/go-get-issue-11864/vendor
+
+# get -u
+rm $GOPATH
+mkdir $GOPATH/src
+go get -u 'github.com/rsc/go-get-issue-11864'
+exists github.com/rsc/go-get-issue-11864/vendor
+
+# get -t -u
+rm $GOPATH
+mkdir $GOPATH/src
+go get -t -u 'github.com/rsc/go-get-issue-11864/...'
+exists github.com/rsc/go-get-issue-11864/vendor
+
+# Submodules
+rm $GOPATH
+mkdir $GOPATH/src
+go get -d 'github.com/rsc/go-get-issue-12612'
+go get -u -d 'github.com/rsc/go-get-issue-12612'
+exists github.com/rsc/go-get-issue-12612/vendor/golang.org/x/crypto/.git
+
+# Bad vendor (bad/imp)
+rm $GOPATH
+mkdir $GOPATH/src
+! go get -t -u 'github.com/rsc/go-get-issue-18219/bad/imp'
+stderr 'must be imported as'
+! exists github.com/rsc/go-get-issue-11864/vendor
+
+# Bad vendor (bad/imp2)
+rm $GOPATH
+mkdir $GOPATH/src
+! go get -t -u 'github.com/rsc/go-get-issue-18219/bad/imp2'
+stderr 'must be imported as'
+! exists github.com/rsc/go-get-issue-11864/vendor
+
+# Bad vendor (bad/imp3)
+rm $GOPATH
+mkdir $GOPATH/src
+! go get -t -u 'github.com/rsc/go-get-issue-18219/bad/imp3'
+stderr 'must be imported as'
+! exists github.com/rsc/go-get-issue-11864/vendor
+
+# Bad vendor (bad/...)
+rm $GOPATH
+mkdir $GOPATH/src
+! go get -t -u 'github.com/rsc/go-get-issue-18219/bad/...'
+stderr 'must be imported as'
+! exists github.com/rsc/go-get-issue-11864/vendor
+
+-- v/m.go --
+package main
+
+import (
+	"fmt"
+	"vendor.org/p"
+)
+
+func main() {
+	fmt.Println(p.C)
+}
+-- v/m_test.go --
+package main
+import (
+	"fmt"
+	"testing"
+	"vendor.org/p"
+)
+
+func TestNothing(t *testing.T) {
+	fmt.Println(p.C)
+}
+-- v/vendor/vendor.org/p/p.go --
+package p
+const C = 1
diff --git a/src/cmd/go/testdata/script/get_with_git_trace.txt b/src/cmd/go/testdata/script/get_with_git_trace.txt
new file mode 100644
index 0000000..6f1305a
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_with_git_trace.txt
@@ -0,0 +1,9 @@
+env GO111MODULE=off
+
+env GIT_TRACE=1
+
+[!net:golang.org] skip
+[!git] skip
+
+# go get should be success when GIT_TRACE set
+go get golang.org/x/text
diff --git a/src/cmd/go/testdata/script/gopath_moved_repo.txt b/src/cmd/go/testdata/script/gopath_moved_repo.txt
new file mode 100644
index 0000000..8108d9b
--- /dev/null
+++ b/src/cmd/go/testdata/script/gopath_moved_repo.txt
@@ -0,0 +1,67 @@
+env GO111MODULE=off
+
+# Test that 'go get -u' reports packages whose VCS configurations do not
+# match their import paths.
+
+[!net:rsc.io] skip
+[short] skip
+
+# We need to execute a custom Go program to break the config files.
+#
+# git will ask for a username and password when we run 'go get -d -f -u',
+# so we also need to set GIT_ASKPASS. Conveniently, a single binary can
+# perform both tasks!
+
+go build -o replace.exe replace
+env GIT_ASKPASS=$PWD/replace.exe
+
+
+# Test that 'go get -u' reports moved git packages.
+
+[git] go get -d rsc.io/pdf
+[git] go get -d -u rsc.io/pdf
+[git] exec ./replace.exe pdf rsc.io/pdf/.git/config
+
+[git] ! go get -d -u rsc.io/pdf
+[git] stderr 'is a custom import path for'
+[git] ! go get -d -f -u rsc.io/pdf
+[git] stderr 'validating server certificate|[nN]ot [fF]ound'
+
+
+# Test that 'go get -u' reports moved Mercurial packages.
+
+[exec:hg] go get -d vcs-test.golang.org/go/custom-hg-hello
+[exec:hg] go get -d -u vcs-test.golang.org/go/custom-hg-hello
+[exec:hg] exec ./replace.exe custom-hg-hello vcs-test.golang.org/go/custom-hg-hello/.hg/hgrc
+
+[exec:hg] ! go get -d -u vcs-test.golang.org/go/custom-hg-hello
+[exec:hg] stderr 'is a custom import path for'
+[exec:hg] ! go get -d -f -u vcs-test.golang.org/go/custom-hg-hello
+[exec:hg] stderr 'validating server certificate|[nN]ot [fF]ound'
+
+
+-- replace/replace.go --
+package main
+
+import (
+	"bytes"
+	"log"
+	"os"
+)
+
+func main() {
+	if len(os.Args) < 3 {
+		return
+	}
+
+	base := []byte(os.Args[1])
+	path := os.Args[2]
+	data, err := os.ReadFile(path)
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = os.WriteFile(path, bytes.ReplaceAll(data, base, append(base, "XXX"...)), 0644)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/src/cmd/go/testdata/script/govcs.txt b/src/cmd/go/testdata/script/govcs.txt
index 876f606..dd128cc 100644
--- a/src/cmd/go/testdata/script/govcs.txt
+++ b/src/cmd/go/testdata/script/govcs.txt
@@ -84,6 +84,89 @@ env GOVCS=public:git
 ! go get rsc.io/nonexist.hg/hello
 stderr '^go: rsc.io/nonexist.hg/hello: GOVCS disallows using hg for public rsc.io/nonexist.hg; see ''go help vcs''$'
 
+# Repeat in GOPATH mode. Error texts slightly different.
+
+env GO111MODULE=off
+
+# GOVCS stops go get
+env GOVCS='*:none'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'
+env GOPRIVATE='github.com/google'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: GOVCS disallows using git for private github.com/google/go-cmp; see ''go help vcs''$'
+
+# public pattern works
+env GOPRIVATE='github.com/google'
+env GOVCS='public:all,private:none'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: GOVCS disallows using git for private github.com/google/go-cmp; see ''go help vcs''$'
+
+# private pattern works
+env GOPRIVATE='hubgit.com/google'
+env GOVCS='private:all,public:none'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'
+
+# other patterns work (for more patterns, see TestGOVCS)
+env GOPRIVATE=
+env GOVCS='github.com:svn|hg'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'
+env GOVCS='github.com/google/go-cmp/inner:git,github.com:svn|hg'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'
+
+# bad patterns are reported (for more bad patterns, see TestGOVCSErrors)
+env GOVCS='git'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: malformed entry in GOVCS \(missing colon\): "git"$'
+
+env GOVCS=github.com:hg,github.com:git
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: unreachable pattern in GOVCS: "github.com:git" after "github.com:hg"$'
+
+# bad GOVCS patterns do not stop commands that do not need to check VCS
+go list
+
+# svn is disallowed by default
+env GOPRIVATE=
+env GOVCS=
+! go get rsc.io/nonexist.svn/hello
+stderr '^package rsc.io/nonexist.svn/hello: GOVCS disallows using svn for public rsc.io/nonexist.svn; see ''go help vcs''$'
+
+# fossil is disallowed by default
+env GOPRIVATE=
+env GOVCS=
+! go get rsc.io/nonexist.fossil/hello
+stderr '^package rsc.io/nonexist.fossil/hello: GOVCS disallows using fossil for public rsc.io/nonexist.fossil; see ''go help vcs''$'
+
+# bzr is disallowed by default
+env GOPRIVATE=
+env GOVCS=
+! go get rsc.io/nonexist.bzr/hello
+stderr '^package rsc.io/nonexist.bzr/hello: GOVCS disallows using bzr for public rsc.io/nonexist.bzr; see ''go help vcs''$'
+
+# git is OK by default
+env GOVCS=
+env GONOSUMDB='*'
+[net:rsc.io] [git] [!short] go get rsc.io/sampler
+
+# hg is OK by default
+env GOVCS=
+env GONOSUMDB='*'
+[exec:hg] [!short] go get vcs-test.golang.org/go/custom-hg-hello
+
+# git can be disallowed
+env GOVCS=public:hg
+! go get rsc.io/nonexist.git/hello
+stderr '^package rsc.io/nonexist.git/hello: GOVCS disallows using git for public rsc.io/nonexist.git; see ''go help vcs''$'
+
+# hg can be disallowed
+env GOVCS=public:git
+! go get rsc.io/nonexist.hg/hello
+stderr '^package rsc.io/nonexist.hg/hello: GOVCS disallows using hg for public rsc.io/nonexist.hg; see ''go help vcs''$'
+
 -- go.mod --
 module m
 
diff --git a/src/cmd/go/testdata/script/help.txt b/src/cmd/go/testdata/script/help.txt
index fb15e93..26a0194 100644
--- a/src/cmd/go/testdata/script/help.txt
+++ b/src/cmd/go/testdata/script/help.txt
@@ -48,4 +48,4 @@ stderr 'Run ''go help test'' and ''go help testflag'' for details.'
 # go help get shows usage for get
 go help get
 stdout 'usage: go get'
-stdout 'specific module versions'
+stdout 'get when using GOPATH'
diff --git a/src/cmd/go/testdata/script/mod_versions.txt b/src/cmd/go/testdata/script/mod_versions.txt
index aaa4216..9e6322b 100644
--- a/src/cmd/go/testdata/script/mod_versions.txt
+++ b/src/cmd/go/testdata/script/mod_versions.txt
@@ -1,7 +1,7 @@
 # Test rejection of pkg@version in GOPATH mode.
 env GO111MODULE=off
 ! go get rsc.io/quote@v1.5.1
-stderr '^go: modules disabled by GO111MODULE=off'
+stderr '^go: can only use path@version syntax with ''go get'' and ''go install'' in module-aware mode$'
 ! go build rsc.io/quote@v1.5.1
 stderr '^package rsc.io/quote@v1.5.1: can only use path@version syntax with ''go get'' and ''go install'' in module-aware mode$'
 
diff --git a/src/cmd/go/testdata/script/vendor_list_issue11977.txt b/src/cmd/go/testdata/script/vendor_list_issue11977.txt
index f1ed613..f519175 100644
--- a/src/cmd/go/testdata/script/vendor_list_issue11977.txt
+++ b/src/cmd/go/testdata/script/vendor_list_issue11977.txt
@@ -1,5 +1,9 @@
+[!net:github.com] skip
+[!git] skip
 env GO111MODULE=off
 
+go get github.com/rsc/go-get-issue-11864
+
 go list -f '{{join .TestImports "\n"}}' github.com/rsc/go-get-issue-11864/t
 stdout 'go-get-issue-11864/vendor/vendor.org/p'
 
@@ -11,77 +15,3 @@ stdout 'go-get-issue-11864/vendor/vendor.org/tx2'
 
 go list -f '{{join .XTestImports "\n"}}' github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx3
 stdout 'go-get-issue-11864/vendor/vendor.org/tx3'
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/m.go --
-package g
-
-import _ "vendor.org/p"
-import _ "vendor.org/p1"
-
-func main() {}
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/t/t_test.go --
-package t
-
-import _ "vendor.org/p"
-import _ "vendor.org/p1"
-import "testing"
-
-func TestNop(t *testing.T) {}
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/t/t.go --
-package t
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/tx/tx_test.go --
-package tx_test
-
-import _ "vendor.org/p"
-import _ "vendor.org/p1"
-import "testing"
-
-func TestNop(t *testing.T) {}
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/tx/tx.go --
-package tx
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/p1/p1.go --
-package p1 // import "vendor.org/p1"
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx3/tx3_test.go --
-package tx3_test
-
-import "vendor.org/tx3"
-import "testing"
-
-var Found = tx3.Exported
-
-func TestNop(t *testing.T) {}
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx3/export_test.go --
-package tx3
-
-var Exported = true
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx3/tx3.go --
-package tx3
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx2/tx2_test.go --
-package tx2_test
-
-import . "vendor.org/tx2"
-import "testing"
-
-var Found = Exported
-
-func TestNop(t *testing.T) {}
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx2/export_test.go --
-package tx2
-
-var Exported = true
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx2/tx2.go --
-package tx2
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/p/p.go --
-package p
diff --git a/src/cmd/go/testdata/script/vendor_test_issue11864.txt b/src/cmd/go/testdata/script/vendor_test_issue11864.txt
index 90c9c59..9e34811 100644
--- a/src/cmd/go/testdata/script/vendor_test_issue11864.txt
+++ b/src/cmd/go/testdata/script/vendor_test_issue11864.txt
@@ -1,83 +1,12 @@
-[short] skip
+[!net:github.com] skip
+[!git] skip
 env GO111MODULE=off
 
+go get github.com/rsc/go-get-issue-11864
+
 # test should work too
 go test github.com/rsc/go-get-issue-11864
 go test github.com/rsc/go-get-issue-11864/t
 
 # external tests should observe internal test exports (golang.org/issue/11977)
 go test github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx2
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/m.go --
-package g
-
-import _ "vendor.org/p"
-import _ "vendor.org/p1"
-
-func main() {}
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/t/t_test.go --
-package t
-
-import _ "vendor.org/p"
-import _ "vendor.org/p1"
-import "testing"
-
-func TestNop(t *testing.T) {}
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/t/t.go --
-package t
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/tx/tx_test.go --
-package tx_test
-
-import _ "vendor.org/p"
-import _ "vendor.org/p1"
-import "testing"
-
-func TestNop(t *testing.T) {}
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/tx/tx.go --
-package tx
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/p1/p1.go --
-package p1 // import "vendor.org/p1"
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx3/tx3_test.go --
-package tx3_test
-
-import "vendor.org/tx3"
-import "testing"
-
-var Found = tx3.Exported
-
-func TestNop(t *testing.T) {}
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx3/export_test.go --
-package tx3
-
-var Exported = true
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx3/tx3.go --
-package tx3
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx2/tx2_test.go --
-package tx2_test
-
-import . "vendor.org/tx2"
-import "testing"
-
-var Found = Exported
-
-func TestNop(t *testing.T) {}
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx2/export_test.go --
-package tx2
-
-var Exported = true
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx2/tx2.go --
-package tx2
-
--- $GOPATH/src/github.com/rsc/go-get-issue-11864/vendor/vendor.org/p/p.go --
-package p
diff --git a/src/cmd/go/testdata/script/vendor_test_issue14613.txt b/src/cmd/go/testdata/script/vendor_test_issue14613.txt
index d2f05c9..9535fc1 100644
--- a/src/cmd/go/testdata/script/vendor_test_issue14613.txt
+++ b/src/cmd/go/testdata/script/vendor_test_issue14613.txt
@@ -1,6 +1,11 @@
-[short] skip
+[!net:github.com] skip
+[!git] skip
 env GO111MODULE=off
 
+cd $GOPATH
+
+go get github.com/clsung/go-vendor-issue-14613
+
 # test folder should work
 go test github.com/clsung/go-vendor-issue-14613
 
@@ -11,42 +16,3 @@ go test github.com/clsung/go-vendor-issue-14613/vendor_test.go
 # test with imported and not used
 ! go test github.com/clsung/go-vendor-issue-14613/vendor/mylibtesttest/myapp/myapp_test.go
 stderr 'imported and not used'
-
--- $GOPATH/src/github.com/clsung/go-vendor-issue-14613/./vendor_test.go --
-package main
-
-import (
-	"testing"
-
-	"github.com/clsung/fake"
-)
-
-func TestVendor(t *testing.T) {
-	ret := fake.DoNothing()
-	expected := "Ok"
-	if expected != ret {
-		t.Errorf("fake returned %q, expected %q", ret, expected)
-	}
-}
-
--- $GOPATH/src/github.com/clsung/go-vendor-issue-14613/./vendor/mylibtesttest/myapp/myapp_test.go --
-package myapp
-import (
-   "mylibtesttest/rds"
-)
-
--- $GOPATH/src/github.com/clsung/go-vendor-issue-14613/./vendor/mylibtesttest/rds/rds.go --
-package rds
-
--- $GOPATH/src/github.com/clsung/go-vendor-issue-14613/./vendor/github.com/clsung/fake/fake.go --
-package fake
-
-func DoNothing() string {
-	return "Ok"
-}
-
--- $GOPATH/src/github.com/clsung/go-vendor-issue-14613/./m.go --
-package main
-
-func main() {}
-
-- 
2.47.0