// Copyright 2020 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 fs_test

import (
	. "io/fs"
	"os"
	pathpkg "path"
	"path/filepath"
	"reflect"
	"testing"
	"testing/fstest"
)

type Node struct {
	name    string
	entries []*Node // nil if the entry is a file
	mark    int
}

var tree = &Node{
	"testdata",

	}
	return b, nil
}

func (p *proxyRepo) getBody(ctx context.Context, path string) (r io.ReadCloser, redactedURL string, err error) {
	fullPath := pathpkg.Join(p.url.Path, path)

	target := *p.url
	target.Path = fullPath
	target.RawPath = pathpkg.Join(target.RawPath, pathEscape(path))

	resp, err := web.Get(web.DefaultSecurity, &target)
	if err != nil {
		return nil, "", err
	}

func (p *Package) exeFromImportPath() string {
	_, elem := pathpkg.Split(p.ImportPath)
	if cfg.ModulesEnabled {
		// If this is example.com/mycmd/v2, it's more useful to
		// install it as mycmd than as v2. See golang.org/issue/24667.
		if elem != p.ImportPath && isVersionElement(elem) {
			_, elem = pathpkg.Split(pathpkg.Dir(p.ImportPath))
		}
	}
	return elem
}

// allows for virtual overlays on top of the files on disk.
package fsys

import (
	"encoding/json"
	"errors"
	"fmt"
	"internal/godebug"
	"io"
	"io/fs"
	"log"
	"os"
	pathpkg "path"
	"path/filepath"
	"runtime"
	"runtime/debug"
	"sort"
	"strings"
	"sync"
	"time"
)

// Trace emits a trace event for the operation and file path to the trace log,

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package modload

import (
	"context"
	"errors"
	"fmt"
	"go/build"
	"io/fs"
	"os"
	pathpkg "path"
	"path/filepath"
	"sort"
	"strings"

	"cmd/go/internal/cfg"
	"cmd/go/internal/fsys"
	"cmd/go/internal/gover"
	"cmd/go/internal/modfetch"
	"cmd/go/internal/modindex"
	"cmd/go/internal/par"

// if those packages are not found in existing dependencies of the main module.

import (
	"context"
	"errors"
	"fmt"
	"go/build"
	"internal/diff"
	"io/fs"
	"maps"
	"os"
	"path"
	pathpkg "path"
	"path/filepath"
	"runtime"
	"slices"
	"sort"
	"strings"
	"sync"
	"sync/atomic"

	"cmd/go/internal/base"
	"cmd/go/internal/cfg"
	"cmd/go/internal/fsys"
	"cmd/go/internal/gover"

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package modload

import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io/fs"
	"os"
	pathpkg "path"
	"slices"
	"sort"
	"strings"
	"sync"
	"time"

	"cmd/go/internal/cfg"
	"cmd/go/internal/gover"
	"cmd/go/internal/imports"
	"cmd/go/internal/modfetch"
	"cmd/go/internal/modfetch/codehost"

	"go/ast"
	"go/build/constraint"
	"go/doc"
	"go/token"
	"internal/buildcfg"
	"internal/godebug"
	"internal/goroot"
	"internal/goversion"
	"internal/platform"
	"io"
	"io/fs"
	"os"
	"os/exec"
	pathpkg "path"
	"path/filepath"
	"runtime"
	"slices"
	"strconv"
	"strings"
	"unicode"
	"unicode/utf8"
	_ "unsafe" // for linkname
)

// A Context specifies the supporting context for a build.

	if path == "" {
		return EINVAL
	}
	dirFd, pathPtr, pathLen := preparePath(path)
	errno := path_unlink_file(dirFd, pathPtr, pathLen)
	return errnoErr(errno)
}

func Rmdir(path string) error {
	if path == "" {
		return EINVAL
	}
	dirFd, pathPtr, pathLen := preparePath(path)
	errno := path_remove_directory(dirFd, pathPtr, pathLen)
	return errnoErr(errno)
}

	// Make sure we recognize the situation and report an error.

	mathPkg := types.NewPackage("math", "math") // incomplete package
	importer := New(&build.Default, token.NewFileSet(), map[string]*types.Package{mathPkg.Path(): mathPkg})
	_, err := importer.ImportFrom("math", ".", 0)
	if err == nil || !strings.HasPrefix(err.Error(), "reimport") {